Mercurial > dropbear
annotate libtomcrypt/src/pk/pkcs1/pkcs_1_mgf1.c @ 397:2908122e9eed channel-fix
disapproval of revision '1250b8af44b62d8f4fe0f8d9fc7e7a1cc34e7e1c'
author | Matt Johnston <matt@ucc.asn.au> |
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date | Sat, 03 Feb 2007 08:10:09 +0000 |
parents | 1b9e69c058d2 |
children | 0cbe8f6dbf9e |
rev | line source |
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285
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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.org |
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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 pkcs_1_mgf1.c |
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15 The Mask Generation Function (MGF1) for PKCS #1, Tom St Denis |
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16 */ |
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17 |
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18 #ifdef PKCS_1 |
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19 |
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20 /** |
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21 Perform PKCS #1 MGF1 (internal) |
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22 @param seed The seed for MGF1 |
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23 @param seedlen The length of the seed |
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24 @param hash_idx The index of the hash desired |
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25 @param mask [out] The destination |
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26 @param masklen The length of the mask desired |
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27 @return CRYPT_OK if successful |
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28 */ |
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29 int pkcs_1_mgf1(const unsigned char *seed, unsigned long seedlen, |
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30 int hash_idx, |
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31 unsigned char *mask, unsigned long masklen) |
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32 { |
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33 unsigned long hLen, x; |
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34 ulong32 counter; |
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35 int err; |
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36 hash_state *md; |
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37 unsigned char *buf; |
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38 |
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39 LTC_ARGCHK(seed != NULL); |
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40 LTC_ARGCHK(mask != NULL); |
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41 |
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42 /* ensure valid hash */ |
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43 if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) { |
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44 return err; |
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45 } |
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46 |
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47 /* get hash output size */ |
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48 hLen = hash_descriptor[hash_idx].hashsize; |
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49 |
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50 /* allocate memory */ |
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51 md = XMALLOC(sizeof(hash_state)); |
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52 buf = XMALLOC(hLen); |
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53 if (md == NULL || buf == NULL) { |
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54 if (md != NULL) { |
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55 XFREE(md); |
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56 } |
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57 if (buf != NULL) { |
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58 XFREE(buf); |
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59 } |
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60 return CRYPT_MEM; |
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61 } |
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62 |
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63 /* start counter */ |
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64 counter = 0; |
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65 |
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66 while (masklen > 0) { |
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67 /* handle counter */ |
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68 STORE32H(counter, buf); |
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69 ++counter; |
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70 |
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71 /* get hash of seed || counter */ |
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72 if ((err = hash_descriptor[hash_idx].init(md)) != CRYPT_OK) { |
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73 goto LBL_ERR; |
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74 } |
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75 if ((err = hash_descriptor[hash_idx].process(md, seed, seedlen)) != CRYPT_OK) { |
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76 goto LBL_ERR; |
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77 } |
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78 if ((err = hash_descriptor[hash_idx].process(md, buf, 4)) != CRYPT_OK) { |
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79 goto LBL_ERR; |
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80 } |
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81 if ((err = hash_descriptor[hash_idx].done(md, buf)) != CRYPT_OK) { |
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82 goto LBL_ERR; |
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83 } |
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84 |
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85 /* store it */ |
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86 for (x = 0; x < hLen && masklen > 0; x++, masklen--) { |
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87 *mask++ = buf[x]; |
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88 } |
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89 } |
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90 |
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91 err = CRYPT_OK; |
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92 LBL_ERR: |
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93 #ifdef LTC_CLEAN_STACK |
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94 zeromem(buf, hLen); |
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95 zeromem(md, sizeof(hash_state)); |
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96 #endif |
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97 |
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98 XFREE(buf); |
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99 XFREE(md); |
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100 |
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101 return err; |
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102 } |
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103 |
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104 #endif /* PKCS_1 */ |
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105 |
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106 /* $Source: /cvs/libtom/libtomcrypt/src/pk/pkcs1/pkcs_1_mgf1.c,v $ */ |
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107 /* $Revision: 1.4 $ */ |
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108 /* $Date: 2005/05/05 14:35:59 $ */ |