/* crypto/aes/aes_cfb.c -*- mode:C; c-file-style: "eay" -*- */
/* ====================================================================
- * Copyright (c) 1998-2002 The OpenSSL Project. All rights reserved.
+ * Copyright (c) 2002-2006 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
* ====================================================================
*
*/
-/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
- * All rights reserved.
- *
- * This package is an SSL implementation written
- * by Eric Young (eay@cryptsoft.com).
- * The implementation was written so as to conform with Netscapes SSL.
- *
- * This library is free for commercial and non-commercial use as long as
- * the following conditions are aheared to. The following conditions
- * apply to all code found in this distribution, be it the RC4, RSA,
- * lhash, DES, etc., code; not just the SSL code. The SSL documentation
- * included with this distribution is covered by the same copyright terms
- * except that the holder is Tim Hudson (tjh@cryptsoft.com).
- *
- * Copyright remains Eric Young's, and as such any Copyright notices in
- * the code are not to be removed.
- * If this package is used in a product, Eric Young should be given attribution
- * as the author of the parts of the library used.
- * This can be in the form of a textual message at program startup or
- * in documentation (online or textual) provided with the package.
- *
- * 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 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 acknowledgement:
- * "This product includes cryptographic software written by
- * Eric Young (eay@cryptsoft.com)"
- * The word 'cryptographic' can be left out if the rouines from the library
- * being used are not cryptographic related :-).
- * 4. If you include any Windows specific code (or a derivative thereof) from
- * the apps directory (application code) you must include an acknowledgement:
- * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
- *
- * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``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 AUTHOR 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.
- *
- * The licence and distribution terms for any publically available version or
- * derivative of this code cannot be changed. i.e. this code cannot simply be
- * copied and put under another distribution licence
- * [including the GNU Public Licence.]
- */
-
-#ifndef AES_DEBUG
-# ifndef NDEBUG
-# define NDEBUG
-# endif
-#endif
-#include <assert.h>
#include <openssl/aes.h>
-#include "aes_locl.h"
-#include "e_os.h"
+#include <openssl/modes.h>
/* The input and output encrypted as though 128bit cfb mode is being
* used. The extra state information to record how much of the
*/
void AES_cfb128_encrypt(const unsigned char *in, unsigned char *out,
- const unsigned long length, const AES_KEY *key,
+ size_t length, const AES_KEY *key,
unsigned char *ivec, int *num, const int enc) {
- unsigned int n;
- unsigned long l = length;
- unsigned char c;
-
- assert(in && out && key && ivec && num);
-
- n = *num;
-
- if (enc) {
- while (l--) {
- if (n == 0) {
- AES_encrypt(ivec, ivec, key);
- }
- ivec[n] = *(out++) = *(in++) ^ ivec[n];
- n = (n+1) % AES_BLOCK_SIZE;
- }
- } else {
- while (l--) {
- if (n == 0) {
- AES_encrypt(ivec, ivec, key);
- }
- c = *(in);
- *(out++) = *(in++) ^ ivec[n];
- ivec[n] = c;
- n = (n+1) % AES_BLOCK_SIZE;
- }
- }
-
- *num=n;
+ CRYPTO_cfb128_encrypt(in,out,length,key,ivec,num,enc,(block128_f)AES_encrypt);
}
-/* This expects a single block of size nbits for both in and out. Note that
- it corrupts any extra bits in the last byte of out */
-void AES_cfbr_encrypt_block(const unsigned char *in,unsigned char *out,
- const int nbits,const AES_KEY *key,
- unsigned char *ivec,const int enc)
- {
- int n,rem,num;
- unsigned char ovec[AES_BLOCK_SIZE*2];
-
- if (nbits<=0 || nbits>128) return;
-
- /* fill in the first half of the new IV with the current IV */
- memcpy(ovec,ivec,AES_BLOCK_SIZE);
- /* construct the new IV */
- AES_encrypt(ivec,ivec,key);
- num = (nbits+7)/8;
- if (enc) /* encrypt the input */
- for(n=0 ; n < num ; ++n)
- out[n] = (ovec[AES_BLOCK_SIZE+n] = in[n] ^ ivec[n]);
- else /* decrypt the input */
- for(n=0 ; n < num ; ++n)
- out[n] = (ovec[AES_BLOCK_SIZE+n] = in[n]) ^ ivec[n];
- /* shift ovec left... */
- rem = nbits%8;
- num = nbits/8;
- if(rem==0)
- memcpy(ivec,ovec+num,AES_BLOCK_SIZE);
- else
- for(n=0 ; n < AES_BLOCK_SIZE ; ++n)
- ivec[n] = ovec[n+num]<<rem | ovec[n+num+1]>>(8-rem);
-
- /* it is not necessary to cleanse ovec, since the IV is not secret */
- }
-
/* N.B. This expects the input to be packed, MS bit first */
void AES_cfb1_encrypt(const unsigned char *in, unsigned char *out,
- const unsigned long length, const AES_KEY *key,
+ size_t length, const AES_KEY *key,
unsigned char *ivec, int *num, const int enc)
{
- unsigned int n;
- unsigned char c[1],d[1];
-
- assert(in && out && key && ivec && num);
- assert(*num == 0);
-
- memset(out,0,(length+7)/8);
- for(n=0 ; n < length ; ++n)
- {
- c[0]=(in[n/8]&(1 << (7-n%8))) ? 0x80 : 0;
- AES_cfbr_encrypt_block(c,d,1,key,ivec,enc);
- out[n/8]=(out[n/8]&~(1 << (7-n%8)))|((d[0]&0x80) >> (n%8));
- }
+ CRYPTO_cfb128_1_encrypt(in,out,length,key,ivec,num,enc,(block128_f)AES_encrypt);
}
void AES_cfb8_encrypt(const unsigned char *in, unsigned char *out,
- const unsigned long length, const AES_KEY *key,
+ size_t length, const AES_KEY *key,
unsigned char *ivec, int *num, const int enc)
{
- unsigned int n;
-
- assert(in && out && key && ivec && num);
- assert(*num == 0);
-
- for(n=0 ; n < length ; ++n)
- AES_cfbr_encrypt_block(&in[n],&out[n],8,key,ivec,enc);
+ CRYPTO_cfb128_8_encrypt(in,out,length,key,ivec,num,enc,(block128_f)AES_encrypt);
}
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