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/*
Copyright 2014 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package cert
import (
"crypto/rsa"
"crypto/x509"
"encoding/pem"
"errors"
"fmt"
)
// EncodePublicKeyPEM returns PEM-endcode public data
func EncodePublicKeyPEM(key *rsa.PublicKey) ([]byte, error) {
der, err := x509.MarshalPKIXPublicKey(key)
if err != nil {
return []byte{}, err
}
block := pem.Block{
Type: "PUBLIC KEY",
Bytes: der,
}
return pem.EncodeToMemory(&block), nil
}
// EncodePrivateKeyPEM returns PEM-encoded private key data
func EncodePrivateKeyPEM(key *rsa.PrivateKey) []byte {
block := pem.Block{
Type: "RSA PRIVATE KEY",
Bytes: x509.MarshalPKCS1PrivateKey(key),
}
return pem.EncodeToMemory(&block)
}
// EncodeCertPEM returns PEM-endcoded certificate data
func EncodeCertPEM(cert *x509.Certificate) []byte {
block := pem.Block{
Type: "CERTIFICATE",
Bytes: cert.Raw,
}
return pem.EncodeToMemory(&block)
}
// ParsePrivateKeyPEM returns a private key parsed from a PEM block in the supplied data.
// Recognizes PEM blocks for "EC PRIVATE KEY" and "RSA PRIVATE KEY"
func ParsePrivateKeyPEM(keyData []byte) (interface{}, error) {
for {
var privateKeyPemBlock *pem.Block
privateKeyPemBlock, keyData = pem.Decode(keyData)
if privateKeyPemBlock == nil {
// we read all the PEM blocks and didn't recognize one
return nil, fmt.Errorf("no private key PEM block found")
}
switch privateKeyPemBlock.Type {
case "EC PRIVATE KEY":
return x509.ParseECPrivateKey(privateKeyPemBlock.Bytes)
case "RSA PRIVATE KEY":
return x509.ParsePKCS1PrivateKey(privateKeyPemBlock.Bytes)
}
}
}
// ParseCertsPEM returns the x509.Certificates contained in the given PEM-encoded byte array
// Returns an error if a certificate could not be parsed, or if the data does not contain any certificates
func ParseCertsPEM(pemCerts []byte) ([]*x509.Certificate, error) {
ok := false
certs := []*x509.Certificate{}
for len(pemCerts) > 0 {
var block *pem.Block
block, pemCerts = pem.Decode(pemCerts)
if block == nil {
break
}
// Only use PEM "CERTIFICATE" blocks without extra headers
if block.Type != "CERTIFICATE" || len(block.Headers) != 0 {
continue
}
cert, err := x509.ParseCertificate(block.Bytes)
if err != nil {
return certs, err
}
certs = append(certs, cert)
ok = true
}
if !ok {
return certs, errors.New("could not read any certificates")
}
return certs, nil
}
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