1 | /*
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2 | * Copyright 1999-2016 The OpenSSL Project Authors. All Rights Reserved.
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3 | *
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4 | * Licensed under the OpenSSL license (the "License"). You may not use
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5 | * this file except in compliance with the License. You can obtain a copy
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6 | * in the file LICENSE in the source distribution or at
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7 | * https://www.openssl.org/source/license.html
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8 | */
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9 |
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10 | #include <stdio.h>
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11 | #include "internal/cryptlib.h"
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12 | #include <openssl/pkcs12.h>
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13 | #include <openssl/bn.h>
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14 |
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15 | /* Uncomment out this line to get debugging info about key generation */
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16 | /*
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17 | * #define OPENSSL_DEBUG_KEYGEN
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18 | */
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19 | #ifdef OPENSSL_DEBUG_KEYGEN
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20 | # include <openssl/bio.h>
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21 | extern BIO *bio_err;
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22 | void h__dump(unsigned char *p, int len);
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23 | #endif
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24 |
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25 | /* PKCS12 compatible key/IV generation */
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26 | #ifndef min
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27 | # define min(a,b) ((a) < (b) ? (a) : (b))
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28 | #endif
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29 |
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30 | int PKCS12_key_gen_asc(const char *pass, int passlen, unsigned char *salt,
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31 | int saltlen, int id, int iter, int n,
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32 | unsigned char *out, const EVP_MD *md_type)
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33 | {
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34 | int ret;
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35 | unsigned char *unipass;
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36 | int uniplen;
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37 |
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38 | if (!pass) {
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39 | unipass = NULL;
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40 | uniplen = 0;
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41 | } else if (!OPENSSL_asc2uni(pass, passlen, &unipass, &uniplen)) {
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42 | PKCS12err(PKCS12_F_PKCS12_KEY_GEN_ASC, ERR_R_MALLOC_FAILURE);
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43 | return 0;
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44 | }
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45 | ret = PKCS12_key_gen_uni(unipass, uniplen, salt, saltlen,
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46 | id, iter, n, out, md_type);
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47 | if (ret <= 0)
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48 | return 0;
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49 | OPENSSL_clear_free(unipass, uniplen);
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50 | return ret;
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51 | }
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52 |
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53 | int PKCS12_key_gen_utf8(const char *pass, int passlen, unsigned char *salt,
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54 | int saltlen, int id, int iter, int n,
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55 | unsigned char *out, const EVP_MD *md_type)
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56 | {
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57 | int ret;
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58 | unsigned char *unipass;
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59 | int uniplen;
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60 |
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61 | if (!pass) {
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62 | unipass = NULL;
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63 | uniplen = 0;
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64 | } else if (!OPENSSL_utf82uni(pass, passlen, &unipass, &uniplen)) {
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65 | PKCS12err(PKCS12_F_PKCS12_KEY_GEN_UTF8, ERR_R_MALLOC_FAILURE);
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66 | return 0;
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67 | }
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68 | ret = PKCS12_key_gen_uni(unipass, uniplen, salt, saltlen,
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69 | id, iter, n, out, md_type);
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70 | if (ret <= 0)
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71 | return 0;
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72 | OPENSSL_clear_free(unipass, uniplen);
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73 | return ret;
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74 | }
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75 |
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76 | int PKCS12_key_gen_uni(unsigned char *pass, int passlen, unsigned char *salt,
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77 | int saltlen, int id, int iter, int n,
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78 | unsigned char *out, const EVP_MD *md_type)
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79 | {
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80 | unsigned char *B = NULL, *D = NULL, *I = NULL, *p = NULL, *Ai = NULL;
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81 | int Slen, Plen, Ilen, Ijlen;
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82 | int i, j, u, v;
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83 | int ret = 0;
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84 | BIGNUM *Ij = NULL, *Bpl1 = NULL; /* These hold Ij and B + 1 */
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85 | EVP_MD_CTX *ctx = NULL;
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86 | #ifdef OPENSSL_DEBUG_KEYGEN
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87 | unsigned char *tmpout = out;
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88 | int tmpn = n;
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89 | #endif
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90 |
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91 | ctx = EVP_MD_CTX_new();
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92 | if (ctx == NULL)
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93 | goto err;
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94 |
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95 | #ifdef OPENSSL_DEBUG_KEYGEN
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96 | fprintf(stderr, "KEYGEN DEBUG\n");
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97 | fprintf(stderr, "ID %d, ITER %d\n", id, iter);
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98 | fprintf(stderr, "Password (length %d):\n", passlen);
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99 | h__dump(pass, passlen);
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100 | fprintf(stderr, "Salt (length %d):\n", saltlen);
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101 | h__dump(salt, saltlen);
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102 | #endif
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103 | v = EVP_MD_block_size(md_type);
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104 | u = EVP_MD_size(md_type);
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105 | if (u < 0 || v <= 0)
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106 | goto err;
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107 | D = OPENSSL_malloc(v);
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108 | Ai = OPENSSL_malloc(u);
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109 | B = OPENSSL_malloc(v + 1);
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110 | Slen = v * ((saltlen + v - 1) / v);
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111 | if (passlen)
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112 | Plen = v * ((passlen + v - 1) / v);
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113 | else
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114 | Plen = 0;
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115 | Ilen = Slen + Plen;
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116 | I = OPENSSL_malloc(Ilen);
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117 | Ij = BN_new();
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118 | Bpl1 = BN_new();
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119 | if (D == NULL || Ai == NULL || B == NULL || I == NULL || Ij == NULL
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120 | || Bpl1 == NULL)
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121 | goto err;
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122 | for (i = 0; i < v; i++)
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123 | D[i] = id;
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124 | p = I;
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125 | for (i = 0; i < Slen; i++)
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126 | *p++ = salt[i % saltlen];
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127 | for (i = 0; i < Plen; i++)
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128 | *p++ = pass[i % passlen];
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129 | for (;;) {
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130 | if (!EVP_DigestInit_ex(ctx, md_type, NULL)
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131 | || !EVP_DigestUpdate(ctx, D, v)
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132 | || !EVP_DigestUpdate(ctx, I, Ilen)
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133 | || !EVP_DigestFinal_ex(ctx, Ai, NULL))
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134 | goto err;
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135 | for (j = 1; j < iter; j++) {
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136 | if (!EVP_DigestInit_ex(ctx, md_type, NULL)
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137 | || !EVP_DigestUpdate(ctx, Ai, u)
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138 | || !EVP_DigestFinal_ex(ctx, Ai, NULL))
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139 | goto err;
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140 | }
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141 | memcpy(out, Ai, min(n, u));
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142 | if (u >= n) {
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143 | #ifdef OPENSSL_DEBUG_KEYGEN
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144 | fprintf(stderr, "Output KEY (length %d)\n", tmpn);
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145 | h__dump(tmpout, tmpn);
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146 | #endif
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147 | ret = 1;
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148 | goto end;
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149 | }
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150 | n -= u;
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151 | out += u;
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152 | for (j = 0; j < v; j++)
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153 | B[j] = Ai[j % u];
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154 | /* Work out B + 1 first then can use B as tmp space */
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155 | if (!BN_bin2bn(B, v, Bpl1))
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156 | goto err;
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157 | if (!BN_add_word(Bpl1, 1))
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158 | goto err;
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159 | for (j = 0; j < Ilen; j += v) {
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160 | if (!BN_bin2bn(I + j, v, Ij))
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161 | goto err;
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162 | if (!BN_add(Ij, Ij, Bpl1))
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163 | goto err;
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164 | if (!BN_bn2bin(Ij, B))
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165 | goto err;
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166 | Ijlen = BN_num_bytes(Ij);
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167 | /* If more than 2^(v*8) - 1 cut off MSB */
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168 | if (Ijlen > v) {
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169 | if (!BN_bn2bin(Ij, B))
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170 | goto err;
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171 | memcpy(I + j, B + 1, v);
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172 | #ifndef PKCS12_BROKEN_KEYGEN
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173 | /* If less than v bytes pad with zeroes */
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174 | } else if (Ijlen < v) {
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175 | memset(I + j, 0, v - Ijlen);
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176 | if (!BN_bn2bin(Ij, I + j + v - Ijlen))
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177 | goto err;
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178 | #endif
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179 | } else if (!BN_bn2bin(Ij, I + j))
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180 | goto err;
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181 | }
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182 | }
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183 |
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184 | err:
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185 | PKCS12err(PKCS12_F_PKCS12_KEY_GEN_UNI, ERR_R_MALLOC_FAILURE);
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186 |
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187 | end:
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188 | OPENSSL_free(Ai);
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189 | OPENSSL_free(B);
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190 | OPENSSL_free(D);
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191 | OPENSSL_free(I);
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192 | BN_free(Ij);
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193 | BN_free(Bpl1);
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194 | EVP_MD_CTX_free(ctx);
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195 | return ret;
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196 | }
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197 |
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198 | #ifdef OPENSSL_DEBUG_KEYGEN
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199 | void h__dump(unsigned char *p, int len)
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200 | {
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201 | for (; len--; p++)
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202 | fprintf(stderr, "%02X", *p);
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203 | fprintf(stderr, "\n");
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204 | }
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205 | #endif
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