A local copy of OpenSSL from GitHub
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/*
* Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
*
* 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 "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) {
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, BIGNUM **p, BIGNUM **q, 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.
*
* It is an error to give the results from get0 on d
* as input parameters.
*/
if (p == dh->p || (dh->q != NULL && q == dh->q) || g == dh->g)
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, BIGNUM **pub_key, 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 pub_key in dh is NULL, the corresponding input
* parameters MUST be non-NULL. The priv_key field may
* be left NULL.
*
* It is an error to give the results from get0 on dh
* as input parameters.
*/
if (dh->pub_key == pub_key
|| (dh->priv_key != NULL && priv_key == dh->priv_key))
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;
}