Mercurial > dropbear
annotate libtomcrypt/src/misc/pkcs5/pkcs_5_2.c @ 1668:49cb3cf4bd6f
When explicitly passing --disable-fuzz to ./configure fuzz was actually
enabled.
Signed-off-by: Alexander Dahl <[email protected]>
author | Alexander Dahl <ada@thorsis.com> |
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date | Fri, 27 Mar 2020 23:23:11 +0800 |
parents | 6dba84798cd5 |
children |
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_5_2.c |
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13 PKCS #5, Algorithm #2, Tom St Denis |
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14 */ |
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15 #ifdef LTC_PKCS_5 |
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16 |
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17 /** |
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18 Execute PKCS #5 v2 |
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19 @param password The input password (or key) |
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20 @param password_len The length of the password (octets) |
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21 @param salt The salt (or nonce) |
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22 @param salt_len The length of the salt (octets) |
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23 @param iteration_count # of iterations desired for PKCS #5 v2 [read specs for more] |
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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_alg2(const unsigned char *password, unsigned long password_len, |
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30 const unsigned char *salt, unsigned long salt_len, |
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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, itts; |
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35 ulong32 blkno; |
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36 unsigned long stored, left, x, y; |
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37 unsigned char *buf[2]; |
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38 hmac_state *hmac; |
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39 |
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40 LTC_ARGCHK(password != NULL); |
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41 LTC_ARGCHK(salt != NULL); |
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42 LTC_ARGCHK(out != NULL); |
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43 LTC_ARGCHK(outlen != NULL); |
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44 |
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45 /* test hash IDX */ |
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46 if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) { |
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47 return err; |
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48 } |
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49 |
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50 buf[0] = XMALLOC(MAXBLOCKSIZE * 2); |
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51 hmac = XMALLOC(sizeof(hmac_state)); |
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52 if (hmac == NULL || buf[0] == NULL) { |
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53 if (hmac != NULL) { |
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54 XFREE(hmac); |
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55 } |
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56 if (buf[0] != NULL) { |
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57 XFREE(buf[0]); |
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58 } |
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59 return CRYPT_MEM; |
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60 } |
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61 /* buf[1] points to the second block of MAXBLOCKSIZE bytes */ |
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62 buf[1] = buf[0] + MAXBLOCKSIZE; |
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63 |
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64 left = *outlen; |
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65 blkno = 1; |
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66 stored = 0; |
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67 while (left != 0) { |
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68 /* process block number blkno */ |
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69 zeromem(buf[0], MAXBLOCKSIZE*2); |
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70 |
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71 /* store current block number and increment for next pass */ |
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72 STORE32H(blkno, buf[1]); |
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73 ++blkno; |
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74 |
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75 /* get PRF(P, S||int(blkno)) */ |
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76 if ((err = hmac_init(hmac, hash_idx, password, password_len)) != CRYPT_OK) { |
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77 goto LBL_ERR; |
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78 } |
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79 if ((err = hmac_process(hmac, salt, salt_len)) != CRYPT_OK) { |
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80 goto LBL_ERR; |
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81 } |
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82 if ((err = hmac_process(hmac, buf[1], 4)) != CRYPT_OK) { |
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83 goto LBL_ERR; |
1b9e69c058d2
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84 } |
1b9e69c058d2
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85 x = MAXBLOCKSIZE; |
1b9e69c058d2
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86 if ((err = hmac_done(hmac, buf[0], &x)) != CRYPT_OK) { |
1b9e69c058d2
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87 goto LBL_ERR; |
1b9e69c058d2
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88 } |
1b9e69c058d2
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89 |
1b9e69c058d2
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90 /* now compute repeated and XOR it in buf[1] */ |
1b9e69c058d2
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91 XMEMCPY(buf[1], buf[0], x); |
1b9e69c058d2
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92 for (itts = 1; itts < iteration_count; ++itts) { |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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93 if ((err = hmac_memory(hash_idx, password, password_len, buf[0], x, buf[0], &x)) != CRYPT_OK) { |
1b9e69c058d2
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94 goto LBL_ERR; |
1b9e69c058d2
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95 } |
1b9e69c058d2
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96 for (y = 0; y < x; y++) { |
1b9e69c058d2
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97 buf[1][y] ^= buf[0][y]; |
1b9e69c058d2
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98 } |
1b9e69c058d2
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99 } |
1b9e69c058d2
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100 |
1b9e69c058d2
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101 /* now emit upto x bytes of buf[1] to output */ |
1b9e69c058d2
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102 for (y = 0; y < x && left != 0; ++y) { |
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Matt Johnston <matt@ucc.asn.au>
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103 out[stored++] = buf[1][y]; |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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104 --left; |
1b9e69c058d2
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105 } |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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106 } |
1b9e69c058d2
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107 *outlen = stored; |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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108 |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
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109 err = CRYPT_OK; |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
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110 LBL_ERR: |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
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111 #ifdef LTC_CLEAN_STACK |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
parents:
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112 zeromem(buf[0], MAXBLOCKSIZE*2); |
1b9e69c058d2
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Matt Johnston <matt@ucc.asn.au>
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113 zeromem(hmac, sizeof(hmac_state)); |
1b9e69c058d2
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114 #endif |
1b9e69c058d2
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115 |
1b9e69c058d2
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116 XFREE(hmac); |
1b9e69c058d2
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117 XFREE(buf[0]); |
1b9e69c058d2
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118 |
1b9e69c058d2
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119 return err; |
1b9e69c058d2
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120 } |
1b9e69c058d2
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121 |
1b9e69c058d2
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122 #endif |
1b9e69c058d2
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123 |
1b9e69c058d2
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parents:
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124 |
1471
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
1435
diff
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|
125 /* ref: $Format:%D$ */ |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
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diff
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126 /* git commit: $Format:%H$ */ |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
1435
diff
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|
127 /* commit time: $Format:%ai$ */ |