Mercurial > dropbear

annotate libtomcrypt/src/mac/omac/omac_process.c @ 1820:e9854650d45b

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Clarify help text for dropbear -e environment option
author Matt Johnston <matt@ucc.asn.au>
date Thu, 19 Aug 2021 23:17:34 +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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30
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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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41
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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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84
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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: $Format:%ai$ */