Mercurial > dropbear
annotate libtomcrypt/src/mac/hmac/hmac_memory.c @ 1125:7cb1f49d89a8
a bit more changelog
author | Matt Johnston <matt@ucc.asn.au> |
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date | Fri, 12 Jun 2015 22:55:10 +0800 |
parents | 0cbe8f6dbf9e |
children | f849a5ca2efc |
rev | line source |
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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 * Tom St Denis, [email protected], http://libtomcrypt.com |
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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 hmac_memory.c |
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15 HMAC support, process a block of memory, Tom St Denis/Dobes Vandermeer |
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16 */ |
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17 |
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18 #ifdef LTC_HMAC |
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19 |
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20 /** |
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21 HMAC a block of memory to produce the authentication tag |
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22 @param hash The index of the hash to use |
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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 HMAC |
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26 @param inlen The length of the data to HMAC (octets) |
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27 @param out [out] Destination of the authentication tag |
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28 @param outlen [in/out] Max size and resulting size of authentication tag |
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29 @return CRYPT_OK if successful |
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30 */ |
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31 int hmac_memory(int hash, |
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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 hmac_state *hmac; |
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37 int err; |
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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 |
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44 /* make sure hash descriptor is valid */ |
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45 if ((err = hash_is_valid(hash)) != CRYPT_OK) { |
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46 return err; |
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47 } |
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48 |
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49 /* is there a descriptor? */ |
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50 if (hash_descriptor[hash].hmac_block != NULL) { |
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51 return hash_descriptor[hash].hmac_block(key, keylen, in, inlen, out, outlen); |
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52 } |
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53 |
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54 /* nope, so call the hmac functions */ |
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55 /* allocate ram for hmac state */ |
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56 hmac = XMALLOC(sizeof(hmac_state)); |
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57 if (hmac == NULL) { |
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58 return CRYPT_MEM; |
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59 } |
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60 |
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61 if ((err = hmac_init(hmac, hash, key, keylen)) != CRYPT_OK) { |
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62 goto LBL_ERR; |
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63 } |
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64 |
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65 if ((err = hmac_process(hmac, in, inlen)) != 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 if ((err = hmac_done(hmac, out, outlen)) != CRYPT_OK) { |
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70 goto LBL_ERR; |
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71 } |
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72 |
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73 err = CRYPT_OK; |
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74 LBL_ERR: |
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75 #ifdef LTC_CLEAN_STACK |
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76 zeromem(hmac, sizeof(hmac_state)); |
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77 #endif |
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78 |
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79 XFREE(hmac); |
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80 return err; |
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81 } |
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82 |
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83 #endif |
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84 |
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85 |
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86 /* $Source: /cvs/libtom/libtomcrypt/src/mac/hmac/hmac_memory.c,v $ */ |
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87 /* $Revision: 1.6 $ */ |
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88 /* $Date: 2006/11/03 00:39:49 $ */ |