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 "internal/cryptlib.h"
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12 | #include <openssl/bn.h>
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13 | #include "dh_locl.h"
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14 | #include <openssl/engine.h>
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15 |
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16 | static const DH_METHOD *default_DH_method = NULL;
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17 |
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18 | void DH_set_default_method(const DH_METHOD *meth)
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19 | {
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20 | default_DH_method = meth;
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21 | }
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22 |
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23 | const DH_METHOD *DH_get_default_method(void)
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24 | {
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25 | if (!default_DH_method)
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26 | default_DH_method = DH_OpenSSL();
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27 | return default_DH_method;
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28 | }
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29 |
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30 | int DH_set_method(DH *dh, const DH_METHOD *meth)
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31 | {
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32 | /*
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33 | * NB: The caller is specifically setting a method, so it's not up to us
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34 | * to deal with which ENGINE it comes from.
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35 | */
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36 | const DH_METHOD *mtmp;
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37 | mtmp = dh->meth;
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38 | if (mtmp->finish)
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39 | mtmp->finish(dh);
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40 | #ifndef OPENSSL_NO_ENGINE
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41 | ENGINE_finish(dh->engine);
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42 | dh->engine = NULL;
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43 | #endif
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44 | dh->meth = meth;
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45 | if (meth->init)
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46 | meth->init(dh);
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47 | return 1;
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48 | }
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49 |
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50 | DH *DH_new(void)
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51 | {
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52 | return DH_new_method(NULL);
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53 | }
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54 |
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55 | DH *DH_new_method(ENGINE *engine)
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56 | {
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57 | DH *ret = OPENSSL_zalloc(sizeof(*ret));
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58 |
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59 | if (ret == NULL) {
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60 | DHerr(DH_F_DH_NEW_METHOD, ERR_R_MALLOC_FAILURE);
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61 | return NULL;
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62 | }
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63 |
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64 | ret->references = 1;
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65 | ret->lock = CRYPTO_THREAD_lock_new();
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66 | if (ret->lock == NULL) {
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67 | DHerr(DH_F_DH_NEW_METHOD, ERR_R_MALLOC_FAILURE);
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68 | OPENSSL_free(ret);
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69 | return NULL;
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70 | }
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71 |
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72 | ret->meth = DH_get_default_method();
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73 | #ifndef OPENSSL_NO_ENGINE
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74 | ret->flags = ret->meth->flags; /* early default init */
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75 | if (engine) {
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76 | if (!ENGINE_init(engine)) {
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77 | DHerr(DH_F_DH_NEW_METHOD, ERR_R_ENGINE_LIB);
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78 | goto err;
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79 | }
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80 | ret->engine = engine;
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81 | } else
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82 | ret->engine = ENGINE_get_default_DH();
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83 | if (ret->engine) {
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84 | ret->meth = ENGINE_get_DH(ret->engine);
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85 | if (ret->meth == NULL) {
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86 | DHerr(DH_F_DH_NEW_METHOD, ERR_R_ENGINE_LIB);
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87 | goto err;
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88 | }
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89 | }
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90 | #endif
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91 |
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92 | ret->flags = ret->meth->flags;
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93 |
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94 | if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DH, ret, &ret->ex_data))
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95 | goto err;
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96 |
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97 | if ((ret->meth->init != NULL) && !ret->meth->init(ret)) {
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98 | DHerr(DH_F_DH_NEW_METHOD, ERR_R_INIT_FAIL);
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99 | err:
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100 | DH_free(ret);
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101 | ret = NULL;
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102 | }
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103 |
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104 | return ret;
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105 | }
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106 |
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107 | void DH_free(DH *r)
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108 | {
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109 | int i;
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110 |
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111 | if (r == NULL)
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112 | return;
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113 |
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114 | CRYPTO_atomic_add(&r->references, -1, &i, r->lock);
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115 | REF_PRINT_COUNT("DH", r);
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116 | if (i > 0)
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117 | return;
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118 | REF_ASSERT_ISNT(i < 0);
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119 |
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120 | if (r->meth->finish)
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121 | r->meth->finish(r);
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122 | #ifndef OPENSSL_NO_ENGINE
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123 | ENGINE_finish(r->engine);
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124 | #endif
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125 |
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126 | CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DH, r, &r->ex_data);
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127 |
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128 | CRYPTO_THREAD_lock_free(r->lock);
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129 |
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130 | BN_clear_free(r->p);
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131 | BN_clear_free(r->g);
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132 | BN_clear_free(r->q);
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133 | BN_clear_free(r->j);
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134 | OPENSSL_free(r->seed);
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135 | BN_clear_free(r->counter);
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136 | BN_clear_free(r->pub_key);
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137 | BN_clear_free(r->priv_key);
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138 | OPENSSL_free(r);
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139 | }
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140 |
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141 | int DH_up_ref(DH *r)
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142 | {
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143 | int i;
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144 |
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145 | if (CRYPTO_atomic_add(&r->references, 1, &i, r->lock) <= 0)
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146 | return 0;
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147 |
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148 | REF_PRINT_COUNT("DH", r);
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149 | REF_ASSERT_ISNT(i < 2);
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150 | return ((i > 1) ? 1 : 0);
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151 | }
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152 |
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153 | int DH_set_ex_data(DH *d, int idx, void *arg)
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154 | {
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155 | return (CRYPTO_set_ex_data(&d->ex_data, idx, arg));
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156 | }
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157 |
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158 | void *DH_get_ex_data(DH *d, int idx)
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159 | {
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160 | return (CRYPTO_get_ex_data(&d->ex_data, idx));
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161 | }
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162 |
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163 | int DH_bits(const DH *dh)
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164 | {
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165 | return BN_num_bits(dh->p);
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166 | }
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167 |
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168 | int DH_size(const DH *dh)
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169 | {
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170 | return (BN_num_bytes(dh->p));
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171 | }
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172 |
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173 | int DH_security_bits(const DH *dh)
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174 | {
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175 | int N;
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176 | if (dh->q)
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177 | N = BN_num_bits(dh->q);
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178 | else if (dh->length)
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179 | N = dh->length;
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180 | else
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181 | N = -1;
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182 | return BN_security_bits(BN_num_bits(dh->p), N);
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183 | }
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184 |
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185 |
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186 | void DH_get0_pqg(const DH *dh,
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187 | const BIGNUM **p, const BIGNUM **q, const BIGNUM **g)
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188 | {
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189 | if (p != NULL)
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190 | *p = dh->p;
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191 | if (q != NULL)
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192 | *q = dh->q;
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193 | if (g != NULL)
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194 | *g = dh->g;
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195 | }
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196 |
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197 | int DH_set0_pqg(DH *dh, BIGNUM *p, BIGNUM *q, BIGNUM *g)
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198 | {
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199 | /* If the fields p and g in d are NULL, the corresponding input
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200 | * parameters MUST be non-NULL. q may remain NULL.
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201 | */
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202 | if ((dh->p == NULL && p == NULL)
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203 | || (dh->g == NULL && g == NULL))
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204 | return 0;
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205 |
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206 | if (p != NULL) {
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207 | BN_free(dh->p);
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208 | dh->p = p;
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209 | }
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210 | if (q != NULL) {
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211 | BN_free(dh->q);
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212 | dh->q = q;
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213 | }
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214 | if (g != NULL) {
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215 | BN_free(dh->g);
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216 | dh->g = g;
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217 | }
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218 |
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219 | if (q != NULL) {
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220 | dh->length = BN_num_bits(q);
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221 | }
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222 |
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223 | return 1;
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224 | }
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225 |
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226 | long DH_get_length(const DH *dh)
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227 | {
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228 | return dh->length;
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229 | }
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230 |
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231 | int DH_set_length(DH *dh, long length)
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232 | {
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233 | dh->length = length;
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234 | return 1;
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235 | }
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236 |
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237 | void DH_get0_key(const DH *dh, const BIGNUM **pub_key, const BIGNUM **priv_key)
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238 | {
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239 | if (pub_key != NULL)
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240 | *pub_key = dh->pub_key;
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241 | if (priv_key != NULL)
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242 | *priv_key = dh->priv_key;
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243 | }
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244 |
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245 | int DH_set0_key(DH *dh, BIGNUM *pub_key, BIGNUM *priv_key)
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246 | {
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247 | /* If the field pub_key in dh is NULL, the corresponding input
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248 | * parameters MUST be non-NULL. The priv_key field may
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249 | * be left NULL.
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250 | */
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251 | if (dh->pub_key == NULL && pub_key == NULL)
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252 | return 0;
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253 |
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254 | if (pub_key != NULL) {
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255 | BN_free(dh->pub_key);
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256 | dh->pub_key = pub_key;
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257 | }
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258 | if (priv_key != NULL) {
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259 | BN_free(dh->priv_key);
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260 | dh->priv_key = priv_key;
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261 | }
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262 |
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263 | return 1;
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264 | }
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265 |
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266 | void DH_clear_flags(DH *dh, int flags)
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267 | {
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268 | dh->flags &= ~flags;
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269 | }
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270 |
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271 | int DH_test_flags(const DH *dh, int flags)
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272 | {
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273 | return dh->flags & flags;
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274 | }
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275 |
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276 | void DH_set_flags(DH *dh, int flags)
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277 | {
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278 | dh->flags |= flags;
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279 | }
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280 |
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281 | ENGINE *DH_get0_engine(DH *dh)
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282 | {
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283 | return dh->engine;
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284 | }
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