/* crypto/aes/aes_ofb.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
#include <openssl/aes.h>
#include "aes_locl.h"
+#define STRICT_ALIGNMENT
+#if defined(__i386) || defined(__i386__) || \
+ defined(__x86_64) || defined(__x86_64__) || \
+ defined(_M_IX86) || defined(_M_AMD64) || defined(_M_X64)
+# undef STRICT_ALIGNMENT
+#endif
+
/* The input and output encrypted as though 128bit ofb mode is being
* used. The extra state information to record how much of the
* 128bit block we have used is contained in *num;
*/
void AES_ofb128_encrypt(const unsigned char *in, unsigned char *out,
- const unsigned long length, const AES_KEY *key,
+ unsigned long length, const AES_KEY *key,
unsigned char *ivec, int *num) {
unsigned int n;
- unsigned long l=length;
+ unsigned long l=0;
assert(in && out && key && ivec && num);
n = *num;
- while (l--) {
+#if !defined(OPENSSL_SMALL_FOOTPRINT)
+ if (AES_BLOCK_SIZE%sizeof(size_t) == 0) do { /* always true actually */
+ if (n) {
+ while (length) {
+ *(out++) = ivec[n] ^ *(in++);
+ length--;
+ if(!(n = (n + 1) % AES_BLOCK_SIZE))
+ break;
+ }
+ }
+#if defined(STRICT_ALIGNMENT)
+ if (((size_t)in|(size_t)out|(size_t)ivec)%sizeof(size_t) != 0)
+ break;
+#endif
+ while ((l + AES_BLOCK_SIZE) <= length) {
+ unsigned int i;
+ AES_encrypt(ivec, ivec, key);
+ for (i=0;i<AES_BLOCK_SIZE;i+=sizeof(size_t)) {
+ *(size_t*)(out+l+i) =
+ *(size_t*)(ivec+i) ^ *(size_t*)(in+l+i);
+ }
+ l += AES_BLOCK_SIZE;
+ }
+
+ if (l < length) {
+ AES_encrypt(ivec, ivec, key);
+ do { out[l] = ivec[n] ^ in[l];
+ l++; n++;
+ } while (l < length);
+ }
+ *num = n;
+ return;
+ } while(0);
+#endif
+
+ /* this code would be commonly eliminated by x86* compiler */
+ while (l<length) {
if (n == 0) {
AES_encrypt(ivec, ivec, key);
}
- *(out++) = *(in++) ^ ivec[n];
+ out[l] = ivec[n] ^ in[l];
+ l++;
n = (n+1) % AES_BLOCK_SIZE;
}
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