openssl/crypto/evp/e_aes.c

/* ====================================================================
 * Copyright (c) 2001 The OpenSSL Project.  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. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    openssl-core@openssl.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED 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 OpenSSL PROJECT OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 *
 */

#include <openssl/opensslconf.h>
#ifndef OPENSSL_NO_AES
# include <openssl/evp.h>
# include <openssl/err.h>
# include <string.h>
# include <assert.h>
# include <openssl/aes.h>
# include "evp_locl.h"

static int aes_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
                        const unsigned char *iv, int enc);

typedef struct {
    AES_KEY ks;
} EVP_AES_KEY;

# define data(ctx)       EVP_C_DATA(EVP_AES_KEY,ctx)

IMPLEMENT_BLOCK_CIPHER(aes_128, ks, AES, EVP_AES_KEY,
                       NID_aes_128, 16, 16, 16, 128,
                       EVP_CIPH_FLAG_FIPS | EVP_CIPH_FLAG_DEFAULT_ASN1,
                       aes_init_key, NULL, NULL, NULL, NULL)
    IMPLEMENT_BLOCK_CIPHER(aes_192, ks, AES, EVP_AES_KEY,
                       NID_aes_192, 16, 24, 16, 128,
                       EVP_CIPH_FLAG_FIPS | EVP_CIPH_FLAG_DEFAULT_ASN1,
                       aes_init_key, NULL, NULL, NULL, NULL)
    IMPLEMENT_BLOCK_CIPHER(aes_256, ks, AES, EVP_AES_KEY,
                       NID_aes_256, 16, 32, 16, 128,
                       EVP_CIPH_FLAG_FIPS | EVP_CIPH_FLAG_DEFAULT_ASN1,
                       aes_init_key, NULL, NULL, NULL, NULL)
# define IMPLEMENT_AES_CFBR(ksize,cbits,flags)   IMPLEMENT_CFBR(aes,AES,EVP_AES_KEY,ks,ksize,cbits,16,flags)
    IMPLEMENT_AES_CFBR(128, 1, EVP_CIPH_FLAG_FIPS)
    IMPLEMENT_AES_CFBR(192, 1, EVP_CIPH_FLAG_FIPS)
    IMPLEMENT_AES_CFBR(256, 1, EVP_CIPH_FLAG_FIPS)

    IMPLEMENT_AES_CFBR(128, 8, EVP_CIPH_FLAG_FIPS)
    IMPLEMENT_AES_CFBR(192, 8, EVP_CIPH_FLAG_FIPS)
    IMPLEMENT_AES_CFBR(256, 8, EVP_CIPH_FLAG_FIPS)

static int aes_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
                        const unsigned char *iv, int enc)
{
    int ret;

    if ((ctx->cipher->flags & EVP_CIPH_MODE) == EVP_CIPH_CFB_MODE
        || (ctx->cipher->flags & EVP_CIPH_MODE) == EVP_CIPH_OFB_MODE || enc)
        ret = AES_set_encrypt_key(key, ctx->key_len * 8, ctx->cipher_data);
    else
        ret = AES_set_decrypt_key(key, ctx->key_len * 8, ctx->cipher_data);

    if (ret < 0) {
        EVPerr(EVP_F_AES_INIT_KEY, EVP_R_AES_KEY_SETUP_FAILED);
        return 0;
    }

    return 1;
}

#endif