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/*
* Copyright (c) 2006 - 2008 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. 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.
*
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE 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 INSTITUTE 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.
*/
#include <config.h>
#define HC_DEPRECATED
#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <evp.h>
#include <krb5-types.h>
#include <aes.h>
/*
*
*/
static int
aes_init(EVP_CIPHER_CTX *ctx,
const unsigned char * key,
const unsigned char * iv,
int encp)
{
AES_KEY *k = ctx->cipher_data;
if (ctx->encrypt)
AES_set_encrypt_key(key, ctx->cipher->key_len * 8, k);
else
AES_set_decrypt_key(key, ctx->cipher->key_len * 8, k);
return 1;
}
static int
aes_do_cipher(EVP_CIPHER_CTX *ctx,
unsigned char *out,
const unsigned char *in,
unsigned int size)
{
AES_KEY *k = ctx->cipher_data;
AES_cbc_encrypt(in, out, size, k, ctx->iv, ctx->encrypt);
return 1;
}
static int
aes_cleanup(EVP_CIPHER_CTX *ctx)
{
memset(ctx->cipher_data, 0, sizeof(AES_KEY));
return 1;
}
/**
* The AES-128 cipher type (hcrypto)
*
* @return the AES-128 EVP_CIPHER pointer.
*
* @ingroup hcrypto_evp
*/
const EVP_CIPHER *
EVP_hcrypto_aes_128_cbc(void)
{
static const EVP_CIPHER aes_128_cbc = {
0,
16,
16,
16,
EVP_CIPH_CBC_MODE,
aes_init,
aes_do_cipher,
aes_cleanup,
sizeof(AES_KEY),
NULL,
NULL,
NULL,
NULL
};
return &aes_128_cbc;
}
/**
* The AES-192 cipher type (hcrypto)
*
* @return the AES-192 EVP_CIPHER pointer.
*
* @ingroup hcrypto_evp
*/
const EVP_CIPHER *
EVP_hcrypto_aes_192_cbc(void)
{
static const EVP_CIPHER aes_192_cbc = {
0,
16,
24,
16,
EVP_CIPH_CBC_MODE,
aes_init,
aes_do_cipher,
aes_cleanup,
sizeof(AES_KEY),
NULL,
NULL,
NULL,
NULL
};
return &aes_192_cbc;
}
/**
* The AES-256 cipher type (hcrypto)
*
* @return the AES-256 EVP_CIPHER pointer.
*
* @ingroup hcrypto_evp
*/
const EVP_CIPHER *
EVP_hcrypto_aes_256_cbc(void)
{
static const EVP_CIPHER aes_256_cbc = {
0,
16,
32,
16,
EVP_CIPH_CBC_MODE,
aes_init,
aes_do_cipher,
aes_cleanup,
sizeof(AES_KEY),
NULL,
NULL,
NULL,
NULL
};
return &aes_256_cbc;
}
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