Mercurial > dropbear

annotate libtomcrypt/src/mac/f9/f9_process.c @ 1912:8b4274d34fe8

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Use buf_burn_free() instead of two calls
author Matt Johnston <matt@ucc.asn.au>
date Tue, 29 Mar 2022 23:47:30 +0800
parents 6dba84798cd5
children
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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 #include "tomcrypt.h"
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10
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11 /**
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12 @file f9_process.c
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13 f9 Support, process blocks with f9
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14 */
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15
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16 #ifdef LTC_F9_MODE
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17
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18 /** Process data through f9-MAC
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19 @param f9 The f9-MAC state
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20 @param in Input data to process
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21 @param inlen Length of input in octets
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22 Return CRYPT_OK on success
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23 */
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24 int f9_process(f9_state *f9, const unsigned char *in, unsigned long inlen)
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25 {
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26 int err, x;
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27
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28 LTC_ARGCHK(f9 != NULL);
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29 LTC_ARGCHK(in != NULL);
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30
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31 /* check structure */
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32 if ((err = cipher_is_valid(f9->cipher)) != CRYPT_OK) {
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33 return err;
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34 }
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35
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36 if ((f9->blocksize > cipher_descriptor[f9->cipher].block_length) || (f9->blocksize < 0) ||
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37 (f9->buflen > f9->blocksize) || (f9->buflen < 0)) {
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38 return CRYPT_INVALID_ARG;
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39 }
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40
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41 #ifdef LTC_FAST
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42 if (f9->buflen == 0) {
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43 while (inlen >= (unsigned long)f9->blocksize) {
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44 for (x = 0; x < f9->blocksize; x += sizeof(LTC_FAST_TYPE)) {
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6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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45 *(LTC_FAST_TYPE_PTR_CAST(&(f9->IV[x]))) ^= *(LTC_FAST_TYPE_PTR_CAST(&(in[x])));
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46 }
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47 cipher_descriptor[f9->cipher].ecb_encrypt(f9->IV, f9->IV, &f9->key);
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48 for (x = 0; x < f9->blocksize; x += sizeof(LTC_FAST_TYPE)) {
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49 *(LTC_FAST_TYPE_PTR_CAST(&(f9->ACC[x]))) ^= *(LTC_FAST_TYPE_PTR_CAST(&(f9->IV[x])));
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50 }
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51 in += f9->blocksize;
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52 inlen -= f9->blocksize;
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53 }
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54 }
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55 #endif
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56
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57 while (inlen) {
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58 if (f9->buflen == f9->blocksize) {
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59 cipher_descriptor[f9->cipher].ecb_encrypt(f9->IV, f9->IV, &f9->key);
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60 for (x = 0; x < f9->blocksize; x++) {
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61 f9->ACC[x] ^= f9->IV[x];
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62 }
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63 f9->buflen = 0;
1471
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64 }
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65 f9->IV[f9->buflen++] ^= *in++;
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66 --inlen;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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67 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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68 return CRYPT_OK;
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69 }
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70
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71 #endif
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72
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73 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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74 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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75 /* commit time: $Format:%ai$ */
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76