Mercurial > dropbear
annotate libtomcrypt/src/mac/hmac/hmac_done.c @ 1140:f6d3a16ecc71
set timeouts to time remaining rather than timeout duration
author | Matt Johnston <matt@ucc.asn.au> |
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date | Mon, 03 Aug 2015 23:05:43 +0800 |
parents | a2bfd4374878 |
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_done.c |
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15 HMAC support, terminate stream, 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 #define HMAC_BLOCKSIZE hash_descriptor[hash].blocksize |
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21 |
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22 /** |
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23 Terminate an HMAC session |
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24 @param hmac The HMAC state |
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25 @param out [out] The destination of the HMAC authentication tag |
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26 @param outlen [in/out] The max size and resulting size of the HMAC authentication tag |
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27 @return CRYPT_OK if successful |
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28 */ |
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29 int hmac_done(hmac_state *hmac, unsigned char *out, unsigned long *outlen) |
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30 { |
1056 | 31 unsigned char buf[MAXBLOCKSIZE], isha[MAXBLOCKSIZE]; |
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32 unsigned long hashsize, i; |
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33 int hash, err; |
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34 |
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35 LTC_ARGCHK(hmac != NULL); |
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36 LTC_ARGCHK(out != NULL); |
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37 |
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38 /* test hash */ |
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39 hash = hmac->hash; |
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40 if((err = hash_is_valid(hash)) != CRYPT_OK) { |
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41 return err; |
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42 } |
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43 |
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44 /* get the hash message digest size */ |
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45 hashsize = hash_descriptor[hash].hashsize; |
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46 |
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47 /* Get the hash of the first HMAC vector plus the data */ |
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48 if ((err = hash_descriptor[hash].done(&hmac->md, isha)) != CRYPT_OK) { |
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49 goto LBL_ERR; |
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50 } |
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51 |
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52 /* Create the second HMAC vector vector for step (3) */ |
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53 for(i=0; i < HMAC_BLOCKSIZE; i++) { |
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54 buf[i] = hmac->key[i] ^ 0x5C; |
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55 } |
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56 |
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57 /* Now calculate the "outer" hash for step (5), (6), and (7) */ |
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58 if ((err = hash_descriptor[hash].init(&hmac->md)) != CRYPT_OK) { |
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59 goto LBL_ERR; |
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60 } |
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61 if ((err = hash_descriptor[hash].process(&hmac->md, buf, HMAC_BLOCKSIZE)) != CRYPT_OK) { |
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62 goto LBL_ERR; |
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63 } |
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64 if ((err = hash_descriptor[hash].process(&hmac->md, isha, hashsize)) != CRYPT_OK) { |
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65 goto LBL_ERR; |
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66 } |
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67 if ((err = hash_descriptor[hash].done(&hmac->md, buf)) != 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 /* copy to output */ |
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72 for (i = 0; i < hashsize && i < *outlen; i++) { |
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73 out[i] = buf[i]; |
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74 } |
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75 *outlen = i; |
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76 |
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77 err = CRYPT_OK; |
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78 LBL_ERR: |
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79 XFREE(hmac->key); |
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80 #ifdef LTC_CLEAN_STACK |
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81 zeromem(isha, hashsize); |
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82 zeromem(buf, hashsize); |
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83 zeromem(hmac, sizeof(*hmac)); |
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84 #endif |
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85 |
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86 return err; |
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87 } |
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88 |
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89 #endif |
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90 |
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91 /* $Source: /cvs/libtom/libtomcrypt/src/mac/hmac/hmac_done.c,v $ */ |
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92 /* $Revision: 1.5 $ */ |
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93 /* $Date: 2006/11/03 00:39:49 $ */ |