[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 | #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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