1 | /*
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2 | * Copyright 1995-2016 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 <openssl/crypto.h>
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12 | #include "internal/cryptlib.h"
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13 | #include <openssl/lhash.h>
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14 | #include "internal/bn_int.h"
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15 | #include <openssl/engine.h>
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16 | #include "rsa_locl.h"
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17 |
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18 | static const RSA_METHOD *default_RSA_meth = NULL;
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19 |
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20 | RSA *RSA_new(void)
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21 | {
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22 | RSA *r = RSA_new_method(NULL);
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23 |
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24 | return r;
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25 | }
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26 |
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27 | void RSA_set_default_method(const RSA_METHOD *meth)
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28 | {
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29 | default_RSA_meth = meth;
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30 | }
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31 |
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32 | const RSA_METHOD *RSA_get_default_method(void)
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33 | {
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34 | if (default_RSA_meth == NULL) {
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35 | #ifdef RSA_NULL
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36 | default_RSA_meth = RSA_null_method();
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37 | #else
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38 | default_RSA_meth = RSA_PKCS1_OpenSSL();
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39 | #endif
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40 | }
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41 |
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42 | return default_RSA_meth;
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43 | }
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44 |
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45 | const RSA_METHOD *RSA_get_method(const RSA *rsa)
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46 | {
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47 | return rsa->meth;
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48 | }
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49 |
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50 | int RSA_set_method(RSA *rsa, const RSA_METHOD *meth)
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51 | {
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52 | /*
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53 | * NB: The caller is specifically setting a method, so it's not up to us
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54 | * to deal with which ENGINE it comes from.
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55 | */
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56 | const RSA_METHOD *mtmp;
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57 | mtmp = rsa->meth;
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58 | if (mtmp->finish)
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59 | mtmp->finish(rsa);
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60 | #ifndef OPENSSL_NO_ENGINE
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61 | ENGINE_finish(rsa->engine);
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62 | rsa->engine = NULL;
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63 | #endif
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64 | rsa->meth = meth;
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65 | if (meth->init)
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66 | meth->init(rsa);
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67 | return 1;
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68 | }
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69 |
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70 | RSA *RSA_new_method(ENGINE *engine)
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71 | {
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72 | RSA *ret = OPENSSL_zalloc(sizeof(*ret));
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73 |
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74 | if (ret == NULL) {
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75 | RSAerr(RSA_F_RSA_NEW_METHOD, ERR_R_MALLOC_FAILURE);
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76 | return NULL;
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77 | }
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78 |
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79 | ret->references = 1;
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80 | ret->lock = CRYPTO_THREAD_lock_new();
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81 | if (ret->lock == NULL) {
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82 | RSAerr(RSA_F_RSA_NEW_METHOD, ERR_R_MALLOC_FAILURE);
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83 | OPENSSL_free(ret);
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84 | return NULL;
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85 | }
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86 |
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87 | ret->meth = RSA_get_default_method();
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88 | #ifndef OPENSSL_NO_ENGINE
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89 | ret->flags = ret->meth->flags & ~RSA_FLAG_NON_FIPS_ALLOW;
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90 | if (engine) {
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91 | if (!ENGINE_init(engine)) {
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92 | RSAerr(RSA_F_RSA_NEW_METHOD, ERR_R_ENGINE_LIB);
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93 | goto err;
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94 | }
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95 | ret->engine = engine;
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96 | } else
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97 | ret->engine = ENGINE_get_default_RSA();
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98 | if (ret->engine) {
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99 | ret->meth = ENGINE_get_RSA(ret->engine);
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100 | if (ret->meth == NULL) {
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101 | RSAerr(RSA_F_RSA_NEW_METHOD, ERR_R_ENGINE_LIB);
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102 | goto err;
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103 | }
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104 | }
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105 | #endif
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106 |
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107 | ret->flags = ret->meth->flags & ~RSA_FLAG_NON_FIPS_ALLOW;
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108 | if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_RSA, ret, &ret->ex_data)) {
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109 | goto err;
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110 | }
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111 |
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112 | if ((ret->meth->init != NULL) && !ret->meth->init(ret)) {
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113 | RSAerr(RSA_F_RSA_NEW_METHOD, ERR_R_INIT_FAIL);
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114 | goto err;
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115 | }
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116 |
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117 | return ret;
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118 |
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119 | err:
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120 | RSA_free(ret);
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121 | return NULL;
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122 | }
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123 |
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124 | void RSA_free(RSA *r)
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125 | {
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126 | int i;
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127 |
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128 | if (r == NULL)
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129 | return;
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130 |
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131 | CRYPTO_atomic_add(&r->references, -1, &i, r->lock);
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132 | REF_PRINT_COUNT("RSA", r);
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133 | if (i > 0)
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134 | return;
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135 | REF_ASSERT_ISNT(i < 0);
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136 |
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137 | if (r->meth->finish)
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138 | r->meth->finish(r);
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139 | #ifndef OPENSSL_NO_ENGINE
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140 | ENGINE_finish(r->engine);
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141 | #endif
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142 |
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143 | CRYPTO_free_ex_data(CRYPTO_EX_INDEX_RSA, r, &r->ex_data);
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144 |
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145 | CRYPTO_THREAD_lock_free(r->lock);
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146 |
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147 | BN_clear_free(r->n);
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148 | BN_clear_free(r->e);
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149 | BN_clear_free(r->d);
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150 | BN_clear_free(r->p);
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151 | BN_clear_free(r->q);
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152 | BN_clear_free(r->dmp1);
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153 | BN_clear_free(r->dmq1);
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154 | BN_clear_free(r->iqmp);
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155 | BN_BLINDING_free(r->blinding);
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156 | BN_BLINDING_free(r->mt_blinding);
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157 | OPENSSL_free(r->bignum_data);
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158 | OPENSSL_free(r);
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159 | }
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160 |
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161 | int RSA_up_ref(RSA *r)
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162 | {
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163 | int i;
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164 |
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165 | if (CRYPTO_atomic_add(&r->references, 1, &i, r->lock) <= 0)
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166 | return 0;
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167 |
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168 | REF_PRINT_COUNT("RSA", r);
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169 | REF_ASSERT_ISNT(i < 2);
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170 | return ((i > 1) ? 1 : 0);
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171 | }
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172 |
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173 | int RSA_set_ex_data(RSA *r, int idx, void *arg)
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174 | {
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175 | return (CRYPTO_set_ex_data(&r->ex_data, idx, arg));
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176 | }
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177 |
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178 | void *RSA_get_ex_data(const RSA *r, int idx)
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179 | {
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180 | return (CRYPTO_get_ex_data(&r->ex_data, idx));
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181 | }
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182 |
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183 | int RSA_security_bits(const RSA *rsa)
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184 | {
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185 | return BN_security_bits(BN_num_bits(rsa->n), -1);
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186 | }
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187 |
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188 | int RSA_set0_key(RSA *r, BIGNUM *n, BIGNUM *e, BIGNUM *d)
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189 | {
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190 | /* If the fields n and e in r are NULL, the corresponding input
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191 | * parameters MUST be non-NULL for n and e. d may be
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192 | * left NULL (in case only the public key is used).
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193 | */
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194 | if ((r->n == NULL && n == NULL)
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195 | || (r->e == NULL && e == NULL))
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196 | return 0;
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197 |
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198 | if (n != NULL) {
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199 | BN_free(r->n);
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200 | r->n = n;
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201 | }
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202 | if (e != NULL) {
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203 | BN_free(r->e);
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204 | r->e = e;
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205 | }
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206 | if (d != NULL) {
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207 | BN_free(r->d);
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208 | r->d = d;
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209 | }
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210 |
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211 | return 1;
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212 | }
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213 |
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214 | int RSA_set0_factors(RSA *r, BIGNUM *p, BIGNUM *q)
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215 | {
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216 | /* If the fields p and q in r are NULL, the corresponding input
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217 | * parameters MUST be non-NULL.
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218 | */
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219 | if ((r->p == NULL && p == NULL)
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220 | || (r->q == NULL && q == NULL))
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221 | return 0;
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222 |
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223 | if (p != NULL) {
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224 | BN_free(r->p);
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225 | r->p = p;
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226 | }
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227 | if (q != NULL) {
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228 | BN_free(r->q);
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229 | r->q = q;
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230 | }
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231 |
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232 | return 1;
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233 | }
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234 |
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235 | int RSA_set0_crt_params(RSA *r, BIGNUM *dmp1, BIGNUM *dmq1, BIGNUM *iqmp)
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236 | {
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237 | /* If the fields dmp1, dmq1 and iqmp in r are NULL, the corresponding input
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238 | * parameters MUST be non-NULL.
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239 | */
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240 | if ((r->dmp1 == NULL && dmp1 == NULL)
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241 | || (r->dmq1 == NULL && dmq1 == NULL)
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242 | || (r->iqmp == NULL && iqmp == NULL))
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243 | return 0;
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244 |
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245 | if (dmp1 != NULL) {
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246 | BN_free(r->dmp1);
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247 | r->dmp1 = dmp1;
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248 | }
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249 | if (dmq1 != NULL) {
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250 | BN_free(r->dmq1);
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251 | r->dmq1 = dmq1;
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252 | }
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253 | if (iqmp != NULL) {
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254 | BN_free(r->iqmp);
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255 | r->iqmp = iqmp;
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256 | }
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257 |
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258 | return 1;
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259 | }
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260 |
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261 | void RSA_get0_key(const RSA *r,
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262 | const BIGNUM **n, const BIGNUM **e, const BIGNUM **d)
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263 | {
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264 | if (n != NULL)
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265 | *n = r->n;
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266 | if (e != NULL)
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267 | *e = r->e;
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268 | if (d != NULL)
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269 | *d = r->d;
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270 | }
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271 |
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272 | void RSA_get0_factors(const RSA *r, const BIGNUM **p, const BIGNUM **q)
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273 | {
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274 | if (p != NULL)
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275 | *p = r->p;
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276 | if (q != NULL)
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277 | *q = r->q;
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278 | }
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279 |
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280 | void RSA_get0_crt_params(const RSA *r,
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281 | const BIGNUM **dmp1, const BIGNUM **dmq1,
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282 | const BIGNUM **iqmp)
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283 | {
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284 | if (dmp1 != NULL)
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285 | *dmp1 = r->dmp1;
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286 | if (dmq1 != NULL)
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287 | *dmq1 = r->dmq1;
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288 | if (iqmp != NULL)
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289 | *iqmp = r->iqmp;
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290 | }
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291 |
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292 | void RSA_clear_flags(RSA *r, int flags)
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293 | {
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294 | r->flags &= ~flags;
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295 | }
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296 |
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297 | int RSA_test_flags(const RSA *r, int flags)
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298 | {
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299 | return r->flags & flags;
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300 | }
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301 |
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302 | void RSA_set_flags(RSA *r, int flags)
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303 | {
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304 | r->flags |= flags;
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305 | }
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306 |
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307 | ENGINE *RSA_get0_engine(const RSA *r)
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308 | {
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309 | return r->engine;
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310 | }
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