173 lines
3.6 KiB
C
173 lines
3.6 KiB
C
/*
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* Copyright (c) 2006 - 2008 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <config.h>
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#define HC_DEPRECATED
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#include <sys/types.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <assert.h>
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#include <evp.h>
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#include <krb5-types.h>
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#include <aes.h>
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/*
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*
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*/
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static int
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aes_init(EVP_CIPHER_CTX *ctx,
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const unsigned char * key,
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const unsigned char * iv,
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int encp)
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{
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AES_KEY *k = ctx->cipher_data;
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if (ctx->encrypt)
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AES_set_encrypt_key(key, ctx->cipher->key_len * 8, k);
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else
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AES_set_decrypt_key(key, ctx->cipher->key_len * 8, k);
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return 1;
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}
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static int
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aes_do_cipher(EVP_CIPHER_CTX *ctx,
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unsigned char *out,
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const unsigned char *in,
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unsigned int size)
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{
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AES_KEY *k = ctx->cipher_data;
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AES_cbc_encrypt(in, out, size, k, ctx->iv, ctx->encrypt);
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return 1;
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}
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static int
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aes_cleanup(EVP_CIPHER_CTX *ctx)
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{
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memset(ctx->cipher_data, 0, sizeof(AES_KEY));
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return 1;
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}
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/**
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* The AES-128 cipher type (hcrypto)
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*
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* @return the AES-128 EVP_CIPHER pointer.
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*
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* @ingroup hcrypto_evp
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*/
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const EVP_CIPHER *
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EVP_hcrypto_aes_128_cbc(void)
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{
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static const EVP_CIPHER aes_128_cbc = {
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0,
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16,
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16,
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16,
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EVP_CIPH_CBC_MODE,
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aes_init,
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aes_do_cipher,
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aes_cleanup,
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sizeof(AES_KEY),
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NULL,
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NULL,
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NULL,
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NULL
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};
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return &aes_128_cbc;
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}
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/**
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* The AES-192 cipher type (hcrypto)
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*
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* @return the AES-192 EVP_CIPHER pointer.
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*
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* @ingroup hcrypto_evp
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*/
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const EVP_CIPHER *
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EVP_hcrypto_aes_192_cbc(void)
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{
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static const EVP_CIPHER aes_192_cbc = {
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0,
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16,
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24,
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16,
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EVP_CIPH_CBC_MODE,
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aes_init,
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aes_do_cipher,
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aes_cleanup,
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sizeof(AES_KEY),
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NULL,
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NULL,
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NULL,
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NULL
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};
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return &aes_192_cbc;
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}
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/**
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* The AES-256 cipher type (hcrypto)
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*
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* @return the AES-256 EVP_CIPHER pointer.
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*
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* @ingroup hcrypto_evp
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*/
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const EVP_CIPHER *
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EVP_hcrypto_aes_256_cbc(void)
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{
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static const EVP_CIPHER aes_256_cbc = {
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0,
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16,
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32,
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16,
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EVP_CIPH_CBC_MODE,
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aes_init,
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aes_do_cipher,
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aes_cleanup,
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sizeof(AES_KEY),
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NULL,
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NULL,
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NULL,
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NULL
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};
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return &aes_256_cbc;
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}
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