Mercurial > dropbear
view libtomcrypt/src/mac/xcbc/xcbc_process.c @ 410:b895f91c2ee6
merge of 'b1dd3b94e60a07a176dba2b035ac79968595990a'
and 'bcb33fce2fad01a7626598209d43af3571bd86f0'
author | Matt Johnston <matt@ucc.asn.au> |
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date | Sun, 04 Feb 2007 10:32:59 +0000 |
parents | 0cbe8f6dbf9e |
children | f849a5ca2efc |
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/* 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, [email protected], http://libtomcrypt.com */ #include "tomcrypt.h" /** @file xcbc_process.c XCBC Support, process blocks with XCBC */ #ifdef LTC_XCBC /** Process data through XCBC-MAC @param xcbc The XCBC-MAC state @param in Input data to process @param inlen Length of input in octets Return CRYPT_OK on success */ int xcbc_process(xcbc_state *xcbc, const unsigned char *in, unsigned long inlen) { int err; #ifdef LTC_FAST int x; #endif LTC_ARGCHK(xcbc != NULL); LTC_ARGCHK(in != NULL); /* check structure */ if ((err = cipher_is_valid(xcbc->cipher)) != CRYPT_OK) { return err; } if ((xcbc->blocksize > cipher_descriptor[xcbc->cipher].block_length) || (xcbc->blocksize < 0) || (xcbc->buflen > xcbc->blocksize) || (xcbc->buflen < 0)) { return CRYPT_INVALID_ARG; } #ifdef LTC_FAST if (xcbc->buflen == 0) { while (inlen > (unsigned long)xcbc->blocksize) { for (x = 0; x < xcbc->blocksize; x += sizeof(LTC_FAST_TYPE)) { *((LTC_FAST_TYPE*)&(xcbc->IV[x])) ^= *((LTC_FAST_TYPE*)&(in[x])); } cipher_descriptor[xcbc->cipher].ecb_encrypt(xcbc->IV, xcbc->IV, &xcbc->key); in += xcbc->blocksize; inlen -= xcbc->blocksize; } } #endif while (inlen) { if (xcbc->buflen == xcbc->blocksize) { cipher_descriptor[xcbc->cipher].ecb_encrypt(xcbc->IV, xcbc->IV, &xcbc->key); xcbc->buflen = 0; } xcbc->IV[xcbc->buflen++] ^= *in++; --inlen; } return CRYPT_OK; } #endif /* $Source: /cvs/libtom/libtomcrypt/src/mac/xcbc/xcbc_process.c,v $ */ /* $Revision: 1.9 $ */ /* $Date: 2006/11/09 22:43:52 $ */