+++ /dev/null
-/* 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.
- */
-#include "tomcrypt.h"
-
-/**
- @file omac_process.c
- OMAC1 support, process data, Tom St Denis
-*/
-
-
-#ifdef LTC_OMAC
-
-/**
- Process data through OMAC
- @param omac The OMAC state
- @param in The input data to send through 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_PTR_CAST(&omac->prev[y])) ^= *(LTC_FAST_TYPE_PTR_CAST(&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
-
-
-/* ref: $Format:%D$ */
-/* git commit: $Format:%H$ */
-/* commit time: $Format:%ai$ */