Mercurial > dropbear
view libtomcrypt/src/mac/xcbc/xcbc_process.c @ 1938:77bc00dcc19f default tip main master
Bump version to 2022.82
author | Matt Johnston <matt@ucc.asn.au> |
---|---|
date | Fri, 01 Apr 2022 14:43:27 +0800 |
parents | 6dba84798cd5 |
children |
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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. */ #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_PTR_CAST(&(xcbc->IV[x]))) ^= *(LTC_FAST_TYPE_PTR_CAST(&(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 /* ref: $Format:%D$ */ /* git commit: $Format:%H$ */ /* commit time: $Format:%ai$ */