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/*
* Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (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
*/
/*
* DSA low level APIs are deprecated for public use, but still ok for
* internal use.
*/
#include "internal/deprecated.h"
#include <openssl/bn.h>
#ifndef FIPS_MODULE
# include <openssl/engine.h>
#endif
#include "internal/cryptlib.h"
#include "internal/refcount.h"
#include "crypto/dsa.h"
#include "crypto/dh.h" /* required by DSA_dup_DH() */
#include "dsa_local.h"
static DSA *dsa_new_intern(ENGINE *engine, OSSL_LIB_CTX *libctx);
#ifndef FIPS_MODULE
int DSA_set_ex_data(DSA *d, int idx, void *arg)
{
return CRYPTO_set_ex_data(&d->ex_data, idx, arg);
}
void *DSA_get_ex_data(const DSA *d, int idx)
{
return CRYPTO_get_ex_data(&d->ex_data, idx);
}
# ifndef OPENSSL_NO_DH
DH *DSA_dup_DH(const DSA *r)
{
/*
* DSA has p, q, g, optional pub_key, optional priv_key.
* DH has p, optional length, g, optional pub_key,
* optional priv_key, optional q.
*/
DH *ret = NULL;
BIGNUM *pub_key = NULL, *priv_key = NULL;
if (r == NULL)
goto err;
ret = DH_new();
if (ret == NULL)
goto err;
if (!ossl_ffc_params_copy(ossl_dh_get0_params(ret), &r->params))
goto err;
if (r->pub_key != NULL) {
pub_key = BN_dup(r->pub_key);
if (pub_key == NULL)
goto err;
if (r->priv_key != NULL) {
priv_key = BN_dup(r->priv_key);
if (priv_key == NULL)
goto err;
}
if (!DH_set0_key(ret, pub_key, priv_key))
goto err;
} else if (r->priv_key != NULL) {
/* Shouldn't happen */
goto err;
}
return ret;
err:
BN_free(pub_key);
BN_free(priv_key);
DH_free(ret);
return NULL;
}
# endif /* OPENSSL_NO_DH */
void DSA_clear_flags(DSA *d, int flags)
{
d->flags &= ~flags;
}
int DSA_test_flags(const DSA *d, int flags)
{
return d->flags & flags;
}
void DSA_set_flags(DSA *d, int flags)
{
d->flags |= flags;
}
ENGINE *DSA_get0_engine(DSA *d)
{
return d->engine;
}
int DSA_set_method(DSA *dsa, const DSA_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 DSA_METHOD *mtmp;
mtmp = dsa->meth;
if (mtmp->finish)
mtmp->finish(dsa);
#ifndef OPENSSL_NO_ENGINE
ENGINE_finish(dsa->engine);
dsa->engine = NULL;
#endif
dsa->meth = meth;
if (meth->init)
meth->init(dsa);
return 1;
}
#endif /* FIPS_MODULE */
const DSA_METHOD *DSA_get_method(DSA *d)
{
return d->meth;
}
static DSA *dsa_new_intern(ENGINE *engine, OSSL_LIB_CTX *libctx)
{
DSA *ret = OPENSSL_zalloc(sizeof(*ret));
if (ret == NULL) {
ERR_raise(ERR_LIB_DSA, ERR_R_MALLOC_FAILURE);
return NULL;
}
ret->references = 1;
ret->lock = CRYPTO_THREAD_lock_new();
if (ret->lock == NULL) {
ERR_raise(ERR_LIB_DSA, ERR_R_MALLOC_FAILURE);
OPENSSL_free(ret);
return NULL;
}
ret->libctx = libctx;
ret->meth = DSA_get_default_method();
#if !defined(FIPS_MODULE) && !defined(OPENSSL_NO_ENGINE)
ret->flags = ret->meth->flags & ~DSA_FLAG_NON_FIPS_ALLOW; /* early default init */
if (engine) {
if (!ENGINE_init(engine)) {
ERR_raise(ERR_LIB_DSA, ERR_R_ENGINE_LIB);
goto err;
}
ret->engine = engine;
} else
ret->engine = ENGINE_get_default_DSA();
if (ret->engine) {
ret->meth = ENGINE_get_DSA(ret->engine);
if (ret->meth == NULL) {
ERR_raise(ERR_LIB_DSA, ERR_R_ENGINE_LIB);
goto err;
}
}
#endif
ret->flags = ret->meth->flags & ~DSA_FLAG_NON_FIPS_ALLOW;
#ifndef FIPS_MODULE
if (!ossl_crypto_new_ex_data_ex(libctx, CRYPTO_EX_INDEX_DSA, ret,
&ret->ex_data))
goto err;
#endif
if ((ret->meth->init != NULL) && !ret->meth->init(ret)) {
ERR_raise(ERR_LIB_DSA, ERR_R_INIT_FAIL);
goto err;
}
return ret;
err:
DSA_free(ret);
return NULL;
}
DSA *DSA_new_method(ENGINE *engine)
{
return dsa_new_intern(engine, NULL);
}
DSA *ossl_dsa_new(OSSL_LIB_CTX *libctx)
{
return dsa_new_intern(NULL, libctx);
}
#ifndef FIPS_MODULE
DSA *DSA_new(void)
{
return dsa_new_intern(NULL, NULL);
}
#endif
void DSA_free(DSA *r)
{
int i;
if (r == NULL)
return;
CRYPTO_DOWN_REF(&r->references, &i, r->lock);
REF_PRINT_COUNT("DSA", r);
if (i > 0)
return;
REF_ASSERT_ISNT(i < 0);
if (r->meth != NULL && r->meth->finish != NULL)
r->meth->finish(r);
#if !defined(FIPS_MODULE) && !defined(OPENSSL_NO_ENGINE)
ENGINE_finish(r->engine);
#endif
#ifndef FIPS_MODULE
CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, r, &r->ex_data);
#endif
CRYPTO_THREAD_lock_free(r->lock);
ossl_ffc_params_cleanup(&r->params);
BN_clear_free(r->pub_key);
BN_clear_free(r->priv_key);
OPENSSL_free(r);
}
int DSA_up_ref(DSA *r)
{
int i;
if (CRYPTO_UP_REF(&r->references, &i, r->lock) <= 0)
return 0;
REF_PRINT_COUNT("DSA", r);
REF_ASSERT_ISNT(i < 2);
return ((i > 1) ? 1 : 0);
}
void ossl_dsa_set0_libctx(DSA *d, OSSL_LIB_CTX *libctx)
{
d->libctx = libctx;
}
void DSA_get0_pqg(const DSA *d,
const BIGNUM **p, const BIGNUM **q, const BIGNUM **g)
{
ossl_ffc_params_get0_pqg(&d->params, p, q, g);
}
int DSA_set0_pqg(DSA *d, BIGNUM *p, BIGNUM *q, BIGNUM *g)
{
/* If the fields p, q and g in d are NULL, the corresponding input
* parameters MUST be non-NULL.
*/
if ((d->params.p == NULL && p == NULL)
|| (d->params.q == NULL && q == NULL)
|| (d->params.g == NULL && g == NULL))
return 0;
ossl_ffc_params_set0_pqg(&d->params, p, q, g);
d->dirty_cnt++;
return 1;
}
const BIGNUM *DSA_get0_p(const DSA *d)
{
return d->params.p;
}
const BIGNUM *DSA_get0_q(const DSA *d)
{
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