# lua-resty-openssl **Repository Path**: mirrors_GUI/lua-resty-openssl ## Basic Information - **Project Name**: lua-resty-openssl - **Description**: FFI-based OpenSSL binding for OpenResty - **Primary Language**: Unknown - **License**: BSD-2-Clause - **Default Branch**: master - **Homepage**: None - **GVP Project**: No ## Statistics - **Stars**: 0 - **Forks**: 0 - **Created**: 2025-02-16 - **Last Updated**: 2026-01-10 ## Categories & Tags **Categories**: Uncategorized **Tags**: None ## README # lua-resty-openssl FFI-based OpenSSL binding for LuaJIT, supporting OpenSSL 3.x, 1.1 series. OpenSSL 1.1.0, 1.0.2 and BoringSSL support has been dropped, but are still available at the [0.x branch](https://github.com/fffonion/lua-resty-openssl/tree/0.x). ![Build Status](https://github.com/fffonion/lua-resty-openssl/workflows/Tests/badge.svg) ![luarocks](https://img.shields.io/luarocks/v/fffonion/lua-resty-openssl?color=%232c3e67) ![opm](https://img.shields.io/opm/v/fffonion/lua-resty-openssl?color=%23599059) Table of Contents ================= - [Description](#description) - [Status](#status) - [Synopsis](#synopsis) * [resty.openssl](#restyopenssl) + [openssl.load_library](#opensslload_library) + [openssl.load_modules](#opensslload_modules) + [openssl.luaossl_compat](#opensslluaossl_compat) + [openssl.resty_hmac_compat](#opensslresty_hmac_compat) + [openssl.get_fips_mode](#opensslget_fips_mode) + [openssl.set_fips_mode](#opensslset_fips_mode) + [openssl.get_fips_version_text](#opensslget_fips_version_text) + [openssl.set_default_properties](#opensslset_default_properties) + [openssl.list_cipher_algorithms](#openssllist_cipher_algorithms) + [openssl.list_digest_algorithms](#openssllist_digest_algorithms) + [openssl.list_mac_algorithms](#openssllist_mac_algorithms) + [openssl.list_kdf_algorithms](#openssllist_kdf_algorithms) + [openssl.list_ssl_ciphers](#openssllist_ssl_ciphers) * [resty.openssl.ctx](#restyopensslctx) + [ctx.new](#ctxnew) + [ctx.free](#ctxfree) * [resty.openssl.err](#restyopensslerr) + [err.format_error](#errformat_error) + [err.get_last_error_code](#errget_last_error_code) + [err.get_lib_error_string](#errget_lib_error_string) + [err.get_reason_error_string](#errget_reason_error_string) * [resty.openssl.version](#restyopensslversion) + [version_num](#version_num) + [version_text](#version_text) + [version.version](#versionversion) + [version.info](#versioninfo) + [version.OPENSSL_3X](#versionOPENSSL_3X) + [version.OPENSSL_111](#versionopenssl_111) * [resty.openssl.provider](#restyopensslprovider) + [provider.load](#providerload) + [provider.istype](#provideristype) + [provider.is_available](#provideris_available) + [provider.set_default_search_path](#providerset_default_search_path) + [provider:unload](#providerunload) + [provider:self_test](#providerself_test) + [provider:get_params](#providerget_params) * [resty.openssl.pkey](#restyopensslpkey) + [pkey.new](#pkeynew) + [pkey.istype](#pkeyistype) + [pkey.paramgen](#pkeyparamgen) + [pkey:get_provider_name](#pkeyget_provider_name) + [pkey:gettable_params, pkey:settable_params, pkey:get_param, pkey:set_params](#pkeygettable_params-pkeysettable_params-pkeyget_param-pkeyset_params) + [pkey:get_parameters](#pkeyget_parameters) + [pkey:set_parameters](#pkeyset_parameters) + [pkey:is_private](#pkeyis_private) + [pkey:get_key_type](#pkeyget_key_type) + [pkey:get_default_digest_type](#pkeyget_default_digest_type) + [pkey:sign](#pkeysign) + [pkey:verify](#pkeyverify) + [pkey:encrypt](#pkeyencrypt) + [pkey:decrypt](#pkeydecrypt) + [pkey:sign_raw](#pkeysign_raw) + [pkey:verify_raw](#pkeyverify_raw) + [pkey:verify_recover](#pkeyverify_recover) + [pkey:derive](#pkeyderive) + [pkey:tostring](#pkeytostring) + [pkey:to_PEM](#pkeyto_pem) * [resty.openssl.bn](#restyopensslbn) + [bn.new](#bnnew) + [bn.dup](#bndup) + [bn.istype](#bnistype) + [bn:set](#bnset) + [bn.from_binary, bn:to_binary](#bnfrom_binary-bnto_binary) + [bn.from_mpi, bn:to_mpi](#bnfrom_mpi-bnto_mpi) + [bn.from_hex, bn:to_hex](#bnfrom_hex-bnto_hex) + [bn.from_dec, bn:to_dec](#bnfrom_dec-bnto_dec) + [bn:to_number](#bnto_number) + [bn:__metamethods](#bn__metamethods) + [bn:add, bn:sub, bn:mul, bn:div, bn:exp, bn:mod, bn:gcd](#bnadd-bnsub-bnmul-bndiv-bnexp-bnmod-bngcd) + [bn:sqr](#bnsqr) + [bn:mod_add, bn:mod_sub, bn:mod_mul, bn:mod_exp](#bnmod_add-bnmod_sub-bnmod_mul-bnmod_exp) + [bn:mod_sqr](#bnmod_sqr) + [bn:lshift, bn:rshift](#bnlshift-bnrshift) + [bn:is_zero, bn:is_one, bn:is_odd, bn:is_word](#bnis_zero-bnis_one-bnis_odd-bnis_word) + [bn:is_prime](#bnis_prime) * [resty.openssl.cipher](#restyopensslcipher) + [cipher.new](#ciphernew) + [cipher.istype](#cipheristype) + [cipher.set_buffer_size](#cipherset_buffer_size) + [cipher:get_provider_name](#cipherget_provider_name) + [cipher:gettable_params, cipher:settable_params, cipher:get_param, cipher:set_params](#ciphergettable_params-ciphersettable_params-cipherget_param-cipherset_params) + [cipher:encrypt](#cipherencrypt) + [cipher:decrypt](#cipherdecrypt) + [cipher:init](#cipherinit) + [cipher:update](#cipherupdate) + [cipher:update_aead_aad](#cipherupdate_aead_aad) + [cipher:get_aead_tag](#cipherget_aead_tag) + [cipher:set_aead_tag](#cipherset_aead_tag) + [cipher:final](#cipherfinal) + [cipher:derive](#cipherderive) * [resty.openssl.digest](#restyopenssldigest) + [digest.new](#digestnew) + [digest.istype](#digestistype) + [digest:get_provider_name](#digestget_provider_name) + [digest:gettable_params, digest:settable_params, digest:get_param, digest:set_params](#digestgettable_params-digestsettable_params-digestget_param-digestset_params) + [digest:update](#digestupdate) + [digest:final](#digestfinal) + [digest:reset](#digestreset) * [resty.openssl.hmac](#restyopensslhmac) + [hmac.new](#hmacnew) + [hmac.istype](#hmacistype) + [hmac:update](#hmacupdate) + [hmac:final](#hmacfinal) + [hmac:reset](#hmacreset) * [resty.openssl.mac](#restyopensslmac) + [mac.new](#macnew) + [mac.istype](#macistype) + [mac:get_provider_name](#macget_provider_name) + [mac:gettable_params, mac:settable_params, mac:get_param, mac:set_params](#macgettable_params-macsettable_params-macget_param-macset_params) + [mac:update](#macupdate) + [mac:final](#macfinal) + [mac:reset](#macreset) * [resty.openssl.kdf](#restyopensslkdf) + [kdf.derive (legacy)](#kdfderive-legacy) + [kdf.new](#kdfnew) + [kdf:get_provider_name](#kdfget_provider_name) + [kdf:gettable_params, kdf:settable_params, kdf:get_param, kdf:set_params](#kdfgettable_params-kdfsettable_params-kdfget_param-kdfset_params) + [kdf:derive](#kdfderive) + [kdf:reset](#kdfreset) * [resty.openssl.objects](#restyopensslobjects) + [objects.obj2table](#objectsobj2table) + [objects.nid2table](#objectsnid2table) + [objects.txt2nid](#objectstxt2nid) * [resty.openssl.pkcs12](#restyopensslpkcs12) + [pkcs12.encode](#pkcs12encode) + [pkcs12.decode](#pkcs12decode) * [resty.openssl.rand](#restyopensslrand) + [rand.bytes](#randbytes) * [resty.openssl.x509](#restyopensslx509) + [x509.new](#x509new) + [x509.dup](#x509dup) + [x509.istype](#x509istype) + [x509:digest](#x509digest) + [x509:pubkey_digest](#x509pubkey_digest) + [x509:check_private_key](#x509check_private_key) + [x509:get_\*, x509:set_\*](#x509get_-x509set_) + [x509:get_lifetime](#x509get_lifetime) + [x509:set_lifetime](#x509set_lifetime) + [x509:get_signature_name, x509:get_signature_nid, x509:get_signature_digest_name](#x509get_signature_name-x509get_signature_nid-x509get_signature_digest_name) + [x509:get_extension](#x509get_extension) + [x509:add_extension](#x509add_extension) + [x509:set_extension](#x509set_extension) + [x509:get_extension_critical](#x509get_extension_critical) + [x509:set_extension_critical](#x509set_extension_critical) + [x509:get_ocsp_url](#x509get_ocsp_url) + [x509:get_crl_url](#x509get_crl_url) + [x509:sign](#x509sign) + [x509:verify](#x509verify) + [x509:tostring](#x509tostring) + [x509:to_PEM](#x509to_pem) * [resty.openssl.x509.csr](#restyopensslx509csr) + [csr.new](#csrnew) + [csr.istype](#csristype) + [csr:check_private_key](#csrcheck_private_key) + [csr:get_\*, csr:set_\*](#csrget_-csrset_) + [csr:get_signature_name, csr:get_signature_nid, csr:get_signature_digest_name](#csrget_signature_name-csrget_signature_nid-csrget_signature_digest_name) + [csr:get_extension](#csrget_extension) + [csr:add_extension](#csradd_extension) + [csr:set_extension](#csrset_extension) + [csr:get_extension_critical](#csrget_extension_critical) + [csr:set_extension_critical](#csrset_extension_critical) + [csr:sign](#csrsign) + [csr:verify](#csrverify) + [csr:tostring](#csrtostring) + [csr:to_PEM](#csrto_pem) * [resty.openssl.x509.crl](#restyopensslx509crl) + [crl.new](#crlnew) + [crl.istype](#crlistype) + [crl:get_\*, crl:set_\*](#crlget_-crlset_) + [crl:get_signature_name, crl:get_signature_nid, crl:get_signature_digest_name](#crlget_signature_name-crlget_signature_nid-crlget_signature_digest_name) + [crl:get_by_serial](#crlget_by_serial) + [crl:get_extension](#crlget_extension) + [crl:add_extension](#crladd_extension) + [crl:set_extension](#crlset_extension) + [crl:get_extension_critical](#crlget_extension_critical) + [crl:set_extension_critical](#crlset_extension_critical) + [crl:add_revoked](#crladd_revoked) + [crl:sign](#crlsign) + [crl:verify](#crlverify) + [crl:tostring](#crltostring) + [crl:text](#crltext) + [crl:to_PEM](#crlto_pem) + [crl:__metamethods](#crl__metamethods) * [resty.openssl.x509.name](#restyopensslx509name) + [name.new](#namenew) + [name.dup](#namedup) + [name.istype](#nameistype) + [name:add](#nameadd) + [name:find](#namefind) + [name:tostring](#nametostring) + [name:__metamethods](#name__metamethods) * [resty.openssl.x509.altname](#restyopensslx509altname) + [altname.new](#altnamenew) + [altname.dup](#altnamedup) + [altname.istype](#altnameistype) + [altname:add](#altnameadd) + [altname:tostring](#altnametostring) + [altname:__metamethods](#altname__metamethods) * [resty.openssl.x509.extension](#restyopensslx509extension) + [extension.new](#extensionnew) + [extension.dup](#extensiondup) + [extension.from_data](#extensionfrom_data) + [extension:to_data](#extensionto_data) + [extension.from_der](#extensionfrom_der) + [extension:to_der](#extensionto_der) + [extension.istype](#extensionistype) + [extension:get_extension_critical](#extensionget_extension_critical) + [extension:set_extension_critical](#extensionset_extension_critical) + [extension:get_object](#extensionget_object) + [extension:text](#extensiontext) * [resty.openssl.x509.extension.dist_points](#restyopensslx509extensiondist_points) + [dist_points.new](#dist_pointsnew) + [dist_points.dup](#dist_pointsdup) + [dist_points.istype](#dist_pointsistype) + [dist_points:__metamethods](#dist_points__metamethods) * [resty.openssl.x509.extension.info_access](#restyopensslx509extensioninfo_access) + [info_access.new](#info_accessnew) + [info_access.dup](#info_accessdup) + [info_access.istype](#info_accessistype) + [info_access:add](#info_accessadd) + [info_access:__metamethods](#info_access__metamethods) * [resty.openssl.x509.extensions](#restyopensslx509extensions) + [extensions.new](#extensionsnew) + [extensions.dup](#extensionsdup) + [extensions.istype](#extensionsistype) + [extensions:add](#extensionsadd) + [extensions:__metamethods](#extensions__metamethods) * [resty.openssl.x509.chain](#restyopensslx509chain) + [chain.new](#chainnew) + [chain.dup](#chaindup) + [chain.istype](#chainistype) + [chain:add](#chainadd) + [chain:__metamethods](#chain__metamethods) * [resty.openssl.x509.store](#restyopensslx509store) + [store.new](#storenew) + [store.istype](#storeistype) + [store:use_default](#storeuse_default) + [store:add](#storeadd) + [store:load_file](#storeload_file) + [store:load_directory](#storeload_directory) + [store:set_purpose](#storeset_purpose) + [store:set_depth](#storeset_depth) + [store:set_flags](#storeset_flags) + [store:verify](#storeverify) + [store:check_revocation](#storecheck_revocation) * [resty.openssl.x509.revoked](#restyopensslx509revoked) + [revoked.new](#revokednew) + [revoked.istype](#revokedistype) * [resty.openssl.ssl](#restyopensslssl) + [ssl.from_request](#sslfrom_request) + [ssl.from_socket](#sslfrom_socket) + [ssl:get_peer_certificate](#sslget_peer_certificate) + [ssl:get_peer_cert_chain](#sslget_peer_cert_chain) + [ssl:set_ciphersuites, ssl:set_cipher_list](#sslset_ciphersuites-sslset_cipher_list) + [ssl:get_ciphers](#sslget_ciphers) + [ssl:get_cipher_name](#sslget_cipher_name) + [ssl:set_timeout](#sslset_timeout) + [ssl:get_timeout](#sslget_timeout) + [ssl:set_verify](#sslset_verify) + [ssl:add_client_ca](#ssladd_client_ca) + [ssl:set_options](#sslset_options) + [ssl:get_options](#sslget_options) + [ssl:clear_options](#sslclear_options) * [resty.openssl.ssl_ctx](#restyopensslssl_ctx) + [ssl_ctx.from_request](#ssl_ctxfrom_request) + [ssl_ctx.from_socket](#ssl_ctxfrom_socket) + [ssl_ctx:set_alpns](#ssl_ctxset_alpns) * [Functions for stack-like objects](#functions-for-stack-like-objects) + [metamethods](#metamethods) + [each](#each) + [all](#all) + [count](#count) + [index](#index) * [Generic EVP parameter getter/setter](#generic-evp-parameter-gettersetter) + [gettable_params](#gettable_params) + [settable_params](#settable_params) + [get_param](#get_param) + [set_params](#set_params) - [General rules on garbage collection](#general-rules-on-garbage-collection) - [Code generation](#code-generation) - [Compatibility](#compatibility) - [Credits](#credits) - [Copyright and License](#copyright-and-license) - [See Also](#see-also) Description =========== `lua-resty-openssl` is a FFI-based OpenSSL binding library, currently supports OpenSSL `3.x` and `1.1.1` series. [Back to TOC](#table-of-contents) Status ======== Production. Synopsis ======== This library is greatly inspired by [luaossl](https://github.com/wahern/luaossl), while uses the naming conversion closer to original OpenSSL API. For example, a function called `X509_set_pubkey` in OpenSSL C API will expect to exist as `resty.openssl.x509:set_pubkey`. *CamelCase*s are replaced to *underscore_case*s, for exmaple `X509_set_serialNumber` becomes `resty.openssl.x509:set_serial_number`. Another difference than `luaossl` is that errors are never thrown using `error()` but instead return as last parameter. Each Lua table returned by `new()` contains a cdata object `ctx`. User are not supposed to manully setting `ffi.gc` or calling corresponding destructor of the `ctx` struct (like `*_free` functions). [Back to TOC](#table-of-contents) ## resty.openssl This meta module provides a version sanity check against linked OpenSSL library. [Back to TOC](#table-of-contents) ### openssl.load_library **syntax**: *name, err = openssl.load_library()* Try to load OpenSSL shared libraries. This function tries couple of known patterns the library could be named and return the name of `crypto` library if it's being successfully loaded and error if any. When running inside `resty` CLI or OpenResty with SSL enabled, calling this function is not necessary. [Back to TOC](#table-of-contents) ### openssl.load_modules **syntax**: *openssl.load_modules()* Load all available sub modules into current module: ```lua bn = require("resty.openssl.bn"), cipher = require("resty.openssl.cipher"), digest = require("resty.openssl.digest"), hmac = require("resty.openssl.hmac"), kdf = require("resty.openssl.kdf"), pkey = require("resty.openssl.pkey"), objects = require("resty.openssl.objects"), rand = require("resty.openssl.rand"), version = require("resty.openssl.version"), x509 = require("resty.openssl.x509"), altname = require("resty.openssl.x509.altname"), chain = require("resty.openssl.x509.chain"), csr = require("resty.openssl.x509.csr"), crl = require("resty.openssl.x509.crl"), extension = require("resty.openssl.x509.extension"), extensions = require("resty.openssl.x509.extensions"), name = require("resty.openssl.x509.name"), store = require("resty.openssl.x509.store"), ssl = require("resty.openssl.ssl"), ssl_ctx = require("resty.openssl.ssl_ctx"), ``` Starting OpenSSL 3.0, [`provider`](#restyopensslprovider) and [`mac`](#restyopensslmac) [`ctx`](#restyopensslctx) is also available. [Back to TOC](#table-of-contents) ### openssl.luaossl_compat **syntax**: *openssl.luaossl_compat()* Provides `luaossl` flavored API which uses *camelCase* naming; user can expect drop in replacement. For example, `pkey:get_parameters` is mapped to `pkey:getParameters`. Note that not all `luaossl` API has been implemented, please check readme for source of truth. [Back to TOC](#table-of-contents) ### openssl.get_fips_mode **syntax**: *enabled = openssl.get_fips_mode()* Returns a boolean indicating if FIPS mode is enabled. [Back to TOC](#table-of-contents) ### openssl.set_fips_mode **syntax**: *ok, err = openssl.set_fips_mode(enabled)* Toggle FIPS mode on or off. lua-resty-openssl supports following modes: **OpenSSL 1.0.2 series with fips 2.0 module** Compile the module per [security policy](https://www.openssl.org/docs/fips/SecurityPolicy-2.0.2.pdf), **OpenSSL 3.0.0 fips provider** Refer to https://wiki.openssl.org/index.php/OpenSSL_3.0 Section 7 Compile the provider per guide, install the fipsmodule.cnf that matches hash of FIPS provider fips.so. On OpenSSL 3.0 or later, this function also turns on and off default properties for EVP functions. When turned on, all applications using EVP_* API will be redirected to FIPS-compliant implementations and have no access to non-FIPS-compliant algorithms. Calling this function is equivalent of loading `fips` provider and call [openssl.set_default_properties("fips=yes")](#opensslset_default_properties). If fips provider is loaded but default properties are not set, use following to explictly fetch FIPS implementation. ```lua local provider = require "resty.openssl.provider" assert(provider.load("fips")) local cipher = require "resty.openssl.cipher" local c = assert(cipher.new("aes256")) print(c:get_provider_name()) -- prints "default" local c = assert(cipher.new("aes256", "fips=yes")) print(c:get_provider_name()) -- prints "fips" ``` [Back to TOC](#table-of-contents) ### openssl.get_fips_version_text **syntax**: *text, err = openssl.get_fips_version_text()* Returns the version text of the FIPS module, only available on OpenSSL 3.x. [Back to TOC](#table-of-contents) ### openssl.set_default_properties **syntax**: *ok, err = openssl.set_default_properties(props)* Sets the default properties for all future EVP algorithm fetches, implicit as well as explicit. See "ALGORITHM FETCHING" in crypto(7) for information about implicit and explicit fetching. [Back to TOC](#table-of-contents) ### openssl.list_cipher_algorithms **syntax**: *ret = openssl.list_cipher_algorithms(hide_provider?)* Return available cipher algorithms in an array. Set `hide_provider` to `true` to hide provider name from the result. [Back to TOC](#table-of-contents) ### openssl.list_digest_algorithms **syntax**: *ret = openssl.list_digest_algorithms(hide_provider?)* Return available digest algorithms in an array. Set `hide_provider` to `true` to hide provider name from the result. [Back to TOC](#table-of-contents) ### openssl.list_mac_algorithms **syntax**: *ret = openssl.list_mac_algorithms(hide_provider?)* Return available MAC algorithms in an array. Set `hide_provider` to `true` to hide provider name from the result. [Back to TOC](#table-of-contents) ### openssl.list_kdf_algorithms **syntax**: *ret = openssl.list_kdf_algorithms(hide_provider?)* Return available KDF algorithms in an array. Set `hide_provider` to `true` to hide provider name from the result. [Back to TOC](#table-of-contents) ### openssl.list_ssl_ciphers **syntax**: *cipher_string, err = openssl.list_ssl_ciphers(cipher_list?, ciphersuites?, protocol?)* Return default SSL ciphers as a string. `cipher_list` (prior TLSv1.3) and `ciphersuites` (TLSv1.3) can be used to expand the cipher settings matches `protocol`. ```lua openssl.list_ssl_ciphers() openssl.list_ssl_ciphers("ECDHE-ECDSA-AES128-SHA") openssl.list_ssl_ciphers("ECDHE-ECDSA-AES128-SHA", nil, "TLSv1.2") openssl.list_ssl_ciphers("ECDHE-ECDSA-AES128-SHA", "TLS_CHACHA20_POLY1305_SHA256", "TLSv1.3") ``` [Back to TOC](#table-of-contents) ## resty.openssl.ctx A module to provide OSSL_LIB_CTX context switches. OSSL_LIB_CTX is an internal OpenSSL library context type. Applications may allocate their own, but may also use NULL to use a default context with functions that take an OSSL_LIB_CTX argument. See [OSSL_LIB_CTX.3](#https://www.openssl.org/docs/manmaster/man3/OSSL_LIB_CTX.html) for deeper reading. The context is currently effective following modules: - [cipher](#restyopensslcipher) - [digest](#restyopenssldigest) - [kdf](#restyopensslkdf) - [mac](#restyopensslmac) - [pkcs12.encode](#pkcs12encode) - [pkey](#restyopensslpkey) - [provider](#restyopensslprovider) - [rand](#restyopensslrand) - [x509](#restyopensslx509), [x509.csr](#restyopensslx509csr), [x509.crl](#restyopensslx509crl) and some [x509.store](#restyopensslx509store) functions This module is only available on OpenSSL 3.0 or later. [Back to TOC](#table-of-contents) ### ctx.new **syntax**: *ok, err = ctx.new(request_context_only?, conf_file?)* Create a new context and use as default context for this module. When `request_context_only` is set to true, the context is only used inside current request's context. `conf_file` can optionally specify an OpenSSL conf file to create the context. The created context is automatically freed with its given lifecycle. ```lua -- initialize a AES cipher instance from given provider implementation only -- for current request, without interfering other part of code -- or future requests from using the same algorithm. assert(require("resty.openssl.ctx").new(true)) local p = assert(require("resty.openssl.provider").load("myprovider")) local c = require("resty.openssl.cipher").new("aes256") print(c:encrypt(string.rep("0", 32), string.rep("0", 16), "🦢")) -- don't need to release provider and ctx, they are GC'ed automatically ``` [Back to TOC](#table-of-contents) ### ctx.free **syntax**: *ctx.free(request_context_only?)* Free the context that was previously created by [ctx.new](#ctxnew). [Back to TOC](#table-of-contents) ## resty.openssl.err A module to provide error messages. [Back to TOC](#table-of-contents) ### err.format_error **syntax**: *msg = err.format_error(ctx_msg?, return_code?, all_errors?)* **syntax**: *msg = err.format_all_errors(ctx_msg?, return_code?)* Return the latest error message from the last error code. Errors are formatted as: [ctx_msg]: code: [return_code]: error:[error code]:[library name]:[func name]:[reason string]:[file name]:[line number]: On OpenSSL prior to 3.x, errors are formatted as: [ctx_msg]: code: [return_code]: [file name]:[line number]:error:[error code]:[library name]:[func name]:[reason string]: If `all_errors` is set to `true`, all errors no just the latest one will be returned in a single string. All errors thrown by this library internally only thrown the latest error. For example: ```lua local f = io.open("t/fixtures/ec_key_encrypted.pem"):read("*a") local privkey, err = require("resty.openssl.pkey").new(f, { format = "PEM", type = "pr", passphrase = "wrongpasswrod", }) ngx.say(err) -- pkey.new:load_key: error:4800065:PEM routines:PEM_do_header:bad decrypt:crypto/pem/pem_lib.c:467: ``` [Back to TOC](#table-of-contents) ### err.get_last_error_code **syntax**: *code = err.get_last_error_code()* Return the last error code. [Back to TOC](#table-of-contents) ### err.get_lib_error_string **syntax**: *lib_error_message = err.get_lib_error_string(code?)* Return the library name of the last error code as string. If `code` is set, return the library name corresponding to provided error code instead. [Back to TOC](#table-of-contents) ### err.get_reason_error_string **syntax**: *reason_error_message = err.get_reason_error_string(code?)* Return the reason of the last error code as string. If `code` is set, return the reason corresponding to provided error code instead. [Back to TOC](#table-of-contents) ## resty.openssl.version A module to provide version info. [Back to TOC](#table-of-contents) ### version_num The OpenSSL version number. [Back to TOC](#table-of-contents) ### version_text The OpenSSL version text. [Back to TOC](#table-of-contents) ### version.version **syntax**: *text = version.version(types)* Returns various OpenSSL version information. Available values for `types` are: VERSION CFLAGS BUILT_ON PLATFORM DIR ENGINES_DIR VERSION_STRING FULL_VERSION_STRING MODULES_DIR CPU_INFO ```lua local version = require("resty.openssl.version") ngx.say(string.format("%x", version.version_num)) -- outputs "101000bf" ngx.say(version.version_text) -- outputs "OpenSSL 1.1.0k 28 May 2019" ngx.say(version.version(version.PLATFORM)) -- outputs "darwin64-x86_64-cc" ``` [Back to TOC](#table-of-contents) ### version.info **syntax**: *text = version.info(types)* Returns various OpenSSL information. Available values for `types` are: INFO_ENGINES_DIR INFO_DSO_EXTENSION INFO_CPU_SETTINGS INFO_LIST_SEPARATOR INFO_DIR_FILENAME_SEPARATOR INFO_CONFIG_DIR INFO_SEED_SOURCE INFO_MODULES_DIR This function is only available on OpenSSL 3.0. Please refer to [OPENSSL_VERSION_NUMBER(3)](https://www.openssl.org/docs/manmaster/man3/OPENSSL_VERSION_NUMBER.html) for explanation of each type. ```lua local version = require("resty.openssl.version") ngx.say(version.info(version.INFO_DSO_EXTENSION)) -- outputs ".so" ``` [Back to TOC](#table-of-contents) ### version.OPENSSL_3X A boolean indicates whether the linked OpenSSL is 3.x series. [Back to TOC](#table-of-contents) ### version.OPENSSL_111 A boolean indicates whether the linked OpenSSL is 1.1.1 series. [Back to TOC](#table-of-contents) ## resty.openssl.provider Module to interact with providers. This module only work on OpenSSL >= 3.0.0. [Back to TOC](#table-of-contents) ### provider.load **syntax**: *pro, err = provider.load(name, try?)* Load provider with `name`. If `try` is set to true, OpenSSL will not disable the fall-back providers if the provider cannot be loaded and initialized. If the provider loads successfully, however, the fall-back providers are disabled. By default this functions loads provider into the default context, meaning it will affect other applications in the same process using the default context as well. If such behaviour is not desired, consider using [ctx](#restyopensslctx) to load provider only to limited scope. [Back to TOC](#table-of-contents) ### provider.istype **syntax**: *ok = pkey.provider(table)* Returns `true` if table is an instance of `provider`. Returns `false` otherwise. [Back to TOC](#table-of-contents) ### provider.is_available **syntax**: *ok, err = provider.is_available(name)* Checks if a named provider is available for use. [Back to TOC](#table-of-contents) ### provider.set_default_search_path **syntax**: *ok, err = provider.set_default_search_path(name)* Specifies the default search path that is to be used for looking for providers. [Back to TOC](#table-of-contents) ### provider:unload **syntax**: *ok, err = pro:unload(name)* Unload a provider that is previously loaded by `provider.load`. [Back to TOC](#table-of-contents) ### provider:self_test **syntax**: *ok, err = pro:self_test(name)* Runs a provider's self tests on demand. If the self tests fail then the provider will fail to provide any further services and algorithms. [Back to TOC](#table-of-contents) ### provider:get_params **syntax**: *ok, err = pro:get_params(key1, key2?...)* Returns one or more provider parameter values. ```lua local pro = require "resty.openssl.provider" local p = pro.load("default") local name = assert(p:get_params("name")) print(name) -- outputs "OpenSSL Default Provider" local result = assert(p:get_params("name", "version", "buildinfo", "status")) print(require("cjson").encode(result)) -- outputs '{"buildinfo":"3.0.0-alpha7","name":"OpenSSL Default Provider","status":1,"version":"3.0.0"}' ``` [Back to TOC](#table-of-contents) ## resty.openssl.pkey Module to interact with private keys and public keys (EVP_PKEY). Each key type may only support part of operations: Key Type | Load existing key | Key generation | Encrypt/Decrypt | Sign/Verify | Key Exchange | ---------|----------|----------------|-----------------|-------------|---------- | RSA| Y | Y | Y | Y | | DH | Y | Y | | | Y | EC | Y | Y | | Y (ECDSA) | Y (ECDH) | Ed25519 | Y | Y | | Y (PureEdDSA) | | X25519 | Y | Y | | | Y (ECDH) | Ed448 | Y | Y | | Y (PureEdDSA) | | X448 | Y | Y | | | Y (ECDH) | Direct support of encryption and decryption for EC and ECX does not exist, but processes like ECIES is possible with [pkey:derive](#pkeyderive), [kdf](#restyopensslkdf) and [cipher](#restyopensslcipher) [Back to TOC](#table-of-contents) ### pkey.new #### Load existing key **syntax**: *pk, err = pkey.new(string, opts?)* Supports loading a private or public key in PEM, DER or JWK format passed as first argument `string`. The second parameter `opts` accepts an optional table to constraint the behaviour of key loading. - `opts.format`: set explictly to `"PEM"`, `"DER"`, `"JWK"` to load specific format or set to `"*"` for auto detect - `opts.type`: set explictly to `"pr"` for privatekey, `"pu"` for public key; set to `"*"` for auto detect When loading a PEM encoded RSA key, it can either be a PKCS#8 encoded `SubjectPublicKeyInfo`/`PrivateKeyInfo` or a PKCS#1 encoded `RSAPublicKey`/`RSAPrivateKey`. When loading a encrypted PEM encoded key, the `passphrase` to decrypt it can either be set in `opts.passphrase` or `opts.passphrase_cb`: ```lua pkey.new(pem_or_der_text, { format = "*", -- choice of "PEM", "DER", "JWK" or "*" for auto detect type = "*", -- choice of "pr" for privatekey, "pu" for public key and "*" for auto detect passphrase = "secret password", -- the PEM encryption passphrase passphrase_cb = function() return "secret password" end, -- the PEM encryption passphrase callback function } ``` When loading JWK, there are couple of caveats: - Make sure the encoded JSON text is passed in, it must have been base64 decoded. - Constraint `type` on JWK key is not supported, the parameters in provided JSON will decide if a private or public key is loaded. - Only key type of `RSA`, `P-256`, `P-384` and `P-512` `EC`, `Ed25519`, `X25519`, `Ed448` and `X448` `OKP` keys are supported. - Public key part for `OKP` keys (the `x` parameter) is always not honored and derived from private key part (the `d` parameter) if it's specified. - Signatures and verification must use `ecdsa_use_raw` option to work with JWS standards for EC keys. See [pkey:sign](#pkeysign) and [pkey.verify](#pkeyverify) for detail. - When running outside of OpenResty, needs to install a JSON library (`cjson` or `dkjson`) and `basexx`. [Back to TOC](#table-of-contents) #### Key generation **syntax**: *pk, err = pkey.new(config?)* Generate a new public key or private key. To generate RSA key, `config` table can have `bits` and `exp` field to control key generation. When `config` is emitted, this function generates a 2048 bit RSA key with `exponent` of 65537, which is equivalent to: ```lua local key, err = pkey.new({ type = 'RSA', bits = 2048, exp = 65537 }) ``` To generate EC or DH key, please refer to [pkey.paramgen](#pkeyparamgen) for possible values of `config` table. For example: ```lua local key, err = pkey.new({ type = 'EC', curve = 'prime256v1', }) ``` It's also possible to pass a PEM-encoded EC or DH parameters to `config.param` for key generation: ```lua local dhparam = pkey.paramgen({ type = 'DH', group = 'dh_1024_160' }) -- OR -- local dhparam = io.read("dhparams.pem"):read("*a") local key, err = pkey.new({ type = 'DH', param = dhparam, }) ``` It's also possible to pass raw pkeyopt control strings in `config` table as used in the `genpkey` CLI program. See [openssl-genpkey(1)](https://www.openssl.org/docs/man3.0/man1/openssl-genpkey.html) for a list of options. For example: ```lua pkey.new({ type = 'RSA', bits = 2048, exp = 65537, }) -- is same as pkey.new({ type = 'RSA', exp = 65537, "rsa_keygen_bits:4096", }) ``` [Back to TOC](#table-of-contents) #### Key composition **syntax**: *pk, err = pkey.new(config?)* Compose a public or private key using existing parameters. To see list of parameters for each key, refer to [pkey:set_parameters](#pkeyset_parameters). Only `type` and `params` should exist in `config` table, all other keys will be ignored. ```lua local private_bn = require "resty.openssl.bn".new("7F48282CCA4C1A65D589C06DBE9C42AE50FBFFDF3A18CBB48498E1DE47F11BE1A3486CD8FA950D68F111970F922279D8", 16) local p_384, err = assert(require("resty.openssl.pkey").new({ type = "EC", params = { private = private_bn, group = "secp384r1", } })) ``` [Back to TOC](#table-of-contents) ### pkey.istype **syntax**: *ok = pkey.istype(table)* Returns `true` if table is an instance of `pkey`. Returns `false` otherwise. [Back to TOC](#table-of-contents) ### pkey.paramgen **syntax**: *pem_txt, err = pk.paramgen(config)* Generate parameters for EC or DH key and output as PEM-encoded text. For EC key: Parameter | Description -----------|------------- type | `"EC"` curve | EC curves. If omitted, default to `"prime192v1"`. To see list of supported EC curves, use `openssl ecparam -list_curves`. For DH key: Parameter | Description -----------|------------- type | `"DH"` bits | Generate a new DH parameter with `bits` long prime. If omitted, default to `2048`. Starting OpenSSL 3.0, only bits equal to 2048 is allowed. group | Use predefined groups instead of generating new one. `bit` will be ignored if `group` is set. Possible values for `group` are: - [RFC7919](https://tools.ietf.org/html/rfc7919#appendix-A.1) `"ffdhe2048"`, `"ffdhe3072"`, `"ffdhe4096"`, `"ffdhe6144"`, `"ffdhe8192"` - [RFC5114](https://tools.ietf.org/html/rfc5114#section-2) `"dh_1024_160"`, `"dh_2048_224"`, `"dh_2048_256"` - [RFC3526](https://tools.ietf.org/html/rfc3526#page-3) `"modp_1536"`, `"modp_2048"`, `"modp_3072"`, `"modp_4096"`, `"modp_6144"`, `"modp_8192"` ```lua local pem, err = pkey.paramgen({ type = 'EC', curve = 'prime192v1', }) local pem, err = pkey.paramgen({ type = 'DH', group = 'ffdhe4096', }) ``` It's also possible to pass raw pkeyopt control strings in `config` table as used in the `genpkey` CLI program. See [openssl-genpkey(1)](https://www.openssl.org/docs/man3.0/man1/openssl-genpkey.html) for a list of options. [Back to TOC](#table-of-contents) ### pkey:get_provider_name **syntax**: *name = pkey:get_provider_name()* Returns the provider name of `pkey`. This function is available since OpenSSL 3.0. [Back to TOC](#table-of-contents) ## pkey:gettable_params, pkey:settable_params, pkey:get_param, pkey:set_params Query settable or gettable params and set or get params. See [Generic EVP parameter getter/setter](#generic-evp-parameter-gettersetter). [Back to TOC](#table-of-contents) ### pkey:get_parameters **syntax**: *parameters, err = pk:get_parameters()* Returns a table containing the `parameters` of pkey instance. [Back to TOC](#table-of-contents) ### pkey:set_parameters **syntax**: *ok, err = pk:set_parameters(params)* Set the parameters of the pkey from a table `params`. If the parameter is not set in the `params` table, it remains untouched in the pkey instance. ```lua local pk, err = require("resty.openssl.pkey").new() local parameters, err = pk:get_parameters() local e = parameters.e ngx.say(e:to_number()) -- outputs 65537 local ok, err = pk:set_parameters({ e = require("resty.openssl.bn").from_hex("100001") }) local ok, err = pk:set_parameters(parameters) ``` Parameters for RSA key: Parameter | Description | Type -----------|-------------|------ n | modulus common to both public and private key | [bn](#restyopensslbn) e | public exponent | [bn](#restyopensslbn) d | private exponent | [bn](#restyopensslbn) p | first factor of **n** | [bn](#restyopensslbn) q | second factor of **n** | [bn](#restyopensslbn) dmp1 | `d mod (p - 1)`, exponent1 | [bn](#restyopensslbn) dmq1 | `d mod (q - 1)`, exponent2 | [bn](#restyopensslbn) iqmp | `(InverseQ)(q) = 1 mod p`, coefficient | [bn](#restyopensslbn) Parameters for EC key: Parameter | Description | Type -----------|-------------|----- private | private key | [bn](#restyopensslbn) public | public key | [bn](#restyopensslbn) x | x coordinate of the public key| [bn](#restyopensslbn) y | y coordinate of the public key| [bn](#restyopensslbn) group | the named curve group | [NID] as a number, when passed in as `set_parameters()`, it's also possible to use the text representation. This is different from `luaossl` where a `EC_GROUP` instance is returned. It's not possible to set `x`, `y` with `public` at same time as `x` and `y` is basically another representation of `public`. Also currently it's only possible to set `x` and `y` at same time. Parameters for DH key: Parameter | Description | Type -----------|-------------|----- private | private key | [bn](#restyopensslbn) public | public key | [bn](#restyopensslbn) p | prime modulus | [bn](#restyopensslbn) q | reference position | [bn](#restyopensslbn) p | base generator | [bn](#restyopensslbn) Parameters for Curve25519 and Curve448 keys: Parameter | Description | Type -----------|-------------|----- private | raw private key represented as bytes | string public | raw public key represented as bytes | string [Back to TOC](#table-of-contents) ### pkey:is_private **syntax**: *ok = pk:is_private()* Checks whether `pk` is a private key. Returns true if it's a private key, returns false if it's a public key. [Back to TOC](#table-of-contents) ### pkey:get_key_type **syntax**: *obj, err = pk:get_key_type()* Returns a ASN1_OBJECT of key type of the private key as a table. ```lua local pkey, err = require("resty.openssl.pkey").new({type="X448"}) ngx.say(require("cjson").encode(pkey:get_key_type())) -- outputs '{"ln":"X448","nid":1035,"sn":"X448","id":"1.3.101.111"}' ``` [Back to TOC](#table-of-contents) ### pkey:get_default_digest_type **syntax**: *obj, err = pk:get_default_digest_type()* Returns a ASN1_OBJECT of key type of the private key as a table. An additional field `mandatory` is also returned in the table, if `mandatory` is true then other digests can not be used. ```lua local pkey, err = require("resty.openssl.pkey").new() ngx.say(require("cjson").encode(pkey:get_default_digest_type())) -- outputs '{"ln":"sha256","nid":672,"id":"2.16.840.1.101.3.4.2.1","mandatory":false,"sn":"SHA256"}' ``` [Back to TOC](#table-of-contents) ### pkey:sign **syntax**: *signature, err = pk:sign(digest)* **syntax**: *signature, err = pk:sign(message, md_alg?, padding?, opts?)* Perform a digest signing using the private key defined in `pkey` instance. The first parameter must be a [resty.openssl.digest](#restyopenssldigest) instance or a string. Returns the signed text and error if any. When passing a [digest](#restyopenssldigest) instance as first parameter, it should not have been called [final()](#digestfinal), user should only use [update()](#digestupdate). This mode only supports RSA and EC keys. When passing a string as first parameter, `md_alg` parameter will specify the name to use when signing. When `md_alg` is undefined, for RSA and EC keys, this function does SHA256 by default. For Ed25519 or Ed448 keys, this function does a PureEdDSA signing, no message digest should be specified and will not be used. For RSA key, it's also possible to specify `padding` scheme with following choices: ```lua pkey.PADDINGS = { RSA_PKCS1_PADDING = 1, RSA_SSLV23_PADDING = 2, RSA_NO_PADDING = 3, RSA_PKCS1_OAEP_PADDING = 4, RSA_X931_PADDING = 5, -- sign only RSA_PKCS1_PSS_PADDING = 6, -- sign and verify only } ``` When `padding` is `RSA_PKCS1_PSS_PADDING`, it's possible to specify PSS salt length by setting `opts.pss_saltlen`. For EC key, this function does a ECDSA signing. Note that OpenSSL does not support EC digital signature (ECDSA) with the obsolete MD5 hash algorithm and will return error on this combination. See [EVP_DigestSign(3)](https://www.openssl.org/docs/manmaster/man3/EVP_DigestSign.html) for a list of algorithms and associated public key algorithms. Normally, the ECDSA signature is encoded in ASN.1 DER format. If the `opts` table contains a `ecdsa_use_raw` field with a true value, a binary with just the concatenation of binary representation `pr` and `ps` is returned. This is useful for example to send the signature as JWS. `opts` is a table that accepts additional parameters with following choices: ``` { pss_saltlen, -- For PSS mode only this option specifies the salt length. mgf1_md, -- For PSS and OAEP padding sets the MGF1 digest. If the MGF1 digest is not explicitly set in PSS mode then the signing digest is used. oaep_md, -- The digest used for the OAEP hash function. If not explicitly set then SHA1 is used. } ``` It's also possible to pass raw pkeyopt control strings as used in the `pkeyutl` CLI program. This lets user pass in options that are not explictly supported as parameters above. See [openssl-pkeyutl(1)](https://www.openssl.org/docs/manmaster/man1/openssl-pkeyutl.html) for a list of options. ```lua pk:sign(message, nil, pk.PADDINGS.RSA_PKCS1_OAEP_PADDING, { oaep_md = "sha256", }) -- is same as pk:sign(message, nil, nil, { "rsa_padding_mode:oaep", "rsa_oaep_md:sha256", }) -- in pkeyutl CLI the above is equivalent to: `openssl pkeyutl -sign -pkeyopt rsa_padding_mode:oaep -pkeyopt rsa_oaep_md:sha256 ``` To sign a message without doing message digest, please check [pkey:sign_raw](#pkeysign_raw). [Back to TOC](#table-of-contents) ### pkey:verify **syntax**: *ok, err = pk:verify(signature, digest)* **syntax**: *ok, err = pk:verify(signature, message, md_alg?, padding?, opts?)* Verify a signture (which can be the string returned by [pkey:sign](#pkey-sign)). The second argument must be a [resty.openssl.digest](#restyopenssldigest) instance that uses the same digest algorithm as used in `sign` or a string. `ok` returns `true` if verficiation is successful and `false` otherwise. Note when verfication failed `err` will not be set when used with OpenSSL 1.1.1 or lower. When passing [digest](#restyopenssldigest) instances as second parameter, it should not have been called [final()](#digestfinal), user should only use [update()](#digestupdate). This mode only supports RSA and EC keys. When passing a string as second parameter, `md_alg` parameter will specify the name to use when verifying. When `md_alg` is undefined, for RSA and EC keys, this function does SHA256 by default. For Ed25519 or Ed448 keys, this function does a PureEdDSA verification, no message digest should be specified and will not be used. When key is a RSA key, the function accepts an optional argument `padding` which choices of values are same as those in [pkey:sign](#pkeysign). When `padding` is `RSA_PKCS1_PSS_PADDING`, it's possible to specify PSS salt length by setting `opts.pss_saltlen`. For EC key, this function does a ECDSA verification. Normally, the ECDSA signature should be encoded in ASN.1 DER format. If the `opts` table contains a `ecdsa_use_raw` field with a true value, this library treat `signature` as concatenation of binary representation `pr` and `ps`. This is useful for example to verify the signature as JWS. `opts` is a table that accepts additional parameters which choices of values are same as those in [pkey:sign](#pkeysign). ```lua -- RSA and EC keys local pk, err = require("resty.openssl.pkey").new() local digest, err = require("resty.openssl.digest").new("SHA256") digest:update("dog") -- WRONG: -- digest:final("dog") local signature, err = pk:sign(digest) -- uses SHA256 by default local signature, err = pk:sign("dog") ngx.say(ngx.encode_base64(signature)) -- uses SHA256 and PSS padding local signature_pss, err = pk:sign("dog", "sha256", pk.PADDINGS.RSA_PKCS1_PSS_PADDING) digest, err = require("resty.openssl.digest").new("SHA256") digest:update("dog") local ok, err = pk:verify(signature, digest) -- uses SHA256 by default local ok, err = pk:verify(signature, "dog") -- uses SHA256 and PSS padding local ok, err = pk:verify(signature_pss, "dog", "sha256", pk.PADDINGS.RSA_PKCS1_PSS_PADDING) -- Ed25519 and Ed448 keys local pk, err = require("resty.openssl.pkey").new({ type = "Ed25519", }) local signature, err = pk:sign("23333") ngx.say(ngx.encode_base64(signature)) ``` To verify a message without doing message digest, please check [pkey:verify_raw](#pkeyverify_raw) and [pkey:verify_recover](#pkeyverify_recover). [Back to TOC](#table-of-contents) ### pkey:encrypt **syntax**: *cipher_txt, err = pk:encrypt(txt, padding?, opts?)* Encrypts plain text `txt` with `pkey` instance, which must loaded a public key. The optional second argument `padding` has same meaning as in [pkey:sign](#pkeysign). If omitted, `padding` is default to `pkey.PADDINGS.RSA_PKCS1_PADDING`. The third optional argument `opts` has same meaning as in [pkey:sign](#pkeysign). [Back to TOC](#table-of-contents) ### pkey:decrypt **syntax**: *txt, err = pk:decrypt(cipher_txt, padding?, opts?)* Decrypts cipher text `cipher_txt` with pkey instance, which must loaded a private key. The optional second argument `padding` has same meaning as in [pkey:sign](#pkeysign). If omitted, `padding` is default to `pkey.PADDINGS.RSA_PKCS1_PADDING`. The third optional argument `opts` has same meaning as in [pkey:sign](#pkeysign). ```lua local pkey = require("resty.openssl.pkey") local privkey, err = pkey.new() local pub_pem = privkey:to_PEM("public") local pubkey, err = pkey.new(pub_pem) local s, err = pubkey:encrypt("🦢", pkey.PADDINGS.RSA_PKCS1_PADDING) ngx.say(#s) -- outputs 256 local decrypted, err = privkey:decrypt(s) ngx.say(decrypted) -- outputs "🦢" ``` [Back to TOC](#table-of-contents) ### pkey:sign_raw **syntax**: *signature, err = pk:sign_raw(txt, padding?, opts?)* Signs the cipher text `cipher_txt` with pkey instance, which must loaded a private key. The optional second argument `padding` has same meaning as in [pkey:sign](#pkeysign). If omitted, `padding` is default to `pkey.PADDINGS.RSA_PKCS1_PADDING`. The third optional argument `opts` has same meaning as in [pkey:sign](#pkeysign). This function may also be called "private encrypt" in some implementations like NodeJS or PHP. Do note as the function names suggested, this function is not secure to be regarded as an encryption. When developing new applications, user should use [pkey:sign](#pkeysign) for signing with digest, or [pkey:encrypt](#pkeyencrypt) for encryption. See [examples/raw-sign-and-recover.lua](https://github.com/fffonion/lua-resty-openssl/blob/master/examples/raw-sign-and-recover.lua) for an example. [Back to TOC](#table-of-contents) ### pkey:verify_raw **syntax**: *ok, err = pk:verify_raw(signature, data, md_alg, padding?, opts?)* Verify the cipher text `signature` with the message `data` with pkey instance, which must loaded a public key. Set the message digest to `md_alg` but doesn't do message digest automatically, in other words, this function assumes `data` has already been hashed with `md_alg`. When `md_alg` is undefined, for RSA and EC keys, this function does SHA256 by default. For Ed25519 or Ed448 keys, no default value is set. The optinal fourth argument `padding` has same meaning as in [pkey:sign](#pkeysign). If omitted, `padding` is default to `pkey.PADDINGS.RSA_PKCS1_PADDING`. The fifth optional argument `opts` has same meaning as in [pkey:sign](#pkeysign). See [examples/raw-sign-and-recover.lua](https://github.com/fffonion/lua-resty-openssl/blob/master/examples/raw-sign-and-recover.lua) for an example. [Back to TOC](#table-of-contents) ### pkey:verify_recover **syntax**: *txt, err = pk:verify_recover(signature, padding?, opts?)* Verify the cipher text `signature` with pkey instance, which must loaded a public key, and also returns the original text being signed. This operation is only supported by RSA key. The optional second argument `padding` has same meaning as in [pkey:sign](#pkeysign). If omitted, `padding` is default to `pkey.PADDINGS.RSA_PKCS1_PADDING`. The third optional argument `opts` has same meaning as in [pkey:sign](#pkeysign). This function may also be called "public decrypt" in some implementations like NodeJS or PHP. See [examples/raw-sign-and-recover.lua](https://github.com/fffonion/lua-resty-openssl/blob/master/examples/raw-sign-and-recover.lua) for an example. [Back to TOC](#table-of-contents) ### pkey:derive **syntax**: *txt, err = pk:derive(peer_key)* Derive public key algorithm shared secret `peer_key`, which must be a [pkey](#restyopensslpkey) instance. See [examples/x25519-dh.lua](https://github.com/fffonion/lua-resty-openssl/blob/master/examples/x25519-dh.lua) for an example on how key exchange works for X25519 keys with DH algorithm. [Back to TOC](#table-of-contents) ### pkey:tostring **syntax**: *txt, err = pk:tostring(private_or_public?, fmt?, is_pkcs1?)* Outputs private key or public key of pkey instance in PEM-formatted text. The first argument must be a choice of `public`, `PublicKey`, `private`, `PrivateKey` or nil. The second argument `fmt` can be `PEM`, `DER`, `JWK` or nil. If both arguments are omitted, this functions returns the `PEM` representation of public key. If `is_pkcs1` is set to true, the output is encoded using a PKCS#1 RSAPublicKey structure; `PKCS#1` encoding is currently supported for RSA key in PEM format. Writing out a PKCS#1 encoded RSA key is currently not supported when using with OpenSSL 3.0. [Back to TOC](#table-of-contents) ### pkey:to_PEM **syntax**: *pem, err = pk:to_PEM(private_or_public?, is_pkcs1?)* Equivalent to `pkey:tostring(private_or_public, "PEM", is_pkcs1)`. [Back to TOC](#table-of-contents) ## resty.openssl.bn Module to expose BIGNUM structure. Note bignum is a big integer, no float operations (like square root) are supported. [Back to TOC](#table-of-contents) ### bn.new **syntax**: *b, err = bn.new(number?)* **syntax**: *b, err = bn.new(string?, base?)* Creates a `bn` instance. The first argument can be: - `nil` to creates an empty bn instance. - A Lua number to initialize the bn instance. - A string to initialize the bn instance. The second argument `base` specifies the base of the string, and can take value from (compatible with Ruby OpenSSL.BN API): - `10` or omitted, for decimal string (`"23333"`) - `16`, for hex encoded string (`"5b25"`) - `2`, for binary string (`"\x5b\x25"`) - `0`, for MPI formated string (`"\x00\x00\x00\x02\x5b\x25"`) MPI is a format that consists of the number's length in bytes represented as a 4-byte big-endian number, and the number itself in big-endian format, where the most significant bit signals a negative number (the representation of numbers with the MSB set is prefixed with null byte). [Back to TOC](#table-of-contents) ### bn.dup **syntax**: *b, err = bn.dup(bn_ptr_cdata)* Duplicates a `BIGNUM*` to create a new `bn` instance. [Back to TOC](#table-of-contents) ### bn.istype **syntax**: *ok = bn.istype(table)* Returns `true` if table is an instance of `bn`. Returns `false` otherwise. [Back to TOC](#table-of-contents) ### bn.set **syntax**: *b, err = bn:set(number)* **syntax**: *b, err = bn:set(string, base?)* Reuse the existing bn instance and reset its value with given number or string. Refer to [bn.new](#bnnew) for the type of arguments supported. [Back to TOC](#table-of-contents) ### bn.from_binary, bn:to_binary **syntax**: *bn, err = bn.from_binary(bin)* **syntax**: *bin, err = bn:to_binary(padto?)* Creates a `bn` instance from binary string. Exports the BIGNUM value in binary string. `bn:to_binary` accepts an optional number argument `padto` that can be used to pad leading zeros to the output to a specific length. ```lua local to_hex = require "resty.string".to_hex local b, err = require("resty.openssl.bn").from_binary("\x5b\x25") local bin, err = b:to_binary() ngx.say(to_hex(bin)) -- outputs "5b25 ``` [Back to TOC](#table-of-contents) ### bn.from_mpi, bn:to_mpi **syntax**: *bn, err = bn.from_mpi(bin)* **syntax**: *bin, err = bn:to_mpi()* Creates a `bn` instance from MPI formatted binary string. Exports the BIGNUM value in MPI formatted binary string. ```lua local to_hex = require "resty.string".to_hex local b, err = require("resty.openssl.bn").from_mpi("\x00\x00\x00\x02\x5b\x25") local bin, err = b:to_mpi() ngx.say(to_hex(bin)) -- outputs "000000025b25 ``` [Back to TOC](#table-of-contents) ### bn.from_hex, bn:to_hex **syntax**: *bn, err = bn.from_hex(hex)* **syntax**: *hex, err = bn:to_hex()* Creates a `bn` instance from hex encoded string. Note that the leading `0x` should not be included. A leading `-` indicating the sign may be included. Exports the `bn` instance to hex encoded string. ```lua local bn = require("resty.openssl.bn") local b = bn.from_hex("5B25") local hex, err = b:to_hex() ngx.say(hex) -- outputs "5B25" ``` [Back to TOC](#table-of-contents) ### bn.from_dec, bn:to_dec **syntax**: *bn, err = bn.from_dec(dec)* **syntax**: *dec, err = bn:to_dec()* Creates a `bn` instance from decimal string. A leading `-` indicating the sign may be included. Exports the `bn` instance to decimal string. ```lua local bn = require("resty.openssl.bn") local b = bn.from_dec("23333") local dec, err = b:to_dec() ngx.say(dec) -- outputs "23333" ``` [Back to TOC](#table-of-contents) ### bn:to_number **syntax**: *n, err = bn:to_number()* **syntax**: *n, err = bn:tonumber()* Export the lowest 32 bits or 64 bits part (based on the ABI) of `bn` instance to a number. This is useful when user wants to perform bitwise operations. ```lua local bn = require("resty.openssl.bn") local b = bn.from_dec("23333") local n, err = b:to_number() ngx.say(n) -- outputs 23333 ngx.say(type(n)) -- outputs "number" ``` [Back to TOC](#table-of-contents) ### bn.generate_prime **syntax**: *bn, err = bn.generate_prime(bits, safe)* Generates a pseudo-random prime number of bit length `bits`. If `safe` is true, it will be a safe prime (i.e. a prime p so that (p-1)/2 is also prime). The PRNG must be seeded prior to calling BN_generate_prime_ex(). The prime number generation has a negligible error probability. [Back to TOC](#table-of-contents) ### bn:__metamethods Various mathematical operations can be performed as if it's a number. ```lua local bn = require("resty.openssl.bn") local a = bn.new(123456) local b = bn.new(222) -- the following returns a bn local r r = -a r = a + b r = a - b r = a * b r = a / b -- equal to bn:idiv, returns floor division r = a % b -- all operations can be performed between number and bignum r = a + 222 r = 222 + a -- the following returns a bool local bool bool = a < b bool = a >= b -- compare between number will not work -- WRONG: bool = a < 222 ``` [Back to TOC](#table-of-contents) ### bn:add, bn:sub, bn:mul, bn:div, bn:exp, bn:mod, bn:gcd **syntax**: *r = a:op(b)* **syntax**: *r = bn.op(a, b)* Perform mathematical operations `op`. - `add`: add - `sub`: subtract - `mul`: multiply - `div`, `idiv`: floor division (division with rounding down to nearest integer) - `exp`, `pow`: the `b`-th power of `a`, this function is faster than repeated `a * a * ...`. - `mod`: modulo - `gcd`: the greatest common divider of `a` and `b`. Note that `add`, `sub`, `mul`, `div`, `mod` is also available with `+, -, *, /, %` operaters. See [above section](#bn__metamethods) for examples. ```lua local bn = require("resty.openssl.bn") local a = bn.new(123456) local b = bn.new(9876) local r -- the followings are equal r = a:add(b) r = bn.add(a, b) r = a:add(9876) r = bn.add(a, 9876) r = bn.add(123456, b) r = bn.add(123456, 9876) ``` [Back to TOC](#table-of-contents) ### bn:sqr **syntax**: *r = a:sqr()* **syntax**: *r = bn.sqr(a)* Computes the 2-th power of `a`. This function is faster than `r = a * a`. [Back to TOC](#table-of-contents) ### bn:mod_add, bn:mod_sub, bn:mod_mul, bn:mod_exp **syntax**: *r = a:op(b, m)* **syntax**: *r = bn.op(a, b, m)* Perform modulo mathematical operations `op`. - `mod_add`: adds `a` to `b` modulo `m` - `mod_sub`: substracts `b` from `a` modulo `m` - `mod_mul`: multiplies `a` by `b` and finds the non-negative remainder respective to modulus `m` - `mod_exp`, `mod_pow`: computes `a` to the `b`-th power modulo `m` (r=a^b % m). This function uses less time and space than `exp`. Do not call this function when `m` is even and any of the parameters have the `BN_FLG_CONSTTIME` flag set. ```lua local bn = require("resty.openssl.bn") local a = bn.new(123456) local b = bn.new(9876) local r -- the followings are equal r = a:mod_add(b, 3) r = bn.mod_add(a, b, 3) r = a:mod_add(9876, 3) r = bn.mod_add(a, 9876, 3) r = bn.mod_add(123456, b, 3) r = bn.mod_add(123456, 9876, 3) ``` [Back to TOC](#table-of-contents) ### bn:mod_sqr **syntax**: *r = a:mod_sqr(m)* **syntax**: *r = bn.mod_sqr(a, m)* Takes the square of `a` modulo `m`. [Back to TOC](#table-of-contents) ### bn:lshift, bn:rshift **syntax**: *r = bn:lshift(bit)* **syntax**: *r = bn.lshift(a, bit)* **syntax**: *r = bn:rshift(bit)* **syntax**: *r = bn.rshift(a, bit)* Bit shift `a` to `bit` bits. [Back to TOC](#table-of-contents) ### bn:is_zero, bn:is_one, bn:is_odd, bn:is_word **syntax**: *ok = bn:is_zero()* **syntax**: *ok = bn:is_one()* **syntax**: *ok = bn:is_odd()* **syntax**: *ok, err = bn:is_word(n)* Checks if `bn` is `0`, `1`, and odd number or a number `n` respectively. [Back to TOC](#table-of-contents) ### bn:is_prime **syntax**: *ok, err = bn:is_prime(nchecks?)* Checks if `bn` is a prime number. Returns `true` if it is prime with an error probability of less than 0.25^`nchecks` and error if any. If omitted, `nchecks` is set to 0 which means to select number of iterations basedon the size of the number > This function perform a Miller-Rabin probabilistic primality test with nchecks iterations. If nchecks == BN_prime_checks (0), a number of iterations is used that yields a false positive rate of at most 2^-64 for random input. The error rate depends on the size of the prime and goes down for bigger primes. The rate is 2^-80 starting at 308 bits, 2^-112 at 852 bits, 2^-128 at 1080 bits, 2^-192 at 3747 bits and 2^-256 at 6394 bits. > When the source of the prime is not random or not trusted, the number of checks needs to be much higher to reach the same level of assurance: It should equal half of the targeted security level in bits (rounded up to the next integer if necessary). For instance, to reach the 128 bit security level, nchecks should be set to 64. See also [BN_is_prime(3)](https://www.openssl.org/docs/manmaster/man3/BN_is_prime.html). [Back to TOC](#table-of-contents) ## resty.openssl.cipher Module to interact with symmetric cryptography (EVP_CIPHER). [Back to TOC](#table-of-contents) ### cipher.new **syntax**: *d, err = cipher.new(cipher_name, properties?)* Creates a cipher instance. `cipher_name` is a case-insensitive string of cipher algorithm name. To view a list of cipher algorithms implemented, use [openssl.list_cipher_algorithms](#openssllist_cipher_algorithms) or `openssl list -cipher-algorithms` Staring from OpenSSL 3.0, this function accepts an optional `properties` parameter to explictly select provider to fetch algorithms. [Back to TOC](#table-of-contents) ### cipher.istype **syntax**: *ok = cipher.istype(table)* Returns `true` if table is an instance of `cipher`. Returns `false` otherwise. [Back to TOC](#table-of-contents) ### cipher.set_buffer_size **syntax**: *ok = cipher.set_buffer_size(sz)* Resize the internal buffer size used by all cipher instance. The default buffer size is 1024 bytes. If you are expecting to pass input text larger than 1024 bytes at one time to `update()`, `encrypt()` or `decrypt()`, setting the buffer to larger than the expected input size will improve performance by let more code to be JIT-able. Avoid call this function at hotpath, as this re-allocate the buffer every time it's called. [Back to TOC](#table-of-contents) ### cipher:get_provider_name **syntax**: *name = cipher:get_provider_name()* Returns the provider name of `cipher`. This function is available since OpenSSL 3.0. [Back to TOC](#table-of-contents) ## cipher:gettable_params, cipher:settable_params, cipher:get_param, cipher:set_params Query settable or gettable params and set or get params. See [Generic EVP parameter getter/setter](#generic-evp-parameter-gettersetter). [Back to TOC](#table-of-contents) ### cipher:encrypt **syntax**: *s, err = cipher:encrypt(key, iv?, s, no_padding?, aead_aad?)* Encrypt the text `s` with key `key` and IV `iv`. Returns the encrypted text in raw binary string and error if any. Optionally accepts a boolean `no_padding` which tells the cipher to enable or disable padding and default to `false` (enable padding). If `no_padding` is `true`, the length of `s` must then be a multiple of the block size or an error will occur. When using GCM or CCM mode or `chacha20-poly1305` cipher, it's also possible to pass the Additional Authenticated Data (AAD) as the fifth argument. This function is a shorthand of `cipher:init`, `cipher:set_aead_aad` (if appliable) then `cipher:final`. [Back to TOC](#table-of-contents) ### cipher:decrypt **syntax**: *s, err = cipher:decrypt(key, iv?, s, no_padding?, aead_aad?, aead_tag?)* Decrypt the text `s` with key `key` and IV `iv`. Returns the decrypted text in raw binary string and error if any. Optionally accepts a boolean `no_padding` which tells the cipher to enable or disable padding and default to `false` (enable padding). If `no_padding` is `true`, the length of `s` must then be a multiple of the block size or an error will occur; also, padding in the decrypted text will not be removed. When using GCM or CCM mode or `chacha20-poly1305` cipher, it's also possible to pas the Additional Authenticated Data (AAD) as the fifth argument and authentication tag as the sixth argument. This function is a shorthand of `cipher:init`, `cipher:set_aead_aad` (if appliable), `cipher:set_aead_tag` (if appliable) then `cipher:final`. [Back to TOC](#table-of-contents) ### cipher:init **syntax**: *ok, err = cipher:init(key, iv?, opts?)* Initialize the cipher with key `key` and IV `iv`. The optional third argument is a table consists of: ```lua { is_encrypt = false, no_padding = false, } ``` Calling function is needed before [cipher:update](#restycipherupdate) and [cipher:final](#restycipherfinal) if the cipher is not being initialized already. But not [cipher:encrypt](#restycipherencrypt) and [cipher:decrypt](#restycipherdecrypt). If you wish to reuse `cipher` instance multiple times, calling this function is necessary to clear the internal state of the cipher. The shorthand functions [cipher:encrypt](#restycipherencrypt) and [cipher:decrypt](#restycipherdecrypt) already take care of initialization and reset. [Back to TOC](#table-of-contents) ### cipher:update **syntax**: *s, err = cipher:update(partial, ...)* Updates the cipher with one or more strings. If the cipher has larger than block size of data to flush, the function will return a non-empty string as first argument. This function can be used in a streaming fashion to encrypt or decrypt continous data stream. [Back to TOC](#table-of-contents) ### cipher:update_aead_aad **syntax**: *ok, err = cipher:update_aead_aad(aad)* Provides AAD data to the cipher, this function can be called more than one times. [Back to TOC](#table-of-contents) ### cipher:get_aead_tag **syntax**: *tag, err = cipher:get_aead_tag(size?)* Gets the authentication tag from cipher with length specified as `size`. If omitted, a tag with length of half of the block size will be returned. The size cannot exceed block size. This function can only be called after encryption is finished. [Back to TOC](#table-of-contents) ### cipher:set_aead_tag **syntax**: *ok, err = cipher:set_aead_tag(tag)* Set the authentication tag of cipher with `tag`. This function can only be called before decryption starts. [Back to TOC](#table-of-contents) ### cipher:final **syntax**: *s, err = cipher:final(partial?)* Returns the encrypted or decrypted text in raw binary string, optionally accept one string to encrypt or decrypt. ```lua -- encryption local c, err = require("resty.openssl.cipher").new("aes256") c:init(string.rep("0", 32), string.rep("0", 16), { is_encrypt = true, }) c:update("🦢") local cipher, err = c:final() ngx.say(ngx.encode_base64(cipher)) -- outputs "vGJRHufPYrbbnYYC0+BnwQ==" -- OR: local c, err = require("resty.openssl.cipher").new("aes256") local cipher, err = c:encrypt(string.rep("0", 32), string.rep("0", 16), "🦢") ngx.say(ngx.encode_base64(cipher)) -- outputs "vGJRHufPYrbbnYYC0+BnwQ==" -- decryption local encrypted = ngx.decode_base64("vGJRHufPYrbbnYYC0+BnwQ==") local c, err = require("resty.openssl.cipher").new("aes256") c:init(string.rep("0", 32), string.rep("0", 16), { is_encrypt = false, }) c:update(encrypted) local cipher, err = c:final() ngx.say(cipher) -- outputs "🦢" -- OR: local c, err = require("resty.openssl.cipher").new("aes256") local cipher, err = c:decrypt(string.rep("0", 32), string.rep("0", 16), encrypted) ngx.say(cipher) -- outputs "🦢" ``` **Note:** in some implementations like `libsodium` or Java, AEAD ciphers append the `tag` (or `MAC`) at the end of encrypted ciphertext. In such case, user will need to manually cut off the `tag` with correct size(usually 16 bytes) and pass in the ciphertext and `tag` seperately. See [examples/aes-gcm-aead.lua](https://github.com/fffonion/lua-resty-openssl/blob/master/examples/aes-gcm-aead.lua) for an example to use AEAD modes with authentication. [Back to TOC](#table-of-contents) ### cipher:derive **syntax**: *key, iv, err = cipher:derive(key, salt?, count?, md?)* Derive a key and IV (if appliable) from given material that can be used in current cipher. This function is useful mainly to work with keys that were already derived from same algorithm. Newer applications should use a more modern algorithm such as PBKDF2 provided by [kdf.derive](#kdfderive). `count` is the iteration count to perform. If it's omitted, it's set to `1`. Note the recent version of `openssl enc` cli tool automatically use PBKDF2 if `-iter` is set to larger than 1, while this function will not. To use PBKDF2 to derive a key, please refer to [kdf.derive](#kdfderive). `md` is the message digest name to use, it can take one of the values `md2`, `md5`, `sha` or `sha1`. If it's omitted, it's default to `sha1`. ```lua local cipher = require("resty.openssl.cipher").new("aes-128-cfb") local key, iv, err = cipher:derive("x") -- equivalent to `openssl enc -aes-128-cfb -pass pass:x -nosalt -P -md sha1` ``` [Back to TOC](#table-of-contents) ## resty.openssl.digest Module to interact with message digest (EVP_MD_CTX). [Back to TOC](#table-of-contents) ### digest.new **syntax**: *d, err = digest.new(digest_name?, properties?)* Creates a digest instance. `digest_name` is a case-insensitive string of digest algorithm name. To view a list of digest algorithms implemented, use [openssl.list_digest_algorithms](#openssllist_digest_algorithms) or `openssl list -digest-algorithms`. If `digest_name` is omitted, it's default to `sha1`. Specially, the digest_name `"null"` represents a "null" message digest that does nothing: i.e. the hash it returns is of zero length. Staring from OpenSSL 3.0, this function accepts an optional `properties` parameter to explictly select provider to fetch algorithms. [Back to TOC](#table-of-contents) ### digest.istype **syntax**: *ok = digest.istype(table)* Returns `true` if table is an instance of `digest`. Returns `false` otherwise. [Back to TOC](#table-of-contents) ### digest:get_provider_name **syntax**: *name = digest:get_provider_name()* Returns the provider name of `digest`. This function is available since OpenSSL 3.0. [Back to TOC](#table-of-contents) ## digest:gettable_params, digest:settable_params, digest:get_param, digest:set_params Query settable or gettable params and set or get params. See [Generic EVP parameter getter/setter](#generic-evp-parameter-gettersetter). [Back to TOC](#table-of-contents) ### digest:update **syntax**: *ok, err = digest:update(partial, ...)* Updates the digest with one or more strings. [Back to TOC](#table-of-contents) ### digest:final **syntax**: *str, err = digest:final(partial?)* Returns the digest in raw binary string, optionally accept one string to digest. ```lua local d, err = require("resty.openssl.digest").new("sha256") d:update("🦢") local digest, err = d:final() ngx.say(ngx.encode_base64(digest)) -- outputs "tWW/2P/uOa/yIV1gRJySJLsHq1xwg0E1RWCvEUDlla0=" -- OR: local d, err = require("resty.openssl.digest").new("sha256") local digest, err = d:final("🦢") ngx.say(ngx.encode_base64(digest)) -- outputs "tWW/2P/uOa/yIV1gRJySJLsHq1xwg0E1RWCvEUDlla0=" ``` [Back to TOC](#table-of-contents) ### digest:reset **syntax**: *ok, err = digest:reset()* Reset the internal state of `digest` instance as it's just created by [digest.new](#digestnew). It calls [EVP_DigestInit_ex](https://www.openssl.org/docs/manmaster/man3/EVP_DigestInit_ex.html) under the hood. User must call this before reusing the same `digest` instance. [Back to TOC](#table-of-contents) ## resty.openssl.hmac Module to interact with hash-based message authentication code (HMAC_CTX). Use of this module is deprecated since OpenSSL 3.0, please use [resty.openssl.mac](#restyopensslmac) instead. [Back to TOC](#table-of-contents) ### hmac.new **syntax**: *h, err = hmac.new(key, digest_name?)* Creates a hmac instance. `digest_name` is a case-insensitive string of digest algorithm name. To view a list of digest algorithms implemented, use [openssl.list_digest_algorithms](#openssllist_digest_algorithms) or `openssl list -digest-algorithms`. If `digest_name` is omitted, it's default to `sha1`. [Back to TOC](#table-of-contents) ### hmac.istype **syntax**: *ok = hmac.istype(table)* Returns `true` if table is an instance of `hmac`. Returns `false` otherwise. [Back to TOC](#table-of-contents) ### hmac:update **syntax**: *ok, err = hmac:update(partial, ...)* Updates the HMAC with one or more strings. [Back to TOC](#table-of-contents) ### hmac:final **syntax**: *str, err = hmac:final(partial?)* Returns the HMAC in raw binary string, optionally accept one string to digest. ```lua local d, err = require("resty.openssl.hmac").new("goose", "sha256") d:update("🦢") local hmac, err = d:final() ngx.say(ngx.encode_base64(hmac)) -- outputs "k2UcrRp25tj1Spff89mJF3fAVQ0lodq/tJT53EYXp0c=" -- OR: local d, err = require("resty.openssl.hmac").new("goose", "sha256") local hmac, err = d:final("🦢") ngx.say(ngx.encode_base64(hmac)) -- outputs "k2UcrRp25tj1Spff89mJF3fAVQ0lodq/tJT53EYXp0c=" ``` [Back to TOC](#table-of-contents) ### hmac:reset **syntax**: *ok, err = hmac:reset()* Reset the internal state of `hmac` instance as it's just created by [hmac.new](#hmacnew). It calls [HMAC_Init_ex](https://www.openssl.org/docs/manmaster/man3/HMAC_Init_ex.html) under the hood. User must call this before reusing the same `hmac` instance. [Back to TOC](#table-of-contents) ## resty.openssl.mac Module to interact with message authentication code (EVP_MAC). [Back to TOC](#table-of-contents) ### mac.new **syntax**: *h, err = mac.new(key, mac, cipher?, digest?, properties?)* Creates a mac instance. `mac` is a case-insensitive string of MAC algorithm name. To view a list of digest algorithms implemented, use [openssl.list_mac_algorithms](#openssllist_mac_algorithms) or `openssl list -mac-algorithms`. At least one of `cipher` or `digest` must be specified. `cipher` is a case-insensitive string of digest algorithm name. To view a list of digest algorithms implemented, use [openssl.list_cipher_algorithms](#openssllist_cipher_algorithms) or `openssl list -cipher-algorithms`. `digest` is a case-insensitive string of digest algorithm name. To view a list of digest algorithms implemented, use [openssl.list_digest_algorithms](#openssllist_digest_algorithms) or `openssl list -digest-algorithms`. `properties` parameter can be used to explictly select provider to fetch algorithms. [Back to TOC](#table-of-contents) ### mac.istype **syntax**: *ok = mac.istype(table)* Returns `true` if table is an instance of `mac`. Returns `false` otherwise. [Back to TOC](#table-of-contents) ### mac:get_provider_name **syntax**: *name = mac:get_provider_name()* Returns the provider name of `mac`. This function is available since OpenSSL 3.0. [Back to TOC](#table-of-contents) ## mac:gettable_params, mac:settable_params, mac:get_param, mac:set_params Query settable or gettable params and set or get params. See [Generic EVP parameter getter/setter](#generic-evp-parameter-gettersetter). [Back to TOC](#table-of-contents) ### mac:update **syntax**: *ok, err = mac:update(partial, ...)* Updates the MAC with one or more strings. [Back to TOC](#table-of-contents) ### mac:final **syntax**: *str, err = mac:final(partial?)* Returns the MAC in raw binary string, optionally accept one string to digest. ```lua local d, err = require("resty.openssl.mac").new("goose", "HMAC", nil, "sha256") d:update("🦢") local mac, err = d:final() ngx.say(ngx.encode_base64(mac)) -- outputs "k2UcrRp25tj1Spff89mJF3fAVQ0lodq/tJT53EYXp0c=" -- OR: local d, err = require("resty.openssl.mac").new("goose", "HMAC", nil, "sha256") local hmac, err = d:final("🦢") ngx.say(ngx.encode_base64(mac)) -- outputs "k2UcrRp25tj1Spff89mJF3fAVQ0lodq/tJT53EYXp0c=" ``` [Back to TOC](#table-of-contents) ### mac:reset **syntax**: *ok, err = mac:reset()* Reset the internal state of `mac` instance as it's just created by [mac.new](#macnew). It calls [EVP_MAC_Init](https://www.openssl.org/docs/manmaster/man3/EVP_MAC_init.html) under the hood. User must call this before reusing the same `mac` instance. ## resty.openssl.kdf Module to interact with KDF (key derivation function). [Back to TOC](#table-of-contents) ### kdf.derive (legacy) **syntax**: *key, err = kdf.derive(options)* Use of this module is deprecated since OpenSSL 3.0, please use [kdf.new](#kdfnew) instead. Derive a key from given material. Various KDFs are supported based on OpenSSL version: `PBKDF2`([RFC 2898], [NIST SP 800-132]), `HKDF`([RFC 5869]), `TLS1-PRF`([RFC 2246], [RFC 5246] and [NIST SP 800-135 r1]) and `scrypt`([RFC 7914]) is available. `options` is a table that contains: | Key | Type | Description | Required or default | | ------------ | ---- | ----------- | ------ | | type | number | Type of KDF function to use, one of `kdf.PBKDF2`, `kdf.SCRYPT`, `kdf.TLS1_PRF` or `kdf.HKDF` | **required** | | outlen | number | Desired key length to derive | **required** | | pass | string | Initial key material to derive from | (empty string) | | salt | string | Add some salt | (empty string) | | md | string | Message digest method name to use, not effective for `scrypt` type | `"sha1"` | | properties | string | Staring from OpenSSL 3.0, this function accepts an optional `properties` parameter to explictly select provider to fetch algorithms. | | | pbkdf2_iter | number | PBKDF2 iteration count. RFC 2898 suggests an iteration count of at least 1000. Any value less than 1 is treated as a single iteration. | `1` | | hkdf_key | string | HKDF key | **required** | | hkdf_mode | number | HKDF mode to use, one of `kdf.HKDEF_MODE_EXTRACT_AND_EXPAND`, `kdf.HKDEF_MODE_EXTRACT_ONLY` or `kdf.HKDEF_MODE_EXPAND_ONLY`. To learn about mode, please refer to [EVP_PKEY_CTX_set1_hkdf_key(3)](https://www.openssl.org/docs/manmaster/man3/EVP_PKEY_CTX_set1_hkdf_key.html). Note with `kdf.HKDEF_MODE_EXTRACT_ONLY`, `outlen` is ignored and the output will be fixed size of `HMAC-`. | `kdf.HKDEF_MODE_EXTRACT_AND_EXPAND`| | hkdf_info | string | HKDF info value | (empty string) | | tls1_prf_secret | string | TLS1-PRF secret | **required** | | tls1_prf_seed | string | TLS1-PRF seed | **required** | | scrypt_maxmem | number | Scrypt maximum memory usage in bytes |`32 * 1024 * 1024` | | scrypt_N | number | Scrypt CPU/memory cost parameter, must be a power of 2 | **required** | | scrypt_r | number | Scrypt blocksize parameter (8 is commonly used) | **required** | | scrypt_p | number | Scrypt parallelization parameter | **required** | ```lua local kdf = require("resty.openssl.kdf") local key, err = kdf.derive({ type = kdf.PBKDF2, outlen = 16, pass = "1234567", md = "md5", pbkdf2_iter = 1000, }) ngx.say(ngx.encode_base64(key)) -- outputs "cDRFLQ7NWt+AP4i0TdBzog==" key, err = kdf.derive({ type = kdf.SCRYPT, outlen = 16, pass = "1234567", scrypt_N = 1024, scrypt_r = 8, scrypt_p = 16, }) ngx.say(ngx.encode_base64(key)) -- outputs "9giFtxace5sESmRb8qxuOw==" ``` [Back to TOC](#table-of-contents) ### kdf.new **syntax**: *k, err = kdf.new(kdf_name?, properties?)* Creates a kdf instance. `kdf_name` is a case-insensitive string of kdf algorithm name. To view a list of kdf algorithms implemented, use [openssl.list_kdf_algorithms](#openssllist_kdf_algorithms) or `openssl list -kdf-algorithms`. This function is available since OpenSSL 3.0. This function accepts an optional `properties` parameter to explictly select provider to fetch algorithms. [Back to TOC](#table-of-contents) ### kdf.istype **syntax**: *ok = kdf.istype(table)* Returns `true` if table is an instance of `kdf`. Returns `false` otherwise. This function is available since OpenSSL 3.0. [Back to TOC](#table-of-contents) ### kdf:get_provider_name **syntax**: *name = kdf:get_provider_name()* Returns the provider name of `kdf`. This function is available since OpenSSL 3.0. [Back to TOC](#table-of-contents) ## kdf:gettable_params, kdf:settable_params, kdf:get_param, kdf:set_params Query settable or gettable params and set or get params. See [Generic EVP parameter getter/setter](#generic-evp-parameter-gettersetter). This function is available since OpenSSL 3.0. [Back to TOC](#table-of-contents) ### kdf:derive **syntax**: *ok, err = kdf:derive(outlen, options?, options_count?)* Derive a key with length of `outlen` with `options`. Certain algorithms output fixed length of key where `outlen` should be unset. `options` is a table map holding parameters passing to `kdf`. To view the list of parameters acceptable by selecter algorithm and provider, use `kdf:settable_params`. Optionally, if length of `options` is known, user can provide its length through `options_count` to gain better performance where `options` table is relatively large. ```lua local k = assert(kdf.new("PBKDF2")) key = assert(k:derive(16, { pass = "1234567", iter = 1000, digest = "md5", salt = "", })) ngx.say(ngx.encode_base64(key)) -- outputs "cDRFLQ7NWt+AP4i0TdBzog==" assert(k:reset()) -- kdf instance is reusable, user can set common parameters -- through set_params and don't need to repeat in derive() assert(k:set_params({ iter = 1000, digest = "md5", salt = "", })) key = assert(k:derive(16, { pass = "1234567", })) ngx.say(ngx.encode_base64(key)) -- outputs "cDRFLQ7NWt+AP4i0TdBzog==" local k = assert(kdf.new("HKDF")) key = assert(k:derive(16, { digest = "md5", key = "secret", salt = "salt", info = "some info", mode = kdf.HKDEF_MODE_EXPAND_ONLY, -- as HKDF also accepts mode as string, use the literal below also works -- mode = "EXPAND_ONLY" })) ``` This function is available since OpenSSL 3.0. [Back to TOC](#table-of-contents) ### kdf:reset **syntax**: *ok, err = kdf:reset()* Reset the internal state of `kdf` instance as it's just created by [kdf.new](#kdfnew). User must call this before reusing the same `kdf` instance. [Back to TOC](#table-of-contents) ## resty.openssl.objects Helpfer module on ASN1_OBJECT. [Back to TOC](#table-of-contents) ### objects.obj2table **syntax**: *tbl = objects.bytes(asn1_obj)* Convert a ASN1_OBJECT pointer to a Lua table where ``` { id: OID of the object, nid: NID of the object, sn: short name of the object, ln: long name of the object, } ``` [Back to TOC](#table-of-contents) ### objects.nid2table **syntax**: *tbl, err = objects.nid2table(nid)* Convert a [NID] to a Lua table, returns the same format as [objects.obj2table](#objectsobj2table) [Back to TOC](#table-of-contents) ### objects.txt2nid **syntax**: *nid, err = objects.txt2nid(txt)* Convert a text representation to [NID]. [Back to TOC](#table-of-contents) ## resty.openssl.pkcs12 Module to interact with PKCS#12 format. [Back to TOC](#table-of-contents) ### pkcs12.encode **syntax**: *der, err = pkcs12.encode(data, passphrase?, properties?)* Encode data in `data` to a PKCS#12 text. `data` is a table that contains: | Key | Type | Description | Required or default | | ------------ | ---- | ----------- | ------ | | key | [pkey](#restyopensslpkey) | Private key | **required** | | cert | [x509](#restyopensslx509) | Certificate | **required** | | cacerts | A list of [x509](#restyopensslx509) as Lua table | Additional certificates | `[]` | | friendly_name | string | The name used for the supplied certificate and key | `""` | | nid_key | number or string | The [NID] or text to specify algorithm to encrypt key | `"PBE-SHA1-RC2-4"` if compiled with RC2, otherwise `"PBE-SHA1-3DES"`; on OpenSSL 3.0 and later `PBES2 with PBKDF2 and AES-256-CBC`. | | nid_cert | number or string | The [NID] or text to specify algorithm to encrypt cert | `"PBE-SHA1-3DES"`; on OpenSSL 3.0 and later `PBES2 with PBKDF2 and AES-256-CBC` | | iter | number | Key iterration count | `PKCS12_DEFAULT_ITER` (2048) | | mac_iter | number | MAC iterration count | 1 | `passphrase` is the string for encryption. If omitted, an empty string will be used. Staring from OpenSSL 3.0, this function accepts an optional `properties` parameter to explictly select provider to fetch algorithms. Note in OpenSSL 3.0 `RC2` has been moved to **legacy** provider. In order to encode p12 data with RC2 encryption, you need to [load the legacy provider](#providerload) first. ```lua local pro = require "resty.openssl.provider" local legacy_provider = assert(pro.load("legacy")) local p12, err = pkcs12.encode({ key = key, cert = cert}) assert(legacy_provider:unload()) ``` [Back to TOC](#table-of-contents) ### pkcs12.decode **syntax**: *data, err = pkcs12.decode(p12, passphrase?)* Decode a PKCS#12 text to Lua table `data`. Similar to the `data` table passed to [pkcs12.encode](#pkcs12encode), but onle `cert`, `key`, `cacerts` and `friendly_name` are returned. `passphrase` is the string for encryption. If omitted, an empty string will be used. Note in OpenSSL 3.0 `RC2` has been moved to **legacy** provider. In order to decode p12 data with RC2 encryption, you need to [load the legacy provider](#providerload) first. [Back to TOC](#table-of-contents) ## resty.openssl.rand Module to interact with random number generator. [Back to TOC](#table-of-contents) ### rand.bytes **syntax**: *str, err = rand.bytes(length, private?, strength?)* Generate random bytes with length of `length`. If `private` is set to true, a private PRNG instance is used so that a compromise of the "public" PRNG instance will not affect the secrecy of these private values. The bytes generated will have a security strength of at least `strength` bits. [Back to TOC](#table-of-contents) ## resty.openssl.x509 Module to interact with X.509 certificates. [Back to TOC](#table-of-contents) ### x509.new **syntax**: *crt, err = x509.new(txt?, fmt?, properties?)* Creates a `x509` instance. `txt` can be **PEM** or **DER** formatted text; `fmt` is a choice of `PEM`, `DER` to load specific format, or `*` for auto detect. When `txt` is omitted, `new()` creates an empty `x509` instance. Staring from OpenSSL 3.0, this function accepts an optional `properties` parameter to explictly select provider to fetch algorithms. [Back to TOC](#table-of-contents) ### x509.dup **syntax**: *x509, err = x509.dup(x509_ptr_cdata)* Duplicates a `X509*` to create a new `x509` instance. [Back to TOC](#table-of-contents) ### x509.istype **syntax**: *ok = x509.istype(table)* Returns `true` if table is an instance of `x509`. Returns `false` otherwise. [Back to TOC](#table-of-contents) ### x509:digest **syntax**: *d, err = x509:digest(digest_name?, properties?)* Returns a digest of the DER representation of the X509 certificate object in raw binary text. `digest_name` is a case-insensitive string of digest algorithm name. To view a list of digest algorithms implemented, use [openssl.list_digest_algorithms](#openssllist_digest_algorithms) or `openssl list -digest-algorithms`. If `digest_name` is omitted, it's default to `sha1`. Staring from OpenSSL 3.0, this function accepts an optional `properties` parameter to explictly select provider to fetch algorithms. [Back to TOC](#table-of-contents) ### x509:pubkey_digest **syntax**: *d, err = x509:pubkey_digest(digest_name?, properties?)* Returns a digest of the DER representation of the pubkey in the X509 object in raw binary text. `digest_name` is a case-insensitive string of digest algorithm name. To view a list of digest algorithms implemented, use [openssl.list_digest_algorithms](#openssllist_digest_algorithms) or `openssl list -digest-algorithms`. If `digest_name` is omitted, it's default to `sha1`. Staring from OpenSSL 3.0, this function accepts an optional `properties` parameter to explictly select provider to fetch algorithms. [Back to TOC](#table-of-contents) ### x509:check_private_key **syntax**: *match, err = x509:check_private_key(pkey)* Checks the consistency of private key `pkey` with the public key in current X509 object. Returns a boolean indicating if it's a match and err describing the reason. Note this function also checks if k itself is indeed a private key or not. [Back to TOC](#table-of-contents) ### x509:get_\*, x509:set_\* **syntax**: *ok, err = x509:set_**attribute**(instance)* **syntax**: *instance, err = x509:get_**attribute**()* Setters and getters for x509 attributes share the same syntax. | Attribute name | Type | Description | | ------------ | ---- | ----------- | | issuer_name | [x509.name](#restyopensslx509name) | Issuer of the certificate | | not_before | number | Unix timestamp when certificate is not valid before | | not_after | number | Unix timestamp when certificate is not valid after | | pubkey | [pkey](#restyopensslpkey) | Public key of the certificate | | serial_number | [bn](#restyopensslbn) | Serial number of the certficate | | subject_name | [x509.name](#restyopensslx509name) | Subject of the certificate | | version | number | Version of the certificate, value is one less than version. For example, `2` represents `version 3` | Additionally, getters and setters for extensions are also available: | Extension name | Type | Description | | ------------ | ---- | ----------- | | subject_alt_name | [x509.altname](#restyopensslx509altname) | [Subject Alternative Name](https://tools.ietf.org/html/rfc5280#section-4.2.1.6) of the certificate, SANs are usually used to define "additional Common Names" | | issuer_alt_name | [x509.altname](#restyopensslx509altname) | [Issuer Alternative Name](https://tools.ietf.org/html/rfc5280#section-4.2.1.7) of the certificate | | basic_constraints | table, { ca = bool, pathlen = int} | [Basic Constriants](https://tools.ietf.org/html/rfc5280#section-4.2.1.9) of the certificate | | info_access | [x509.extension.info_access](#restyopensslx509extensioninfo_access) | [Authority Information Access](https://tools.ietf.org/html/rfc5280#section-4.2.2.1) of the certificate, contains information like OCSP reponder URL. | | crl_distribution_points | [x509.extension.dist_points](#restyopensslx509extensiondist_points) | [CRL Distribution Points](https://tools.ietf.org/html/rfc5280#section-4.2.1.13) of the certificate, contains information like Certificate Revocation List(CRL) URLs. | For all extensions, `get_{extension}_critical` and `set_{extension}_critical` is also supported to access the `critical` flag of the extension. If the attribute is not found, getter will return `nil, nil`. ```lua local x509, err = require("resty.openssl.x509").new() err = x509:set_not_before(ngx.time()) local not_before, err = x509:get_not_before() ngx.say(not_before) -- outputs 1571875065 err = x509:set_basic_constraints_critical(true) ``` If type is a table, setter requires a table with case-insensitive keys to set; getter returns the value of the given case-insensitive key or a table of all keys if no key provided. ```lua local x509, err = require("resty.openssl.x509").new() err = x509:set_basic_constraints({ cA = false, pathlen = 0, }) ngx.say(x509:get_basic_constraints("pathlen")) -- outputs 0 ngx.say(x509:get_basic_constraints()) -- outputs '{"ca":false,"pathlen":0}' ``` Note that user may also access the certain extension by [x509:get_extension](#x509get_extension) and [x509:set_extension](#x509set_extension), while the later two function returns or requires [extension](#restyopensslx509extension) instead. User may use getter and setters listed here if modification of current extensions is needed; use [x509:get_extension](#x509get_extension) or [x509:set_extension](#x509set_extension) if user are adding or replacing the whole extension or getters/setters are not implemented. If the getter returned a type of `x509.*` instance, it can be converted to a [extension](#restyopensslx509extension) instance by [extension:from_data](#extensionfrom_data), and thus used by [x509:get_extension](#x509get_extension) and [x509:set_extension](#x509set_extension) [Back to TOC](#table-of-contents) ### x509:get_lifetime **syntax**: *not_before, not_after, err = x509:get_lifetime()* A shortcut of `x509:get_not_before` plus `x509:get_not_after` [Back to TOC](#table-of-contents) ### x509:set_lifetime **syntax**: *ok, err = x509:set_lifetime(not_before, not_after)* A shortcut of `x509:set_not_before` plus `x509:set_not_after`. [Back to TOC](#table-of-contents) ### x509:get_signature_name, x509:get_signature_nid, x509:get_signature_digest_name **syntax**: *sn, err = x509:get_signature_name()* **syntax**: *nid, err = x509:get_signature_nid()* **syntax**: *sn, err = x509:get_signature_digest_name()* Return the [NID] or the short name (SN) of the signature of the certificate. `x509:get_signature_digest_name` returns the short name of the digest algorithm used to sign the certificate. [Back to TOC](#table-of-contents) ### x509:get_extension **syntax**: *extension, pos, err = x509:get_extension(nid_or_txt, last_pos?)* Get X.509 `extension` matching the given [NID] to certificate, returns a [resty.openssl.x509.extension](#restyopensslx509extension) instance and the found position. If `last_pos` is defined, the function searchs from that position; otherwise it finds from beginning. Index is 1-based. ```lua local ext, pos, err = x509:get_extension("keyUsage") ngx.say(ext:text()) -- outputs "Digital Signature, Key Encipherment" local ext, pos, err = x509:get_extension("subjectKeyIdentifier") ngx.say(ext:text()) -- outputs "3D:42:13:57:8F:79:BE:30:7D:86:A9:AC:67:50:E5:56:3E:0E:AF:4F" ``` [Back to TOC](#table-of-contents) ### x509:add_extension **syntax**: *ok, err = x509:add_extension(extension)* Adds an X.509 `extension` to certificate, the first argument must be a [resty.openssl.x509.extension](#restyopensslx509extension) instance. ```lua local extension, err = require("resty.openssl.x509.extension").new( "keyUsage", "critical,keyCertSign,cRLSign" ) local x509, err = require("resty.openssl.x509").new() local ok, err = x509:add_extension(extension) ``` [Back to TOC](#table-of-contents) ### x509:set_extension **syntax**: *ok, err = x509:set_extension(extension, last_pos?)* Adds an X.509 `extension` to certificate, the first argument must be a [resty.openssl.x509.extension](#restyopensslx509extension) instance. The difference from [x509:add_extension](#x509add_extension) is that in this function if a `extension` with same type already exists, the old extension will be replaced. If `last_pos` is defined, the function replaces the same extension from that position; otherwise it finds from beginning. Index is 1-based. Returns `nil, nil` if not found. Note this function is not thread-safe. [Back to TOC](#table-of-contents) ### x509:get_extension_critical **syntax**: *ok, err = x509:get_extension_critical(nid_or_txt)* Get critical flag of the X.509 `extension` matching the given [NID] from certificate. [Back to TOC](#table-of-contents) ### x509:set_extension_critical **syntax**: *ok, err = x509:set_extension_critical(nid_or_txt, crit?)* Set critical flag of the X.509 `extension` matching the given [NID] to certificate. [Back to TOC](#table-of-contents) ### x509:get_ocsp_url **syntax**: *url_or_urls, err = x509:get_ocsp_url(return_all?)* Get OCSP URL(s) of the X.509 object. If `return_all` is set to true, returns a table containing all OCSP URLs; otherwise returns a string with first OCSP URL found. Returns `nil` if the extension is not found. [Back to TOC](#table-of-contents) ### x509:get_crl_url **syntax**: *url_or_urls, err = x509:get_crl_url(return_all?)* Get CRL URL(s) of the X.509 object. If `return_all` is set to true, returns a table containing all CRL URLs; otherwise returns a string with first CRL URL found. Returns `nil` if the extension is not found. [Back to TOC](#table-of-contents) ### x509:sign **syntax**: *ok, err = x509:sign(pkey, digest?)* Sign the certificate using the private key specified by `pkey`, which must be a [resty.openssl.pkey](#restyopensslpkey) that stores private key. Optionally accept `digest` parameter to set digest method, whichmust be a [resty.openssl.digest](#restyopenssldigest) instance. Returns a boolean indicating if signing is successful and error if any. [Back to TOC](#table-of-contents) ### x509:verify **syntax**: *ok, err = x509:verify(pkey)* Verify the certificate signature using the public key specified by `pkey`, which must be a [resty.openssl.pkey](#restyopensslpkey). Returns a boolean indicating if verification is successful and error if any. [Back to TOC](#table-of-contents) ### x509:tostring **syntax**: *str, err = x509:tostring(fmt?)* Outputs certificate in PEM-formatted text or DER-formatted binary. The first argument can be a choice of `PEM` or `DER`; when omitted, this function outputs PEM by default. [Back to TOC](#table-of-contents) ### x509:to_PEM **syntax**: *pem, err = x509:to_PEM()* Outputs the certificate in PEM-formatted text. [Back to TOC](#table-of-contents) ## resty.openssl.x509.csr Module to interact with certificate signing request (X509_REQ). See [examples/csr.lua](https://github.com/fffonion/lua-resty-openssl/blob/master/examples/csr.lua) for an example to generate CSR. [Back to TOC](#table-of-contents) ### csr.new **syntax**: *csr, err = csr.new(txt?, fmt?, properties?)* Create an empty `csr` instance. `txt` can be **PEM** or **DER** formatted text; `fmt` is a choice of `PEM`, `DER` to load specific format, or `*` for auto detect. When `txt` is omitted, `new()` creates an empty `csr` instance. Staring from OpenSSL 3.0, this function accepts an optional `properties` parameter to explictly select provider to fetch algorithms. [Back to TOC](#table-of-contents) ### csr.istype **syntax**: *ok = csr.istype(table)* Returns `true` if table is an instance of `csr`. Returns `false` otherwise. [Back to TOC](#table-of-contents) ### csr:check_private_key **syntax**: *match, err = csr:check_private_key(pkey)* Checks the consistency of private key `pkey` with the public key in current CSR object. Returns a boolean indicating if it's a match and err describing the reason. Note this function also checks if k itself is indeed a private key or not. [Back to TOC](#table-of-contents) ### csr:get_\*, csr:set_\* **syntax**: *ok, err = csr:set_**attribute**(instance)* **syntax**: *instance, err = csr:get_**attribute**()* Setters and getters for x509 attributes share the same syntax. | Attribute name | Type | Description | | ------------ | ---- | ----------- | | pubkey | [pkey](#restyopensslpkey) | Public key of the certificate request | | subject_name | [x509.name](#restyopensslx509name) | Subject of the certificate request | | version | number | Version of the certificate request, value is one less than version. For example, `2` represents `version 3` | Additionally, getters and setters for extensions are also available: | Extension name | Type | Description | | ------------ | ---- | ----------- | | subject_alt_name | [x509.altname](#restyopensslx509altname) | [Subject Alternative Name](https://tools.ietf.org/html/rfc5280#section-4.2.1.6) of the certificate request, SANs are usually used to define "additional Common Names" | For all extensions, `get_{extension}_critical` and `set_{extension}_critical` is also supported to access the `critical` flag of the extension. If the attribute is not found, getter will return `nil, nil`. ```lua local csr, err = require("resty.openssl.csr").new() err = csr:set_version(3) local version, err = csr:get_version() ngx.say(version) -- outputs 3 ``` Note that user may also access the certain extension by [csr:get_extension](#csrget_extension) and [csr:set_extension](#csrset_extension), while the later two function returns or requires [extension](#restyopensslx509extension) instead. User may use getter and setters listed here if modification of current extensions is needed; use [csr:get_extension](#csrget_extension) or [csr:set_extension](#csrset_extension) if user are adding or replacing the whole extension or getters/setters are not implemented. If the getter returned a type of `x509.*` instance, it can be converted to a [extension](#restyopensslx509extension) instance by [extension:from_data](#extensionfrom_data), and thus used by [csr:get_extension](#csrget_extension) and [csr:set_extension](#csrset_extension) [Back to TOC](#table-of-contents) ### csr:set_subject_alt Same as [csr:set_subject_alt_name](#csrget_-csrset_), this function is deprecated to align with naming convension with other functions. [Back to TOC](#table-of-contents) ### csr:get_signature_name, csr:get_signature_nid, csr:get_signature_digest_name **syntax**: *sn, err = csr:get_signature_name()* **syntax**: *nid, err = csr:get_signature_nid()* **syntax**: *sn, err = csr:get_signature_digest_name()* Return the [NID] or the short name (SN) of the signature of the certificate request. `csr:get_signature_digest_name` returns the short name of the digest algorithm used to sign the certificate. [Back to TOC](#table-of-contents) ### csr:get_extension **syntax**: *extension, pos, err = csr:get_extension(nid_or_txt, pos?)* Get X.509 `extension` matching the given [NID] to certificate, returns a [resty.openssl.x509.extension](#restyopensslx509extension) instance and the found position. If `last_pos` is defined, the function searchs from that position; otherwise it finds from beginning. Index is 1-based. ```lua local ext, pos, err = csr:get_extension("basicConstraints") ``` [Back to TOC](#table-of-contents) ### csr:get_extensions **syntax**: *extensions, err = csr:get_extensions()* Return all extensions as a [resty.openssl.x509.extensions](#restyopensslx509extensions) instance. [Back to TOC](#table-of-contents) ### csr:add_extension **syntax**: *ok, err = csr:add_extension(extension)* Adds an X.509 `extension` to csr, the first argument must be a [resty.openssl.x509.extension](#restyopensslx509extension) instance. [Back to TOC](#table-of-contents) ### csr:set_extension **syntax**: *ok, err = csr:set_extension(extension)* Adds an X.509 `extension` to csr, the first argument must be a [resty.openssl.x509.extension](#restyopensslx509extension) instance. The difference from [csr:add_extension](#csradd_extension) is that in this function if a `extension` with same type already exists, the old extension will be replaced. Note this function is not thread-safe. [Back to TOC](#table-of-contents) ### csr:get_extension_critical **syntax**: *ok, err = csr:get_extension_critical(nid_or_txt)* Get critical flag of the X.509 `extension` matching the given [NID] from csr. [Back to TOC](#table-of-contents) ### csr:set_extension_critical **syntax**: *ok, err = csr:set_extension_critical(nid_or_txt, crit?)* Set critical flag of the X.509 `extension` matching the given [NID] to csr. [Back to TOC](#table-of-contents) ### csr:sign **syntax**: *ok, err = csr:sign(pkey, digest?)* Sign the certificate request using the private key specified by `pkey`, which must be a [resty.openssl.pkey](#restyopensslpkey) that stores private key. Optionally accept `digest` parameter to set digest method, whichmust be a [resty.openssl.digest](#restyopenssldigest) instance. Returns a boolean indicating if signing is successful and error if any. [Back to TOC](#table-of-contents) ### csr:verify **syntax**: *ok, err = csr:verify(pkey)* Verify the CSR signature using the public key specified by `pkey`, which must be a [resty.openssl.pkey](#restyopensslpkey). Returns a boolean indicating if verification is successful and error if any. [Back to TOC](#table-of-contents) ### csr:tostring **syntax**: *str, err = csr:tostring(fmt?)* Outputs certificate request in PEM-formatted text or DER-formatted binary. The first argument can be a choice of `PEM` or `DER`; when omitted, this function outputs PEM by default. [Back to TOC](#table-of-contents) ### csr:to_PEM **syntax**: *pem, err = csr:to_PEM(?)* Outputs CSR in PEM-formatted text. [Back to TOC](#table-of-contents) ## resty.openssl.x509.crl Module to interact with X509_CRL(certificate revocation list). [Back to TOC](#table-of-contents) ### crl.new **syntax**: *crt, err = crl.new(txt?, fmt?, properties?)* Creates a `crl` instance. `txt` can be **PEM** or **DER** formatted text; `fmt` is a choice of `PEM`, `DER` to load specific format, or `*` for auto detect. When `txt` is omitted, `new()` creates an empty `crl` instance. Staring from OpenSSL 3.0, this function accepts an optional `properties` parameter to explictly select provider to fetch algorithms. [Back to TOC](#table-of-contents) ### crl.dup **syntax**: *crl, err = crl.dup(crl_ptr_cdata)* Duplicates a `X509_CRL*` to create a new `crl` instance. [Back to TOC](#table-of-contents) ### crl.istype **syntax**: *ok = crl.istype(table)* Returns `true` if table is an instance of `crl`. Returns `false` otherwise. [Back to TOC](#table-of-contents) ### crl:get_\*, crl:set_\* **syntax**: *ok, err = crl:set_**attribute**(instance)* **syntax**: *instance, err = crl:get_**attribute**()* Setters and getters for crl attributes share the same syntax. | Attribute name | Type | Description | | ------------ | ---- | ----------- | | issuer_name | [x509.name](#restyopensslx509name) | Issuer of the CRL | | last_update | number | Unix timestamp when CRL is not valid before | | next_update | number | Unix timestamp when CRL is not valid after | | version | number | Version of the certificate, value is one less than version. For example, `2` represents `version 3` | Additionally, getters and setters for extensions are also available: | Extension name | Type | Description | | ------------ | ---- | ----------- | For all extensions, `get_{extension}_critical` and `set_{extension}_critical` is also supported to access the `critical` flag of the extension. If the attribute is not found, getter will return `nil, nil`. ```lua local crl, err = require("resty.openssl.crl").new() err = crl:set_next_update(ngx.time()) local not_before, err = crl:get_next_update() ngx.say(not_before) -- outputs 1571875065 ``` Note that user may also access the certain extension by [crl:get_extension](#crlget_extension) and [crl:set_extension](#crlset_extension), while the later two function returns or requires [extension](#restyopensslcrlextension) instead. User may use getter and setters listed here if modification of current extensions is needed; use [crl:get_extension](#crlget_extension) or [crl:set_extension](#crlset_extension) if user are adding or replacing the whole extension or getters/setters are not implemented. If the getter returned a type of `crl.*` instance, it can be converted to a [extension](#restyopensslcrlextension) instance by [extension:from_data](#extensionfrom_data), and thus used by [crl:get_extension](#crlget_extension) and [crl:set_extension](#crlset_extension) [Back to TOC](#table-of-contents) ### crl:get_signature_name, crl:get_signature_nid, crl:get_signature_digest_name **syntax**: *sn, err = crl:get_signature_name()* **syntax**: *nid, err = crl:get_signature_nid()* **syntax**: *sn, err = crl:get_signature_digest_name()* Return the [NID] or the short name (SN) of the signature of the CRL. `crl:get_signature_digest_name` returns the short name of the digest algorithm used to sign the certificate. [Back to TOC](#table-of-contents) ### crl:get_by_serial **syntax**: *found_revoked, err = crl:get_by_serial(serial)* Find if given `serial` is in the CRL, `serial` can be [bn](#resty.openssl.bn) instance, or a hexadecimal string. Returns a table if found where: ``` { serial_number: serial number of the revoked cert in hexadecimal string, revoked_date: revoked date of the cert as unix timestamp } ``` Returns `false` if not found; specially if a serial number is removed from CRL, then `false, "not revoked (removeFromCRL)"` is returned. [Back to TOC](#table-of-contents) ### crl:get_extension **syntax**: *extension, pos, err = crl:get_extension(nid_or_txt, last_pos?)* Get X.509 `extension` matching the given [NID] to CRL, returns a [resty.openssl.x509.extension](#restyopensslx509extension) instance and the found position. If `last_pos` is defined, the function searchs from that position; otherwise it finds from beginning. Index is 1-based. [Back to TOC](#table-of-contents) ### crl:add_extension **syntax**: *ok, err = crl:add_extension(extension)* Adds an X.509 `extension` to CRL, the first argument must be a [resty.openssl.x509.extension](#restyopensslx509extension) instance. [Back to TOC](#table-of-contents) ### crl:set_extension **syntax**: *ok, err = crl:set_extension(extension, last_pos?)* Adds an X.509 `extension` to CRL, the first argument must be a [resty.openssl.x509.extension](#restyopensslx509extension) instance. The difference from [crl:add_extension](#crladd_extension) is that in this function if a `extension` with same type already exists, the old extension will be replaced. If `last_pos` is defined, the function replaces the same extension from that position; otherwise it finds from beginning. Index is 1-based. Returns `nil, nil` if not found. Note this function is not thread-safe. [Back to TOC](#table-of-contents) ### crl:get_extension_critical **syntax**: *ok, err = crl:get_extension_critical(nid_or_txt)* Get critical flag of the X.509 `extension` matching the given [NID] from CRL. [Back to TOC](#table-of-contents) ### crl:set_extension_critical **syntax**: *ok, err = crl:set_extension_critical(nid_or_txt, crit?)* Set critical flag of the X.509 `extension` matching the given [NID] to CRL. [Back to TOC](#table-of-contents) ### crl:add_revoked **syntax**: *ok, err = crl:add_revoked(revoked)* Adds a [resty.openssl.x509.revoked](#restyopensslx509revoked) instance to the CRL. [Back to TOC](#table-of-contents) ### crl:sign **syntax**: *ok, err = crl:sign(pkey, digest?)* Sign the CRL using the private key specified by `pkey`, which must be a [resty.openssl.pkey](#restyopensslpkey) that stores private key. Optionally accept `digest` parameter to set digest method, whichmust be a [resty.openssl.digest](#restyopenssldigest) instance. Returns a boolean indicating if signing is successful and error if any. [Back to TOC](#table-of-contents) ### crl:verify **syntax**: *ok, err = crl:verify(pkey)* Verify the CRL signature using the public key specified by `pkey`, which must be a [resty.openssl.pkey](#restyopensslpkey). Returns a boolean indicating if verification is successful and error if any. [Back to TOC](#table-of-contents) ### crl:tostring **syntax**: *str, err = crl:tostring(fmt?)* Outputs CRL in PEM-formatted text or DER-formatted binary. The first argument can be a choice of `PEM` or `DER`; when omitted, this function outputs PEM by default. [Back to TOC](#table-of-contents) ### crl:text **syntax**: *str, err = crl:text()* Outputs CRL in a human-readable format. [Back to TOC](#table-of-contents) ### crl:to_PEM **syntax**: *pem, err = crl:to_PEM()* Outputs the CRL in PEM-formatted text. [Back to TOC](#table-of-contents) ### crl:__metamethods **syntax**: *for i, revoked in ipairs(crl)* **syntax**: *len = #crl* **syntax**: *revoked = crl[i]* Access the revoked list as it's a Lua table. Make sure your LuaJIT compiled with `-DLUAJIT_ENABLE_LUA52COMPAT` flag; otherwise use `all`, `each`, `index` and `count` instead. See also [functions for stack-like objects](#functions-for-stack-like-objects). Each returned object is a table where: ``` { serial_number: serial number of the revoked cert in hexadecimal string, revoked_date: revoked date of the cert as unix timestamp } ``` ```lua local f = io.open("t/fixtures/TrustAsiaEVTLSProCAG2.crl"):read("*a") local crl = assert(require("resty.openssl.x509.crl").new(f)) for _, obj in ipairs(crl) do ngx.say(require("cjson").encode(obj)) end -- outputs '{"revocation_date":1577753344,"serial_number":"09159859CAC0C90203BB34C5A012C2A3"}' ``` [Back to TOC](#table-of-contents) ## resty.openssl.x509.name Module to interact with X.509 names. [Back to TOC](#table-of-contents) ### name.new **syntax**: *name, err = name.new()* Creates an empty `name` instance. [Back to TOC](#table-of-contents) ### name.dup **syntax**: *name, err = name.dup(name_ptr_cdata)* Duplicates a `X509_NAME*` to create a new `name` instance. [Back to TOC](#table-of-contents) ### name.istype **syntax**: *ok = name.istype(table)* Returns `true` if table is an instance of `name`. Returns `false` otherwise. [Back to TOC](#table-of-contents) ### name:add **syntax**: *name, err = name:add(nid_text, txt)* Adds an ASN.1 object to `name`. First arguments in the *text representation* of [NID]. Second argument is the plain text value for the ASN.1 object. Returns the name instance itself on success, or `nil` and an error on failure. This function can be called multiple times in a chained fashion. ```lua local name, err = require("resty.openssl.x509.name").new() local _, err = name:add("CN", "example.com") _, err = name :add("C", "US") :add("ST", "California") :add("L", "San Francisco") ``` [Back to TOC](#table-of-contents) ### name:find **syntax**: *obj, pos, err = name:find(nid_text, last_pos?)* Finds the ASN.1 object with the given *text representation* of [NID] from the postition of `last_pos`. By omitting the `last_pos` parameter, `find` finds from the beginning. Returns the object in a table as same format as decribed [here](#name__metamethods), the position of the found object and error if any. Index is 1-based. Returns `nil, nil` if not found. ```lua local name, err = require("resty.openssl.x509.name").new() local _, err = name:add("CN", "example.com") :add("CN", "example2.com") local obj, pos, err = name:find("CN") ngx.say(obj.blob, " at ", pos) -- outputs "example.com at 1" local obj, pos, err = name:find("2.5.4.3", 1) ngx.say(obj.blob, " at ", pos) -- outputs "example2.com at 2" ``` [Back to TOC](#table-of-contents) ### name:tostring **syntax**: *txt = name:tostring()* Outputs name in a text representation. ```lua local name, err = require("resty.openssl.x509.name").new() local _, err = name:add("CN", "example.com") :add("CN", "example2.com") ngx.say(name:tostring()) -- outputs "CN=example.com/CN=example2.com" ``` [Back to TOC](#table-of-contents) ### name:__metamethods **syntax**: *for k, obj in pairs(name)* **syntax**: *len = #name* **syntax**: *k, v = name[i]* Access the underlying objects as it's a Lua table. Make sure your LuaJIT compiled with `-DLUAJIT_ENABLE_LUA52COMPAT` flag; otherwise use `all`, `each`, `index` and `count` instead. See also [functions for stack-like objects](#functions-for-stack-like-objects). Each returned object is a table where: ``` { id: OID of the object, nid: NID of the object, sn: short name of the object, ln: long name of the object, blob: value of the object, } ``` ```lua local name, err = require("resty.openssl.x509.name").new() local _, err = name:add("CN", "example.com") for k, obj in pairs(name) do ngx.say(k, ":", require("cjson").encode(obj)) end -- outputs 'CN: {"sn":"CN","id":"2.5.4.3","nid":13,"blob":"3.example.com","ln":"commonName"}' ``` [Back to TOC](#table-of-contents) ## resty.openssl.x509.altname Module to interact with GENERAL_NAMES, an extension to X.509 names. [Back to TOC](#table-of-contents) ### altname.new **syntax**: *altname, err = altname.new()* Creates an empty `altname` instance. [Back to TOC](#table-of-contents) ### altname.dup **syntax**: *altname, err = altname.dup(altname_ptr_cdata)* Duplicates a `STACK_OF(GENERAL_NAMES)` to create a new `altname` instance. The function creates a new stack but won't duplicates elements in the stack. [Back to TOC](#table-of-contents) ### altname.istype **syntax**: *altname = digest.istype(table)* Returns `true` if table is an instance of `altname`. Returns `false` otherwise. [Back to TOC](#table-of-contents) ### altname:add **syntax**: *altname, err = altname:add(key, value)* Adds a name to altname stack, first argument is case-insensitive and can be one of RFC822Name RFC822 Email UniformResourceIdentifier URI DNSName DNS IP IPAddress This function can be called multiple times in a chained fashion. [Back to TOC](#table-of-contents) ### altname:tostring **syntax**: *txt = altname:tostring()* Outputs altname in a text representation. ```lua local altname, err = require("resty.openssl.x509.altname").new() _, err = altname :add("DNS", "2.example.com") :add("DnS", "3.example.com") ngx.say(altname:tostring()) -- outputs "DNS=2.example.com/DNS=3.example.com" ``` [Back to TOC](#table-of-contents) ### altname:__metamethods **syntax**: *for k, obj in pairs(altname)* **syntax**: *len = #altname* **syntax**: *k, v = altname[i]* Access the underlying objects as it's a Lua table. Make sure your LuaJIT compiled with `-DLUAJIT_ENABLE_LUA52COMPAT` flag; otherwise use `all`, `each`, `index` and `count` instead. See also [functions for stack-like objects](#functions-for-stack-like-objects). Only the following types are decoded, other types are decoded as `"TYPE:"`: RFC822Name / Email URI DNS DirName [Back to TOC](#table-of-contents) ## resty.openssl.x509.extension Module to interact with every X.509 extensions. This module is particular useful to create extensions not supported by `x509.*` modules or custom extensions. [Back to TOC](#table-of-contents) ### extension.new **syntax**: *ext, err = extension.new(name, value, data?)* Creates a new `extension` instance. `name` and `value` are strings in OpenSSL [arbitrary extension format](https://www.openssl.org/docs/manmaster/man5/x509v3_config.html). `data` can be a table, string or nil. Where `data` is a table, the following key will be looked up: ```lua data = { issuer = resty.openssl.x509 instance, subject = resty.openssl.x509 instance, request = resty.openssl.x509.csr instance, crl = resty.openssl.x509.crl instance, issuer_pkey = resty.openssl.pkey instance, -- >= OpenSSL 3.0 } ``` From OpenSSL 3.0, `issuer_pkey` can be specified as a fallback source for generating the authority key identifier extension when `issuer` is same as `subject`. When `data` is a string, it's the full nconf string. Using section lookup from `value` to `data` is also supported.
Example usages: ```lua local extension = require("resty.openssl.x509.extension") -- extendedKeyUsage=serverAuth,clientAuth local ext, err = extension.new("extendedKeyUsage", "serverAuth,clientAuth") -- crlDistributionPoints=URI:http://myhost.com/myca.crl ext, err = extension.new("crlDistributionPoints", "URI:http://myhost.com/myca.crl") -- with section lookup ext, err = extension.new( "crlDistributionPoints", "crldp1_section", [[ [crldp1_section] fullname=URI:http://myhost.com/myca.crl CRLissuer=dirName:issuer_sect reasons=keyCompromise, CACompromise [issuer_sect] C=UK O=Organisation CN=Some Name ]] ) -- combine section lookup with other value ext, err = extension.new( "certificatePolicies", "ia5org,1.2.3.4,1.5.6.7.8,@polsect", [[ [polsect] policyIdentifier = 1.3.5.8 CPS.1="http://my.host.name/" CPS.2="http://my.your.name/" userNotice.1=@notice [notice] explicitText="Explicit Text Here" organization="Organisation Name" noticeNumbers=1,2,3,4 ]] )) -- subjectKeyIdentifier=hash local x509, err = require("resty.openssl.x509").new() ext, err = extension.new("subjectKeyIdentifier", "hash", { subject = x509 }) ```
See [examples/tls-alpn-01.lua](https://github.com/fffonion/lua-resty-openssl/blob/master/examples/tls-alpn-01.lua) for an example to create extension with an unknown nid. [Back to TOC](#table-of-contents) ### extension.dup **syntax**: *ext, err = extension.dup(extension_ptr_cdata)* Creates a new `extension` instance from `X509_EXTENSION*` pointer. [Back to TOC](#table-of-contents) ### extension.from_der **syntax**: *ext, ok = extension.from_der(der, nid_or_txt, crit?)* Creates a new `extension` instance. `der` is the ASN.1 encoded string to be set for the extension. `nid_or_txt` is a number or text representation of [NID] and `crit` is the critical flag of the extension. See [examples/tls-alpn-01.lua](https://github.com/fffonion/lua-resty-openssl/blob/master/examples/tls-alpn-01.lua) for an example to create extension with an unknown nid. [Back to TOC](#table-of-contents) ### extension:to_der **syntax**: *der, ok = extension:to_der()* Returns the ASN.1 encoded (DER) value of the extension. `nid_or_txt` is a number or text representation of [NID]. Note `DER` is a binary encoding format. Consider using [extension:text](#extensiontext) for human readable or printable output. [Back to TOC](#table-of-contents) ### extension.from_data **syntax**: *ext, ok = extension.from_data(table, nid_or_txt, crit?)* Creates a new `extension` instance. `table` can be instance of: - [x509.altname](#restyopensslx509altname) - [x509.extension.info_access](#restyopensslx509extensioninfo_access) - [x509.extension.dist_points](#restyopensslx509extensiondist_points) `nid_or_txt` is a number or text representation of [NID] and `crit` is the critical flag of the extension. [Back to TOC](#table-of-contents) ### extension.to_data **syntax**: *ext, ok = extension:to_data(nid_or_txt)* Convert the `extension` to another wrapper instance. Currently supported following: - [x509.altname](#restyopensslx509altname) `nid_or_txt` is a number or text representation of [NID]. [Back to TOC](#table-of-contents) ### extension.istype **syntax**: *ok = extension.istype(table)* Returns `true` if table is an instance of `extension`. Returns `false` otherwise. [Back to TOC](#table-of-contents) ### extension:get_extension_critical **syntax**: *crit, err = extension:get_extension_critical()* Returns `true` if extension is critical. Returns `false` otherwise. [Back to TOC](#table-of-contents) ### extension:set_extension_critical **syntax**: *ok, err = extension:set_extension_critical(crit)* Set the critical flag of the extension. [Back to TOC](#table-of-contents) ### extension:get_object **syntax**: *obj = extension:get_object()* Returns the name of extension as ASN.1 Object. User can further use helper functions in [resty.openssl.objects](#restyopensslobjects) to print human readable texts. [Back to TOC](#table-of-contents) ### extension:text **syntax**: *txt, err = extension:text()* Returns the text representation of extension. This functions calls `X509V3_EXT_print` under the hood, and fallback to `ASN1_STRING_print` if the former failed. It thus has exact same output with that of `openssl x509 -text`. ```lua local objects = require "resty.openssl.objects" ngx.say(cjson.encode(objects.obj2table(extension:get_object()))) -- outputs '{"ln":"X509v3 Subject Key Identifier","nid":82,"sn":"subjectKeyIdentifier","id":"2.5.29.14"}' ngx.say(extension:text()) -- outputs "C9:C2:53:61:66:9D:5F:AB:25:F4:26:CD:0F:38:9A:A8:49:EA:48:A9" ``` [Back to TOC](#table-of-contents) ### extension:tostring **syntax**: *txt, err = extension:tostring()* Same as [extension:text](#extensiontext). [Back to TOC](#table-of-contents) ## resty.openssl.x509.extension.dist_points Module to interact with CRL Distribution Points(DIST_POINT stack). [Back to TOC](#table-of-contents) ### dist_points.new **syntax**: *dp, err = dist_points.new()* Creates a new `dist_points` instance. [Back to TOC](#table-of-contents) ### dist_points.dup **syntax**: *dp, err = dist_points.dup(dist_points_ptr_cdata)* Duplicates a `STACK_OF(DIST_POINT)` to create a new `dist_points` instance. The function creates a new stack but won't duplicates elements in the stack. [Back to TOC](#table-of-contents) ### dist_points.istype **syntax**: *ok = dist_points.istype(table)* Returns `true` if table is an instance of `dist_points`. Returns `false` otherwise. [Back to TOC](#table-of-contents) ### dist_points:__metamethods **syntax**: *for i, obj in ipairs(dist_points)* **syntax**: *len = #dist_points* **syntax**: *obj = dist_points[i]* Access the underlying objects as it's a Lua table. Make sure your LuaJIT compiled with `-DLUAJIT_ENABLE_LUA52COMPAT` flag; otherwise use `all`, `each`, `index` and `count` instead. See also [functions for stack-like objects](#functions-for-stack-like-objects). Each object returned when iterrating dist_points instance is a [x509.altname](#restyopensslx509altname) instance. ```lua local x = x509.new(io.open("/path/to/a_cert_has_dist_points.crt"):read("*a")) local cdp = x:get_crl_distribution_points() local an = cdp[1] ngx.say(an:tostring()) -- or any other function for resty.openssl.x509.altname for _, an in ipairs(cdp) do ngx.say(an:tostring()) end ``` [Back to TOC](#table-of-contents) ## resty.openssl.x509.extension.info_access Module to interact with Authority Information Access data (AUTHORITY_INFO_ACCESS, ACCESS_DESCRIPTION stack). [Back to TOC](#table-of-contents) ### info_access.new **syntax**: *aia, err = info_access.new()* Creates a new `info_access` instance. [Back to TOC](#table-of-contents) ### info_access.dup **syntax**: *aia, err = info_access.dup(info_access_ptr_cdata)* Duplicates a `AUTHORITY_INFO_ACCESS` to create a new `info_access` instance. The function creates a new stack but won't duplicates elements in the stack. [Back to TOC](#table-of-contents) ### info_access.istype **syntax**: *ok = info_access.istype(table)* Returns `true` if table is an instance of `info_access`. Returns `false` otherwise. [Back to TOC](#table-of-contents) ### info_access:add **syntax**: *ok, err = info_access:add(x509)* Add a `x509` object to the info_access. The first argument must be a [resty.openssl.x509](#restyopensslx509) instance. [Back to TOC](#table-of-contents) ### info_access:__metamethods **syntax**: *for i, obj in ipairs(info_access)* **syntax**: *len = #info_access* **syntax**: *obj = info_access[i]* Access the underlying objects as it's a Lua table. Make sure your LuaJIT compiled with `-DLUAJIT_ENABLE_LUA52COMPAT` flag; otherwise use `all`, `each`, `index` and `count` instead. See also [functions for stack-like objects](#functions-for-stack-like-objects). Each object returned when iterrating dist_points instance is a table of [NID] type and values. ```lua local cjson = require("cjosn") local x509 = require("resty.openssl.x509") local crt = x509.new(io.open("/path/to/a_cert_has_info_access.crt"):read("*a")) local aia = crt:get_info_access() ngx.say(cjson.encode(aia[1])) -- outputs '[178,"URI","http:\/\/ocsp.starfieldtech.com\/"]' for _, a in ipairs(aia) do ngx.say(cjson.encode(a)) end ``` [Back to TOC](#table-of-contents) ## resty.openssl.x509.extensions Module to interact with X.509 Extension stack. [Back to TOC](#table-of-contents) ### extensions.new **syntax**: *ch, err = extensions.new()* Creates a new `extensions` instance. [Back to TOC](#table-of-contents) ### extensions.dup **syntax**: *ch, err = extensions.dup(extensions_ptr_cdata)* Duplicates a `STACK_OF(X509_EXTENSION)` to create a new `extensions` instance. The function creates a new stack but won't duplicates elements in the stack. [Back to TOC](#table-of-contents) ### extensions.istype **syntax**: *ok = extensions.istype(table)* Returns `true` if table is an instance of `extensions`. Returns `false` otherwise. [Back to TOC](#table-of-contents) ### extensions:add **syntax**: *ok, err = extensions:add(x509)* Add a `x509` object to the extensions. The first argument must be a [resty.openssl.x509](#restyopensslx509) instance. [Back to TOC](#table-of-contents) ### extensions:__metamethods **syntax**: *for i, obj in ipairs(extensions)* **syntax**: *len = #extensions* **syntax**: *obj = extensions[i]* Access the underlying objects as it's a Lua table. Make sure your LuaJIT compiled with `-DLUAJIT_ENABLE_LUA52COMPAT` flag; otherwise use `all`, `each`, `index` and `count` instead. See also [functions for stack-like objects](#functions-for-stack-like-objects). [Back to TOC](#table-of-contents) ## resty.openssl.x509.chain Module to interact with X.509 stack. [Back to TOC](#table-of-contents) ### chain.new **syntax**: *ch, err = chain.new()* Creates a new `chain` instance. [Back to TOC](#table-of-contents) ### chain.dup **syntax**: *ch, err = chain.dup(chain_ptr_cdata)* Duplicates a `STACK_OF(X509)` to create a new `chain` instance. The function creates a new stack and increases reference count for all elements by 1. But it won't duplicate the elements themselves. [Back to TOC](#table-of-contents) ### chain.istype **syntax**: *ok = chain.istype(table)* Returns `true` if table is an instance of `chain`. Returns `false` otherwise. [Back to TOC](#table-of-contents) ### chain:add **syntax**: *ok, err = chain:add(x509)* Add a `x509` object to the chain. The first argument must be a [resty.openssl.x509](#restyopensslx509) instance. [Back to TOC](#table-of-contents) ### chain:__metamethods **syntax**: *for i, obj in ipairs(chain)* **syntax**: *len = #chain* **syntax**: *obj = chain[i]* Access the underlying objects as it's a Lua table. Make sure your LuaJIT compiled with `-DLUAJIT_ENABLE_LUA52COMPAT` flag; otherwise use `all`, `each`, `index` and `count` instead. See also [functions for stack-like objects](#functions-for-stack-like-objects). [Back to TOC](#table-of-contents) ## resty.openssl.x509.store Module to interact with X.509 certificate store (X509_STORE). [Back to TOC](#table-of-contents) ### store.new **syntax**: *st, err = store.new(properties?)* Creates a new `store` instance. Staring from OpenSSL 3.0, this function accepts an optional `properties` parameter to explictly select provider to fetch algorithms. [Back to TOC](#table-of-contents) ### store.istype **syntax**: *ok = store.istype(table)* Returns `true` if table is an instance of `store`. Returns `false` otherwise. [Back to TOC](#table-of-contents) ### store:use_default **syntax**: *ok, err = store:use_default(properties?)* Loads certificates into the X509_STORE from the hardcoded default paths. Note that to load "default" CAs correctly, usually you need to install a CA certificates bundle. For example, the package in Debian/Ubuntu is called `ca-certificates`. Staring from OpenSSL 3.0, this function accepts an optional `properties` parameter to explictly select provider to fetch algorithms. [Back to TOC](#table-of-contents) ### store:add **syntax**: *ok, err = store:add(x509_or_crl, skip_set_crl_check_flags?)* Adds a X.509 or a CRL object into store. The argument must be a [resty.openssl.x509](#restyopensslx509) instance or a [resty.openssl.x509.crl](#restyopensslx509crl) instance. By default, adding a CRL object will automatically set the flag to store `X509_V_FLAG_CRL_CHECK`. Setting the second optional argument to `true` will skip settting the flags. [Back to TOC](#table-of-contents) ### store:load_file **syntax**: *ok, err = store:load_file(path, properties?)* Loads a X.509 certificate on file system into store. Staring from OpenSSL 3.0, this function accepts an optional `properties` parameter to explictly select provider to fetch algorithms. [Back to TOC](#table-of-contents) ### store:load_directory **syntax**: *ok, err = store:load_directory(path, properties?)* Loads a directory of X.509 certificates on file system into store. The certificates in the directory must be in hashed form, as documented in [X509_LOOKUP_hash_dir(3)](https://www.openssl.org/docs/manmaster/man3/X509_LOOKUP_hash_dir.html). Staring from OpenSSL 3.0, this function accepts an optional `properties` parameter to explictly select provider to fetch algorithms. [Back to TOC](#table-of-contents) ### store:set_purpose **syntax**: *ok, err = store:set_purpose(purpose)* Set the X509_STORE to match Key Usage and Extendend Key Usage when verifying the cert. Possible values are: ``` sslclient SSL client sslserver SSL server nssslserver Netscape SSL server smimesign S/MIME signing smimeencrypt S/MIME encryption crlsign CRL signing any Any Purpose ocsphelper OCSP helper timestampsign Time Stamp signing ``` Normally user should use `verify_method` parameter of [store:verify](#storeverify) unless the purpose is not included in the default verify methods. [Back to TOC](#table-of-contents) ### store:set_depth **syntax**: *ok, err = store:set_depth(depth)* Set the verify depth. ### store:set_flags **syntax**: *ok, err = store:set_flags(flag1, flag2, ...)* Set the verify flags, available via `store.verify_flags` table: ``` X509_V_FLAG_CB_ISSUER_CHECK = 0x0, -- Deprecated X509_V_FLAG_USE_CHECK_TIME = 0x2, X509_V_FLAG_CRL_CHECK = 0x4, X509_V_FLAG_CRL_CHECK_ALL = 0x8, X509_V_FLAG_IGNORE_CRITICAL = 0x10, X509_V_FLAG_X509_STRICT = 0x20, X509_V_FLAG_ALLOW_PROXY_CERTS = 0x40, X509_V_FLAG_POLICY_CHECK = 0x80, X509_V_FLAG_EXPLICIT_POLICY = 0x100, X509_V_FLAG_INHIBIT_ANY = 0x200, X509_V_FLAG_INHIBIT_MAP = 0x400, X509_V_FLAG_NOTIFY_POLICY = 0x800, X509_V_FLAG_EXTENDED_CRL_SUPPORT = 0x1000, X509_V_FLAG_USE_DELTAS = 0x2000, X509_V_FLAG_CHECK_SS_SIGNATURE = 0x4000, X509_V_FLAG_TRUSTED_FIRST = 0x8000, X509_V_FLAG_SUITEB_128_LOS_ONLY = 0x10000, X509_V_FLAG_SUITEB_192_LOS = 0x20000, X509_V_FLAG_SUITEB_128_LOS = 0x30000, X509_V_FLAG_PARTIAL_CHAIN = 0x80000, X509_V_FLAG_NO_ALT_CHAINS = 0x100000, X509_V_FLAG_NO_CHECK_TIME = 0x200000, ``` ```lua store:set_flags(store.verify_flags.X509_V_FLAG_PARTIAL_CHAIN) store:set_flags(store.verify_flags.X509_V_FLAG_PARTIAL_CHAIN, store.verify_flags.X509_V_FLAG_NO_CHECK_TIME) store:set_flags(store.verify_flags.X509_V_FLAG_PARTIAL_CHAIN + store.verify_flags.X509_V_FLAG_NO_CHECK_TIME) ``` See [X509_VERIFY_PARAM_set_flags(3)](https://www.openssl.org/docs/manmaster/man3/X509_VERIFY_PARAM_set_flags.html) for explanation of each flag. [Back to TOC](#table-of-contents) ### store:verify **syntax**: *chain, err = store:verify(x509, chain?, return_chain?, properties?, verify_method?, verify_flags?)* Verifies a X.509 object with the store. The first argument must be [resty.openssl.x509](#restyopensslx509) instance. Optionally accept a validation chain as second argument, which must be a [resty.openssl.x509.chain](#restyopensslx509chain) instance. If verification succeed, and `return_chain` is set to true, returns the proof of validation as a [resty.openssl.x509.chain](#restyopensslx509chain); otherwise returns `true` only. If verification failed, returns `nil` and error explaining the reason. Staring from OpenSSL 3.0, this function accepts an optional `properties` parameter to explictly select provider to fetch algorithms. `verify_method` can be set to use predefined verify parameters such as `"default"`, `"pkcs7"`, `"smime_sign"`, `"ssl_client"` and `"ssl_server"`. This set corresponding `purpose`, `trust` and couple of other defaults but **does not** override the parameters set from [store:set_purpose](#storeset_purpose). `verify_flags` paramter is the additional verify flags to be set. See [store:set_flags](#storeset_flags) for all available flags. [Back to TOC](#table-of-contents) ### store:check_revocation **syntax**: *ok, err = store:check_revocation(verified_chain, properties?)* Only does the revocation check. The first argument `verified_chain` must be a [resty.openssl.x509.chain](#restyopensslx509chain) instance which could be returned from `store_ctx:verify` or be built by yourself. Note the first cert needs to be the end entity certificate you want to check and the second cert needs to be its issuer. Staring from OpenSSL 3.0, this function accepts an optional `properties` parameter to explictly select provider to fetch algorithms. Returns `true` when the certificate isn't revoked, otherwise returns `nil` and error explaining the reason. [Back to TOC](#table-of-contents) ## resty.openssl.x509.revoked Module to interact with X509_REVOKED. [Back to TOC](#table-of-contents) ### revoked.new **syntax**: *ch, err = revoked.new(serial_number, time, reason)* Creates a new `revoked` instance. `serial_number` can be either a [resty.openssl.bn](#restyopensslbn) instance or a number. `time` and `reason` must be numbers. [Back to TOC](#table-of-contents) ### revoked.istype **syntax**: *ok = revoked.istype(table)* Returns `true` if table is an instance of `revoked`. Returns `false` otherwise. [Back to TOC](#table-of-contents) ## resty.openssl.ssl Module to interact with SSL connection. **This module is currently considered experimental.** **Note: to use this module in production, user is encouraged to compile [lua-resty-openssl-aux-module](https://github.com/fffonion/lua-resty-openssl-aux-module).** [Back to TOC](#table-of-contents) ### ssl.from_request **syntax**: *sess, err = ssl.from_request()* Wraps the `SSL*` instance from current downstream request. [Back to TOC](#table-of-contents) ### ssl.from_socket **syntax**: *sess, err = ssl.from_socket(sock)* Wraps the `SSL*` instance from a TCP cosocket, the cosocket must have already been called `sslhandshake`. [Back to TOC](#table-of-contents) ### ssl:get_peer_certificate **syntax**: *x509, err = ssl:get_peer_certificate()* Return the peer certificate as a [x509](#restyopensslx509) instance. Depending on the type of `ssl`, peer certificate means the server certificate on client side, or the client certificate on server side. This function should be called after SSL handshake. [Back to TOC](#table-of-contents) ### ssl:get_peer_cert_chain **syntax**: *chain, err = ssl:get_peer_certificate()* Return the whole peer certificate chain as a [x509.chain](#restyopensslx509chain) instance. Depending on the type of `ssl`, peer certificate means the server certificate on client side, or the client certificate on server side. This function should be called after SSL handshake. [Back to TOC](#table-of-contents) ### ssl:set_ciphersuites, ssl:set_cipher_list **syntax**: *ok, err = ssl:set_ciphersuites(cipher_suite)* **syntax**: *ok, err = ssl:set_cipher_list(cipher_list)* Set the cipher suites string used in handshake. Use `ssl:set_ciphersuites for TLSv1.3 and `ssl:set_cipher_list` for lower. This function should be called before SSL handshake; for server this means this function is only effective in `ssl_certificate_by` or `ssl_client_hello_by` phases. [Back to TOC](#table-of-contents) ### ssl:get_ciphers **syntax**: *ciphers, err = ssl:get_ciphers()* Get the cipher list string used in handshake as a string. [Back to TOC](#table-of-contents) ### ssl:get_cipher_name **syntax**: *cipher_name, err = ssl:get_cipher_name()* Get the negotiated cipher name as a string. This function should be called after SSL handshake. [Back to TOC](#table-of-contents) ### ssl:set_timeout **syntax**: *ok, err = ssl:set_timeout(tm)* Set the timeout value for current session in seconds `tm`. [Back to TOC](#table-of-contents) ### ssl:get_timeout **syntax**: *tm, err = ssl:set_timeout(tm)* Get the timeout value for current session in seconds. [Back to TOC](#table-of-contents) ### ssl:set_verify **syntax**: *ok, err = ssl:set_verify(mode)* Set the verify mode in current session. Available modes are: ``` ssl.SSL_VERIFY_NONE = 0x00, ssl.SSL_VERIFY_PEER = 0x01, ssl.SSL_VERIFY_FAIL_IF_NO_PEER_CERT = 0x02, ssl.SSL_VERIFY_CLIENT_ONCE = 0x04, ssl.SSL_VERIFY_POST_HANDSHAKE = 0x08, ``` This function should be called before SSL handshake; for server this means this function is only effective in `ssl_certificate_by` or `ssl_client_hello_by` phases. [Back to TOC](#table-of-contents) ### ssl:add_client_ca **syntax**: *ok, err = ssl:add_client_ca(x509)* Add the CA name extracted from `x509` to the list of CAs sent to the client when requesting a client certificate. `x509` is a [x509](#resty.openssl.x509) instance. This function doesn't affect the verification result of client certificate. This function should be called before SSL handshake; for server this means this function is only effective in `ssl_certificate_by` or `ssl_client_hello_by` phases. [Back to TOC](#table-of-contents) ### ssl:set_options **syntax**: *bitmask, err = ssl:set_options(option, ...)* Set one or more options in current session. Available options are:
SSL options ``` ssl.SSL_OP_NO_EXTENDED_MASTER_SECRET = 0x00000001, ssl.SSL_OP_CLEANSE_PLAINTEXT = 0x00000002, ssl.SSL_OP_LEGACY_SERVER_CONNECT = 0x00000004, ssl.SSL_OP_TLSEXT_PADDING = 0x00000010, ssl.SSL_OP_SAFARI_ECDHE_ECDSA_BUG = 0x00000040, ssl.SSL_OP_IGNORE_UNEXPECTED_EOF = 0x00000080, ssl.SSL_OP_DISABLE_TLSEXT_CA_NAMES = 0x00000200, ssl.SSL_OP_ALLOW_NO_DHE_KEX = 0x00000400, ssl.SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS = 0x00000800, ssl.SSL_OP_NO_QUERY_MTU = 0x00001000, ssl.SSL_OP_COOKIE_EXCHANGE = 0x00002000, ssl.SSL_OP_NO_TICKET = 0x00004000, ssl.SSL_OP_CISCO_ANYCONNECT = 0x00008000, ssl.SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION = 0x00010000, ssl.SSL_OP_NO_COMPRESSION = 0x00020000, ssl.SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION = 0x00040000, ssl.SSL_OP_NO_ENCRYPT_THEN_MAC = 0x00080000, ssl.SSL_OP_ENABLE_MIDDLEBOX_COMPAT = 0x00100000, ssl.SSL_OP_PRIORITIZE_CHACHA = 0x00200000, ssl.SSL_OP_CIPHER_SERVER_PREFERENCE = 0x00400000, ssl.SSL_OP_TLS_ROLLBACK_BUG = 0x00800000, ssl.SSL_OP_NO_ANTI_REPLAY = 0x01000000, ssl.SSL_OP_NO_SSLv3 = 0x02000000, ssl.SSL_OP_NO_TLSv1 = 0x04000000, ssl.SSL_OP_NO_TLSv1_2 = 0x08000000, ssl.SSL_OP_NO_TLSv1_1 = 0x10000000, ssl.SSL_OP_NO_TLSv1_3 = 0x20000000, ssl.SSL_OP_NO_DTLSv1 = 0x04000000, ssl.SSL_OP_NO_DTLSv1_2 = 0x08000000, ssl.SSL_OP_NO_RENEGOTIATION = 0x40000000, ssl.SSL_OP_CRYPTOPRO_TLSEXT_BUG = 0x80000000, ```
Multiple options can be passed in seperatedly, or in a bitwise or bitmask. ```lua assert(ssl:set_options(bit.bor(ssl.SSL_OP_NO_TLSv1_1, ssl.SSL_OP_NO_TLSv1_2))) -- same as assert(ssl:set_options(ssl.SSL_OP_NO_TLSv1_1, ssl.SSL_OP_NO_TLSv1_2)) ``` Returns the options of current session in bitmask. This function should be called before SSL handshake; for server this means this function is only effective in `ssl_client_hello_by` phase. [Back to TOC](#table-of-contents) ### ssl:get_options **syntax**: *bitmask, err = ssl:get_options(readable?)* Get the options for current session. If `readable` is not set or set to `false`, the function return the bit mask for all optinos; if `readable` is set to `true,` the function returns a sorted Lua table containing literals for all options. [Back to TOC](#table-of-contents) ### ssl:clear_options **syntax**: *bitmask, err = ssl:clear_options(option, ...)* Clear one or more options in current session. Available options are same as that in [ssl:set_options](#sslset_options). Multiple options can be passed in seperatedly, or in a bitwise or bitmask. ```lua assert(ssl:clear_options(bit.bor(ssl.SSL_OP_NO_TLSv1_1, ssl.SSL_OP_NO_TLSv1_2))) -- same as assert(ssl:clear_options(ssl.SSL_OP_NO_TLSv1_1, ssl.SSL_OP_NO_TLSv1_2)) ``` Returns the options of current session in bitmask. This function should be called before SSL handshake; for server this means this function is only effective in `ssl_client_hello_by` phase. [Back to TOC](#table-of-contents) ### ssl:set_protocols **syntax**: *bitmask, err = ssl:set_protocols(protocol, ...)* Set avaialable protocols for handshake, this is a convenient function that calls [ssl:set_options](#sslset_options) and [ssl:clear_options](#sslclear_options) to set appropriate options. Returns the options of current session in bitmask. This function should be called before SSL handshake; for server this means this function is only effective in `ssl_client_hello_by` phase. ```lua assert(ssl:set_protocols("TLSv1.1", "TLSv1.2")) -- same as assert(ssl:set_options(ssl.SSL_OP_NO_SSL_MASK)) assert(ssl:clear_options(ssl.SSL_OP_NO_TLSv1_1, ssl.SSL_OP_NO_TLSv1_2)) ``` [Back to TOC](#table-of-contents) ## resty.openssl.ssl_ctx Module to interact with SSL_CTX context. **This module is currently considered experimental.** **Note: to use this module in production, user is encouraged to compile [lua-resty-openssl-aux-module](https://github.com/fffonion/lua-resty-openssl-aux-module).** [Back to TOC](#table-of-contents) ### ssl_ctx.from_request **syntax**: *ctx, err = ssl_ctx.from_request()* Wraps the `SSL_CTX*` instance from current downstream request. [Back to TOC](#table-of-contents) ### ssl_ctx.from_socket **syntax**: *sess, err = ssl_ctx.from_socket(sock)* Wraps the `SSL_CTX*` instance from a TCP cosocket, the cosocket must have already been called `sslhandshake`. [Back to TOC](#table-of-contents) ### ssl_ctx:set_alpns **syntax**: *ok, err = ssl_ctx:set_alpns(alpn, ...)* Set the ALPN list to be negotiated with peer. Each `alpn` is the plaintext literal for the protocol, like `"h2"`. [Back to TOC](#table-of-contents) ## Functions for stack-like objects [Back to TOC](#table-of-contents) ### metamethods **syntax**: *for k, obj in pairs(x)* **syntax**: *for k, obj in ipairs(x)* **syntax**: *len = #x* **syntax**: *obj = x[i]* Access the underlying objects as it's a Lua table. Make sure your LuaJIT compiled with `-DLUAJIT_ENABLE_LUA52COMPAT` flag. Each object may only support either `pairs` or `ipairs`. Index is 1-based. ```lua local name, err = require("resty.openssl.x509.name").new() local _, err = name:add("CN", "example.com") for k, obj in pairs(name) do ngx.say(k, ":", require("cjson").encode(obj)) end -- outputs 'CN: {"sn":"CN","id":"2.5.4.3","nid":13,"blob":"3.example.com","ln":"commonName"}' ``` [Back to TOC](#table-of-contents) ### each **syntax**: *iter = x:each()* Return an iterator to traverse objects. Use this while `LUAJIT_ENABLE_LUA52COMPAT` is not enabled. ```lua local name, err = require("resty.openssl.x509.name").new() local _, err = name:add("CN", "example.com") local iter = name:each() while true do local k, obj = iter() if not k then break end end ``` [Back to TOC](#table-of-contents) ### all **syntax**: *objs, err = x:all()* Returns all objects in the table. Use this while `LUAJIT_ENABLE_LUA52COMPAT` is not enabled. [Back to TOC](#table-of-contents) ### count **syntax**: *len = x:count()* Returns count of objects of the table. Use this while `LUAJIT_ENABLE_LUA52COMPAT` is not enabled. [Back to TOC](#table-of-contents) ### index **syntax**: *obj = x:index(i)* Returns objects at index of `i` of the table, index is 1-based. If index is out of bound, `nil` is returned. [Back to TOC](#table-of-contents) General rules on garbage collection ==== - When a type is added or returned to another type, it's internal cdata is always copied. ```lua local name = require("resty.openssl.x509.name"):add("CN", "example.com") local x509 = require("resty.openssl.x509").new() -- `name` is copied when added to x509 x509:set_subject_name(name) name:add("L", "Mars") -- subject_name in x509 will not be modified ``` - The creator set the GC handler; the user must not free it. - For a stack: - If it's created by `new()`: set GC handler to sk_TYPE_pop_free - The gc handler for elements being added to stack should not be set. Instead, rely on the gc handler of the stack to free each individual elements. - If it's created by `dup()` (shallow copy): - If elements support reference counter (like X509): increase ref count for all elements by 1; set GC handler to sk_TYPE_pop_free. - If not, set GC handler to sk_free - Additionally, the stack duplicates the element when it's added to stack, a GC handler for the duplicate must be set. But a reference should be kept in Lua land to prevent premature gc of individual elements. (See x509.altname). - Shallow copy for stack is fine because in current design user can't modify the element in the stack directly. Each elemente is duplicated when added to stack and when returned. [Back to TOC](#table-of-contents) ## Generic EVP parameter getter/setter Starting from OpenSSL 3.0, this library provides a genric interface to get and set abitrary parameters from underlying implementation. This works for [cipher](#resty.openssl.cipher), [pkey](#resty.openssl.pkey), [digest](#resty.openssl.digest), [mac](#resty.openssl.mac) and [kdf](#resty.openssl.kdf). Some can be used to provide equal results with existing functions, for example the following code produces same result. ```lua local pkey = require("resty.openssl.pkey").new({ type = "EC" }) pkey:get_param("priv", nil, "bn") == pkey:get_parameters().private local cipher = require("resty.openssl.cipher").new("aes-256-gcm") cipher:encrypt(string.rep("0", 32), string.rep("0", "12"), "secret", false, "aad") cipher:get_param("tag", 16) == cipher:get_aead_tag() ``` [Back to TOC](#table-of-contents) ### gettable_params **syntax**: *schema, err = x:gettable_params(raw?)* Returns the readable schema as a Lua table for all gettable params. When `raw` is set to true, the function returns the raw schema instead. [Back to TOC](#table-of-contents) ### settable_params **syntax**: *schema, err = x:settable_params(raw?)* Returns the readable schema as a Lua table for all settable params. When `raw` is set to true, the function returns the raw schema instead. ```lua local c = require("resty.openssl.cipher").new("aes-256-gcm") print(cjson.encode(c:settable_params())) -- outputs [["ivlen","unsigned integer (max 8 bytes large)"],["tag","octet string (arbitrary size)"],["tlsaad","octet string (arbitrary size)"],["tlsivfixed","octet string (arbitrary size)"],["tlsivinv","octet string (arbitrary size)"]] print(cjson.encode(c:gettable_params())) -- outputs [["keylen","unsigned integer (max 8 bytes large)"],["ivlen","unsigned integer (max 8 bytes large)"],["taglen","unsigned integer (max 8 bytes large)"],["iv","octet string (arbitrary size)"],["updated-iv","octet string (arbitrary size)"],["tag","octet string (arbitrary size)"],["tlsaadpad","unsigned integer (max 8 bytes large)"],["tlsivgen","octet string (arbitrary size)"]] ``` [Back to TOC](#table-of-contents) ### get_param **syntax**: *value, err = x:get_param(key, want_size?, want_type?)* Read the param `key` and return its value. The return value is a Lua number or a string. Certain params requires exact size to be set, in such case, `want_size` should be specified; if `want_size` is not specified and, the library use a buffer of 100 bytes to hold the return value. Certain params returns a special type, user should explictly set `want_type` as a string to correctly decode them. Currently `want_type` can only be `"bn"` or unset. Note it may also be necessary to increase temporary buffer size `want_size` when `want_type` is `"bn"`. ```lua local c = require("resty.openssl.cipher").new("aes-256-gcm") print(c:get_param("taglen")) -- outputs 16 print(c:get_param("tag")) -- returns error, tag must have a explict size print(c:get_param("tag", 16)) -- outputs the tag local p = require("resty.openssl.pkey").new()) print(p:get_param("d"):to_hex()) -- returns error, d (private exponent) is a BIGNUM print(p:get_param("d", 256, "bn"):to_hex()) -- returns d as resty.openssl.bn instance ``` [Back to TOC](#table-of-contents) ### set_params **syntax**: *ok, err = x:set_params(params)* Set params passed in with Lua table `params`. The library does limited type check, user is responsible for validity of input. ```lua local k = require("resty.openssl.kdf").new("HKDF") k:set_params({ digest = "md5", salt = "salt", info = "some info", mode = kdf.HKDEF_MODE_EXPAND_ONLY, -- as HKDF also accepts mode as string, use the literal below also works -- mode = "EXPAND_ONLY" })) ``` [Back to TOC](#table-of-contents) Code generation ==== Lots of functions and tests for X509, CSR and CRL are generated from templates under [scripts](https://github.com/fffonion/lua-resty-openssl/tree/master/scripts) directory. Those functions and tests are either commented with `AUTO GENERATED` or `AUTOGEN`. When making changes to them, please update the template under `scripts/templates` instead. Then regenerate them again. ``` cd scripts pip3 install -r requirements.txt python3 ./x509_autogen.py ``` [Back to TOC](#table-of-contents) Compatibility ==== Although only a small combinations of CPU arch and OpenSSL version are tested, the library should function well as long as the linked OpenSSL library is API compatible. This means the same name of functions are exported with same argument types. For OpenSSL 1.0.2 series however, binary/ABI compatibility must be ensured as some struct members are accessed directly. They are accessed by memory offset in assembly. OpenSSL [keeps ABI/binary compatibility](https://wiki.openssl.org/index.php/Versioning) with minor releases or letter releases. So all structs offsets and macro constants are kept same. If you plan to use this library on an untested version of OpenSSL (like custom builds or pre releases), [this](https://abi-laboratory.pro/index.php?view=timeline&l=openssl) can be a good source to consult. [Back to TOC](#table-of-contents) Credits ==== This project receives contribution from following developers: - [@nasrullo](https://github.com/nasrullo) - [@vinayakhulawale](https://github.com/vinayakhulawale) [Back to TOC](#table-of-contents) Copyright and License ===================== This module is licensed under the BSD license. Copyright (C) 2019-2023, by fffonion . All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. [Back to TOC](#table-of-contents) See Also ======== * [luaossl](https://github.com/wahern/luaossl) * [API/ABI changes review for OpenSSL](https://abi-laboratory.pro/index.php?view=timeline&l=openssl) * [OpenSSL API manual](https://www.openssl.org/docs/man3.1/man3/) [Back to TOC](#table-of-contents) [NID]: https://github.com/openssl/openssl/blob/master/include/openssl/obj_mac.h [RFC 2246]: https://tools.ietf.org/html/rfc2246 [RFC 2898]: https://tools.ietf.org/html/rfc2898 [RFC 5246]: https://tools.ietf.org/html/rfc5246 [RFC 5869]: https://tools.ietf.org/html/rfc5869 [RFC 7914]: https://tools.ietf.org/html/rfc7914 [NIST SP 800-132]: https://nvlpubs.nist.gov/nistpubs/Legacy/SP/nistspecialpublication800-132.pdf [NIST SP 800-135 r1]: https://nvlpubs.nist.gov/nistpubs/Legacy/SP/nistspecialpublication800-135r1.pdf