Mercurial > dropbear

annotate libtomcrypt/src/mac/f9/f9_process.c @ 1180:1637dbd26212 DROPBEAR_2015.69

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2015.69
author Matt Johnston <matt@ucc.asn.au>
date Wed, 25 Nov 2015 23:07:47 +0800
parents 0cbe8f6dbf9e
children f849a5ca2efc
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
382
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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
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2 *
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3 * LibTomCrypt is a library that provides various cryptographic
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4 * algorithms in a highly modular and flexible manner.
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5 *
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6 * The library is free for all purposes without any express
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7 * guarantee it works.
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8 *
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9 * Tom St Denis, [email protected], http://libtomcrypt.com
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10 */
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11 #include "tomcrypt.h"
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12
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13 /**
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14 @file f9_process.c
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15 f9 Support, process blocks with f9
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16 */
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17
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18 #ifdef LTC_F9_MODE
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19
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20 /** Process data through f9-MAC
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21 @param f9 The f9-MAC state
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22 @param in Input data to process
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23 @param inlen Length of input in octets
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24 Return CRYPT_OK on success
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25 */
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26 int f9_process(f9_state *f9, const unsigned char *in, unsigned long inlen)
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27 {
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28 int err, x;
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29
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30 LTC_ARGCHK(f9 != NULL);
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31 LTC_ARGCHK(in != NULL);
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32
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33 /* check structure */
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34 if ((err = cipher_is_valid(f9->cipher)) != CRYPT_OK) {
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35 return err;
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36 }
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37
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38 if ((f9->blocksize > cipher_descriptor[f9->cipher].block_length) || (f9->blocksize < 0) ||
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39 (f9->buflen > f9->blocksize) || (f9->buflen < 0)) {
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40 return CRYPT_INVALID_ARG;
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41 }
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42
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43 #ifdef LTC_FAST
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44 if (f9->buflen == 0) {
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45 while (inlen >= (unsigned long)f9->blocksize) {
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46 for (x = 0; x < f9->blocksize; x += sizeof(LTC_FAST_TYPE)) {
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47 *((LTC_FAST_TYPE*)&(f9->IV[x])) ^= *((LTC_FAST_TYPE*)&(in[x]));
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48 }
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49 cipher_descriptor[f9->cipher].ecb_encrypt(f9->IV, f9->IV, &f9->key);
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50 for (x = 0; x < f9->blocksize; x += sizeof(LTC_FAST_TYPE)) {
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51 *((LTC_FAST_TYPE*)&(f9->ACC[x])) ^= *((LTC_FAST_TYPE*)&(f9->IV[x]));
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52 }
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53 in += f9->blocksize;
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54 inlen -= f9->blocksize;
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55 }
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56 }
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57 #endif
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58
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59 while (inlen) {
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60 if (f9->buflen == f9->blocksize) {
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61 cipher_descriptor[f9->cipher].ecb_encrypt(f9->IV, f9->IV, &f9->key);
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62 for (x = 0; x < f9->blocksize; x++) {
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63 f9->ACC[x] ^= f9->IV[x];
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64 }
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65 f9->buflen = 0;
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66 }
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67 f9->IV[f9->buflen++] ^= *in++;
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68 --inlen;
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69 }
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70 return CRYPT_OK;
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71 }
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72
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73 #endif
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74
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75 /* $Source: /cvs/libtom/libtomcrypt/src/mac/f9/f9_process.c,v $ */
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76 /* $Revision: 1.3 $ */
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77 /* $Date: 2006/12/16 17:41:21 $ */
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78