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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 * 2. Redistributions in binary form must reproduce the above copyright
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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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 *    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.
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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
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 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
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 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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 * ====================================================================
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 */

#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,
		       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_AES_CFBR(ksize,cbits)	IMPLEMENT_CFBR(aes,AES,EVP_AES_KEY,ks,ksize,cbits,16)

IMPLEMENT_AES_CFBR(128,1)
IMPLEMENT_AES_CFBR(192,1)
IMPLEMENT_AES_CFBR(256,1)

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

static int aes_counter (EVP_CIPHER_CTX *ctx, unsigned char *out,
		const unsigned char *in, size_t len)
{
	AES_ctr128_encrypt (in,out,len,
		&((EVP_AES_KEY *)ctx->cipher_data)->ks,
		ctx->iv,ctx->buf,&ctx->num);
	return 1;
}

static const EVP_CIPHER aes_128_ctr_cipher=
	{
	NID_aes_128_ctr,1,16,16,
	EVP_CIPH_VARIABLE_LENGTH|EVP_CIPH_CUSTOM_IV,
	aes_init_key,
	aes_counter,
	NULL,
	sizeof(EVP_AES_KEY),
	NULL,
	NULL,
	NULL,
	NULL
	};

const EVP_CIPHER *EVP_aes_128_ctr (void)
{	return &aes_128_ctr_cipher;	}

static const EVP_CIPHER aes_192_ctr_cipher=
	{
	NID_aes_192_ctr,1,24,16,
	EVP_CIPH_VARIABLE_LENGTH|EVP_CIPH_CUSTOM_IV,
	aes_init_key,
	aes_counter,
	NULL,
	sizeof(EVP_AES_KEY),
	NULL,
	NULL,
	NULL,
	NULL
	};

const EVP_CIPHER *EVP_aes_192_ctr (void)
{	return &aes_192_ctr_cipher;	}

static const EVP_CIPHER aes_256_ctr_cipher=
	{
	NID_aes_256_ctr,1,32,16,
	EVP_CIPH_VARIABLE_LENGTH|EVP_CIPH_CUSTOM_IV,
	aes_init_key,
	aes_counter,
	NULL,
	sizeof(EVP_AES_KEY),
	NULL,
	NULL,
	NULL,
	NULL
	};

const EVP_CIPHER *EVP_aes_256_ctr (void)
{	return &aes_256_ctr_cipher;	}

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_ECB_MODE
	    || (ctx->cipher->flags & EVP_CIPH_MODE) == EVP_CIPH_CBC_MODE)
	    && !enc) 
		ret=AES_set_decrypt_key(key, ctx->key_len * 8, ctx->cipher_data);
	else
		ret=AES_set_encrypt_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;
		}

	if (ctx->cipher->flags&EVP_CIPH_CUSTOM_IV)
		{
		if (iv!=NULL)
			memcpy (ctx->iv,iv,ctx->cipher->iv_len);
		else	{
			EVPerr(EVP_F_AES_INIT_KEY,EVP_R_AES_IV_SETUP_FAILED);
			return 0;
			}
		}

	return 1;
	}

#endif