Mercurial > dropbear
annotate libtomcrypt/src/pk/pkcs1/pkcs_1_mgf1.c @ 1524:d35cf9a5e0b5
rename default_options.h.in in docs too
author | Matt Johnston <matt@ucc.asn.au> |
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date | Tue, 20 Feb 2018 19:29:55 +0800 |
parents | 6dba84798cd5 |
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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 #include "tomcrypt.h" |
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10 |
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11 /** |
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12 @file pkcs_1_mgf1.c |
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13 The Mask Generation Function (MGF1) for PKCS #1, Tom St Denis |
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14 */ |
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15 |
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16 #ifdef LTC_PKCS_1 |
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17 |
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18 /** |
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19 Perform PKCS #1 MGF1 (internal) |
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20 @param hash_idx The index of the hash desired |
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21 @param seed The seed for MGF1 |
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22 @param seedlen The length of the seed |
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23 @param mask [out] The destination |
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24 @param masklen The length of the mask desired |
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25 @return CRYPT_OK if successful |
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26 */ |
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27 int pkcs_1_mgf1(int hash_idx, |
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28 const unsigned char *seed, unsigned long seedlen, |
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29 unsigned char *mask, unsigned long masklen) |
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30 { |
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31 unsigned long hLen, x; |
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32 ulong32 counter; |
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33 int err; |
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34 hash_state *md; |
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35 unsigned char *buf; |
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36 |
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37 LTC_ARGCHK(seed != NULL); |
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38 LTC_ARGCHK(mask != NULL); |
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39 |
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40 /* ensure valid hash */ |
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41 if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) { |
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42 return err; |
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43 } |
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44 |
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45 /* get hash output size */ |
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46 hLen = hash_descriptor[hash_idx].hashsize; |
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47 |
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48 /* allocate memory */ |
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49 md = XMALLOC(sizeof(hash_state)); |
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50 buf = XMALLOC(hLen); |
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51 if (md == NULL || buf == NULL) { |
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52 if (md != NULL) { |
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53 XFREE(md); |
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54 } |
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55 if (buf != NULL) { |
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56 XFREE(buf); |
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57 } |
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58 return CRYPT_MEM; |
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59 } |
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60 |
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61 /* start counter */ |
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62 counter = 0; |
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63 |
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64 while (masklen > 0) { |
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65 /* handle counter */ |
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66 STORE32H(counter, buf); |
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67 ++counter; |
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68 |
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69 /* get hash of seed || counter */ |
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70 if ((err = hash_descriptor[hash_idx].init(md)) != CRYPT_OK) { |
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71 goto LBL_ERR; |
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72 } |
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73 if ((err = hash_descriptor[hash_idx].process(md, seed, seedlen)) != CRYPT_OK) { |
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74 goto LBL_ERR; |
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75 } |
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76 if ((err = hash_descriptor[hash_idx].process(md, buf, 4)) != CRYPT_OK) { |
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77 goto LBL_ERR; |
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78 } |
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79 if ((err = hash_descriptor[hash_idx].done(md, buf)) != CRYPT_OK) { |
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80 goto LBL_ERR; |
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81 } |
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82 |
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83 /* store it */ |
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84 for (x = 0; x < hLen && masklen > 0; x++, masklen--) { |
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85 *mask++ = buf[x]; |
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86 } |
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87 } |
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88 |
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89 err = CRYPT_OK; |
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90 LBL_ERR: |
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91 #ifdef LTC_CLEAN_STACK |
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92 zeromem(buf, hLen); |
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93 zeromem(md, sizeof(hash_state)); |
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94 #endif |
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95 |
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96 XFREE(buf); |
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97 XFREE(md); |
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98 |
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99 return err; |
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100 } |
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101 |
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102 #endif /* LTC_PKCS_1 */ |
285
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103 |
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104 /* ref: $Format:%D$ */ |
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105 /* git commit: $Format:%H$ */ |
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106 /* commit time: $Format:%ai$ */ |