diff options
Diffstat (limited to 'core/lib/libtomcrypt/src/encauth/gcm/gcm_memory.c')
| -rw-r--r-- | core/lib/libtomcrypt/src/encauth/gcm/gcm_memory.c | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/core/lib/libtomcrypt/src/encauth/gcm/gcm_memory.c b/core/lib/libtomcrypt/src/encauth/gcm/gcm_memory.c new file mode 100644 index 0000000..e7764c3 --- /dev/null +++ b/core/lib/libtomcrypt/src/encauth/gcm/gcm_memory.c @@ -0,0 +1,136 @@ +/* + * Copyright (c) 2001-2007, Tom St Denis + * All rights reserved. + * + * 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 above 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. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT HOLDER 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. + */ + +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtom.org + */ + +/** + @file gcm_memory.c + GCM implementation, process a packet, by Tom St Denis +*/ +#include "tomcrypt.h" + +#ifdef LTC_GCM_MODE + +/** + Process an entire GCM packet in one call. + @param cipher Index of cipher to use + @param key The secret key + @param keylen The length of the secret key + @param IV The initial vector + @param IVlen The length of the initial vector + @param adata The additional authentication data (header) + @param adatalen The length of the adata + @param pt The plaintext + @param ptlen The length of the plaintext (ciphertext length is the same) + @param ct The ciphertext + @param tag [out] The MAC tag + @param taglen [in/out] The MAC tag length + @param direction Encrypt or Decrypt mode (GCM_ENCRYPT or GCM_DECRYPT) + @return CRYPT_OK on success + */ +int gcm_memory( int cipher, + const unsigned char *key, unsigned long keylen, + const unsigned char *IV, unsigned long IVlen, + const unsigned char *adata, unsigned long adatalen, + unsigned char *pt, unsigned long ptlen, + unsigned char *ct, + unsigned char *tag, unsigned long *taglen, + int direction) +{ + void *orig; + gcm_state *gcm; + int err; + + if ((err = cipher_is_valid(cipher)) != CRYPT_OK) { + return err; + } + + if (cipher_descriptor[cipher]->accel_gcm_memory != NULL) { + return + cipher_descriptor[cipher]->accel_gcm_memory + (key, keylen, + IV, IVlen, + adata, adatalen, + pt, ptlen, + ct, + tag, taglen, + direction); + } + + + +#ifndef LTC_GCM_TABLES_SSE2 + orig = gcm = XMALLOC(sizeof(*gcm)); +#else + orig = gcm = XMALLOC(sizeof(*gcm) + 16); +#endif + if (gcm == NULL) { + return CRYPT_MEM; + } + + /* Force GCM to be on a multiple of 16 so we can use 128-bit aligned operations + * note that we only modify gcm and keep orig intact. This code is not portable + * but again it's only for SSE2 anyways, so who cares? + */ +#ifdef LTC_GCM_TABLES_SSE2 + if ((unsigned long)gcm & 15) { + gcm = (gcm_state *)((unsigned long)gcm + (16 - ((unsigned long)gcm & 15))); + } +#endif + + if ((err = gcm_init(gcm, cipher, key, keylen)) != CRYPT_OK) { + goto LTC_ERR; + } + if ((err = gcm_add_iv(gcm, IV, IVlen)) != CRYPT_OK) { + goto LTC_ERR; + } + if ((err = gcm_add_aad(gcm, adata, adatalen)) != CRYPT_OK) { + goto LTC_ERR; + } + if ((err = gcm_process(gcm, pt, ptlen, ct, direction)) != CRYPT_OK) { + goto LTC_ERR; + } + err = gcm_done(gcm, tag, taglen); +LTC_ERR: + XFREE(orig); + return err; +} +#endif + + +/* $Source: /cvs/libtom/libtomcrypt/src/encauth/gcm/gcm_memory.c,v $ */ +/* $Revision: 1.25 $ */ +/* $Date: 2007/05/12 14:32:35 $ */ |