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77 lines
2.1 KiB
C
77 lines
2.1 KiB
C
/* LibTomCrypt, modular cryptographic library -- Tom St Denis
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*
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* LibTomCrypt is a library that provides various cryptographic
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* algorithms in a highly modular and flexible manner.
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*
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* The library is free for all purposes without any express
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* guarantee it works.
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*/
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#include "tomcrypt.h"
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/**
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@file f9_process.c
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f9 Support, process blocks with f9
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*/
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#ifdef LTC_F9_MODE
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/** Process data through f9-MAC
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@param f9 The f9-MAC state
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@param in Input data to process
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@param inlen Length of input in octets
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Return CRYPT_OK on success
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*/
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int f9_process(f9_state *f9, const unsigned char *in, unsigned long inlen)
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{
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int err, x;
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LTC_ARGCHK(f9 != NULL);
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LTC_ARGCHK(in != NULL);
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/* check structure */
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if ((err = cipher_is_valid(f9->cipher)) != CRYPT_OK) {
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return err;
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}
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if ((f9->blocksize > cipher_descriptor[f9->cipher].block_length) || (f9->blocksize < 0) ||
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(f9->buflen > f9->blocksize) || (f9->buflen < 0)) {
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return CRYPT_INVALID_ARG;
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}
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#ifdef LTC_FAST
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if (f9->buflen == 0) {
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while (inlen >= (unsigned long)f9->blocksize) {
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for (x = 0; x < f9->blocksize; x += sizeof(LTC_FAST_TYPE)) {
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*(LTC_FAST_TYPE_PTR_CAST(&(f9->IV[x]))) ^= *(LTC_FAST_TYPE_PTR_CAST(&(in[x])));
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}
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cipher_descriptor[f9->cipher].ecb_encrypt(f9->IV, f9->IV, &f9->key);
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for (x = 0; x < f9->blocksize; x += sizeof(LTC_FAST_TYPE)) {
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*(LTC_FAST_TYPE_PTR_CAST(&(f9->ACC[x]))) ^= *(LTC_FAST_TYPE_PTR_CAST(&(f9->IV[x])));
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}
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in += f9->blocksize;
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inlen -= f9->blocksize;
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}
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}
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#endif
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while (inlen) {
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if (f9->buflen == f9->blocksize) {
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cipher_descriptor[f9->cipher].ecb_encrypt(f9->IV, f9->IV, &f9->key);
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for (x = 0; x < f9->blocksize; x++) {
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f9->ACC[x] ^= f9->IV[x];
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}
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f9->buflen = 0;
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}
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f9->IV[f9->buflen++] ^= *in++;
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--inlen;
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}
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return CRYPT_OK;
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}
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#endif
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/* ref: HEAD -> master, tag: v1.18.2 */
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/* git commit: 7e7eb695d581782f04b24dc444cbfde86af59853 */
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/* commit time: 2018-07-01 22:49:01 +0200 */
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