[331] | 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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