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annotate pkcs_1_oaep_encode.c @ 8:059ec00f32a1 libtomcrypt

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Missing ranlib in makefile for library
author Matt Johnston <matt@ucc.asn.au>
date Wed, 02 Jun 2004 08:31:25 +0000
parents d7da3b1e1540
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_encode(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 int prng_idx, prng_state *prng,
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21 unsigned char *out, unsigned long *outlen)
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22 {
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23 unsigned char DB[1024], seed[MAXBLOCKSIZE], mask[sizeof(DB)];
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24 unsigned long hLen, x, y, modulus_len;
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25 int err;
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26
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27 _ARGCHK(msg != NULL);
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28 _ARGCHK(out != NULL);
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29 _ARGCHK(outlen != NULL);
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30
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31 /* test valid hash */
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32 if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) {
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33 return err;
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34 }
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35
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36 /* valid prng */
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37 if ((err = prng_is_valid(prng_idx)) != CRYPT_OK) {
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38 return err;
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39 }
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40
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41 hLen = hash_descriptor[hash_idx].hashsize;
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42 modulus_len = (modulus_bitlen >> 3) + (modulus_bitlen & 7 ? 1 : 0);
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43
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44 /* test message size */
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45 if (modulus_len >= sizeof(DB) || msglen > (modulus_len - 2*hLen - 2)) {
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46 return CRYPT_PK_INVALID_SIZE;
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47 }
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48
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49 /* get lhash */
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50 // DB == lhash || PS || 0x01 || M, PS == k - mlen - 2hlen - 2 zeroes
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51 x = sizeof(DB);
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52 if (lparam != NULL) {
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53 if ((err = hash_memory(hash_idx, lparam, lparamlen, DB, &x)) != CRYPT_OK) {
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54 return err;
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55 }
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56 } else {
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57 /* can't pass hash_memory a NULL so use DB with zero length */
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58 if ((err = hash_memory(hash_idx, DB, 0, DB, &x)) != CRYPT_OK) {
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59 return err;
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60 }
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61 }
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62
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63 /* append PS then 0x01 (to lhash) */
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64 x = hLen;
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65 y = modulus_len - msglen - 2*hLen - 2;
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66 while (y--) {
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67 DB[x++] = 0x00;
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68 }
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69 DB[x++] = 0x01;
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70
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71 /* message */
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72 y = msglen;
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73 while (y--) {
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74 DB[x++] = *msg++;
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75 }
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76
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77 /* now choose a random seed */
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78 if (prng_descriptor[prng_idx].read(seed, hLen, prng) != hLen) {
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79 return CRYPT_ERROR_READPRNG;
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80 }
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81
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82 /* compute MGF1 of seed (k - hlen - 1) */
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83 if ((err = pkcs_1_mgf1(seed, hLen, hash_idx, mask, modulus_len - hLen - 1)) != CRYPT_OK) {
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84 return err;
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85 }
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86
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87 /* xor against DB */
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88 for (y = 0; y < (modulus_len - hLen - 1); y++) {
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89 DB[y] ^= mask[y];
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90 }
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91
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92 /* compute MGF1 of maskedDB (hLen) */
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93 if ((err = pkcs_1_mgf1(DB, modulus_len - hLen - 1, hash_idx, mask, hLen)) != CRYPT_OK) {
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94 return err;
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95 }
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96
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97 /* XOR against seed */
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98 for (y = 0; y < hLen; y++) {
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99 seed[y] ^= mask[y];
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100 }
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101
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102 /* create string of length modulus_len */
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103 if (*outlen < modulus_len) {
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104 return CRYPT_BUFFER_OVERFLOW;
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105 }
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106
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107 /* start output which is 0x00 || maskedSeed || maskedDB */
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108 x = 0;
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109 out[x++] = 0x00;
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110 for (y = 0; y < hLen; y++) {
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111 out[x++] = seed[y];
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112 }
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113 for (y = 0; y < modulus_len - hLen - 1; y++) {
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114 out[x++] = DB[y];
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115 }
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116 *outlen = x;
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117
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118 #ifdef CLEAN_STACK
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119 zeromem(DB, sizeof(DB));
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120 zeromem(seed, sizeof(seed));
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121 zeromem(mask, sizeof(mask));
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122 #endif
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123
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124 return CRYPT_OK;
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125 }
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126
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127 #endif /* PKCS_1 */
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128