Mercurial > dropbear

annotate libtomcrypt/src/mac/xcbc/xcbc_process.c @ 1734:73646de50f13 DROPBEAR_2020.80

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version 2020.80
author Matt Johnston <matt@ucc.asn.au>
date Fri, 26 Jun 2020 21:45:59 +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 xcbc_process.c
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13 XCBC Support, process blocks with XCBC
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14 */
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15
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16 #ifdef LTC_XCBC
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17
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18 /** Process data through XCBC-MAC
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19 @param xcbc The XCBC-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 xcbc_process(xcbc_state *xcbc, const unsigned char *in, unsigned long inlen)
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25 {
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26 int err;
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27 #ifdef LTC_FAST
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28 int x;
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29 #endif
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30
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31 LTC_ARGCHK(xcbc != NULL);
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32 LTC_ARGCHK(in != NULL);
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33
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34 /* check structure */
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35 if ((err = cipher_is_valid(xcbc->cipher)) != CRYPT_OK) {
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36 return err;
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37 }
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38
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39 if ((xcbc->blocksize > cipher_descriptor[xcbc->cipher].block_length) || (xcbc->blocksize < 0) ||
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40 (xcbc->buflen > xcbc->blocksize) || (xcbc->buflen < 0)) {
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41 return CRYPT_INVALID_ARG;
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42 }
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43
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44 #ifdef LTC_FAST
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45 if (xcbc->buflen == 0) {
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46 while (inlen > (unsigned long)xcbc->blocksize) {
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47 for (x = 0; x < xcbc->blocksize; x += sizeof(LTC_FAST_TYPE)) {
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48 *(LTC_FAST_TYPE_PTR_CAST(&(xcbc->IV[x]))) ^= *(LTC_FAST_TYPE_PTR_CAST(&(in[x])));
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49 }
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50 cipher_descriptor[xcbc->cipher].ecb_encrypt(xcbc->IV, xcbc->IV, &xcbc->key);
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51 in += xcbc->blocksize;
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52 inlen -= xcbc->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 (xcbc->buflen == xcbc->blocksize) {
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59 cipher_descriptor[xcbc->cipher].ecb_encrypt(xcbc->IV, xcbc->IV, &xcbc->key);
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60 xcbc->buflen = 0;
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61 }
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62 xcbc->IV[xcbc->buflen++] ^= *in++;
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63 --inlen;
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64 }
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65 return CRYPT_OK;
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66 }
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67
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68 #endif
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69
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70 /* ref: $Format:%D$ */
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71 /* git commit: $Format:%H$ */
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72 /* commit time: $Format:%ai$ */
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73