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 | /* Original version from Steven Schoch <schoch@sheba.arc.nasa.gov> */
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11 |
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12 | #include <stdio.h>
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13 | #include "internal/cryptlib.h"
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14 | #include <openssl/bn.h>
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15 | #include "dsa_locl.h"
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16 | #include <openssl/asn1.h>
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17 | #include <openssl/engine.h>
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18 | #include <openssl/dh.h>
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19 |
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20 | static const DSA_METHOD *default_DSA_method = NULL;
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21 |
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22 | void DSA_set_default_method(const DSA_METHOD *meth)
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23 | {
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24 | default_DSA_method = meth;
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25 | }
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26 |
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27 | const DSA_METHOD *DSA_get_default_method(void)
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28 | {
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29 | if (!default_DSA_method)
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30 | default_DSA_method = DSA_OpenSSL();
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31 | return default_DSA_method;
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32 | }
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33 |
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34 | DSA *DSA_new(void)
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35 | {
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36 | return DSA_new_method(NULL);
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37 | }
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38 |
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39 | int DSA_set_method(DSA *dsa, const DSA_METHOD *meth)
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40 | {
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41 | /*
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42 | * NB: The caller is specifically setting a method, so it's not up to us
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43 | * to deal with which ENGINE it comes from.
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44 | */
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45 | const DSA_METHOD *mtmp;
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46 | mtmp = dsa->meth;
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47 | if (mtmp->finish)
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48 | mtmp->finish(dsa);
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49 | #ifndef OPENSSL_NO_ENGINE
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50 | ENGINE_finish(dsa->engine);
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51 | dsa->engine = NULL;
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52 | #endif
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53 | dsa->meth = meth;
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54 | if (meth->init)
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55 | meth->init(dsa);
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56 | return 1;
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57 | }
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58 |
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59 | const DSA_METHOD *DSA_get_method(DSA *d)
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60 | {
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61 | return d->meth;
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62 | }
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63 |
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64 | DSA *DSA_new_method(ENGINE *engine)
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65 | {
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66 | DSA *ret = OPENSSL_zalloc(sizeof(*ret));
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67 |
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68 | if (ret == NULL) {
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69 | DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_MALLOC_FAILURE);
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70 | return NULL;
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71 | }
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72 |
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73 | ret->references = 1;
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74 | ret->lock = CRYPTO_THREAD_lock_new();
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75 | if (ret->lock == NULL) {
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76 | DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_MALLOC_FAILURE);
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77 | OPENSSL_free(ret);
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78 | return NULL;
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79 | }
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80 |
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81 | ret->meth = DSA_get_default_method();
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82 | #ifndef OPENSSL_NO_ENGINE
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83 | ret->flags = ret->meth->flags & ~DSA_FLAG_NON_FIPS_ALLOW; /* early default init */
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84 | if (engine) {
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85 | if (!ENGINE_init(engine)) {
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86 | DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_ENGINE_LIB);
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87 | goto err;
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88 | }
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89 | ret->engine = engine;
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90 | } else
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91 | ret->engine = ENGINE_get_default_DSA();
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92 | if (ret->engine) {
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93 | ret->meth = ENGINE_get_DSA(ret->engine);
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94 | if (ret->meth == NULL) {
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95 | DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_ENGINE_LIB);
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96 | goto err;
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97 | }
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98 | }
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99 | #endif
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100 |
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101 | ret->flags = ret->meth->flags & ~DSA_FLAG_NON_FIPS_ALLOW;
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102 |
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103 | if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data))
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104 | goto err;
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105 |
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106 | if ((ret->meth->init != NULL) && !ret->meth->init(ret)) {
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107 | DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_INIT_FAIL);
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108 | err:
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109 | DSA_free(ret);
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110 | ret = NULL;
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111 | }
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112 |
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113 | return ret;
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114 | }
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115 |
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116 | void DSA_free(DSA *r)
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117 | {
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118 | int i;
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119 |
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120 | if (r == NULL)
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121 | return;
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122 |
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123 | CRYPTO_atomic_add(&r->references, -1, &i, r->lock);
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124 | REF_PRINT_COUNT("DSA", r);
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125 | if (i > 0)
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126 | return;
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127 | REF_ASSERT_ISNT(i < 0);
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128 |
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129 | if (r->meth->finish)
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130 | r->meth->finish(r);
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131 | #ifndef OPENSSL_NO_ENGINE
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132 | ENGINE_finish(r->engine);
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133 | #endif
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134 |
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135 | CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, r, &r->ex_data);
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136 |
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137 | CRYPTO_THREAD_lock_free(r->lock);
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138 |
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139 | BN_clear_free(r->p);
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140 | BN_clear_free(r->q);
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141 | BN_clear_free(r->g);
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142 | BN_clear_free(r->pub_key);
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143 | BN_clear_free(r->priv_key);
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144 | OPENSSL_free(r);
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145 | }
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146 |
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147 | int DSA_up_ref(DSA *r)
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148 | {
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149 | int i;
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150 |
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151 | if (CRYPTO_atomic_add(&r->references, 1, &i, r->lock) <= 0)
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152 | return 0;
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153 |
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154 | REF_PRINT_COUNT("DSA", r);
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155 | REF_ASSERT_ISNT(i < 2);
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156 | return ((i > 1) ? 1 : 0);
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157 | }
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158 |
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159 | int DSA_size(const DSA *r)
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160 | {
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161 | int ret, i;
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162 | ASN1_INTEGER bs;
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163 | unsigned char buf[4]; /* 4 bytes looks really small. However,
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164 | * i2d_ASN1_INTEGER() will not look beyond
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165 | * the first byte, as long as the second
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166 | * parameter is NULL. */
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167 |
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168 | i = BN_num_bits(r->q);
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169 | bs.length = (i + 7) / 8;
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170 | bs.data = buf;
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171 | bs.type = V_ASN1_INTEGER;
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172 | /* If the top bit is set the asn1 encoding is 1 larger. */
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173 | buf[0] = 0xff;
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174 |
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175 | i = i2d_ASN1_INTEGER(&bs, NULL);
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176 | i += i; /* r and s */
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177 | ret = ASN1_object_size(1, i, V_ASN1_SEQUENCE);
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178 | return (ret);
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179 | }
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180 |
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181 | int DSA_set_ex_data(DSA *d, int idx, void *arg)
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182 | {
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183 | return (CRYPTO_set_ex_data(&d->ex_data, idx, arg));
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184 | }
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185 |
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186 | void *DSA_get_ex_data(DSA *d, int idx)
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187 | {
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188 | return (CRYPTO_get_ex_data(&d->ex_data, idx));
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189 | }
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190 |
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191 | int DSA_security_bits(const DSA *d)
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192 | {
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193 | if (d->p && d->q)
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194 | return BN_security_bits(BN_num_bits(d->p), BN_num_bits(d->q));
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195 | return -1;
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196 | }
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197 |
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198 | #ifndef OPENSSL_NO_DH
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199 | DH *DSA_dup_DH(const DSA *r)
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200 | {
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201 | /*
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202 | * DSA has p, q, g, optional pub_key, optional priv_key. DH has p,
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203 | * optional length, g, optional pub_key, optional priv_key, optional q.
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204 | */
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205 |
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206 | DH *ret = NULL;
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207 | BIGNUM *p = NULL, *q = NULL, *g = NULL, *pub_key = NULL, *priv_key = NULL;
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208 |
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209 | if (r == NULL)
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210 | goto err;
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211 | ret = DH_new();
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212 | if (ret == NULL)
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213 | goto err;
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214 | if (r->p != NULL || r->g != NULL || r->q != NULL) {
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215 | if (r->p == NULL || r->g == NULL || r->q == NULL) {
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216 | /* Shouldn't happen */
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217 | goto err;
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218 | }
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219 | p = BN_dup(r->p);
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220 | g = BN_dup(r->g);
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221 | q = BN_dup(r->q);
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222 | if (p == NULL || g == NULL || q == NULL || !DH_set0_pqg(ret, p, q, g))
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223 | goto err;
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224 | p = g = q = NULL;
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225 | }
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226 |
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227 | if (r->pub_key != NULL) {
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228 | pub_key = BN_dup(r->pub_key);
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229 | if (pub_key == NULL)
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230 | goto err;
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231 | if (r->priv_key != NULL) {
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232 | priv_key = BN_dup(r->priv_key);
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233 | if (priv_key == NULL)
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234 | goto err;
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235 | }
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236 | if (!DH_set0_key(ret, pub_key, priv_key))
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237 | goto err;
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238 | } else if (r->priv_key != NULL) {
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239 | /* Shouldn't happen */
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240 | goto err;
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241 | }
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242 |
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243 | return ret;
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244 |
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245 | err:
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246 | BN_free(p);
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247 | BN_free(g);
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248 | BN_free(q);
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249 | BN_free(pub_key);
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250 | BN_free(priv_key);
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251 | DH_free(ret);
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252 | return NULL;
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253 | }
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254 | #endif
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255 |
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256 | void DSA_get0_pqg(const DSA *d,
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257 | const BIGNUM **p, const BIGNUM **q, const BIGNUM **g)
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258 | {
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259 | if (p != NULL)
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260 | *p = d->p;
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261 | if (q != NULL)
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262 | *q = d->q;
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263 | if (g != NULL)
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264 | *g = d->g;
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265 | }
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266 |
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267 | int DSA_set0_pqg(DSA *d, BIGNUM *p, BIGNUM *q, BIGNUM *g)
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268 | {
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269 | /* If the fields p, q and g in d are NULL, the corresponding input
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270 | * parameters MUST be non-NULL.
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271 | */
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272 | if ((d->p == NULL && p == NULL)
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273 | || (d->q == NULL && q == NULL)
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274 | || (d->g == NULL && g == NULL))
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275 | return 0;
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276 |
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277 | if (p != NULL) {
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278 | BN_free(d->p);
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279 | d->p = p;
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280 | }
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281 | if (q != NULL) {
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282 | BN_free(d->q);
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283 | d->q = q;
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284 | }
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285 | if (g != NULL) {
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286 | BN_free(d->g);
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287 | d->g = g;
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288 | }
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289 |
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290 | return 1;
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291 | }
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292 |
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293 | void DSA_get0_key(const DSA *d,
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294 | const BIGNUM **pub_key, const BIGNUM **priv_key)
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295 | {
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296 | if (pub_key != NULL)
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297 | *pub_key = d->pub_key;
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298 | if (priv_key != NULL)
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299 | *priv_key = d->priv_key;
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300 | }
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301 |
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302 | int DSA_set0_key(DSA *d, BIGNUM *pub_key, BIGNUM *priv_key)
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303 | {
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304 | /* If the field pub_key in d is NULL, the corresponding input
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305 | * parameters MUST be non-NULL. The priv_key field may
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306 | * be left NULL.
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307 | */
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308 | if (d->pub_key == NULL && pub_key == NULL)
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309 | return 0;
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310 |
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311 | if (pub_key != NULL) {
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312 | BN_free(d->pub_key);
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313 | d->pub_key = pub_key;
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314 | }
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315 | if (priv_key != NULL) {
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316 | BN_free(d->priv_key);
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317 | d->priv_key = priv_key;
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318 | }
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319 |
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320 | return 1;
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321 | }
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322 |
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323 | void DSA_clear_flags(DSA *d, int flags)
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324 | {
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325 | d->flags &= ~flags;
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326 | }
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327 |
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328 | int DSA_test_flags(const DSA *d, int flags)
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329 | {
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330 | return d->flags & flags;
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331 | }
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332 |
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333 | void DSA_set_flags(DSA *d, int flags)
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334 | {
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335 | d->flags |= flags;
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336 | }
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337 |
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338 | ENGINE *DSA_get0_engine(DSA *d)
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339 | {
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340 | return d->engine;
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341 | }
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342 |
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343 | int DSA_bits(const DSA *dsa)
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344 | {
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345 | return BN_num_bits(dsa->p);
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346 | }
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