1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis 2 * 3 * LibTomCrypt is a library that provides various cryptographic 4 * algorithms in a highly modular and flexible manner. 5 * 6 * The library is free for all purposes without any express 7 * guarantee it works. 8 * 9 * Tom St Denis, tomstdenis (at) gmail.com, http://libtomcrypt.com 10 */ 11 #include "tomcrypt.h" 12 13 /** 14 @file f9_process.c 15 f9 Support, process blocks with f9 16 */ 17 18 #ifdef LTC_F9_MODE 19 20 /** Process data through f9-MAC 21 @param f9 The f9-MAC state 22 @param in Input data to process 23 @param inlen Length of input in octets 24 Return CRYPT_OK on success 25 */ 26 int f9_process(f9_state *f9, const unsigned char *in, unsigned long inlen) 27 { 28 int err, x; 29 30 LTC_ARGCHK(f9 != NULL); 31 LTC_ARGCHK(in != NULL); 32 33 /* check structure */ 34 if ((err = cipher_is_valid(f9->cipher)) != CRYPT_OK) { 35 return err; 36 } 37 38 if ((f9->blocksize > cipher_descriptor[f9->cipher].block_length) || (f9->blocksize < 0) || 39 (f9->buflen > f9->blocksize) || (f9->buflen < 0)) { 40 return CRYPT_INVALID_ARG; 41 } 42 43 #ifdef LTC_FAST 44 if (f9->buflen == 0) { 45 while (inlen >= (unsigned long)f9->blocksize) { 46 for (x = 0; x < f9->blocksize; x += sizeof(LTC_FAST_TYPE)) { 47 *((LTC_FAST_TYPE*)&(f9->IV[x])) ^= *((LTC_FAST_TYPE*)&(in[x])); 48 } 49 cipher_descriptor[f9->cipher].ecb_encrypt(f9->IV, f9->IV, &f9->key); 50 for (x = 0; x < f9->blocksize; x += sizeof(LTC_FAST_TYPE)) { 51 *((LTC_FAST_TYPE*)&(f9->ACC[x])) ^= *((LTC_FAST_TYPE*)&(f9->IV[x])); 52 } 53 in += f9->blocksize; 54 inlen -= f9->blocksize; 55 } 56 } 57 #endif 58 59 while (inlen) { 60 if (f9->buflen == f9->blocksize) { 61 cipher_descriptor[f9->cipher].ecb_encrypt(f9->IV, f9->IV, &f9->key); 62 for (x = 0; x < f9->blocksize; x++) { 63 f9->ACC[x] ^= f9->IV[x]; 64 } 65 f9->buflen = 0; 66 } 67 f9->IV[f9->buflen++] ^= *in++; 68 --inlen; 69 } 70 return CRYPT_OK; 71 } 72 73 #endif 74 75 /* $Source: /cvs/libtom/libtomcrypt/src/mac/f9/f9_process.c,v $ */ 76 /* $Revision: 1.3 $ */ 77 /* $Date: 2006/12/16 17:41:21 $ */ 78 79