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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, tomstdenis@gmail.com, http://libtomcrypt.com
*/
#include "tomcrypt.h"
/**
@file f9_process.c
f9 Support, process blocks with f9
*/
#ifdef LTC_F9_MODE
/** Process data through f9-MAC
@param f9 The f9-MAC state
@param in Input data to process
@param inlen Length of input in octets
Return CRYPT_OK on success
*/
int f9_process(f9_state *f9, const unsigned char *in, unsigned long inlen)
{
int err, x;
LTC_ARGCHK(f9 != NULL);
LTC_ARGCHK(in != NULL);
/* check structure */
if ((err = cipher_is_valid(f9->cipher)) != CRYPT_OK) {
return err;
}
if ((f9->blocksize > cipher_descriptor[f9->cipher].block_length) || (f9->blocksize < 0) ||
(f9->buflen > f9->blocksize) || (f9->buflen < 0)) {
return CRYPT_INVALID_ARG;
}
#ifdef LTC_FAST
if (f9->buflen == 0) {
while (inlen >= (unsigned long)f9->blocksize) {
for (x = 0; x < f9->blocksize; x += sizeof(LTC_FAST_TYPE)) {
*((LTC_FAST_TYPE*)&(f9->IV[x])) ^= *((LTC_FAST_TYPE*)&(in[x]));
}
cipher_descriptor[f9->cipher].ecb_encrypt(f9->IV, f9->IV, &f9->key);
for (x = 0; x < f9->blocksize; x += sizeof(LTC_FAST_TYPE)) {
*((LTC_FAST_TYPE*)&(f9->ACC[x])) ^= *((LTC_FAST_TYPE*)&(f9->IV[x]));
}
in += f9->blocksize;
inlen -= f9->blocksize;
}
}
#endif
while (inlen) {
if (f9->buflen == f9->blocksize) {
cipher_descriptor[f9->cipher].ecb_encrypt(f9->IV, f9->IV, &f9->key);
for (x = 0; x < f9->blocksize; x++) {
f9->ACC[x] ^= f9->IV[x];
}
f9->buflen = 0;
}
f9->IV[f9->buflen++] ^= *in++;
--inlen;
}
return CRYPT_OK;
}
#endif
/* $Source: /cvs/libtom/libtomcrypt/src/mac/f9/f9_process.c,v $ */
/* $Revision: 1.3 $ */
/* $Date: 2006/12/16 17:41:21 $ */
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