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annotate pkcs_1_oaep_decode.c @ 0:d7da3b1e1540 libtomcrypt

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put back the 0.95 makefile which was inadvertently merged over
author Matt Johnston <matt@ucc.asn.au>
date Mon, 31 May 2004 18:21:40 +0000
parents
children 6362d3854bb4
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0
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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 "mycrypt.h"
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12
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13 /* OAEP Padding for PKCS #1 -- Tom St Denis */
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14
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15 #ifdef PKCS_1
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16
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17 int pkcs_1_oaep_decode(const unsigned char *msg, unsigned long msglen,
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18 const unsigned char *lparam, unsigned long lparamlen,
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19 unsigned long modulus_bitlen, int hash_idx,
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20 unsigned char *out, unsigned long *outlen)
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21 {
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22 unsigned char DB[1024], seed[MAXBLOCKSIZE], mask[sizeof(DB)];
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23 unsigned long hLen, x, y, modulus_len;
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24 int err;
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25
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26 _ARGCHK(msg != NULL);
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27 _ARGCHK(out != NULL);
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28 _ARGCHK(outlen != NULL);
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29
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30 /* test valid hash */
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31 if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) {
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32 return err;
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33 }
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34 hLen = hash_descriptor[hash_idx].hashsize;
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35 modulus_len = (modulus_bitlen >> 3) + (modulus_bitlen & 7 ? 1 : 0);
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36
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37 /* test message size */
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38 if (modulus_len >= sizeof(DB) || msglen != modulus_len) {
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39 return CRYPT_PK_INVALID_SIZE;
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40 }
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41
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42 /* ok so it's now in the form
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43
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44 0x00 || maskedseed || maskedDB
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45
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46 1 || hLen || modulus_len - hLen - 1
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47
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48 */
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49
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50 /* must have leading 0x00 byte */
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51 if (msg[0] != 0x00) {
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52 return CRYPT_INVALID_PACKET;
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53 }
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54
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55 /* now read the masked seed */
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56 for (x = 1, y = 0; y < hLen; y++) {
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57 seed[y] = msg[x++];
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58 }
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59
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60 /* now read the masked DB */
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61 for (y = 0; y < modulus_len - hLen - 1; y++) {
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62 DB[y] = msg[x++];
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63 }
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64
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65 /* compute MGF1 of maskedDB (hLen) */
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66 if ((err = pkcs_1_mgf1(DB, modulus_len - hLen - 1, hash_idx, mask, hLen)) != CRYPT_OK) {
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67 return err;
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68 }
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69
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70 /* XOR against seed */
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71 for (y = 0; y < hLen; y++) {
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72 seed[y] ^= mask[y];
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73 }
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74
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75 /* compute MGF1 of seed (k - hlen - 1) */
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76 if ((err = pkcs_1_mgf1(seed, hLen, hash_idx, mask, modulus_len - hLen - 1)) != CRYPT_OK) {
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77 return err;
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78 }
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79
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80 /* xor against DB */
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81 for (y = 0; y < (modulus_len - hLen - 1); y++) {
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82 DB[y] ^= mask[y];
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83 }
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84
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85 /* now DB == lhash || PS || 0x01 || M, PS == k - mlen - 2hlen - 2 zeroes */
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86
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87 /* compute lhash and store it in seed [reuse temps!] */
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88 x = sizeof(seed);
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89 if (lparam != NULL) {
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90 if ((err = hash_memory(hash_idx, lparam, lparamlen, seed, &x)) != CRYPT_OK) {
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91 return err;
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92 }
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93 } else {
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94 /* can't pass hash_memory a NULL so use DB with zero length */
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95 if ((err = hash_memory(hash_idx, DB, 0, seed, &x)) != CRYPT_OK) {
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96 return err;
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97 }
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98 }
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99
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100 /* compare the lhash'es */
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101 if (memcmp(seed, DB, hLen) != 0) {
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102 return CRYPT_INVALID_PACKET;
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103 }
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104
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105 /* now zeroes before a 0x01 */
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106 for (x = hLen; x < (modulus_len - hLen - 1) && DB[x] == 0x00; x++) {
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107 /* step... */
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108 }
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109
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110 /* error out if wasn't 0x01 */
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111 if (x == (modulus_len - hLen - 1) || DB[x] != 0x01) {
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112 return CRYPT_INVALID_PACKET;
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113 }
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114
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115 /* rest is the message (and skip 0x01) */
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116 if (msglen - ++x > *outlen) {
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117 return CRYPT_BUFFER_OVERFLOW;
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118 }
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119
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120 /* copy message */
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121 *outlen = (modulus_len - hLen - 1) - x;
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122 for (y = 0; x != (modulus_len - hLen - 1); ) {
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123 out[y++] = DB[x++];
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124 }
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125
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126 #ifdef CLEAN_STACK
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127 zeromem(DB, sizeof(DB));
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128 zeromem(seed, sizeof(seed));
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129 zeromem(mask, sizeof(mask));
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130 #endif
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131
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132 return CRYPT_OK;
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133 }
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134
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135 #endif /* PKCS_1 */