Mercurial > dropbear

annotate libtomcrypt/src/mac/omac/omac_memory.c @ 1711:e9dba7abd939

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Merge libtomcrypt v1.18.2
author Matt Johnston <matt@ucc.asn.au>
date Wed, 10 Jun 2020 23:16:13 +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_memory.c
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13 OMAC1 support, process a block of memory, Tom St Denis
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14 */
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15
382
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16 #ifdef LTC_OMAC
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17
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18 /**
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19 OMAC a block of memory
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20 @param cipher The index of the desired cipher
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21 @param key The secret key
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22 @param keylen The length of the secret key (octets)
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23 @param in The data to send through OMAC
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24 @param inlen The length of the data to send through OMAC (octets)
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25 @param out [out] The destination of the authentication tag
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26 @param outlen [in/out] The max size and resulting size of the authentication tag (octets)
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27 @return CRYPT_OK if successful
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28 */
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29 int omac_memory(int cipher,
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30 const unsigned char *key, unsigned long keylen,
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31 const unsigned char *in, unsigned long inlen,
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32 unsigned char *out, unsigned long *outlen)
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33 {
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34 int err;
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35 omac_state *omac;
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36
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37 LTC_ARGCHK(key != NULL);
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38 LTC_ARGCHK(in != NULL);
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39 LTC_ARGCHK(out != NULL);
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40 LTC_ARGCHK(outlen != NULL);
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41
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42 /* is the cipher valid? */
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43 if ((err = cipher_is_valid(cipher)) != CRYPT_OK) {
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44 return err;
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45 }
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46
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47 /* Use accelerator if found */
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48 if (cipher_descriptor[cipher].omac_memory != NULL) {
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49 return cipher_descriptor[cipher].omac_memory(key, keylen, in, inlen, out, outlen);
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50 }
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51
285
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52 /* allocate ram for omac state */
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53 omac = XMALLOC(sizeof(omac_state));
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54 if (omac == NULL) {
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55 return CRYPT_MEM;
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56 }
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57
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58 /* omac process the message */
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59 if ((err = omac_init(omac, cipher, key, keylen)) != CRYPT_OK) {
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60 goto LBL_ERR;
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61 }
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62 if ((err = omac_process(omac, in, inlen)) != CRYPT_OK) {
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63 goto LBL_ERR;
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64 }
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65 if ((err = omac_done(omac, out, outlen)) != CRYPT_OK) {
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66 goto LBL_ERR;
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67 }
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68
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69 err = CRYPT_OK;
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70 LBL_ERR:
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71 #ifdef LTC_CLEAN_STACK
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72 zeromem(omac, sizeof(omac_state));
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73 #endif
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74
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75 XFREE(omac);
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76 return err;
285
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77 }
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78
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79 #endif
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80
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81 /* ref: $Format:%D$ */
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82 /* git commit: $Format:%H$ */
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83 /* commit time: $Format:%ai$ */