diff options
author | Andy Polyakov <appro@openssl.org> | 2006-06-05 10:40:54 +0000 |
---|---|---|
committer | Andy Polyakov <appro@openssl.org> | 2006-06-05 10:40:54 +0000 |
commit | 41fc5f2dbe63ea0b5e58208c2a2b0acc4301bf01 (patch) | |
tree | c2715376e8c7d2183fe6fa60ecd18cbe2d264abb | |
parent | bcfd3d68f55396f362d7c7167f4f55267a0b0c13 (diff) |
Reimplement AES_ofb128_encrypt.
-rw-r--r-- | crypto/aes/aes_ofb.c | 110 |
1 files changed, 49 insertions, 61 deletions
diff --git a/crypto/aes/aes_ofb.c b/crypto/aes/aes_ofb.c index f358bb39e2..eda1e55bdf 100644 --- a/crypto/aes/aes_ofb.c +++ b/crypto/aes/aes_ofb.c @@ -1,6 +1,6 @@ /* 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 @@ -48,62 +48,6 @@ * ==================================================================== * */ -/* 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 @@ -115,26 +59,70 @@ #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; } |