diff options
Diffstat (limited to 'core/lib/libtomcrypt/src/mac/omac/omac_process.c')
| -rw-r--r-- | core/lib/libtomcrypt/src/mac/omac/omac_process.c | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/core/lib/libtomcrypt/src/mac/omac/omac_process.c b/core/lib/libtomcrypt/src/mac/omac/omac_process.c new file mode 100644 index 0000000..2e1e2cc --- /dev/null +++ b/core/lib/libtomcrypt/src/mac/omac/omac_process.c @@ -0,0 +1,116 @@ +/* + * 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 + */ +#include "tomcrypt.h" + +/** + @file omac_process.c + LTC_OMAC1 support, process data, Tom St Denis +*/ + + +#ifdef LTC_OMAC + +/** + Process data through LTC_OMAC + @param omac The LTC_OMAC state + @param in The input data to send through LTC_OMAC + @param inlen The length of the input (octets) + @return CRYPT_OK if successful +*/ +int omac_process(omac_state *omac, const unsigned char *in, unsigned long inlen) +{ + unsigned long n, x; + int err; + + LTC_ARGCHK(omac != NULL); + LTC_ARGCHK(in != NULL); + if ((err = cipher_is_valid(omac->cipher_idx)) != CRYPT_OK) { + return err; + } + + if ((omac->buflen > (int)sizeof(omac->block)) || (omac->buflen < 0) || + (omac->blklen > (int)sizeof(omac->block)) || (omac->buflen > omac->blklen)) { + return CRYPT_INVALID_ARG; + } + +#ifdef LTC_FAST + unsigned long blklen = cipher_descriptor[omac->cipher_idx]->block_length; + if (omac->buflen == 0 && inlen > blklen) { + unsigned long y; + for (x = 0; x < (inlen - blklen); x += blklen) { + for (y = 0; y < blklen; y += sizeof(LTC_FAST_TYPE)) { + *((LTC_FAST_TYPE*)(&omac->prev[y])) ^= *((LTC_FAST_TYPE*)(&in[y])); + } + in += blklen; + if ((err = cipher_descriptor[omac->cipher_idx]->ecb_encrypt(omac->prev, omac->prev, &omac->key)) != CRYPT_OK) { + return err; + } + } + inlen -= x; + } +#endif + + while (inlen != 0) { + /* ok if the block is full we xor in prev, encrypt and replace prev */ + if (omac->buflen == omac->blklen) { + for (x = 0; x < (unsigned long)omac->blklen; x++) { + omac->block[x] ^= omac->prev[x]; + } + if ((err = cipher_descriptor[omac->cipher_idx]->ecb_encrypt(omac->block, omac->prev, &omac->key)) != CRYPT_OK) { + return err; + } + omac->buflen = 0; + } + + /* add bytes */ + n = MIN(inlen, (unsigned long)(omac->blklen - omac->buflen)); + XMEMCPY(omac->block + omac->buflen, in, n); + omac->buflen += n; + inlen -= n; + in += n; + } + + return CRYPT_OK; +} + +#endif + + +/* $Source: /cvs/libtom/libtomcrypt/src/mac/omac/omac_process.c,v $ */ +/* $Revision: 1.13 $ */ +/* $Date: 2007/05/12 14:37:41 $ */ |