Mercurial > dropbear

annotate libtomcrypt/src/mac/xcbc/xcbc_process.c @ 1902:4a6725ac957c

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Revert "Don't include sk keys at all in KEX list" This reverts git commit f972813ecdc7bb981d25b5a63638bd158f1c8e72. The sk algorithms need to remain in the sigalgs list so that they are included in the server-sig-algs ext-info message sent by the server. RFC8308 for server-sig-algs requires that all algorithms are listed (though OpenSSH client 8.4p1 tested doesn't require that)
author Matt Johnston <matt@ucc.asn.au>
date Thu, 24 Mar 2022 13:42:08 +0800
parents 6dba84798cd5
children
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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