Mercurial > dropbear
annotate src/mac/omac/omac_memory.c @ 380:d5faf4814ddb libtomcrypt-orig libtomcrypt-1.16
Update to LibTomCrypt 1.16
author | Matt Johnston <matt@ucc.asn.au> |
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date | Thu, 11 Jan 2007 02:22:00 +0000 |
parents | 59400faa4b44 |
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Re-import libtomcrypt 1.05 for cleaner propagating.
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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 * |
380 | 9 * Tom St Denis, [email protected], http://libtomcrypt.com |
280
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10 */ |
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11 #include "tomcrypt.h" |
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12 |
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13 /** |
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14 @file omac_memory.c |
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15 OMAC1 support, process a block of memory, Tom St Denis |
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16 */ |
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17 |
380 | 18 #ifdef LTC_OMAC |
280
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19 |
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20 /** |
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21 OMAC a block of memory |
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22 @param cipher The index of the desired cipher |
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23 @param key The secret key |
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24 @param keylen The length of the secret key (octets) |
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25 @param in The data to send through OMAC |
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26 @param inlen The length of the data to send through OMAC (octets) |
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27 @param out [out] The destination of the authentication tag |
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28 @param outlen [in/out] The max size and resulting size of the authentication tag (octets) |
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29 @return CRYPT_OK if successful |
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30 */ |
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31 int omac_memory(int cipher, |
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32 const unsigned char *key, unsigned long keylen, |
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33 const unsigned char *in, unsigned long inlen, |
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34 unsigned char *out, unsigned long *outlen) |
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35 { |
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36 int err; |
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37 omac_state *omac; |
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38 |
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39 LTC_ARGCHK(key != NULL); |
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40 LTC_ARGCHK(in != NULL); |
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41 LTC_ARGCHK(out != NULL); |
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42 LTC_ARGCHK(outlen != NULL); |
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43 |
380 | 44 /* is the cipher valid? */ |
45 if ((err = cipher_is_valid(cipher)) != CRYPT_OK) { | |
46 return err; | |
47 } | |
48 | |
49 /* Use accelerator if found */ | |
50 if (cipher_descriptor[cipher].omac_memory != NULL) { | |
51 return cipher_descriptor[cipher].omac_memory(key, keylen, in, inlen, out, outlen); | |
52 } | |
53 | |
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54 /* allocate ram for omac state */ |
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55 omac = XMALLOC(sizeof(omac_state)); |
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56 if (omac == NULL) { |
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57 return CRYPT_MEM; |
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58 } |
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59 |
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60 /* omac process the message */ |
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61 if ((err = omac_init(omac, cipher, key, keylen)) != CRYPT_OK) { |
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62 goto LBL_ERR; |
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63 } |
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64 if ((err = omac_process(omac, in, inlen)) != CRYPT_OK) { |
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65 goto LBL_ERR; |
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66 } |
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67 if ((err = omac_done(omac, out, outlen)) != CRYPT_OK) { |
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68 goto LBL_ERR; |
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69 } |
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70 |
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71 err = CRYPT_OK; |
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72 LBL_ERR: |
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73 #ifdef LTC_CLEAN_STACK |
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74 zeromem(omac, sizeof(omac_state)); |
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75 #endif |
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76 |
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77 XFREE(omac); |
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78 return err; |
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79 } |
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80 |
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81 #endif |
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82 |
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83 /* $Source: /cvs/libtom/libtomcrypt/src/mac/omac/omac_memory.c,v $ */ |
380 | 84 /* $Revision: 1.6 $ */ |
85 /* $Date: 2006/11/08 23:01:06 $ */ |