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https://github.com/Laupetin/OpenAssetTools.git
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74 lines
1.9 KiB
C
74 lines
1.9 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 xcbc_process.c
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XCBC Support, process blocks with XCBC
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*/
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#ifdef LTC_XCBC
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/** Process data through XCBC-MAC
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@param xcbc The XCBC-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 xcbc_process(xcbc_state *xcbc, const unsigned char *in, unsigned long inlen)
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{
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int err;
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#ifdef LTC_FAST
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int x;
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#endif
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LTC_ARGCHK(xcbc != NULL);
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LTC_ARGCHK(in != NULL);
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/* check structure */
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if ((err = cipher_is_valid(xcbc->cipher)) != CRYPT_OK) {
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return err;
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}
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if ((xcbc->blocksize > cipher_descriptor[xcbc->cipher].block_length) || (xcbc->blocksize < 0) ||
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(xcbc->buflen > xcbc->blocksize) || (xcbc->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 (xcbc->buflen == 0) {
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while (inlen > (unsigned long)xcbc->blocksize) {
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for (x = 0; x < xcbc->blocksize; x += sizeof(LTC_FAST_TYPE)) {
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*(LTC_FAST_TYPE_PTR_CAST(&(xcbc->IV[x]))) ^= *(LTC_FAST_TYPE_PTR_CAST(&(in[x])));
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}
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cipher_descriptor[xcbc->cipher].ecb_encrypt(xcbc->IV, xcbc->IV, &xcbc->key);
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in += xcbc->blocksize;
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inlen -= xcbc->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 (xcbc->buflen == xcbc->blocksize) {
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cipher_descriptor[xcbc->cipher].ecb_encrypt(xcbc->IV, xcbc->IV, &xcbc->key);
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xcbc->buflen = 0;
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}
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xcbc->IV[xcbc->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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