Mercurial > dropbear

annotate libtomcrypt/src/mac/omac/omac_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 omac_process.c
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13 OMAC1 support, process data, Tom St Denis
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14 */
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16
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17 #ifdef LTC_OMAC
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18
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19 /**
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20 Process data through OMAC
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21 @param omac The OMAC state
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22 @param in The input data to send through OMAC
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23 @param inlen The length of the input (octets)
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24 @return CRYPT_OK if successful
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25 */
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26 int omac_process(omac_state *omac, const unsigned char *in, unsigned long inlen)
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27 {
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28 unsigned long n, x;
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29 int err;
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31 LTC_ARGCHK(omac != NULL);
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32 LTC_ARGCHK(in != NULL);
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33 if ((err = cipher_is_valid(omac->cipher_idx)) != CRYPT_OK) {
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34 return err;
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35 }
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37 if ((omac->buflen > (int)sizeof(omac->block)) || (omac->buflen < 0) ||
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38 (omac->blklen > (int)sizeof(omac->block)) || (omac->buflen > omac->blklen)) {
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39 return CRYPT_INVALID_ARG;
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40 }
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42 #ifdef LTC_FAST
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43 {
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44 unsigned long blklen = cipher_descriptor[omac->cipher_idx].block_length;
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45
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46 if (omac->buflen == 0 && inlen > blklen) {
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47 unsigned long y;
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48 for (x = 0; x < (inlen - blklen); x += blklen) {
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49 for (y = 0; y < blklen; y += sizeof(LTC_FAST_TYPE)) {
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50 *(LTC_FAST_TYPE_PTR_CAST(&omac->prev[y])) ^= *(LTC_FAST_TYPE_PTR_CAST(&in[y]));
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51 }
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52 in += blklen;
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53 if ((err = cipher_descriptor[omac->cipher_idx].ecb_encrypt(omac->prev, omac->prev, &omac->key)) != CRYPT_OK) {
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54 return err;
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55 }
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56 }
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57 inlen -= x;
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58 }
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59 }
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60 #endif
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61
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62 while (inlen != 0) {
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63 /* ok if the block is full we xor in prev, encrypt and replace prev */
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64 if (omac->buflen == omac->blklen) {
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65 for (x = 0; x < (unsigned long)omac->blklen; x++) {
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66 omac->block[x] ^= omac->prev[x];
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67 }
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68 if ((err = cipher_descriptor[omac->cipher_idx].ecb_encrypt(omac->block, omac->prev, &omac->key)) != CRYPT_OK) {
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69 return err;
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70 }
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71 omac->buflen = 0;
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72 }
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73
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74 /* add bytes */
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75 n = MIN(inlen, (unsigned long)(omac->blklen - omac->buflen));
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76 XMEMCPY(omac->block + omac->buflen, in, n);
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77 omac->buflen += n;
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78 inlen -= n;
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79 in += n;
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80 }
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81
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82 return CRYPT_OK;
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83 }
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85 #endif
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87
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88 /* ref: $Format:%D$ */
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89 /* git commit: $Format:%H$ */
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90 /* commit time: $Format:%ai$ */