[thirdparty/openssl.git] / crypto / ec / ec_pmeth.c

/* 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/ec.h>
#include "ec_lcl.h"
#include <openssl/ecdsa.h>
#include <openssl/evp.h>
#include "evp_locl.h"

/* EC pkey context structure */

typedef struct
	{
	/* Key and paramgen group */
	EC_GROUP *gen_group;
	/* message digest */
	const EVP_MD *md;
	/* Duplicate key if custom cofactor needed */
	EC_KEY *co_key;
	/* Cofactor mode */
	char cofactor_mode;
	/* KDF (if any) to use for ECDH */
	char kdf_type;
	/* 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;

	} EC_PKEY_CTX;

static int pkey_ec_init(EVP_PKEY_CTX *ctx)
	{
	EC_PKEY_CTX *dctx;
	dctx = OPENSSL_malloc(sizeof(EC_PKEY_CTX));
	if (!dctx)
		return 0;
	dctx->gen_group = NULL;
	dctx->md = NULL;

	dctx->cofactor_mode = -1;
	dctx->co_key = NULL;
	dctx->kdf_type = EVP_PKEY_ECDH_KDF_NONE;
	dctx->kdf_md = NULL;
	dctx->kdf_outlen = 0;
	dctx->kdf_ukm = NULL;
	dctx->kdf_ukmlen = 0;

	ctx->data = dctx;

	return 1;
	}

static int pkey_ec_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
	{
	EC_PKEY_CTX *dctx, *sctx;
	if (!pkey_ec_init(dst))
		return 0;
       	sctx = src->data;
	dctx = dst->data;
	if (sctx->gen_group)
		{
		dctx->gen_group = EC_GROUP_dup(sctx->gen_group);
		if (!dctx->gen_group)
			return 0;
		}
	dctx->md = sctx->md;

	if (sctx->co_key)
		{
		dctx->co_key = EC_KEY_dup(sctx->co_key);
		if (!dctx->co_key)
			return 0;
		}
	dctx->kdf_type = sctx->kdf_type;
	dctx->kdf_md = sctx->kdf_md;
	dctx->kdf_outlen = sctx->kdf_outlen;
	if (sctx->kdf_ukm)
		{
		dctx->kdf_ukm = BUF_memdup(sctx->kdf_ukm, sctx->kdf_ukmlen);
		if (!dctx->kdf_ukm)
			return 0;
		}
	else
		dctx->kdf_ukm = NULL;
	dctx->kdf_ukmlen = sctx->kdf_ukmlen;
	return 1;
	}

static void pkey_ec_cleanup(EVP_PKEY_CTX *ctx)
	{
	EC_PKEY_CTX *dctx = ctx->data;
	if (dctx)
		{
		if (dctx->gen_group)
			EC_GROUP_free(dctx->gen_group);
		if (dctx->co_key)
			EC_KEY_free(dctx->co_key);
		if (dctx->kdf_ukm)
			OPENSSL_free(dctx->kdf_ukm);
		OPENSSL_free(dctx);
		}
	}

static int pkey_ec_sign(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
					const unsigned char *tbs, size_t tbslen)
	{
	int ret, type;
	unsigned int sltmp;
	EC_PKEY_CTX *dctx = ctx->data;
	EC_KEY *ec = ctx->pkey->pkey.ec;

	if (!sig)
		{
		*siglen = ECDSA_size(ec);
		return 1;
		}
	else if(*siglen < (size_t)ECDSA_size(ec))
		{
		ECerr(EC_F_PKEY_EC_SIGN, EC_R_BUFFER_TOO_SMALL);
		return 0;
		}

	if (dctx->md)
		type = EVP_MD_type(dctx->md);
	else
		type = NID_sha1;


	ret = ECDSA_sign(type, tbs, tbslen, sig, &sltmp, ec);

	if (ret <= 0)
		return ret;
	*siglen = (size_t)sltmp;
	return 1;
	}

static int pkey_ec_verify(EVP_PKEY_CTX *ctx,
					const unsigned char *sig, size_t siglen,
					const unsigned char *tbs, size_t tbslen)
	{
	int ret, type;
	EC_PKEY_CTX *dctx = ctx->data;
	EC_KEY *ec = ctx->pkey->pkey.ec;

	if (dctx->md)
		type = EVP_MD_type(dctx->md);
	else
		type = NID_sha1;

	ret = ECDSA_verify(type, tbs, tbslen, sig, siglen, ec);

	return ret;
	}

static int pkey_ec_derive(EVP_PKEY_CTX *ctx, unsigned char *key, size_t *keylen)
	{
	int ret;
	size_t outlen;
	const EC_POINT *pubkey = NULL;
	EC_KEY *eckey;
	EC_PKEY_CTX *dctx = ctx->data;
	if (!ctx->pkey || !ctx->peerkey)
		{
		ECerr(EC_F_PKEY_EC_DERIVE, EC_R_KEYS_NOT_SET);
		return 0;
		}

	eckey = dctx->co_key ? dctx->co_key : ctx->pkey->pkey.ec;

	if (!key)
		{
		const EC_GROUP *group;
		group = EC_KEY_get0_group(eckey);
		*keylen = (EC_GROUP_get_degree(group) + 7)/8;
		return 1;
		}
	pubkey = EC_KEY_get0_public_key(ctx->peerkey->pkey.ec);

	/* NB: unlike PKCS#3 DH, if *outlen is less than maximum size this is
	 * not an error, the result is truncated.
	 */

	outlen = *keylen;
		
	ret = ECDH_compute_key(key, outlen, pubkey, eckey, 0);
	if (ret < 0)
		return ret;
	*keylen = ret;
	return 1;
	}

static int pkey_ec_kdf_derive(EVP_PKEY_CTX *ctx,
				unsigned char *key, size_t *keylen)
	{
	EC_PKEY_CTX *dctx = ctx->data;
	unsigned char *ktmp = NULL;
	size_t ktmplen;
	int rv = 0;
	if (dctx->kdf_type == EVP_PKEY_ECDH_KDF_NONE)
		return pkey_ec_derive(ctx, key, keylen);
	if (!key)
		{
		*keylen = dctx->kdf_outlen;
		return 1;
		}
	if (*keylen != dctx->kdf_outlen)
		return 0;
	if (!pkey_ec_derive(ctx, NULL, &ktmplen))
		return 0;
	ktmp = OPENSSL_malloc(ktmplen);
	if (!ktmp)
		return 0;
	if (!pkey_ec_derive(ctx, ktmp, &ktmplen))
		goto err;
	/* Do KDF stuff */
	if (!ECDH_KDF_X9_62(key, *keylen, ktmp, ktmplen, 
				dctx->kdf_ukm, dctx->kdf_ukmlen,
				dctx->kdf_md))
		goto err;
	rv = 1;

	err:
	if (ktmp)
		{
		OPENSSL_cleanse(ktmp, ktmplen);
		OPENSSL_free(ktmp);
		}
	return rv;
	}

static int pkey_ec_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
	{
	EC_PKEY_CTX *dctx = ctx->data;
	EC_GROUP *group;
	switch (type)
		{
		case EVP_PKEY_CTRL_EC_PARAMGEN_CURVE_NID:
		group = EC_GROUP_new_by_curve_name(p1);
		if (group == NULL)
			{
			ECerr(EC_F_PKEY_EC_CTRL, EC_R_INVALID_CURVE);
			return 0;
			}
		if (dctx->gen_group)
			EC_GROUP_free(dctx->gen_group);
		dctx->gen_group = group;
		return 1;

		case EVP_PKEY_CTRL_EC_PARAM_ENC:
		if (!dctx->gen_group)
			{
			ECerr(EC_F_PKEY_EC_CTRL, EC_R_NO_PARAMETERS_SET);
			return 0;
			}
		EC_GROUP_set_asn1_flag(dctx->gen_group, p1);
		return 1;

		case EVP_PKEY_CTRL_EC_ECDH_COFACTOR:
		if (p1 == -2)
			{
			if (dctx->co_key)
				return dctx->cofactor_mode;
			else
				{
				EC_KEY *ec_key = ctx->pkey->pkey.ec;
				return EC_KEY_get_flags(ec_key) & EC_FLAG_COFACTOR_ECDH ? 1 : 0;
				}
			}
		else if (p1 < -1 || p1 > 1)
			return -2;
		dctx->cofactor_mode = p1;
		if (p1 != -1)
			{
			EC_KEY *ec_key = ctx->pkey->pkey.ec;
			if (!ec_key->group)
				return -2;
			/* If cofactor is 1 cofactor mode does nothing */
			if (BN_is_one(&ec_key->group->cofactor))
				return 1;
			if (!dctx->co_key)
				{
				dctx->co_key = EC_KEY_dup(ec_key);
				if (!dctx->co_key)
					return 0;
				}
			if (p1)
				EC_KEY_set_flags(dctx->co_key,
							EC_FLAG_COFACTOR_ECDH);
			else
				EC_KEY_clear_flags(dctx->co_key,
							EC_FLAG_COFACTOR_ECDH);
			}
		else if (dctx->co_key)
			{
			EC_KEY_free(dctx->co_key);
			dctx->co_key = NULL;
			}
		return 1;

		case EVP_PKEY_CTRL_EC_KDF_TYPE:
		if (p1 == -2)
			return dctx->kdf_type;
		if (p1 != EVP_PKEY_ECDH_KDF_NONE &&
		    p1 != EVP_PKEY_ECDH_KDF_X9_62)
			return -2;
		dctx->kdf_type = p1;
		return 1;

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

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

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

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

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

		case EVP_PKEY_CTRL_MD:
		if (EVP_MD_type((const EVP_MD *)p2) != NID_sha1 &&
		    EVP_MD_type((const EVP_MD *)p2) != NID_ecdsa_with_SHA1 &&
		    EVP_MD_type((const EVP_MD *)p2) != NID_sha224 &&
		    EVP_MD_type((const EVP_MD *)p2) != NID_sha256 &&
		    EVP_MD_type((const EVP_MD *)p2) != NID_sha384 &&
		    EVP_MD_type((const EVP_MD *)p2) != NID_sha512)
			{
			ECerr(EC_F_PKEY_EC_CTRL, EC_R_INVALID_DIGEST_TYPE);
			return 0;
			}
		dctx->md = p2;
		return 1;

		case EVP_PKEY_CTRL_GET_MD:
		*(const EVP_MD **)p2 = dctx->md;
		return 1;

		case EVP_PKEY_CTRL_PEER_KEY:
		/* Default behaviour is OK */
		case EVP_PKEY_CTRL_DIGESTINIT:
		case EVP_PKEY_CTRL_PKCS7_SIGN:
		case EVP_PKEY_CTRL_CMS_SIGN:
		return 1;

		default:
		return -2;

		}
	}
			
static int pkey_ec_ctrl_str(EVP_PKEY_CTX *ctx,
			const char *type, const char *value)
	{
	if (!strcmp(type, "ec_paramgen_curve"))
		{
		int nid;
		nid = EC_curve_nist2nid(value);
		if (nid == NID_undef)
			nid = OBJ_sn2nid(value);
		if (nid == NID_undef)
			nid = OBJ_ln2nid(value);
		if (nid == NID_undef)
			{
			ECerr(EC_F_PKEY_EC_CTRL_STR, EC_R_INVALID_CURVE);
			return 0;
			}
		return EVP_PKEY_CTX_set_ec_paramgen_curve_nid(ctx, nid);
		}
	else if (!strcmp(type, "ec_param_enc"))
		{
		int param_enc;
		if (!strcmp(value, "explicit"))
			param_enc = 0;
		else if (!strcmp(value, "named_curve"))
			param_enc = OPENSSL_EC_NAMED_CURVE;
		else
			return -2;
		return EVP_PKEY_CTX_set_ec_param_enc(ctx, param_enc);
		}
			
	return -2;
	}

static int pkey_ec_paramgen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
	{
	EC_KEY *ec = NULL;
	EC_PKEY_CTX *dctx = ctx->data;
	int ret = 0;
	if (dctx->gen_group == NULL)
		{
		ECerr(EC_F_PKEY_EC_PARAMGEN, EC_R_NO_PARAMETERS_SET);
		return 0;
		}
	ec = EC_KEY_new();
	if (!ec)
		return 0;
	ret = EC_KEY_set_group(ec, dctx->gen_group);
	if (ret)
		EVP_PKEY_assign_EC_KEY(pkey, ec);
	else
		EC_KEY_free(ec);
	return ret;
	}

static int pkey_ec_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
	{
	EC_KEY *ec = NULL;
	EC_PKEY_CTX *dctx = ctx->data;
	if (ctx->pkey == NULL && dctx->gen_group == NULL)
		{
		ECerr(EC_F_PKEY_EC_KEYGEN, EC_R_NO_PARAMETERS_SET);
		return 0;
		}
	ec = EC_KEY_new();
	if (!ec)
		return 0;
	EVP_PKEY_assign_EC_KEY(pkey, ec);
	if (ctx->pkey)
		{
		/* Note: if error return, pkey is freed by parent routine */
		if (!EVP_PKEY_copy_parameters(pkey, ctx->pkey))
			return 0;
		}
	else
		{
		if (!EC_KEY_set_group(ec, dctx->gen_group))
			return 0;
		}
	return EC_KEY_generate_key(pkey->pkey.ec);
	}

const EVP_PKEY_METHOD ec_pkey_meth = 
	{
	EVP_PKEY_EC,
	0,
	pkey_ec_init,
	pkey_ec_copy,
	pkey_ec_cleanup,

	0,
	pkey_ec_paramgen,

	0,
	pkey_ec_keygen,

	0,
	pkey_ec_sign,

	0,
	pkey_ec_verify,

	0,0,

	0,0,0,0,

	0,0,

	0,0,

	0,
	pkey_ec_kdf_derive,

	pkey_ec_ctrl,
	pkey_ec_ctrl_str

	};
Commit	Line	Data
2e597528	1	/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
9ca7047d DSH	2	* project 2006.
	3	*/
	4	/* ====================================================================
	5	* Copyright (c) 2006 The OpenSSL Project. All rights reserved.
	6	*
	7	* Redistribution and use in source and binary forms, with or without
	8	* modification, are permitted provided that the following conditions
	9	* are met:
	10	*
	11	* 1. Redistributions of source code must retain the above copyright
	12	* notice, this list of conditions and the following disclaimer.
	13	*
	14	* 2. Redistributions in binary form must reproduce the above copyright
	15	* notice, this list of conditions and the following disclaimer in
	16	* the documentation and/or other materials provided with the
	17	* distribution.
	18	*
	19	* 3. All advertising materials mentioning features or use of this
	20	* software must display the following acknowledgment:
	21	* "This product includes software developed by the OpenSSL Project
	22	* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
	23	*
	24	* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
	25	* endorse or promote products derived from this software without
	26	* prior written permission. For written permission, please contact
	27	* licensing@OpenSSL.org.
	28	*
	29	* 5. Products derived from this software may not be called "OpenSSL"
	30	* nor may "OpenSSL" appear in their names without prior written
	31	* permission of the OpenSSL Project.
	32	*
	33	* 6. Redistributions of any form whatsoever must retain the following
	34	* acknowledgment:
	35	* "This product includes software developed by the OpenSSL Project
	36	* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
	37	*
	38	* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
	39	* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	40	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
	41	* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
	42	* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	43	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	44	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
	45	* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	46	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
	47	* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	48	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
	49	* OF THE POSSIBILITY OF SUCH DAMAGE.
	50	* ====================================================================
	51	*
	52	* This product includes cryptographic software written by Eric Young
	53	* (eay@cryptsoft.com). This product includes software written by Tim
	54	* Hudson (tjh@cryptsoft.com).
	55	*
	56	*/
	57
	58	#include <stdio.h>
	59	#include "cryptlib.h"
	60	#include <openssl/asn1t.h>
	61	#include <openssl/x509.h>
	62	#include <openssl/ec.h>
25af7a5d	63	#include "ec_lcl.h"
9ca7047d DSH	64	#include <openssl/ecdsa.h>
	65	#include <openssl/evp.h>
	66	#include "evp_locl.h"
	67
	68	/* EC pkey context structure */
	69
	70	typedef struct
	71	{
	72	/* Key and paramgen group */
	73	EC_GROUP *gen_group;
	74	/* message digest */
	75	const EVP_MD *md;
25af7a5d DSH	76	/* Duplicate key if custom cofactor needed */
	77	EC_KEY *co_key;
	78	/* Cofactor mode */
	79	char cofactor_mode;
	80	/* KDF (if any) to use for ECDH */
	81	char kdf_type;
	82	/* Message digest to use for key derivation */
	83	const EVP_MD *kdf_md;
	84	/* User key material */
	85	unsigned char *kdf_ukm;
	86	size_t kdf_ukmlen;
	87	/* KDF output length */
	88	size_t kdf_outlen;
	89
9ca7047d DSH	90	} EC_PKEY_CTX;
	91
	92	static int pkey_ec_init(EVP_PKEY_CTX *ctx)
	93	{
	94	EC_PKEY_CTX *dctx;
	95	dctx = OPENSSL_malloc(sizeof(EC_PKEY_CTX));
	96	if (!dctx)
	97	return 0;
	98	dctx->gen_group = NULL;
	99	dctx->md = NULL;
	100
25af7a5d DSH	101	dctx->cofactor_mode = -1;
	102	dctx->co_key = NULL;
	103	dctx->kdf_type = EVP_PKEY_ECDH_KDF_NONE;
	104	dctx->kdf_md = NULL;
	105	dctx->kdf_outlen = 0;
	106	dctx->kdf_ukm = NULL;
	107	dctx->kdf_ukmlen = 0;
	108
9ca7047d DSH	109	ctx->data = dctx;
	110
	111	return 1;
	112	}
	113
8bdcef40 DSH	114	static int pkey_ec_copy(EVP_PKEY_CTX dst, EVP_PKEY_CTX src)
	115	{
	116	EC_PKEY_CTX dctx, sctx;
	117	if (!pkey_ec_init(dst))
	118	return 0;
	119	sctx = src->data;
	120	dctx = dst->data;
	121	if (sctx->gen_group)
	122	{
	123	dctx->gen_group = EC_GROUP_dup(sctx->gen_group);
	124	if (!dctx->gen_group)
	125	return 0;
	126	}
	127	dctx->md = sctx->md;
25af7a5d DSH	128
	129	if (sctx->co_key)
	130	{
	131	dctx->co_key = EC_KEY_dup(sctx->co_key);
	132	if (!dctx->co_key)
	133	return 0;
	134	}
	135	dctx->kdf_type = sctx->kdf_type;
	136	dctx->kdf_md = sctx->kdf_md;
	137	dctx->kdf_outlen = sctx->kdf_outlen;
	138	if (sctx->kdf_ukm)
	139	{
	140	dctx->kdf_ukm = BUF_memdup(sctx->kdf_ukm, sctx->kdf_ukmlen);
	141	if (!dctx->kdf_ukm)
	142	return 0;
	143	}
	144	else
	145	dctx->kdf_ukm = NULL;
	146	dctx->kdf_ukmlen = sctx->kdf_ukmlen;
8bdcef40 DSH	147	return 1;
	148	}
	149
9ca7047d DSH	150	static void pkey_ec_cleanup(EVP_PKEY_CTX *ctx)
	151	{
	152	EC_PKEY_CTX *dctx = ctx->data;
	153	if (dctx)
	154	{
	155	if (dctx->gen_group)
	156	EC_GROUP_free(dctx->gen_group);
25af7a5d DSH	157	if (dctx->co_key)
	158	EC_KEY_free(dctx->co_key);
	159	if (dctx->kdf_ukm)
	160	OPENSSL_free(dctx->kdf_ukm);
9ca7047d DSH	161	OPENSSL_free(dctx);
	162	}
	163	}
	164
eaff5a14 DSH	165	static int pkey_ec_sign(EVP_PKEY_CTX ctx, unsigned char sig, size_t *siglen,
eaff5a14 DSH	166	const unsigned char *tbs, size_t tbslen)
9ca7047d DSH	167	{
9ca7047d DSH	168	int ret, type;
786aa98d	169	unsigned int sltmp;
9ca7047d DSH	170	EC_PKEY_CTX *dctx = ctx->data;
	171	EC_KEY *ec = ctx->pkey->pkey.ec;
	172
	173	if (!sig)
	174	{
	175	*siglen = ECDSA_size(ec);
	176	return 1;
	177	}
eaff5a14	178	else if(*siglen < (size_t)ECDSA_size(ec))
9ca7047d DSH	179	{
	180	ECerr(EC_F_PKEY_EC_SIGN, EC_R_BUFFER_TOO_SMALL);
	181	return 0;
	182	}
	183
	184	if (dctx->md)
	185	type = EVP_MD_type(dctx->md);
	186	else
	187	type = NID_sha1;
	188
	189
	190	ret = ECDSA_sign(type, tbs, tbslen, sig, &sltmp, ec);
	191
fed8dbf4	192	if (ret <= 0)
9ca7047d	193	return ret;
786aa98d	194	*siglen = (size_t)sltmp;
9ca7047d DSH	195	return 1;
	196	}
	197
	198	static int pkey_ec_verify(EVP_PKEY_CTX *ctx,
eaff5a14 DSH	199	const unsigned char *sig, size_t siglen,
eaff5a14 DSH	200	const unsigned char *tbs, size_t tbslen)
9ca7047d DSH	201	{
	202	int ret, type;
	203	EC_PKEY_CTX *dctx = ctx->data;
	204	EC_KEY *ec = ctx->pkey->pkey.ec;
	205
	206	if (dctx->md)
	207	type = EVP_MD_type(dctx->md);
	208	else
	209	type = NID_sha1;
	210
	211	ret = ECDSA_verify(type, tbs, tbslen, sig, siglen, ec);
	212
	213	return ret;
	214	}
	215
eaff5a14	216	static int pkey_ec_derive(EVP_PKEY_CTX ctx, unsigned char key, size_t *keylen)
9ca7047d DSH	217	{
	218	int ret;
	219	size_t outlen;
	220	const EC_POINT *pubkey = NULL;
25af7a5d DSH	221	EC_KEY *eckey;
25af7a5d DSH	222	EC_PKEY_CTX *dctx = ctx->data;
9ca7047d DSH	223	if (!ctx->pkey \|\| !ctx->peerkey)
	224	{
	225	ECerr(EC_F_PKEY_EC_DERIVE, EC_R_KEYS_NOT_SET);
	226	return 0;
	227	}
	228
25af7a5d DSH	229	eckey = dctx->co_key ? dctx->co_key : ctx->pkey->pkey.ec;
25af7a5d DSH	230
9ca7047d DSH	231	if (!key)
	232	{
	233	const EC_GROUP *group;
25af7a5d	234	group = EC_KEY_get0_group(eckey);
9ca7047d DSH	235	*keylen = (EC_GROUP_get_degree(group) + 7)/8;
	236	return 1;
	237	}
9ca7047d DSH	238	pubkey = EC_KEY_get0_public_key(ctx->peerkey->pkey.ec);
9ca7047d DSH	239
713f4911	240	/* NB: unlike PKCS#3 DH, if *outlen is less than maximum size this is
9ca7047d DSH	241	* not an error, the result is truncated.
	242	*/
	243
	244	outlen = *keylen;
	245
25af7a5d	246	ret = ECDH_compute_key(key, outlen, pubkey, eckey, 0);
9ca7047d DSH	247	if (ret < 0)
	248	return ret;
	249	*keylen = ret;
	250	return 1;
	251	}
	252
25af7a5d DSH	253	static int pkey_ec_kdf_derive(EVP_PKEY_CTX *ctx,
	254	unsigned char key, size_t keylen)
	255	{
	256	EC_PKEY_CTX *dctx = ctx->data;
	257	unsigned char *ktmp = NULL;
	258	size_t ktmplen;
	259	int rv = 0;
	260	if (dctx->kdf_type == EVP_PKEY_ECDH_KDF_NONE)
	261	return pkey_ec_derive(ctx, key, keylen);
	262	if (!key)
	263	{
	264	*keylen = dctx->kdf_outlen;
	265	return 1;
	266	}
	267	if (*keylen != dctx->kdf_outlen)
	268	return 0;
	269	if (!pkey_ec_derive(ctx, NULL, &ktmplen))
	270	return 0;
	271	ktmp = OPENSSL_malloc(ktmplen);
	272	if (!ktmp)
	273	return 0;
	274	if (!pkey_ec_derive(ctx, ktmp, &ktmplen))
	275	goto err;
	276	/* Do KDF stuff */
	277	if (!ECDH_KDF_X9_62(key, *keylen, ktmp, ktmplen,
	278	dctx->kdf_ukm, dctx->kdf_ukmlen,
	279	dctx->kdf_md))
	280	goto err;
	281	rv = 1;
	282
	283	err:
	284	if (ktmp)
	285	{
	286	OPENSSL_cleanse(ktmp, ktmplen);
	287	OPENSSL_free(ktmp);
	288	}
	289	return rv;
	290	}
	291
9ca7047d DSH	292	static int pkey_ec_ctrl(EVP_PKEY_CTX ctx, int type, int p1, void p2)
	293	{
	294	EC_PKEY_CTX *dctx = ctx->data;
	295	EC_GROUP *group;
	296	switch (type)
	297	{
	298	case EVP_PKEY_CTRL_EC_PARAMGEN_CURVE_NID:
	299	group = EC_GROUP_new_by_curve_name(p1);
	300	if (group == NULL)
	301	{
	302	ECerr(EC_F_PKEY_EC_CTRL, EC_R_INVALID_CURVE);
	303	return 0;
	304	}
	305	if (dctx->gen_group)
	306	EC_GROUP_free(dctx->gen_group);
	307	dctx->gen_group = group;
	308	return 1;
	309
24edfa9d DSH	310	case EVP_PKEY_CTRL_EC_PARAM_ENC:
	311	if (!dctx->gen_group)
	312	{
	313	ECerr(EC_F_PKEY_EC_CTRL, EC_R_NO_PARAMETERS_SET);
	314	return 0;
	315	}
	316	EC_GROUP_set_asn1_flag(dctx->gen_group, p1);
	317	return 1;
	318
25af7a5d DSH	319	case EVP_PKEY_CTRL_EC_ECDH_COFACTOR:
	320	if (p1 == -2)
	321	{
	322	if (dctx->co_key)
	323	return dctx->cofactor_mode;
	324	else
	325	{
	326	EC_KEY *ec_key = ctx->pkey->pkey.ec;
	327	return EC_KEY_get_flags(ec_key) & EC_FLAG_COFACTOR_ECDH ? 1 : 0;
	328	}
	329	}
	330	else if (p1 < -1 \|\| p1 > 1)
	331	return -2;
	332	dctx->cofactor_mode = p1;
	333	if (p1 != -1)
	334	{
	335	EC_KEY *ec_key = ctx->pkey->pkey.ec;
	336	if (!ec_key->group)
	337	return -2;
	338	/* If cofactor is 1 cofactor mode does nothing */
	339	if (BN_is_one(&ec_key->group->cofactor))
	340	return 1;
	341	if (!dctx->co_key)
	342	{
	343	dctx->co_key = EC_KEY_dup(ec_key);
	344	if (!dctx->co_key)
	345	return 0;
	346	}
	347	if (p1)
	348	EC_KEY_set_flags(dctx->co_key,
	349	EC_FLAG_COFACTOR_ECDH);
	350	else
	351	EC_KEY_clear_flags(dctx->co_key,
	352	EC_FLAG_COFACTOR_ECDH);
	353	}
	354	else if (dctx->co_key)
	355	{
	356	EC_KEY_free(dctx->co_key);
	357	dctx->co_key = NULL;
	358	}
	359	return 1;
	360
	361	case EVP_PKEY_CTRL_EC_KDF_TYPE:
	362	if (p1 == -2)
	363	return dctx->kdf_type;
	364	if (p1 != EVP_PKEY_ECDH_KDF_NONE &&
	365	p1 != EVP_PKEY_ECDH_KDF_X9_62)
	366	return -2;
	367	dctx->kdf_type = p1;
	368	return 1;
	369
	370	case EVP_PKEY_CTRL_EC_KDF_MD:
	371	dctx->kdf_md = p2;
	372	return 1;
	373
	374	case EVP_PKEY_CTRL_GET_EC_KDF_MD:
	375	(const EVP_MD *)p2 = dctx->kdf_md;
	376	return 1;
	377
	378	case EVP_PKEY_CTRL_EC_KDF_OUTLEN:
	379	if (p1 <= 0)
	380	return -2;
	381	dctx->kdf_outlen = (size_t)p1;
	382	return 1;
383
384	case EVP_PKEY_CTRL_GET_EC_KDF_OUTLEN:
385	(int )p2 = dctx->kdf_outlen;
386	return 1;
387
388	case EVP_PKEY_CTRL_EC_KDF_UKM:
389	if (dctx->kdf_ukm)
390	OPENSSL_free(dctx->kdf_ukm);
391	dctx->kdf_ukm = p2;
392	if (p2)
393	dctx->kdf_ukmlen = p1;
394	else
395	dctx->kdf_ukmlen = 0;
396	return 1;
397
398	case EVP_PKEY_CTRL_GET_EC_KDF_UKM:
399	(unsigned char *)p2 = dctx->kdf_ukm;
400	return dctx->kdf_ukmlen;
401
9ca7047d	402	case EVP_PKEY_CTRL_MD:
06e2dd03	403	if (EVP_MD_type((const EVP_MD *)p2) != NID_sha1 &&
3699ec60	404	EVP_MD_type((const EVP_MD *)p2) != NID_ecdsa_with_SHA1 &&
06e2dd03 NL	405	EVP_MD_type((const EVP_MD *)p2) != NID_sha224 &&
	406	EVP_MD_type((const EVP_MD *)p2) != NID_sha256 &&
	407	EVP_MD_type((const EVP_MD *)p2) != NID_sha384 &&
	408	EVP_MD_type((const EVP_MD *)p2) != NID_sha512)
9ca7047d DSH	409	{
	410	ECerr(EC_F_PKEY_EC_CTRL, EC_R_INVALID_DIGEST_TYPE);
	411	return 0;
	412	}
	413	dctx->md = p2;
	414	return 1;
	415
81063953 DSH	416	case EVP_PKEY_CTRL_GET_MD:
	417	(const EVP_MD *)p2 = dctx->md;
	418	return 1;
	419
9ca7047d DSH	420	case EVP_PKEY_CTRL_PEER_KEY:
9ca7047d DSH	421	/* Default behaviour is OK */
156ee882	422	case EVP_PKEY_CTRL_DIGESTINIT:
b7683e3a	423	case EVP_PKEY_CTRL_PKCS7_SIGN:
8931b30d	424	case EVP_PKEY_CTRL_CMS_SIGN:
9ca7047d DSH	425	return 1;
	426
	427	default:
	428	return -2;
	429
	430	}
	431	}
	432
	433	static int pkey_ec_ctrl_str(EVP_PKEY_CTX *ctx,
	434	const char type, const char value)
	435	{
	436	if (!strcmp(type, "ec_paramgen_curve"))
	437	{
	438	int nid;
64095ce9 DSH	439	nid = EC_curve_nist2nid(value);
	440	if (nid == NID_undef)
	441	nid = OBJ_sn2nid(value);
9ca7047d DSH	442	if (nid == NID_undef)
	443	nid = OBJ_ln2nid(value);
	444	if (nid == NID_undef)
	445	{
	446	ECerr(EC_F_PKEY_EC_CTRL_STR, EC_R_INVALID_CURVE);
	447	return 0;
	448	}
	449	return EVP_PKEY_CTX_set_ec_paramgen_curve_nid(ctx, nid);
	450	}
24edfa9d DSH	451	else if (!strcmp(type, "ec_param_enc"))
	452	{
	453	int param_enc;
	454	if (!strcmp(value, "explicit"))
	455	param_enc = 0;
	456	else if (!strcmp(value, "named_curve"))
	457	param_enc = OPENSSL_EC_NAMED_CURVE;
	458	else
	459	return -2;
	460	return EVP_PKEY_CTX_set_ec_param_enc(ctx, param_enc);
	461	}
	462
9ca7047d DSH	463	return -2;
	464	}
	465
	466	static int pkey_ec_paramgen(EVP_PKEY_CTX ctx, EVP_PKEY pkey)
	467	{
	468	EC_KEY *ec = NULL;
	469	EC_PKEY_CTX *dctx = ctx->data;
	470	int ret = 0;
	471	if (dctx->gen_group == NULL)
	472	{
	473	ECerr(EC_F_PKEY_EC_PARAMGEN, EC_R_NO_PARAMETERS_SET);
	474	return 0;
	475	}
	476	ec = EC_KEY_new();
	477	if (!ec)
	478	return 0;
	479	ret = EC_KEY_set_group(ec, dctx->gen_group);
	480	if (ret)
	481	EVP_PKEY_assign_EC_KEY(pkey, ec);
	482	else
	483	EC_KEY_free(ec);
	484	return ret;
	485	}
	486
	487	static int pkey_ec_keygen(EVP_PKEY_CTX ctx, EVP_PKEY pkey)
	488	{
	489	EC_KEY *ec = NULL;
24edfa9d DSH	490	EC_PKEY_CTX *dctx = ctx->data;
24edfa9d DSH	491	if (ctx->pkey == NULL && dctx->gen_group == NULL)
9ca7047d DSH	492	{
	493	ECerr(EC_F_PKEY_EC_KEYGEN, EC_R_NO_PARAMETERS_SET);
	494	return 0;
	495	}
	496	ec = EC_KEY_new();
	497	if (!ec)
	498	return 0;
	499	EVP_PKEY_assign_EC_KEY(pkey, ec);
24edfa9d DSH	500	if (ctx->pkey)
	501	{
	502	/* Note: if error return, pkey is freed by parent routine */
	503	if (!EVP_PKEY_copy_parameters(pkey, ctx->pkey))
	504	return 0;
	505	}
	506	else
	507	{
	508	if (!EC_KEY_set_group(ec, dctx->gen_group))
	509	return 0;
	510	}
9ca7047d DSH	511	return EC_KEY_generate_key(pkey->pkey.ec);
	512	}
	513
	514	const EVP_PKEY_METHOD ec_pkey_meth =
	515	{
	516	EVP_PKEY_EC,
	517	0,
	518	pkey_ec_init,
8bdcef40	519	pkey_ec_copy,
9ca7047d DSH	520	pkey_ec_cleanup,
	521
	522	0,
	523	pkey_ec_paramgen,
	524
	525	0,
	526	pkey_ec_keygen,
	527
	528	0,
	529	pkey_ec_sign,
	530
	531	0,
	532	pkey_ec_verify,
	533
	534	0,0,
	535
	536	0,0,0,0,
	537
	538	0,0,
	539
	540	0,0,
	541
	542	0,
25af7a5d	543	pkey_ec_kdf_derive,
9ca7047d DSH	544
	545	pkey_ec_ctrl,
	546	pkey_ec_ctrl_str
	547
	548	};