Mercurial > dropbear
annotate libtomcrypt/src/misc/pkcs5/pkcs_5_1.c @ 652:17962b2a6b8f
- Make sure we don't use channel-specific data after it has been freed
with a ChanType->closehandler()
author | Matt Johnston <matt@ucc.asn.au> |
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date | Sun, 04 Dec 2011 05:27:29 +0800 (2011-12-03) |
parents | 0cbe8f6dbf9e |
children | f849a5ca2efc |
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 * |
382
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9 * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.com |
285
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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_5_1.c |
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15 PKCS #5, Algorithm #1, Tom St Denis |
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16 */ |
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17 #ifdef PKCS_5 |
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18 /** |
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19 Execute PKCS #5 v1 |
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20 @param password The password (or key) |
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21 @param password_len The length of the password (octet) |
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22 @param salt The salt (or nonce) which is 8 octets long |
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23 @param iteration_count The PKCS #5 v1 iteration count |
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24 @param hash_idx The index of the hash desired |
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25 @param out [out] The destination for this algorithm |
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26 @param outlen [in/out] The max size and resulting size of the algorithm output |
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27 @return CRYPT_OK if successful |
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28 */ |
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29 int pkcs_5_alg1(const unsigned char *password, unsigned long password_len, |
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30 const unsigned char *salt, |
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31 int iteration_count, int hash_idx, |
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32 unsigned char *out, unsigned long *outlen) |
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33 { |
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34 int err; |
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35 unsigned long x; |
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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(password != NULL); |
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40 LTC_ARGCHK(salt != 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 /* test hash IDX */ |
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45 if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) { |
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46 return err; |
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47 } |
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48 |
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49 /* allocate memory */ |
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50 md = XMALLOC(sizeof(hash_state)); |
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51 buf = XMALLOC(MAXBLOCKSIZE); |
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52 if (md == NULL || buf == NULL) { |
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53 if (md != NULL) { |
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54 XFREE(md); |
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55 } |
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56 if (buf != NULL) { |
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57 XFREE(buf); |
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58 } |
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59 return CRYPT_MEM; |
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60 } |
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61 |
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62 /* hash initial password + salt */ |
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63 if ((err = hash_descriptor[hash_idx].init(md)) != CRYPT_OK) { |
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64 goto LBL_ERR; |
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65 } |
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66 if ((err = hash_descriptor[hash_idx].process(md, password, password_len)) != CRYPT_OK) { |
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67 goto LBL_ERR; |
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68 } |
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69 if ((err = hash_descriptor[hash_idx].process(md, salt, 8)) != CRYPT_OK) { |
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70 goto LBL_ERR; |
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71 } |
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72 if ((err = hash_descriptor[hash_idx].done(md, buf)) != CRYPT_OK) { |
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73 goto LBL_ERR; |
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74 } |
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75 |
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76 while (--iteration_count) { |
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77 /* code goes here. */ |
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78 x = MAXBLOCKSIZE; |
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79 if ((err = hash_memory(hash_idx, buf, hash_descriptor[hash_idx].hashsize, buf, &x)) != 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 |
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84 /* copy upto outlen bytes */ |
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85 for (x = 0; x < hash_descriptor[hash_idx].hashsize && x < *outlen; x++) { |
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86 out[x] = buf[x]; |
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87 } |
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88 *outlen = x; |
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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, MAXBLOCKSIZE); |
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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 |
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103 |
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104 /* $Source: /cvs/libtom/libtomcrypt/src/misc/pkcs5/pkcs_5_1.c,v $ */ |
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105 /* $Revision: 1.5 $ */ |
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106 /* $Date: 2006/03/31 14:15:35 $ */ |