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:
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 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
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 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
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 *    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
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 *    prior written permission. For written permission, please contact
 *    openssl-core@openssl.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
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 * 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
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 * ====================================================================
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 */

#ifndef OPENSSL_NO_AES
#include <openssl/evp.h>
#include <openssl/err.h>
#include <string.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,
		       0, aes_init_key, NULL, 
		       EVP_CIPHER_set_asn1_iv,
		       EVP_CIPHER_get_asn1_iv,
		       NULL)
IMPLEMENT_BLOCK_CIPHER(aes_192, ks, AES, EVP_AES_KEY,
		       NID_aes_192, 16, 24, 16, 128,
		       0, aes_init_key, NULL, 
		       EVP_CIPHER_set_asn1_iv,
		       EVP_CIPHER_get_asn1_iv,
		       NULL)
IMPLEMENT_BLOCK_CIPHER(aes_256, ks, AES, EVP_AES_KEY,
		       NID_aes_256, 16, 32, 16, 128,
		       0, aes_init_key, NULL, 
		       EVP_CIPHER_set_asn1_iv,
		       EVP_CIPHER_get_asn1_iv,
		       NULL)

#define IMPLEMENT_CFBR(keysize,cbits) \
	BLOCK_CIPHER_func_cfb(aes_##keysize,AES,cbits,EVP_AES_KEY,ks) \
	BLOCK_CIPHER_def_cfb(aes_##keysize,EVP_AES_KEY, \
			     NID_aes_##keysize, keysize/8, 16, cbits, \
			     0, aes_init_key, NULL, \
			     EVP_CIPHER_set_asn1_iv, \
			     EVP_CIPHER_get_asn1_iv, \
			     NULL)

IMPLEMENT_CFBR(128,1)
IMPLEMENT_CFBR(192,1)
IMPLEMENT_CFBR(256,1)

IMPLEMENT_CFBR(128,8)
IMPLEMENT_CFBR(192,8)
IMPLEMENT_CFBR(256,8)

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