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      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