Mercurial > dropbear
annotate libtomcrypt/src/mac/omac/omac_memory.c @ 1938:77bc00dcc19f default tip main master
Bump version to 2022.82
author | Matt Johnston <matt@ucc.asn.au> |
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date | Fri, 01 Apr 2022 14:43:27 +0800 |
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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 |
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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 |
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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; |
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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: $Format:%ai$ */ |