[thirdparty/openssl.git] / crypto / dsa / dsa_lib.c

/* crypto/dsa/dsa_lib.c */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * 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.]
 */

/* Original version from Steven Schoch <schoch@sheba.arc.nasa.gov> */

#include <stdio.h>
#include "cryptlib.h"
#include <openssl/bn.h>
#include <openssl/dsa.h>
#include <openssl/asn1.h>
#ifndef OPENSSL_NO_ENGINE
#include <openssl/engine.h>
#endif

const char *DSA_version="DSA" OPENSSL_VERSION_PTEXT;

static const DSA_METHOD *default_DSA_method = NULL;

void DSA_set_default_method(const DSA_METHOD *meth)
	{
	default_DSA_method = meth;
	}

const DSA_METHOD *DSA_get_default_method(void)
	{
	if(!default_DSA_method)
		default_DSA_method = DSA_OpenSSL();
	return default_DSA_method;
	}

DSA *DSA_new(void)
	{
	return DSA_new_method(NULL);
	}

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
	if (dsa->engine)
		{
		ENGINE_finish(dsa->engine);
		dsa->engine = NULL;
		}
#endif
        dsa->meth = meth;
        if (meth->init) meth->init(dsa);
        return 1;
	}

DSA *DSA_new_method(ENGINE *engine)
	{
	DSA *ret;

	ret=(DSA *)OPENSSL_malloc(sizeof(DSA));
	if (ret == NULL)
		{
		DSAerr(DSA_F_DSA_NEW_METHOD,ERR_R_MALLOC_FAILURE);
		return(NULL);
		}
	ret->meth = DSA_get_default_method();
#ifndef OPENSSL_NO_ENGINE
	if (engine)
		{
		if (!ENGINE_init(engine))
			{
			DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_ENGINE_LIB);
			OPENSSL_free(ret);
			return NULL;
			}
		ret->engine = engine;
		}
	else
		ret->engine = ENGINE_get_default_DSA();
	if(ret->engine)
		{
		ret->meth = ENGINE_get_DSA(ret->engine);
		if(!ret->meth)
			{
			DSAerr(DSA_F_DSA_NEW_METHOD,
				ERR_R_ENGINE_LIB);
			ENGINE_finish(ret->engine);
			OPENSSL_free(ret);
			return NULL;
			}
		}
#endif

	ret->pad=0;
	ret->version=0;
	ret->write_params=1;
	ret->p=NULL;
	ret->q=NULL;
	ret->g=NULL;

	ret->pub_key=NULL;
	ret->priv_key=NULL;

	ret->kinv=NULL;
	ret->r=NULL;
	ret->method_mont_p=NULL;

	ret->references=1;
	ret->flags=ret->meth->flags;
	CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data);
	if ((ret->meth->init != NULL) && !ret->meth->init(ret))
		{
#ifndef OPENSSL_NO_ENGINE
		if (ret->engine)
			ENGINE_finish(ret->engine);
#endif
		CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data);
		OPENSSL_free(ret);
		ret=NULL;
		}
	
	return(ret);
	}

void DSA_free(DSA *r)
	{
	int i;

	if (r == NULL) return;

	i=CRYPTO_add(&r->references,-1,CRYPTO_LOCK_DSA);
#ifdef REF_PRINT
	REF_PRINT("DSA",r);
#endif
	if (i > 0) return;
#ifdef REF_CHECK
	if (i < 0)
		{
		fprintf(stderr,"DSA_free, bad reference count\n");
		abort();
		}
#endif

	if(r->meth->finish)
		r->meth->finish(r);
#ifndef OPENSSL_NO_ENGINE
	if(r->engine)
		ENGINE_finish(r->engine);
#endif

	CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, r, &r->ex_data);

	if (r->p != NULL) BN_clear_free(r->p);
	if (r->q != NULL) BN_clear_free(r->q);
	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);
	if (r->kinv != NULL) BN_clear_free(r->kinv);
	if (r->r != NULL) BN_clear_free(r->r);
	OPENSSL_free(r);
	}

int DSA_up_ref(DSA *r)
	{
	int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_DSA);
#ifdef REF_PRINT
	REF_PRINT("DSA",r);
#endif
#ifdef REF_CHECK
	if (i < 2)
		{
		fprintf(stderr, "DSA_up_ref, bad reference count\n");
		abort();
		}
#endif
	return ((i > 1) ? 1 : 0);
	}

int DSA_size(const DSA *r)
	{
	int ret,i;
	ASN1_INTEGER bs;
	unsigned char buf[4];	/* 4 bytes looks really small.
				   However, i2d_ASN1_INTEGER() will not look
				   beyond the first byte, as long as the second
				   parameter is NULL. */

	i=BN_num_bits(r->q);
	bs.length=(i+7)/8;
	bs.data=buf;
	bs.type=V_ASN1_INTEGER;
	/* If the top bit is set the asn1 encoding is 1 larger. */
	buf[0]=0xff;	

	i=i2d_ASN1_INTEGER(&bs,NULL);
	i+=i; /* r and s */
	ret=ASN1_object_size(1,i,V_ASN1_SEQUENCE);
	return(ret);
	}

int DSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
	     CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
        {
	return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DSA, argl, argp,
				new_func, dup_func, free_func);
        }

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(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.
	 */ 

	DH *ret = NULL;

	if (r == NULL)
		goto err;
	ret = DH_new();
	if (ret == NULL)
		goto err;
	if (r->p != NULL) 
		if ((ret->p = BN_dup(r->p)) == NULL)
			goto err;
	if (r->q != NULL)
		ret->length = BN_num_bits(r->q);
	if (r->g != NULL)
		if ((ret->g = BN_dup(r->g)) == NULL)
			goto err;
	if (r->pub_key != NULL)
		if ((ret->pub_key = BN_dup(r->pub_key)) == NULL)
			goto err;
	if (r->priv_key != NULL)
		if ((ret->priv_key = BN_dup(r->priv_key)) == NULL)
			goto err;

	return ret;

 err:
	if (ret != NULL)
		DH_free(ret);
	return NULL;
	}
#endif
Commit	Line	Data
d02b48c6	1	/* crypto/dsa/dsa_lib.c */
58964a49	2	/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
d02b48c6 RE	3	* All rights reserved.
	4	*
	5	* This package is an SSL implementation written
	6	* by Eric Young (eay@cryptsoft.com).
	7	* The implementation was written so as to conform with Netscapes SSL.
	8	*
	9	* This library is free for commercial and non-commercial use as long as
	10	* the following conditions are aheared to. The following conditions
	11	* apply to all code found in this distribution, be it the RC4, RSA,
	12	* lhash, DES, etc., code; not just the SSL code. The SSL documentation
	13	* included with this distribution is covered by the same copyright terms
	14	* except that the holder is Tim Hudson (tjh@cryptsoft.com).
	15	*
	16	* Copyright remains Eric Young's, and as such any Copyright notices in
	17	* the code are not to be removed.
	18	* If this package is used in a product, Eric Young should be given attribution
	19	* as the author of the parts of the library used.
	20	* This can be in the form of a textual message at program startup or
	21	* in documentation (online or textual) provided with the package.
	22	*
	23	* Redistribution and use in source and binary forms, with or without
	24	* modification, are permitted provided that the following conditions
	25	* are met:
	26	* 1. Redistributions of source code must retain the copyright
	27	* notice, this list of conditions and the following disclaimer.
	28	* 2. Redistributions in binary form must reproduce the above copyright
	29	* notice, this list of conditions and the following disclaimer in the
	30	* documentation and/or other materials provided with the distribution.
	31	* 3. All advertising materials mentioning features or use of this software
	32	* must display the following acknowledgement:
	33	* "This product includes cryptographic software written by
	34	* Eric Young (eay@cryptsoft.com)"
	35	* The word 'cryptographic' can be left out if the rouines from the library
	36	* being used are not cryptographic related :-).
	37	* 4. If you include any Windows specific code (or a derivative thereof) from
	38	* the apps directory (application code) you must include an acknowledgement:
	39	* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
	40	*
	41	* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
	42	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	43	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	44	* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
	45	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	46	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	47	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	48	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	49	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	50	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	51	* SUCH DAMAGE.
	52	*
	53	* The licence and distribution terms for any publically available version or
	54	* derivative of this code cannot be changed. i.e. this code cannot simply be
	55	* copied and put under another distribution licence
	56	* [including the GNU Public Licence.]
	57	*/
	58
651d0aff	59	/* Original version from Steven Schoch <schoch@sheba.arc.nasa.gov> */
d02b48c6 RE	60
	61	#include <stdio.h>
	62	#include "cryptlib.h"
ec577822 BM	63	#include <openssl/bn.h>
	64	#include <openssl/dsa.h>
	65	#include <openssl/asn1.h>
0b13e9f0	66	#ifndef OPENSSL_NO_ENGINE
5270e702	67	#include <openssl/engine.h>
0b13e9f0	68	#endif
d02b48c6	69
e778802f	70	const char *DSA_version="DSA" OPENSSL_VERSION_PTEXT;
d02b48c6	71
a75b1915	72	static const DSA_METHOD *default_DSA_method = NULL;
c0711f7f	73
cb78486d GT	74	void DSA_set_default_method(const DSA_METHOD *meth)
	75	{
	76	default_DSA_method = meth;
	77	}
c0711f7f	78
cb78486d GT	79	const DSA_METHOD *DSA_get_default_method(void)
	80	{
	81	if(!default_DSA_method)
	82	default_DSA_method = DSA_OpenSSL();
c0711f7f	83	return default_DSA_method;
cb78486d	84	}
c0711f7f	85
6b691a5c	86	DSA *DSA_new(void)
cb78486d	87	{
c0711f7f	88	return DSA_new_method(NULL);
cb78486d	89	}
c0711f7f	90
cb78486d GT	91	int DSA_set_method(DSA dsa, const DSA_METHOD meth)
	92	{
	93	/* NB: The caller is specifically setting a method, so it's not up to us
	94	* to deal with which ENGINE it comes from. */
	95	const DSA_METHOD *mtmp;
c0711f7f DSH	96	mtmp = dsa->meth;
c0711f7f DSH	97	if (mtmp->finish) mtmp->finish(dsa);
0b13e9f0	98	#ifndef OPENSSL_NO_ENGINE
cb78486d GT	99	if (dsa->engine)
	100	{
	101	ENGINE_finish(dsa->engine);
	102	dsa->engine = NULL;
	103	}
0b13e9f0	104	#endif
c0711f7f DSH	105	dsa->meth = meth;
c0711f7f DSH	106	if (meth->init) meth->init(dsa);
cb78486d	107	return 1;
5270e702	108	}
c0711f7f	109
5270e702	110	DSA DSA_new_method(ENGINE engine)
d02b48c6 RE	111	{
	112	DSA *ret;
	113
26a3a48d	114	ret=(DSA *)OPENSSL_malloc(sizeof(DSA));
d02b48c6 RE	115	if (ret == NULL)
d02b48c6 RE	116	{
0c372b94	117	DSAerr(DSA_F_DSA_NEW_METHOD,ERR_R_MALLOC_FAILURE);
d02b48c6 RE	118	return(NULL);
d02b48c6 RE	119	}
cb78486d	120	ret->meth = DSA_get_default_method();
0b13e9f0	121	#ifndef OPENSSL_NO_ENGINE
0c372b94 DSH	122	if (engine)
	123	{
	124	if (!ENGINE_init(engine))
	125	{
	126	DSAerr(DSA_F_DSA_NEW_METHOD, ERR_R_ENGINE_LIB);
	127	OPENSSL_free(ret);
	128	return NULL;
	129	}
	130	ret->engine = engine;
	131	}
	132	else
cb78486d GT	133	ret->engine = ENGINE_get_default_DSA();
cb78486d GT	134	if(ret->engine)
5270e702	135	{
cb78486d GT	136	ret->meth = ENGINE_get_DSA(ret->engine);
	137	if(!ret->meth)
	138	{
0c372b94	139	DSAerr(DSA_F_DSA_NEW_METHOD,
cb78486d GT	140	ERR_R_ENGINE_LIB);
	141	ENGINE_finish(ret->engine);
	142	OPENSSL_free(ret);
	143	return NULL;
	144	}
5270e702	145	}
0b13e9f0	146	#endif
0c9de428	147
d02b48c6 RE	148	ret->pad=0;
	149	ret->version=0;
	150	ret->write_params=1;
	151	ret->p=NULL;
	152	ret->q=NULL;
	153	ret->g=NULL;
	154
	155	ret->pub_key=NULL;
	156	ret->priv_key=NULL;
	157
	158	ret->kinv=NULL;
	159	ret->r=NULL;
dfeab068	160	ret->method_mont_p=NULL;
d02b48c6 RE	161
d02b48c6 RE	162	ret->references=1;
cb78486d	163	ret->flags=ret->meth->flags;
79aa04ef	164	CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data);
cb78486d	165	if ((ret->meth->init != NULL) && !ret->meth->init(ret))
c0711f7f	166	{
0b13e9f0	167	#ifndef OPENSSL_NO_ENGINE
0c372b94 DSH	168	if (ret->engine)
0c372b94 DSH	169	ENGINE_finish(ret->engine);
0b13e9f0	170	#endif
79aa04ef	171	CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data);
26a3a48d	172	OPENSSL_free(ret);
c0711f7f DSH	173	ret=NULL;
c0711f7f DSH	174	}
c0711f7f	175
d02b48c6 RE	176	return(ret);
	177	}
	178
6b691a5c	179	void DSA_free(DSA *r)
d02b48c6 RE	180	{
	181	int i;
	182
	183	if (r == NULL) return;
	184
	185	i=CRYPTO_add(&r->references,-1,CRYPTO_LOCK_DSA);
58964a49 RE	186	#ifdef REF_PRINT
	187	REF_PRINT("DSA",r);
	188	#endif
d02b48c6 RE	189	if (i > 0) return;
	190	#ifdef REF_CHECK
	191	if (i < 0)
	192	{
	193	fprintf(stderr,"DSA_free, bad reference count\n");
	194	abort();
	195	}
	196	#endif
	197
cb78486d GT	198	if(r->meth->finish)
cb78486d GT	199	r->meth->finish(r);
0b13e9f0	200	#ifndef OPENSSL_NO_ENGINE
cb78486d GT	201	if(r->engine)
cb78486d GT	202	ENGINE_finish(r->engine);
0b13e9f0	203	#endif
c0711f7f	204
79aa04ef	205	CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, r, &r->ex_data);
d50f1bdf	206
d02b48c6 RE	207	if (r->p != NULL) BN_clear_free(r->p);
	208	if (r->q != NULL) BN_clear_free(r->q);
	209	if (r->g != NULL) BN_clear_free(r->g);
	210	if (r->pub_key != NULL) BN_clear_free(r->pub_key);
	211	if (r->priv_key != NULL) BN_clear_free(r->priv_key);
	212	if (r->kinv != NULL) BN_clear_free(r->kinv);
	213	if (r->r != NULL) BN_clear_free(r->r);
26a3a48d	214	OPENSSL_free(r);
d02b48c6 RE	215	}
d02b48c6 RE	216
6ac4e8bd	217	int DSA_up_ref(DSA *r)
5cbc2e8b GT	218	{
	219	int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_DSA);
	220	#ifdef REF_PRINT
	221	REF_PRINT("DSA",r);
	222	#endif
	223	#ifdef REF_CHECK
	224	if (i < 2)
	225	{
6ac4e8bd	226	fprintf(stderr, "DSA_up_ref, bad reference count\n");
5cbc2e8b GT	227	abort();
	228	}
	229	#endif
	230	return ((i > 1) ? 1 : 0);
	231	}
	232
a4aba800	233	int DSA_size(const DSA *r)
d02b48c6 RE	234	{
	235	int ret,i;
	236	ASN1_INTEGER bs;
e9b553da RL	237	unsigned char buf[4]; /* 4 bytes looks really small.
	238	However, i2d_ASN1_INTEGER() will not look
	239	beyond the first byte, as long as the second
	240	parameter is NULL. */
d02b48c6 RE	241
	242	i=BN_num_bits(r->q);
	243	bs.length=(i+7)/8;
	244	bs.data=buf;
	245	bs.type=V_ASN1_INTEGER;
	246	/* If the top bit is set the asn1 encoding is 1 larger. */
	247	buf[0]=0xff;
	248
	249	i=i2d_ASN1_INTEGER(&bs,NULL);
	250	i+=i; /* r and s */
	251	ret=ASN1_object_size(1,i,V_ASN1_SEQUENCE);
	252	return(ret);
	253	}
	254
dd9d233e DSH	255	int DSA_get_ex_new_index(long argl, void argp, CRYPTO_EX_new new_func,
dd9d233e DSH	256	CRYPTO_EX_dup dup_func, CRYPTO_EX_free free_func)
c0711f7f	257	{
79aa04ef GT	258	return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DSA, argl, argp,
79aa04ef GT	259	new_func, dup_func, free_func);
c0711f7f DSH	260	}
c0711f7f DSH	261
dd9d233e	262	int DSA_set_ex_data(DSA d, int idx, void arg)
c0711f7f DSH	263	{
	264	return(CRYPTO_set_ex_data(&d->ex_data,idx,arg));
	265	}
	266
dd9d233e	267	void DSA_get_ex_data(DSA d, int idx)
c0711f7f DSH	268	{
	269	return(CRYPTO_get_ex_data(&d->ex_data,idx));
	270	}
	271
cf1b7d96	272	#ifndef OPENSSL_NO_DH
a4aba800	273	DH DSA_dup_DH(const DSA r)
48c843c3 BM	274	{
	275	/* DSA has p, q, g, optional pub_key, optional priv_key.
	276	* DH has p, optional length, g, optional pub_key, optional priv_key.
	277	*/
	278
a12258fc	279	DH *ret = NULL;
48c843c3 BM	280
	281	if (r == NULL)
	282	goto err;
	283	ret = DH_new();
	284	if (ret == NULL)
	285	goto err;
	286	if (r->p != NULL)
	287	if ((ret->p = BN_dup(r->p)) == NULL)
	288	goto err;
	289	if (r->q != NULL)
	290	ret->length = BN_num_bits(r->q);
	291	if (r->g != NULL)
	292	if ((ret->g = BN_dup(r->g)) == NULL)
	293	goto err;
	294	if (r->pub_key != NULL)
	295	if ((ret->pub_key = BN_dup(r->pub_key)) == NULL)
	296	goto err;
	297	if (r->priv_key != NULL)
	298	if ((ret->priv_key = BN_dup(r->priv_key)) == NULL)
	299	goto err;
	300
	301	return ret;
	302
	303	err:
	304	if (ret != NULL)
	305	DH_free(ret);
	306	return NULL;
	307	}
	308	#endif