/*
Copyright IBM Corp. 2016 All Rights Reserved.

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 bccsp

import "io"

// AES128KeyGenOpts contains options for AES key generation at 128 security level
type AES128KeyGenOpts struct {
	Temporary bool
}

// Algorithm returns the key generation algorithm identifier (to be used).
func (opts *AES128KeyGenOpts) Algorithm() string {
	return AES128
}

// Ephemeral returns true if the key to generate has to be ephemeral,
// false otherwise.
func (opts *AES128KeyGenOpts) Ephemeral() bool {
	return opts.Temporary
}

// AES192KeyGenOpts contains options for AES key generation at 192  security level
type AES192KeyGenOpts struct {
	Temporary bool
}

// Algorithm returns the key generation algorithm identifier (to be used).
func (opts *AES192KeyGenOpts) Algorithm() string {
	return AES192
}

// Ephemeral returns true if the key to generate has to be ephemeral,
// false otherwise.
func (opts *AES192KeyGenOpts) Ephemeral() bool {
	return opts.Temporary
}

// AES256KeyGenOpts contains options for AES key generation at 256 security level
type AES256KeyGenOpts struct {
	Temporary bool
}

// Algorithm returns the key generation algorithm identifier (to be used).
func (opts *AES256KeyGenOpts) Algorithm() string {
	return AES256
}

// Ephemeral returns true if the key to generate has to be ephemeral,
// false otherwise.
func (opts *AES256KeyGenOpts) Ephemeral() bool {
	return opts.Temporary
}

// AESCBCPKCS7ModeOpts contains options for AES encryption in CBC mode
// with PKCS7 padding.
// Notice that both IV and PRNG can be nil. In that case, the BCCSP implementation
// is supposed to sample the IV using a cryptographic secure PRNG.
// Notice also that either IV or PRNG can be different from nil.
type AESCBCPKCS7ModeOpts struct {
	// IV is the initialization vector to be used by the underlying cipher.
	// The length of IV must be the same as the Block's block size.
	// It is used only if different from nil.
	IV []byte
	// PRNG is an instance of a PRNG to be used by the underlying cipher.
	// It is used only if different from nil.
	PRNG io.Reader
}