crypto/dh/dh_pmeth.c - third_party/openssl - Git at Google

 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
  * project 2006.
  */
 /* ====================================================================
  * Copyright (c) 2006 The OpenSSL Project.  All rights reserved.
  *
  * 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 above 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 acknowledgment:
  *    "This product includes software developed by the OpenSSL Project
  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  *
  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  *    endorse or promote products derived from this software without
  *    prior written permission. For written permission, please contact
  *    licensing@OpenSSL.org.
  *
  * 5. Products derived from this software may not be called "OpenSSL"
  *    nor may "OpenSSL" appear in their names without prior written
  *    permission of the OpenSSL Project.
  *
  * 6. Redistributions of any form whatsoever must retain the following
  *    acknowledgment:
  *    "This product includes software developed by the OpenSSL Project
  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  *
  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  * EXPRESSED 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 OpenSSL PROJECT OR
  * ITS 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.
  * ====================================================================
  *
  * This product includes cryptographic software written by Eric Young
  * (eay@cryptsoft.com).  This product includes software written by Tim
  * Hudson (tjh@cryptsoft.com).
  *
  */

 #include <stdio.h>
 #include "cryptlib.h"
 #include <openssl/asn1t.h>
 #include <openssl/x509.h>
 #include <openssl/evp.h>
 #include <openssl/dh.h>
 #include <openssl/bn.h>
 #ifndef OPENSSL_NO_DSA
 #include <openssl/dsa.h>
 #endif
 #include <openssl/objects.h>
 #include "evp_locl.h"

 /* DH pkey context structure */

 typedef struct
 	{
 	/* Parameter gen parameters */
 	int prime_len;
 	int generator;
 	int use_dsa;
 	int subprime_len;
 	/* message digest used for parameter generation */
 	const EVP_MD *md;
 	int rfc5114_param;
 	/* Keygen callback info */
 	int gentmp[2];
 	/* KDF (if any) to use for DH */
 	char kdf_type;
 	/* OID to use for KDF */
 	ASN1_OBJECT *kdf_oid;
 	/* Message digest to use for key derivation */
 	const EVP_MD *kdf_md;
 	/* User key material */
 	unsigned char *kdf_ukm;
 	size_t kdf_ukmlen;
 	/* KDF output length */
 	size_t kdf_outlen;
 	} DH_PKEY_CTX;

 static int pkey_dh_init(EVP_PKEY_CTX *ctx)
 	{
 	DH_PKEY_CTX *dctx;
 	dctx = OPENSSL_malloc(sizeof(DH_PKEY_CTX));
 	if (!dctx)
 		return 0;
 	dctx->prime_len = 1024;
 	dctx->subprime_len = -1;
 	dctx->generator = 2;
 	dctx->use_dsa = 0;
 	dctx->md = NULL;
 	dctx->rfc5114_param = 0;

 	dctx->kdf_type = EVP_PKEY_DH_KDF_NONE;
 	dctx->kdf_oid = NULL;
 	dctx->kdf_md = NULL;
 	dctx->kdf_ukm = NULL;
 	dctx->kdf_ukmlen = 0;
 	dctx->kdf_outlen = 0;

 	ctx->data = dctx;
 	ctx->keygen_info = dctx->gentmp;
 	ctx->keygen_info_count = 2;

 	return 1;
 	}

 static int pkey_dh_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
 	{
 	DH_PKEY_CTX *dctx, *sctx;
 	if (!pkey_dh_init(dst))
 		return 0;
        	sctx = src->data;
 	dctx = dst->data;
 	dctx->prime_len = sctx->prime_len;
 	dctx->subprime_len = sctx->subprime_len;
 	dctx->generator = sctx->generator;
 	dctx->use_dsa = sctx->use_dsa;
 	dctx->md = sctx->md;
 	dctx->rfc5114_param = sctx->rfc5114_param;

 	dctx->kdf_type = sctx->kdf_type;
 	dctx->kdf_oid = OBJ_dup(sctx->kdf_oid);
 	if (!dctx->kdf_oid)
 		return 0;
 	dctx->kdf_md = sctx->kdf_md;
 	if (dctx->kdf_ukm)
 		{
 		dctx->kdf_ukm = BUF_memdup(sctx->kdf_ukm, sctx->kdf_ukmlen);
 		dctx->kdf_ukmlen = sctx->kdf_ukmlen;
 		}
 	dctx->kdf_outlen = sctx->kdf_outlen;
 	return 1;
 	}

 static void pkey_dh_cleanup(EVP_PKEY_CTX *ctx)
 	{
 	DH_PKEY_CTX *dctx = ctx->data;
 	if (dctx)
 		{
 		if (dctx->kdf_ukm)
 			OPENSSL_free(dctx->kdf_ukm);
 		if (dctx->kdf_oid)
 			ASN1_OBJECT_free(dctx->kdf_oid);
 		OPENSSL_free(dctx);
 		}
 	}

 static int pkey_dh_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
 	{
 	DH_PKEY_CTX *dctx = ctx->data;
 	switch (type)
 		{
 		case EVP_PKEY_CTRL_DH_PARAMGEN_PRIME_LEN:
 		if (p1 < 256)
 			return -2;
 		dctx->prime_len = p1;
 		return 1;

 		case EVP_PKEY_CTRL_DH_PARAMGEN_SUBPRIME_LEN:
 		if (dctx->use_dsa == 0)
 			return -2;
 		dctx->subprime_len = p1;
 		return 1;

 		case EVP_PKEY_CTRL_DH_PARAMGEN_GENERATOR:
 		if (dctx->use_dsa)
 			return -2;
 		dctx->generator = p1;
 		return 1;

 		case EVP_PKEY_CTRL_DH_PARAMGEN_TYPE:
 #ifdef OPENSSL_NO_DSA
 		if (p1 != 0)
 			return -2;
 #else
 		if (p1 < 0 || p1 > 2)
 			return -2;
 #endif
 		dctx->use_dsa = p1;
 		return 1;

 		case EVP_PKEY_CTRL_DH_RFC5114:
 		if (p1 < 1 || p1 > 3)
 			return -2;
 		dctx->rfc5114_param = p1;
 		return 1;

 		case EVP_PKEY_CTRL_PEER_KEY:
 		/* Default behaviour is OK */
 		return 1;

 		case EVP_PKEY_CTRL_DH_KDF_TYPE:
 		if (p1 == -2)
 			return dctx->kdf_type;
 		if (p1 != EVP_PKEY_DH_KDF_NONE &&
 		    p1 != EVP_PKEY_DH_KDF_X9_42)
 			return -2;
 		dctx->kdf_type = p1;
 		return 1;

 		case EVP_PKEY_CTRL_DH_KDF_MD:
 		dctx->kdf_md = p2;
 		return 1;

 		case EVP_PKEY_CTRL_GET_DH_KDF_MD:
 		*(const EVP_MD **)p2 = dctx->kdf_md;
 		return 1;

 		case EVP_PKEY_CTRL_DH_KDF_OUTLEN:
 		if (p1 <= 0)
 			return -2;
 		dctx->kdf_outlen = (size_t)p1;
 		return 1;

 		case EVP_PKEY_CTRL_GET_DH_KDF_OUTLEN:
 		*(int *)p2 = dctx->kdf_outlen;
 		return 1;

 		case EVP_PKEY_CTRL_DH_KDF_UKM:
 		if (dctx->kdf_ukm)
 			OPENSSL_free(dctx->kdf_ukm);
 		dctx->kdf_ukm = p2;
 		if (p2)
 			dctx->kdf_ukmlen = p1;
 		else
 			dctx->kdf_ukmlen = 0;
 		return 1;

 		case EVP_PKEY_CTRL_GET_DH_KDF_UKM:
 		*(unsigned char **)p2 = dctx->kdf_ukm;
 		return dctx->kdf_ukmlen;

 		case EVP_PKEY_CTRL_DH_KDF_OID:
 		if (dctx->kdf_oid)
 			ASN1_OBJECT_free(dctx->kdf_oid);
 		dctx->kdf_oid = p2;
 		return 1;

 		case EVP_PKEY_CTRL_GET_DH_KDF_OID:
 		*(ASN1_OBJECT **)p2 = dctx->kdf_oid;
 		return 1;

 		default:
 		return -2;

 		}
 	}


 static int pkey_dh_ctrl_str(EVP_PKEY_CTX *ctx,
 			const char *type, const char *value)
 	{
 	if (!strcmp(type, "dh_paramgen_prime_len"))
 		{
 		int len;
 		len = atoi(value);
 		return EVP_PKEY_CTX_set_dh_paramgen_prime_len(ctx, len);
 		}
 	if (!strcmp(type, "dh_rfc5114"))
 		{
 		DH_PKEY_CTX *dctx = ctx->data;
 		int len;
 		len = atoi(value);
 		if (len < 0 || len > 3)
 			return -2;
 		dctx->rfc5114_param = len;
 		return 1;
 		}
 	if (!strcmp(type, "dh_paramgen_generator"))
 		{
 		int len;
 		len = atoi(value);
 		return EVP_PKEY_CTX_set_dh_paramgen_generator(ctx, len);
 		}
 	if (!strcmp(type, "dh_paramgen_subprime_len"))
 		{
 		int len;
 		len = atoi(value);
 		return EVP_PKEY_CTX_set_dh_paramgen_subprime_len(ctx, len);
 		}
 	if (!strcmp(type, "dh_paramgen_type"))
 		{
 		int typ;
 		typ = atoi(value);
 		return EVP_PKEY_CTX_set_dh_paramgen_type(ctx, typ);
 		}
 	return -2;
 	}

 #ifndef OPENSSL_NO_DSA

 extern int dsa_builtin_paramgen(DSA *ret, size_t bits, size_t qbits,
         const EVP_MD *evpmd, const unsigned char *seed_in, size_t seed_len,
         unsigned char *seed_out,
         int *counter_ret, unsigned long *h_ret, BN_GENCB *cb);

 extern int dsa_builtin_paramgen2(DSA *ret, size_t L, size_t N,
         const EVP_MD *evpmd, const unsigned char *seed_in, size_t seed_len,
         int idx, unsigned char *seed_out,
         int *counter_ret, unsigned long *h_ret, BN_GENCB *cb);

 static DSA *dsa_dh_generate(DH_PKEY_CTX *dctx, BN_GENCB *pcb)
 	{
 	DSA *ret;
 	int rv = 0;
 	int prime_len = dctx->prime_len;
 	int subprime_len = dctx->subprime_len;
 	const EVP_MD *md = dctx->md;
 	if (dctx->use_dsa > 2)
 		return NULL;
 	ret = DSA_new();
 	if (!ret)
 		return NULL;
 	if (subprime_len == -1)
 		{
 		if (prime_len >= 2048)
 			subprime_len = 256;
 		else
 			subprime_len = 160;
 		}
 	if (md == NULL)
 		{
 		if (prime_len >= 2048)
 			md = EVP_sha256();
 		else
 			md = EVP_sha1();
 		}
 	if (dctx->use_dsa == 1)
 		rv = dsa_builtin_paramgen(ret, prime_len, subprime_len, md,
 						NULL, 0, NULL, NULL, NULL, pcb);
 	else if(dctx->use_dsa == 2)
 		rv = dsa_builtin_paramgen2(ret, prime_len, subprime_len, md,
 					   NULL, 0, -1, NULL, NULL, NULL, pcb);
 	if (rv <= 0)
 		{
 		DSA_free(ret);
 		return NULL;
 		}
 	return ret;
 	}

 #endif

 static int pkey_dh_paramgen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
 	{
 	DH *dh = NULL;
 	DH_PKEY_CTX *dctx = ctx->data;
 	BN_GENCB *pcb, cb;
 	int ret;
 	if (dctx->rfc5114_param)
 		{
 		switch (dctx->rfc5114_param)
 			{
 			case 1:
 			dh = DH_get_1024_160();
 			break;

 			case 2:
 			dh = DH_get_2048_224();
 			break;

 			case 3:
 			dh = DH_get_2048_256();
 			break;

 			default:
 			return -2;
 			}
 		EVP_PKEY_assign(pkey, EVP_PKEY_DHX, dh);
 		return 1;
 		}

 	if (ctx->pkey_gencb)
 		{
 		pcb = &cb;
 		evp_pkey_set_cb_translate(pcb, ctx);
 		}
 	else
 		pcb = NULL;
 #ifndef OPENSSL_NO_DSA
 	if (dctx->use_dsa)
 		{
 		DSA *dsa_dh;
 		dsa_dh = dsa_dh_generate(dctx, pcb);
 		if (!dsa_dh)
 			return 0;
 		dh = DSA_dup_DH(dsa_dh);
 		DSA_free(dsa_dh);
 		if (!dh)
 			return 0;
 		EVP_PKEY_assign(pkey, EVP_PKEY_DHX, dh);
 		return 1;
 		}
 #endif
 	dh = DH_new();
 	if (!dh)
 		return 0;
 	ret = DH_generate_parameters_ex(dh,
 					dctx->prime_len, dctx->generator, pcb);

 	if (ret)
 		EVP_PKEY_assign_DH(pkey, dh);
 	else
 		DH_free(dh);
 	return ret;
 	}

 static int pkey_dh_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
 	{
 	DH *dh = NULL;
 	if (ctx->pkey == NULL)
 		{
 		DHerr(DH_F_PKEY_DH_KEYGEN, DH_R_NO_PARAMETERS_SET);
 		return 0;
 		}
 	dh = DH_new();
 	if (!dh)
 		return 0;
 	EVP_PKEY_assign(pkey, ctx->pmeth->pkey_id, dh);
 	/* Note: if error return, pkey is freed by parent routine */
 	if (!EVP_PKEY_copy_parameters(pkey, ctx->pkey))
 		return 0;
 	return DH_generate_key(pkey->pkey.dh);
 	}

 static int pkey_dh_derive(EVP_PKEY_CTX *ctx, unsigned char *key, size_t *keylen)
 	{
 	int ret;
 	DH *dh;
 	DH_PKEY_CTX *dctx = ctx->data;
 	BIGNUM *dhpub;
 	if (!ctx->pkey || !ctx->peerkey)
 		{
 		DHerr(DH_F_PKEY_DH_DERIVE, DH_R_KEYS_NOT_SET);
 		return 0;
 		}
 	dh = ctx->pkey->pkey.dh;
 	dhpub = ctx->peerkey->pkey.dh->pub_key;
 	if (dctx->kdf_type == EVP_PKEY_DH_KDF_NONE)
 		{
 		if (key == NULL)
 			{
 			*keylen = DH_size(dh);
 			return 1;
 			}
 		ret = DH_compute_key(key, dhpub, dh);
 		if (ret < 0)
 			return ret;
 		*keylen = ret;
 		return 1;
 		}
 	else if (dctx->kdf_type == EVP_PKEY_DH_KDF_X9_42)
 		{
 		unsigned char *Z = NULL;
 		size_t Zlen = 0;
 		if (!dctx->kdf_outlen || !dctx->kdf_oid)
 			return 0;
 		if (key == NULL)
 			{
 			*keylen = dctx->kdf_outlen;
 			return 1;
 			}
 		if (*keylen != dctx->kdf_outlen)
 			return 0;
 		ret = 0;
 		Zlen = DH_size(dh);
 		Z = OPENSSL_malloc(Zlen);
 		if (DH_compute_key_padded(Z, dhpub, dh) <= 0)
 			goto err;
 		if (!DH_KDF_X9_42(key, *keylen, Z, Zlen, dctx->kdf_oid,
 					dctx->kdf_ukm, dctx->kdf_ukmlen,
 					dctx->kdf_md))
 			goto err;
 		*keylen = dctx->kdf_outlen;
 		ret = 1;
 		err:
 		if (Z)
 			{
 			OPENSSL_cleanse(Z, Zlen);
 			OPENSSL_free(Z);
 			}
 		return ret;
 		}
 	return 1;
 	}

 const EVP_PKEY_METHOD dh_pkey_meth =
 	{
 	EVP_PKEY_DH,
 	0,
 	pkey_dh_init,
 	pkey_dh_copy,
 	pkey_dh_cleanup,

 	0,
 	pkey_dh_paramgen,

 	0,
 	pkey_dh_keygen,

 	0,
 	0,

 	0,
 	0,

 	0,0,

 	0,0,0,0,

 	0,0,

 	0,0,

 	0,
 	pkey_dh_derive,

 	pkey_dh_ctrl,
 	pkey_dh_ctrl_str

 	};

 const EVP_PKEY_METHOD dhx_pkey_meth =
 	{
 	EVP_PKEY_DHX,
 	0,
 	pkey_dh_init,
 	pkey_dh_copy,
 	pkey_dh_cleanup,

 	0,
 	pkey_dh_paramgen,

 	0,
 	pkey_dh_keygen,

 	0,
 	0,

 	0,
 	0,

 	0,0,

 	0,0,0,0,

 	0,0,

 	0,0,

 	0,
 	pkey_dh_derive,

 	pkey_dh_ctrl,
 	pkey_dh_ctrl_str

 	};
	/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
	* project 2006.
	*/
	/* ====================================================================
	* Copyright (c) 2006 The OpenSSL Project. All rights reserved.
	*
	* 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 above 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 acknowledgment:
	* "This product includes software developed by the OpenSSL Project
	* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
	*
	* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
	* endorse or promote products derived from this software without
	* prior written permission. For written permission, please contact
	* licensing@OpenSSL.org.
	*
	* 5. Products derived from this software may not be called "OpenSSL"
	* nor may "OpenSSL" appear in their names without prior written
	* permission of the OpenSSL Project.
	*
	* 6. Redistributions of any form whatsoever must retain the following
	* acknowledgment:
	* "This product includes software developed by the OpenSSL Project
	* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
	*
	* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
	* EXPRESSED 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 OpenSSL PROJECT OR
	* ITS 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.
	* ====================================================================
	*
	* This product includes cryptographic software written by Eric Young
	* (eay@cryptsoft.com). This product includes software written by Tim
	* Hudson (tjh@cryptsoft.com).
	*
	*/

	#include <stdio.h>
	#include "cryptlib.h"
	#include <openssl/asn1t.h>
	#include <openssl/x509.h>
	#include <openssl/evp.h>
	#include <openssl/dh.h>
	#include <openssl/bn.h>
	#ifndef OPENSSL_NO_DSA
	#include <openssl/dsa.h>
	#endif
	#include <openssl/objects.h>
	#include "evp_locl.h"

	/* DH pkey context structure */

	typedef struct
	{
	/* Parameter gen parameters */
	int prime_len;
	int generator;
	int use_dsa;
	int subprime_len;
	/* message digest used for parameter generation */
	const EVP_MD *md;
	int rfc5114_param;
	/* Keygen callback info */
	int gentmp[2];
	/* KDF (if any) to use for DH */
	char kdf_type;
	/* OID to use for KDF */
	ASN1_OBJECT *kdf_oid;
	/* Message digest to use for key derivation */
	const EVP_MD *kdf_md;
	/* User key material */
	unsigned char *kdf_ukm;
	size_t kdf_ukmlen;
	/* KDF output length */
	size_t kdf_outlen;
	} DH_PKEY_CTX;

	static int pkey_dh_init(EVP_PKEY_CTX *ctx)
	{
	DH_PKEY_CTX *dctx;
	dctx = OPENSSL_malloc(sizeof(DH_PKEY_CTX));
	if (!dctx)
	return 0;
	dctx->prime_len = 1024;
	dctx->subprime_len = -1;
	dctx->generator = 2;
	dctx->use_dsa = 0;
	dctx->md = NULL;
	dctx->rfc5114_param = 0;

	dctx->kdf_type = EVP_PKEY_DH_KDF_NONE;
	dctx->kdf_oid = NULL;
	dctx->kdf_md = NULL;
	dctx->kdf_ukm = NULL;
	dctx->kdf_ukmlen = 0;
	dctx->kdf_outlen = 0;

	ctx->data = dctx;
	ctx->keygen_info = dctx->gentmp;
	ctx->keygen_info_count = 2;

	return 1;
	}

	static int pkey_dh_copy(EVP_PKEY_CTX dst, EVP_PKEY_CTX src)
	{
	DH_PKEY_CTX dctx, sctx;
	if (!pkey_dh_init(dst))
	return 0;
	sctx = src->data;
	dctx = dst->data;
	dctx->prime_len = sctx->prime_len;
	dctx->subprime_len = sctx->subprime_len;
	dctx->generator = sctx->generator;
	dctx->use_dsa = sctx->use_dsa;
	dctx->md = sctx->md;
	dctx->rfc5114_param = sctx->rfc5114_param;

	dctx->kdf_type = sctx->kdf_type;
	dctx->kdf_oid = OBJ_dup(sctx->kdf_oid);
	if (!dctx->kdf_oid)
	return 0;
	dctx->kdf_md = sctx->kdf_md;
	if (dctx->kdf_ukm)
	{
	dctx->kdf_ukm = BUF_memdup(sctx->kdf_ukm, sctx->kdf_ukmlen);
	dctx->kdf_ukmlen = sctx->kdf_ukmlen;
	}
	dctx->kdf_outlen = sctx->kdf_outlen;
	return 1;
	}

	static void pkey_dh_cleanup(EVP_PKEY_CTX *ctx)
	{
	DH_PKEY_CTX *dctx = ctx->data;
	if (dctx)
	{
	if (dctx->kdf_ukm)
	OPENSSL_free(dctx->kdf_ukm);
	if (dctx->kdf_oid)
	ASN1_OBJECT_free(dctx->kdf_oid);
	OPENSSL_free(dctx);
	}
	}

	static int pkey_dh_ctrl(EVP_PKEY_CTX ctx, int type, int p1, void p2)
	{
	DH_PKEY_CTX *dctx = ctx->data;
	switch (type)
	{
	case EVP_PKEY_CTRL_DH_PARAMGEN_PRIME_LEN:
	if (p1 < 256)
	return -2;
	dctx->prime_len = p1;
	return 1;

	case EVP_PKEY_CTRL_DH_PARAMGEN_SUBPRIME_LEN:
	if (dctx->use_dsa == 0)
	return -2;
	dctx->subprime_len = p1;
	return 1;

	case EVP_PKEY_CTRL_DH_PARAMGEN_GENERATOR:
	if (dctx->use_dsa)
	return -2;
	dctx->generator = p1;
	return 1;

	case EVP_PKEY_CTRL_DH_PARAMGEN_TYPE:
	#ifdef OPENSSL_NO_DSA
	if (p1 != 0)
	return -2;
	#else
	if (p1 < 0 \|\| p1 > 2)
	return -2;
	#endif
	dctx->use_dsa = p1;
	return 1;

	case EVP_PKEY_CTRL_DH_RFC5114:
	if (p1 < 1 \|\| p1 > 3)
	return -2;
	dctx->rfc5114_param = p1;
	return 1;

	case EVP_PKEY_CTRL_PEER_KEY:
	/* Default behaviour is OK */
	return 1;

	case EVP_PKEY_CTRL_DH_KDF_TYPE:
	if (p1 == -2)
	return dctx->kdf_type;
	if (p1 != EVP_PKEY_DH_KDF_NONE &&
	p1 != EVP_PKEY_DH_KDF_X9_42)
	return -2;
	dctx->kdf_type = p1;
	return 1;

	case EVP_PKEY_CTRL_DH_KDF_MD:
	dctx->kdf_md = p2;
	return 1;

	case EVP_PKEY_CTRL_GET_DH_KDF_MD:
	(const EVP_MD *)p2 = dctx->kdf_md;
	return 1;

	case EVP_PKEY_CTRL_DH_KDF_OUTLEN:
	if (p1 <= 0)
	return -2;
	dctx->kdf_outlen = (size_t)p1;
	return 1;

	case EVP_PKEY_CTRL_GET_DH_KDF_OUTLEN:
	(int )p2 = dctx->kdf_outlen;
	return 1;

	case EVP_PKEY_CTRL_DH_KDF_UKM:
	if (dctx->kdf_ukm)
	OPENSSL_free(dctx->kdf_ukm);
	dctx->kdf_ukm = p2;
	if (p2)
	dctx->kdf_ukmlen = p1;
	else
	dctx->kdf_ukmlen = 0;
	return 1;

	case EVP_PKEY_CTRL_GET_DH_KDF_UKM:
	(unsigned char *)p2 = dctx->kdf_ukm;
	return dctx->kdf_ukmlen;

	case EVP_PKEY_CTRL_DH_KDF_OID:
	if (dctx->kdf_oid)
	ASN1_OBJECT_free(dctx->kdf_oid);
	dctx->kdf_oid = p2;
	return 1;

	case EVP_PKEY_CTRL_GET_DH_KDF_OID:
	(ASN1_OBJECT *)p2 = dctx->kdf_oid;
	return 1;

	default:
	return -2;

	}
	}


	static int pkey_dh_ctrl_str(EVP_PKEY_CTX *ctx,
	const char type, const char value)
	{
	if (!strcmp(type, "dh_paramgen_prime_len"))
	{
	int len;
	len = atoi(value);
	return EVP_PKEY_CTX_set_dh_paramgen_prime_len(ctx, len);
	}
	if (!strcmp(type, "dh_rfc5114"))
	{
	DH_PKEY_CTX *dctx = ctx->data;
	int len;
	len = atoi(value);
	if (len < 0 \|\| len > 3)
	return -2;
	dctx->rfc5114_param = len;
	return 1;
	}
	if (!strcmp(type, "dh_paramgen_generator"))
	{
	int len;
	len = atoi(value);
	return EVP_PKEY_CTX_set_dh_paramgen_generator(ctx, len);
	}
	if (!strcmp(type, "dh_paramgen_subprime_len"))
	{
	int len;
	len = atoi(value);
	return EVP_PKEY_CTX_set_dh_paramgen_subprime_len(ctx, len);
	}
	if (!strcmp(type, "dh_paramgen_type"))
	{
	int typ;
	typ = atoi(value);
	return EVP_PKEY_CTX_set_dh_paramgen_type(ctx, typ);
	}
	return -2;
	}

	#ifndef OPENSSL_NO_DSA

	extern int dsa_builtin_paramgen(DSA *ret, size_t bits, size_t qbits,
	const EVP_MD evpmd, const unsigned char seed_in, size_t seed_len,
	unsigned char *seed_out,
	int counter_ret, unsigned long h_ret, BN_GENCB *cb);

	extern int dsa_builtin_paramgen2(DSA *ret, size_t L, size_t N,
	const EVP_MD evpmd, const unsigned char seed_in, size_t seed_len,
	int idx, unsigned char *seed_out,
	int counter_ret, unsigned long h_ret, BN_GENCB *cb);

	static DSA dsa_dh_generate(DH_PKEY_CTX dctx, BN_GENCB *pcb)
	{
	DSA *ret;
	int rv = 0;
	int prime_len = dctx->prime_len;
	int subprime_len = dctx->subprime_len;
	const EVP_MD *md = dctx->md;
	if (dctx->use_dsa > 2)
	return NULL;
	ret = DSA_new();
	if (!ret)
	return NULL;
	if (subprime_len == -1)
	{
	if (prime_len >= 2048)
	subprime_len = 256;
	else
	subprime_len = 160;
	}
	if (md == NULL)
	{
	if (prime_len >= 2048)
	md = EVP_sha256();
	else
	md = EVP_sha1();
	}
	if (dctx->use_dsa == 1)
	rv = dsa_builtin_paramgen(ret, prime_len, subprime_len, md,
	NULL, 0, NULL, NULL, NULL, pcb);
	else if(dctx->use_dsa == 2)
	rv = dsa_builtin_paramgen2(ret, prime_len, subprime_len, md,
	NULL, 0, -1, NULL, NULL, NULL, pcb);
	if (rv <= 0)
	{
	DSA_free(ret);
	return NULL;
	}
	return ret;
	}

	#endif

	static int pkey_dh_paramgen(EVP_PKEY_CTX ctx, EVP_PKEY pkey)
	{
	DH *dh = NULL;
	DH_PKEY_CTX *dctx = ctx->data;
	BN_GENCB *pcb, cb;
	int ret;
	if (dctx->rfc5114_param)
	{
	switch (dctx->rfc5114_param)
	{
	case 1:
	dh = DH_get_1024_160();
	break;

	case 2:
	dh = DH_get_2048_224();
	break;

	case 3:
	dh = DH_get_2048_256();
	break;

	default:
	return -2;
	}
	EVP_PKEY_assign(pkey, EVP_PKEY_DHX, dh);
	return 1;
	}

	if (ctx->pkey_gencb)
	{
	pcb = &cb;
	evp_pkey_set_cb_translate(pcb, ctx);
	}
	else
	pcb = NULL;
	#ifndef OPENSSL_NO_DSA
	if (dctx->use_dsa)
	{
	DSA *dsa_dh;
	dsa_dh = dsa_dh_generate(dctx, pcb);
	if (!dsa_dh)
	return 0;
	dh = DSA_dup_DH(dsa_dh);
	DSA_free(dsa_dh);
	if (!dh)
	return 0;
	EVP_PKEY_assign(pkey, EVP_PKEY_DHX, dh);
	return 1;
	}
	#endif
	dh = DH_new();
	if (!dh)
	return 0;
	ret = DH_generate_parameters_ex(dh,
	dctx->prime_len, dctx->generator, pcb);

	if (ret)
	EVP_PKEY_assign_DH(pkey, dh);
	else
	DH_free(dh);
	return ret;
	}

	static int pkey_dh_keygen(EVP_PKEY_CTX ctx, EVP_PKEY pkey)
	{
	DH *dh = NULL;
	if (ctx->pkey == NULL)
	{
	DHerr(DH_F_PKEY_DH_KEYGEN, DH_R_NO_PARAMETERS_SET);
	return 0;
	}
	dh = DH_new();
	if (!dh)
	return 0;
	EVP_PKEY_assign(pkey, ctx->pmeth->pkey_id, dh);
	/* Note: if error return, pkey is freed by parent routine */
	if (!EVP_PKEY_copy_parameters(pkey, ctx->pkey))
	return 0;
	return DH_generate_key(pkey->pkey.dh);
	}

	static int pkey_dh_derive(EVP_PKEY_CTX ctx, unsigned char key, size_t *keylen)
	{
	int ret;
	DH *dh;
	DH_PKEY_CTX *dctx = ctx->data;
	BIGNUM *dhpub;
	if (!ctx->pkey \|\| !ctx->peerkey)
	{
	DHerr(DH_F_PKEY_DH_DERIVE, DH_R_KEYS_NOT_SET);
	return 0;
	}
	dh = ctx->pkey->pkey.dh;
	dhpub = ctx->peerkey->pkey.dh->pub_key;
	if (dctx->kdf_type == EVP_PKEY_DH_KDF_NONE)
	{
	if (key == NULL)
	{
	*keylen = DH_size(dh);
	return 1;
	}
	ret = DH_compute_key(key, dhpub, dh);
	if (ret < 0)
	return ret;
	*keylen = ret;
	return 1;
	}
	else if (dctx->kdf_type == EVP_PKEY_DH_KDF_X9_42)
	{
	unsigned char *Z = NULL;
	size_t Zlen = 0;
	if (!dctx->kdf_outlen \|\| !dctx->kdf_oid)
	return 0;
	if (key == NULL)
	{
	*keylen = dctx->kdf_outlen;
	return 1;
	}
	if (*keylen != dctx->kdf_outlen)
	return 0;
	ret = 0;
	Zlen = DH_size(dh);
	Z = OPENSSL_malloc(Zlen);
	if (DH_compute_key_padded(Z, dhpub, dh) <= 0)
	goto err;
	if (!DH_KDF_X9_42(key, *keylen, Z, Zlen, dctx->kdf_oid,
	dctx->kdf_ukm, dctx->kdf_ukmlen,
	dctx->kdf_md))
	goto err;
	*keylen = dctx->kdf_outlen;
	ret = 1;
	err:
	if (Z)
	{
	OPENSSL_cleanse(Z, Zlen);
	OPENSSL_free(Z);
	}
	return ret;
	}
	return 1;
	}

	const EVP_PKEY_METHOD dh_pkey_meth =
	{
	EVP_PKEY_DH,
	0,
	pkey_dh_init,
	pkey_dh_copy,
	pkey_dh_cleanup,

	0,
	pkey_dh_paramgen,

	0,
	pkey_dh_keygen,

	0,
	0,

	0,
	0,

	0,0,

	0,0,0,0,

	0,0,

	0,0,

	0,
	pkey_dh_derive,

	pkey_dh_ctrl,
	pkey_dh_ctrl_str

	};

	const EVP_PKEY_METHOD dhx_pkey_meth =
	{
	EVP_PKEY_DHX,
	0,
	pkey_dh_init,
	pkey_dh_copy,
	pkey_dh_cleanup,

	0,
	pkey_dh_paramgen,

	0,
	pkey_dh_keygen,

	0,
	0,

	0,
	0,

	0,0,

	0,0,0,0,

	0,0,

	0,0,

	0,
	pkey_dh_derive,

	pkey_dh_ctrl,
	pkey_dh_ctrl_str

	};