crypto/dsa/dsa_lib.c - third_party/openssl - Git at Google

 /*
  * Copyright 1995-2020 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 <stdio.h>
 #include "internal/cryptlib.h"
 #include "internal/refcount.h"
 #include <openssl/bn.h>
 #include <openssl/asn1.h>
 #include <openssl/engine.h>
 #include <openssl/core_names.h>
 #include "dsa_local.h"
 #include "crypto/evp.h"
 #include "crypto/dsa.h"
 #include "crypto/dh.h" /* required by DSA_dup_DH() */

 static DSA *dsa_new_intern(ENGINE *engine, OPENSSL_CTX *libctx);

 #ifndef FIPS_MODE

 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 (!ffc_params_copy(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_MODE */


 const DSA_METHOD *DSA_get_method(DSA *d)
 {
     return d->meth;
 }

 static DSA *dsa_new_intern(ENGINE *engine, OPENSSL_CTX *libctx)
 {
     DSA *ret = OPENSSL_zalloc(sizeof(*ret));

     if (ret == NULL) {
         DSAerr(0, ERR_R_MALLOC_FAILURE);
         return NULL;
     }

     ret->references = 1;
     ret->lock = CRYPTO_THREAD_lock_new();
     if (ret->lock == NULL) {
         DSAerr(0, ERR_R_MALLOC_FAILURE);
         OPENSSL_free(ret);
         return NULL;
     }

     ret->libctx = libctx;
     ret->meth = DSA_get_default_method();
 #if !defined(FIPS_MODE) && !defined(OPENSSL_NO_ENGINE)
     ret->flags = ret->meth->flags & ~DSA_FLAG_NON_FIPS_ALLOW; /* early default init */
     if (engine) {
         if (!ENGINE_init(engine)) {
             DSAerr(0, 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) {
             DSAerr(0, ERR_R_ENGINE_LIB);
             goto err;
         }
     }
 #endif

     ret->flags = ret->meth->flags & ~DSA_FLAG_NON_FIPS_ALLOW;

 #ifndef FIPS_MODE
     if (!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)) {
         DSAerr(0, 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 *dsa_new_with_ctx(OPENSSL_CTX *libctx)
 {
     return dsa_new_intern(NULL, libctx);
 }

 #ifndef FIPS_MODE
 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_MODE) && !defined(OPENSSL_NO_ENGINE)
     ENGINE_finish(r->engine);
 #endif

 #ifndef FIPS_MODE
     CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, r, &r->ex_data);
 #endif

     CRYPTO_THREAD_lock_free(r->lock);

     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 DSA_get0_pqg(const DSA *d,
                   const BIGNUM **p, const BIGNUM **q, const BIGNUM **g)
 {
     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;

     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)
 {
     return d->params.q;
 }

 const BIGNUM *DSA_get0_g(const DSA *d)
 {
     return d->params.g;
 }

 const BIGNUM *DSA_get0_pub_key(const DSA *d)
 {
     return d->pub_key;
 }

 const BIGNUM *DSA_get0_priv_key(const DSA *d)
 {
     return d->priv_key;
 }

 void DSA_get0_key(const DSA *d,
                   const BIGNUM **pub_key, const BIGNUM **priv_key)
 {
     if (pub_key != NULL)
         *pub_key = d->pub_key;
     if (priv_key != NULL)
         *priv_key = d->priv_key;
 }

 int DSA_set0_key(DSA *d, BIGNUM *pub_key, BIGNUM *priv_key)
 {
     /* If the field pub_key in d is NULL, the corresponding input
      * parameters MUST be non-NULL.  The priv_key field may
      * be left NULL.
      */
     if (d->pub_key == NULL && pub_key == NULL)
         return 0;

     if (pub_key != NULL) {
         BN_free(d->pub_key);
         d->pub_key = pub_key;
     }
     if (priv_key != NULL) {
         BN_free(d->priv_key);
         d->priv_key = priv_key;
     }
     d->dirty_cnt++;

     return 1;
 }

 int DSA_security_bits(const DSA *d)
 {
     if (d->params.p != NULL && d->params.q != NULL)
         return BN_security_bits(BN_num_bits(d->params.p),
                                 BN_num_bits(d->params.q));
     return -1;
 }

 int DSA_bits(const DSA *dsa)
 {
     return BN_num_bits(dsa->params.p);
 }

 FFC_PARAMS *dsa_get0_params(DSA *dsa)
 {
     return &dsa->params;
 }

 int dsa_ffc_params_fromdata(DSA *dsa, const OSSL_PARAM params[])
 {
     int ret;
     FFC_PARAMS *ffc;

     if (dsa == NULL)
         return 0;
     ffc = dsa_get0_params(dsa);
     if (ffc == NULL)
         return 0;

     ret = ffc_params_fromdata(ffc, params);
     if (ret)
         dsa->dirty_cnt++;
     return ret;
 }

 static int dsa_paramgen_check(EVP_PKEY_CTX *ctx)
 {
     if (ctx == NULL || !EVP_PKEY_CTX_IS_GEN_OP(ctx)) {
         ERR_raise(ERR_LIB_EVP, EVP_R_COMMAND_NOT_SUPPORTED);
         /* Uses the same return values as EVP_PKEY_CTX_ctrl */
         return -2;
     }
     /* If key type not DSA return error */
     if (ctx->pmeth != NULL && ctx->pmeth->pkey_id != EVP_PKEY_DSA)
         return -1;
     return 1;
 }

 int EVP_PKEY_CTX_set_dsa_paramgen_type(EVP_PKEY_CTX *ctx, const char *name)
 {
     int ret;
     OSSL_PARAM params[2], *p = params;

     if ((ret = dsa_paramgen_check(ctx)) <= 0)
         return ret;

     *p++ = OSSL_PARAM_construct_utf8_string(OSSL_PKEY_PARAM_FFC_TYPE,
                                             (char *)name, 0);
     *p++ = OSSL_PARAM_construct_end();

     return EVP_PKEY_CTX_set_params(ctx, params);
 }

 int EVP_PKEY_CTX_set_dsa_paramgen_gindex(EVP_PKEY_CTX *ctx, int gindex)
 {
     int ret;
     OSSL_PARAM params[2], *p = params;

     if ((ret = dsa_paramgen_check(ctx)) <= 0)
         return ret;

     *p++ = OSSL_PARAM_construct_int(OSSL_PKEY_PARAM_FFC_GINDEX, &gindex);
     *p++ = OSSL_PARAM_construct_end();

     return EVP_PKEY_CTX_set_params(ctx, params);
 }

 int EVP_PKEY_CTX_set_dsa_paramgen_seed(EVP_PKEY_CTX *ctx,
                                        const unsigned char *seed,
                                        size_t seedlen)
 {
     int ret;
     OSSL_PARAM params[2], *p = params;

     if ((ret = dsa_paramgen_check(ctx)) <= 0)
         return ret;

     *p++ = OSSL_PARAM_construct_octet_string(OSSL_PKEY_PARAM_FFC_SEED,
                                              (void *)seed, seedlen);
     *p++ = OSSL_PARAM_construct_end();

     return EVP_PKEY_CTX_set_params(ctx, params);
 }

 int EVP_PKEY_CTX_set_dsa_paramgen_bits(EVP_PKEY_CTX *ctx, int nbits)
 {
     int ret;
     OSSL_PARAM params[2], *p = params;
     size_t bits = nbits;

     if ((ret = dsa_paramgen_check(ctx)) <= 0)
         return ret;

 #if !defined(FIPS_MODE)
     /* TODO(3.0): Remove this eventually when no more legacy */
     if (ctx->op.keymgmt.genctx == NULL)
         return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DSA,  EVP_PKEY_OP_PARAMGEN,
                                  EVP_PKEY_CTRL_DSA_PARAMGEN_BITS, nbits, NULL);
 #endif

     *p++ = OSSL_PARAM_construct_size_t(OSSL_PKEY_PARAM_FFC_PBITS, &bits);
     *p++ = OSSL_PARAM_construct_end();

     return EVP_PKEY_CTX_set_params(ctx, params);
 }

 int EVP_PKEY_CTX_set_dsa_paramgen_q_bits(EVP_PKEY_CTX *ctx, int qbits)
 {
     int ret;
     OSSL_PARAM params[2], *p = params;
     size_t bits2 = qbits;

     if ((ret = dsa_paramgen_check(ctx)) <= 0)
         return ret;

 #if !defined(FIPS_MODE)
     /* TODO(3.0): Remove this eventually when no more legacy */
     if (ctx->op.keymgmt.genctx == NULL)
         return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DSA,  EVP_PKEY_OP_PARAMGEN,
                                  EVP_PKEY_CTRL_DSA_PARAMGEN_Q_BITS, qbits, NULL);
 #endif

     *p++ = OSSL_PARAM_construct_size_t(OSSL_PKEY_PARAM_FFC_QBITS, &bits2);
     *p++ = OSSL_PARAM_construct_end();

     return EVP_PKEY_CTX_set_params(ctx, params);
 }

 int EVP_PKEY_CTX_set_dsa_paramgen_md_props(EVP_PKEY_CTX *ctx,
                                            const char *md_name,
                                            const char *md_properties)
 {
     int ret;
     OSSL_PARAM params[3], *p = params;

     if ((ret = dsa_paramgen_check(ctx)) <= 0)
         return ret;

 #if !defined(FIPS_MODE)
     /* TODO(3.0): Remove this eventually when no more legacy */
     if (ctx->op.keymgmt.genctx == NULL) {
         const EVP_MD *md = EVP_get_digestbyname(md_name);

          EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DSA, EVP_PKEY_OP_PARAMGEN,
                            EVP_PKEY_CTRL_DSA_PARAMGEN_MD, 0, (void *)(md));
     }
 #endif

     *p++ = OSSL_PARAM_construct_utf8_string(OSSL_PKEY_PARAM_FFC_DIGEST,
                                             (char *)md_name, 0);
     if (md_properties != NULL)
         *p++ = OSSL_PARAM_construct_utf8_string(OSSL_PKEY_PARAM_FFC_DIGEST_PROPS,
                                                 (char *)md_properties, 0);
     *p++ = OSSL_PARAM_construct_end();

     return EVP_PKEY_CTX_set_params(ctx, params);
 }

 #if !defined(FIPS_MODE)
 int EVP_PKEY_CTX_set_dsa_paramgen_md(EVP_PKEY_CTX *ctx, const EVP_MD *md)
 {
     const char *md_name = (md == NULL) ? "" : EVP_MD_name(md);

     return EVP_PKEY_CTX_set_dsa_paramgen_md_props(ctx, md_name, NULL);
 }
 #endif
	/*
	* Copyright 1995-2020 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 <stdio.h>
	#include "internal/cryptlib.h"
	#include "internal/refcount.h"
	#include <openssl/bn.h>
	#include <openssl/asn1.h>
	#include <openssl/engine.h>
	#include <openssl/core_names.h>
	#include "dsa_local.h"
	#include "crypto/evp.h"
	#include "crypto/dsa.h"
	#include "crypto/dh.h" /* required by DSA_dup_DH() */

	static DSA dsa_new_intern(ENGINE engine, OPENSSL_CTX *libctx);

	#ifndef FIPS_MODE

	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 (!ffc_params_copy(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_MODE */


	const DSA_METHOD DSA_get_method(DSA d)
	{
	return d->meth;
	}

	static DSA dsa_new_intern(ENGINE engine, OPENSSL_CTX *libctx)
	{
	DSA ret = OPENSSL_zalloc(sizeof(ret));

	if (ret == NULL) {
	DSAerr(0, ERR_R_MALLOC_FAILURE);
	return NULL;
	}

	ret->references = 1;
	ret->lock = CRYPTO_THREAD_lock_new();
	if (ret->lock == NULL) {
	DSAerr(0, ERR_R_MALLOC_FAILURE);
	OPENSSL_free(ret);
	return NULL;
	}

	ret->libctx = libctx;
	ret->meth = DSA_get_default_method();
	#if !defined(FIPS_MODE) && !defined(OPENSSL_NO_ENGINE)
	ret->flags = ret->meth->flags & ~DSA_FLAG_NON_FIPS_ALLOW; /* early default init */
	if (engine) {
	if (!ENGINE_init(engine)) {
	DSAerr(0, 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) {
	DSAerr(0, ERR_R_ENGINE_LIB);
	goto err;
	}
	}
	#endif

	ret->flags = ret->meth->flags & ~DSA_FLAG_NON_FIPS_ALLOW;

	#ifndef FIPS_MODE
	if (!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)) {
	DSAerr(0, 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 dsa_new_with_ctx(OPENSSL_CTX libctx)
	{
	return dsa_new_intern(NULL, libctx);
	}

	#ifndef FIPS_MODE
	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_MODE) && !defined(OPENSSL_NO_ENGINE)
	ENGINE_finish(r->engine);
	#endif

	#ifndef FIPS_MODE
	CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, r, &r->ex_data);
	#endif

	CRYPTO_THREAD_lock_free(r->lock);

	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 DSA_get0_pqg(const DSA *d,
	const BIGNUM p, const BIGNUM q, const BIGNUM **g)
	{
	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;

	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)
	{
	return d->params.q;
	}

	const BIGNUM DSA_get0_g(const DSA d)
	{
	return d->params.g;
	}

	const BIGNUM DSA_get0_pub_key(const DSA d)
	{
	return d->pub_key;
	}

	const BIGNUM DSA_get0_priv_key(const DSA d)
	{
	return d->priv_key;
	}

	void DSA_get0_key(const DSA *d,
	const BIGNUM pub_key, const BIGNUM priv_key)
	{
	if (pub_key != NULL)
	*pub_key = d->pub_key;
	if (priv_key != NULL)
	*priv_key = d->priv_key;
	}

	int DSA_set0_key(DSA d, BIGNUM pub_key, BIGNUM *priv_key)
	{
	/* If the field pub_key in d is NULL, the corresponding input
	* parameters MUST be non-NULL. The priv_key field may
	* be left NULL.
	*/
	if (d->pub_key == NULL && pub_key == NULL)
	return 0;

	if (pub_key != NULL) {
	BN_free(d->pub_key);
	d->pub_key = pub_key;
	}
	if (priv_key != NULL) {
	BN_free(d->priv_key);
	d->priv_key = priv_key;
	}
	d->dirty_cnt++;

	return 1;
	}

	int DSA_security_bits(const DSA *d)
	{
	if (d->params.p != NULL && d->params.q != NULL)
	return BN_security_bits(BN_num_bits(d->params.p),
	BN_num_bits(d->params.q));
	return -1;
	}

	int DSA_bits(const DSA *dsa)
	{
	return BN_num_bits(dsa->params.p);
	}

	FFC_PARAMS dsa_get0_params(DSA dsa)
	{
	return &dsa->params;
	}

	int dsa_ffc_params_fromdata(DSA *dsa, const OSSL_PARAM params[])
	{
	int ret;
	FFC_PARAMS *ffc;

	if (dsa == NULL)
	return 0;
	ffc = dsa_get0_params(dsa);
	if (ffc == NULL)
	return 0;

	ret = ffc_params_fromdata(ffc, params);
	if (ret)
	dsa->dirty_cnt++;
	return ret;
	}

	static int dsa_paramgen_check(EVP_PKEY_CTX *ctx)
	{
	if (ctx == NULL \|\| !EVP_PKEY_CTX_IS_GEN_OP(ctx)) {
	ERR_raise(ERR_LIB_EVP, EVP_R_COMMAND_NOT_SUPPORTED);
	/* Uses the same return values as EVP_PKEY_CTX_ctrl */
	return -2;
	}
	/* If key type not DSA return error */
	if (ctx->pmeth != NULL && ctx->pmeth->pkey_id != EVP_PKEY_DSA)
	return -1;
	return 1;
	}

	int EVP_PKEY_CTX_set_dsa_paramgen_type(EVP_PKEY_CTX ctx, const char name)
	{
	int ret;
	OSSL_PARAM params[2], *p = params;

	if ((ret = dsa_paramgen_check(ctx)) <= 0)
	return ret;

	*p++ = OSSL_PARAM_construct_utf8_string(OSSL_PKEY_PARAM_FFC_TYPE,
	(char *)name, 0);
	*p++ = OSSL_PARAM_construct_end();

	return EVP_PKEY_CTX_set_params(ctx, params);
	}

	int EVP_PKEY_CTX_set_dsa_paramgen_gindex(EVP_PKEY_CTX *ctx, int gindex)
	{
	int ret;
	OSSL_PARAM params[2], *p = params;

	if ((ret = dsa_paramgen_check(ctx)) <= 0)
	return ret;

	*p++ = OSSL_PARAM_construct_int(OSSL_PKEY_PARAM_FFC_GINDEX, &gindex);
	*p++ = OSSL_PARAM_construct_end();

	return EVP_PKEY_CTX_set_params(ctx, params);
	}

	int EVP_PKEY_CTX_set_dsa_paramgen_seed(EVP_PKEY_CTX *ctx,
	const unsigned char *seed,
	size_t seedlen)
	{
	int ret;
	OSSL_PARAM params[2], *p = params;

	if ((ret = dsa_paramgen_check(ctx)) <= 0)
	return ret;

	*p++ = OSSL_PARAM_construct_octet_string(OSSL_PKEY_PARAM_FFC_SEED,
	(void *)seed, seedlen);
	*p++ = OSSL_PARAM_construct_end();

	return EVP_PKEY_CTX_set_params(ctx, params);
	}

	int EVP_PKEY_CTX_set_dsa_paramgen_bits(EVP_PKEY_CTX *ctx, int nbits)
	{
	int ret;
	OSSL_PARAM params[2], *p = params;
	size_t bits = nbits;

	if ((ret = dsa_paramgen_check(ctx)) <= 0)
	return ret;

	#if !defined(FIPS_MODE)
	/* TODO(3.0): Remove this eventually when no more legacy */
	if (ctx->op.keymgmt.genctx == NULL)
	return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DSA, EVP_PKEY_OP_PARAMGEN,
	EVP_PKEY_CTRL_DSA_PARAMGEN_BITS, nbits, NULL);
	#endif

	*p++ = OSSL_PARAM_construct_size_t(OSSL_PKEY_PARAM_FFC_PBITS, &bits);
	*p++ = OSSL_PARAM_construct_end();

	return EVP_PKEY_CTX_set_params(ctx, params);
	}

	int EVP_PKEY_CTX_set_dsa_paramgen_q_bits(EVP_PKEY_CTX *ctx, int qbits)
	{
	int ret;
	OSSL_PARAM params[2], *p = params;
	size_t bits2 = qbits;

	if ((ret = dsa_paramgen_check(ctx)) <= 0)
	return ret;

	#if !defined(FIPS_MODE)
	/* TODO(3.0): Remove this eventually when no more legacy */
	if (ctx->op.keymgmt.genctx == NULL)
	return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DSA, EVP_PKEY_OP_PARAMGEN,
	EVP_PKEY_CTRL_DSA_PARAMGEN_Q_BITS, qbits, NULL);
	#endif

	*p++ = OSSL_PARAM_construct_size_t(OSSL_PKEY_PARAM_FFC_QBITS, &bits2);
	*p++ = OSSL_PARAM_construct_end();

	return EVP_PKEY_CTX_set_params(ctx, params);
	}

	int EVP_PKEY_CTX_set_dsa_paramgen_md_props(EVP_PKEY_CTX *ctx,
	const char *md_name,
	const char *md_properties)
	{
	int ret;
	OSSL_PARAM params[3], *p = params;

	if ((ret = dsa_paramgen_check(ctx)) <= 0)
	return ret;

	#if !defined(FIPS_MODE)
	/* TODO(3.0): Remove this eventually when no more legacy */
	if (ctx->op.keymgmt.genctx == NULL) {
	const EVP_MD *md = EVP_get_digestbyname(md_name);

	EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DSA, EVP_PKEY_OP_PARAMGEN,
	EVP_PKEY_CTRL_DSA_PARAMGEN_MD, 0, (void *)(md));
	}
	#endif

	*p++ = OSSL_PARAM_construct_utf8_string(OSSL_PKEY_PARAM_FFC_DIGEST,
	(char *)md_name, 0);
	if (md_properties != NULL)
	*p++ = OSSL_PARAM_construct_utf8_string(OSSL_PKEY_PARAM_FFC_DIGEST_PROPS,
	(char *)md_properties, 0);
	*p++ = OSSL_PARAM_construct_end();

	return EVP_PKEY_CTX_set_params(ctx, params);
	}

	#if !defined(FIPS_MODE)
	int EVP_PKEY_CTX_set_dsa_paramgen_md(EVP_PKEY_CTX ctx, const EVP_MD md)
	{
	const char *md_name = (md == NULL) ? "" : EVP_MD_name(md);

	return EVP_PKEY_CTX_set_dsa_paramgen_md_props(ctx, md_name, NULL);
	}
	#endif