-/* crypto/dh/dh_lib.c */
-/* Copyright (C) 1995-1997 Eric Young (eay@cryptsoft.com)
- * All rights reserved.
+/*
+ * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
*
- * This package is an SSL implementation written
- * by Eric Young (eay@cryptsoft.com).
- * The implementation was written so as to conform with Netscapes SSL.
- *
- * This library is free for commercial and non-commercial use as long as
- * the following conditions are aheared to. The following conditions
- * apply to all code found in this distribution, be it the RC4, RSA,
- * lhash, DES, etc., code; not just the SSL code. The SSL documentation
- * included with this distribution is covered by the same copyright terms
- * except that the holder is Tim Hudson (tjh@cryptsoft.com).
- *
- * Copyright remains Eric Young's, and as such any Copyright notices in
- * the code are not to be removed.
- * If this package is used in a product, Eric Young should be given attribution
- * as the author of the parts of the library used.
- * This can be in the form of a textual message at program startup or
- * in documentation (online or textual) provided with the package.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * "This product includes cryptographic software written by
- * Eric Young (eay@cryptsoft.com)"
- * The word 'cryptographic' can be left out if the rouines from the library
- * being used are not cryptographic related :-).
- * 4. If you include any Windows specific code (or a derivative thereof) from
- * the apps directory (application code) you must include an acknowledgement:
- * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
- *
- * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * The licence and distribution terms for any publically available version or
- * derivative of this code cannot be changed. i.e. this code cannot simply be
- * copied and put under another distribution licence
- * [including the GNU Public Licence.]
+ * Licensed under the OpenSSL license (the "License"). You may not use
+ * this file except in compliance with the License. You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
*/
#include <stdio.h>
-#include "cryptlib.h"
-#include "bn.h"
-#include "dh.h"
-
-char *DH_version="Diffie-Hellman part of SSLeay 0.8.1b 29-Jun-1998";
-
-DH *DH_new()
- {
- DH *ret;
-
- ret=(DH *)Malloc(sizeof(DH));
- if (ret == NULL)
- {
- DHerr(DH_F_DH_NEW,ERR_R_MALLOC_FAILURE);
- return(NULL);
- }
- ret->pad=0;
- ret->version=0;
- ret->p=NULL;
- ret->g=NULL;
- ret->length=0;
- ret->pub_key=NULL;
- ret->priv_key=NULL;
- return(ret);
- }
-
-void DH_free(r)
-DH *r;
- {
- if (r->p != NULL) BN_clear_free(r->p);
- if (r->g != NULL) BN_clear_free(r->g);
- if (r->pub_key != NULL) BN_clear_free(r->pub_key);
- if (r->priv_key != NULL) BN_clear_free(r->priv_key);
- Free(r);
- }
-
-int DH_size(dh)
-DH *dh;
- {
- return(BN_num_bytes(dh->p));
- }
+#include "internal/cryptlib.h"
+#include <openssl/bn.h>
+#include "dh_locl.h"
+#include <openssl/engine.h>
+
+static const DH_METHOD *default_DH_method = NULL;
+
+void DH_set_default_method(const DH_METHOD *meth)
+{
+ default_DH_method = meth;
+}
+
+const DH_METHOD *DH_get_default_method(void)
+{
+ if (!default_DH_method)
+ default_DH_method = DH_OpenSSL();
+ return default_DH_method;
+}
+
+int DH_set_method(DH *dh, const DH_METHOD *meth)
+{
+ /*
+ * NB: The caller is specifically setting a method, so it's not up to us
+ * to deal with which ENGINE it comes from.
+ */
+ const DH_METHOD *mtmp;
+ mtmp = dh->meth;
+ if (mtmp->finish)
+ mtmp->finish(dh);
+#ifndef OPENSSL_NO_ENGINE
+ ENGINE_finish(dh->engine);
+ dh->engine = NULL;
+#endif
+ dh->meth = meth;
+ if (meth->init)
+ meth->init(dh);
+ return 1;
+}
+
+DH *DH_new(void)
+{
+ return DH_new_method(NULL);
+}
+
+DH *DH_new_method(ENGINE *engine)
+{
+ DH *ret = OPENSSL_zalloc(sizeof(*ret));
+
+ if (ret == NULL) {
+ DHerr(DH_F_DH_NEW_METHOD, ERR_R_MALLOC_FAILURE);
+ return NULL;
+ }
+
+ ret->references = 1;
+ ret->lock = CRYPTO_THREAD_lock_new();
+ if (ret->lock == NULL) {
+ DHerr(DH_F_DH_NEW_METHOD, ERR_R_MALLOC_FAILURE);
+ OPENSSL_free(ret);
+ return NULL;
+ }
+
+ ret->meth = DH_get_default_method();
+#ifndef OPENSSL_NO_ENGINE
+ ret->flags = ret->meth->flags; /* early default init */
+ if (engine) {
+ if (!ENGINE_init(engine)) {
+ DHerr(DH_F_DH_NEW_METHOD, ERR_R_ENGINE_LIB);
+ goto err;
+ }
+ ret->engine = engine;
+ } else
+ ret->engine = ENGINE_get_default_DH();
+ if (ret->engine) {
+ ret->meth = ENGINE_get_DH(ret->engine);
+ if (ret->meth == NULL) {
+ DHerr(DH_F_DH_NEW_METHOD, ERR_R_ENGINE_LIB);
+ goto err;
+ }
+ }
+#endif
+
+ ret->flags = ret->meth->flags;
+
+ if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DH, ret, &ret->ex_data))
+ goto err;
+
+ if ((ret->meth->init != NULL) && !ret->meth->init(ret)) {
+ DHerr(DH_F_DH_NEW_METHOD, ERR_R_INIT_FAIL);
+err:
+ DH_free(ret);
+ ret = NULL;
+ }
+
+ return ret;
+}
+
+void DH_free(DH *r)
+{
+ int i;
+
+ if (r == NULL)
+ return;
+
+ CRYPTO_atomic_add(&r->references, -1, &i, r->lock);
+ REF_PRINT_COUNT("DH", r);
+ if (i > 0)
+ return;
+ REF_ASSERT_ISNT(i < 0);
+
+ if (r->meth->finish)
+ r->meth->finish(r);
+#ifndef OPENSSL_NO_ENGINE
+ ENGINE_finish(r->engine);
+#endif
+
+ CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DH, r, &r->ex_data);
+
+ CRYPTO_THREAD_lock_free(r->lock);
+
+ BN_clear_free(r->p);
+ BN_clear_free(r->g);
+ BN_clear_free(r->q);
+ BN_clear_free(r->j);
+ OPENSSL_free(r->seed);
+ BN_clear_free(r->counter);
+ BN_clear_free(r->pub_key);
+ BN_clear_free(r->priv_key);
+ OPENSSL_free(r);
+}
+
+int DH_up_ref(DH *r)
+{
+ int i;
+
+ if (CRYPTO_atomic_add(&r->references, 1, &i, r->lock) <= 0)
+ return 0;
+
+ REF_PRINT_COUNT("DH", r);
+ REF_ASSERT_ISNT(i < 2);
+ return ((i > 1) ? 1 : 0);
+}
+
+int DH_set_ex_data(DH *d, int idx, void *arg)
+{
+ return (CRYPTO_set_ex_data(&d->ex_data, idx, arg));
+}
+
+void *DH_get_ex_data(DH *d, int idx)
+{
+ return (CRYPTO_get_ex_data(&d->ex_data, idx));
+}
+
+int DH_bits(const DH *dh)
+{
+ return BN_num_bits(dh->p);
+}
+
+int DH_size(const DH *dh)
+{
+ return (BN_num_bytes(dh->p));
+}
+
+int DH_security_bits(const DH *dh)
+{
+ int N;
+ if (dh->q)
+ N = BN_num_bits(dh->q);
+ else if (dh->length)
+ N = dh->length;
+ else
+ N = -1;
+ return BN_security_bits(BN_num_bits(dh->p), N);
+}
+
+
+void DH_get0_pqg(const DH *dh,
+ const BIGNUM **p, const BIGNUM **q, const BIGNUM **g)
+{
+ if (p != NULL)
+ *p = dh->p;
+ if (q != NULL)
+ *q = dh->q;
+ if (g != NULL)
+ *g = dh->g;
+}
+
+int DH_set0_pqg(DH *dh, BIGNUM *p, BIGNUM *q, BIGNUM *g)
+{
+ /* If the fields p and g in d are NULL, the corresponding input
+ * parameters MUST be non-NULL. q may remain NULL.
+ */
+ if ((dh->p == NULL && p == NULL)
+ || (dh->g == NULL && g == NULL))
+ return 0;
+
+ if (p != NULL) {
+ BN_free(dh->p);
+ dh->p = p;
+ }
+ if (q != NULL) {
+ BN_free(dh->q);
+ dh->q = q;
+ }
+ if (g != NULL) {
+ BN_free(dh->g);
+ dh->g = g;
+ }
+
+ if (q != NULL) {
+ dh->length = BN_num_bits(q);
+ }
+
+ return 1;
+}
+
+long DH_get_length(const DH *dh)
+{
+ return dh->length;
+}
+
+int DH_set_length(DH *dh, long length)
+{
+ dh->length = length;
+ return 1;
+}
+
+void DH_get0_key(const DH *dh, const BIGNUM **pub_key, const BIGNUM **priv_key)
+{
+ if (pub_key != NULL)
+ *pub_key = dh->pub_key;
+ if (priv_key != NULL)
+ *priv_key = dh->priv_key;
+}
+
+int DH_set0_key(DH *dh, BIGNUM *pub_key, BIGNUM *priv_key)
+{
+ /* If the field pub_key in dh is NULL, the corresponding input
+ * parameters MUST be non-NULL. The priv_key field may
+ * be left NULL.
+ */
+ if (dh->pub_key == NULL && pub_key == NULL)
+ return 0;
+
+ if (pub_key != NULL) {
+ BN_free(dh->pub_key);
+ dh->pub_key = pub_key;
+ }
+ if (priv_key != NULL) {
+ BN_free(dh->priv_key);
+ dh->priv_key = priv_key;
+ }
+
+ return 1;
+}
+
+void DH_clear_flags(DH *dh, int flags)
+{
+ dh->flags &= ~flags;
+}
+
+int DH_test_flags(const DH *dh, int flags)
+{
+ return dh->flags & flags;
+}
+
+void DH_set_flags(DH *dh, int flags)
+{
+ dh->flags |= flags;
+}
+
+ENGINE *DH_get0_engine(DH *dh)
+{
+ return dh->engine;
+}
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