| /* 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 $ */ |
| |