[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 "internal/evp_int.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 */
    signed 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) {
        EC_GROUP_free(dctx->gen_group);
        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;
}

#ifndef OPENSSL_NO_EC
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 0;
    *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;
}
#endif

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;
        }
        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;

#ifndef OPENSSL_NO_EC
    case EVP_PKEY_CTRL_EC_ECDH_COFACTOR:
        if (p1 == -2) {
            if (dctx->cofactor_mode != -1)
                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 {
            EC_KEY_free(dctx->co_key);
            dctx->co_key = NULL;
        }
        return 1;
#endif

    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);
    } else if (!strcmp(type, "ecdh_kdf_md")) {
        const EVP_MD *md;
        if (!(md = EVP_get_digestbyname(value))) {
            ECerr(EC_F_PKEY_EC_CTRL_STR, EC_R_INVALID_DIGEST);
            return 0;
        }
        return EVP_PKEY_CTX_set_ecdh_kdf_md(ctx, md);
    } else if (!strcmp(type, "ecdh_cofactor_mode")) {
        int co_mode;
        co_mode = atoi(value);
        return EVP_PKEY_CTX_set_ecdh_cofactor_mode(ctx, co_mode);
    }

    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,
#ifndef OPENSSL_NO_EC
    pkey_ec_kdf_derive,
#else
    0,
#endif
    pkey_ec_ctrl,
    pkey_ec_ctrl_str
};
Commit	Line	Data
0f113f3e MC	1	/*
	2	* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
	3	* 2006.
9ca7047d DSH	4	*/
	5	/* ====================================================================
	6	* Copyright (c) 2006 The OpenSSL Project. All rights reserved.
	7	*
	8	* Redistribution and use in source and binary forms, with or without
	9	* modification, are permitted provided that the following conditions
	10	* are met:
	11	*
	12	* 1. Redistributions of source code must retain the above copyright
0f113f3e	13	* notice, this list of conditions and the following disclaimer.
9ca7047d DSH	14	*
	15	* 2. Redistributions in binary form must reproduce the above copyright
	16	* notice, this list of conditions and the following disclaimer in
	17	* the documentation and/or other materials provided with the
	18	* distribution.
	19	*
	20	* 3. All advertising materials mentioning features or use of this
	21	* software must display the following acknowledgment:
	22	* "This product includes software developed by the OpenSSL Project
	23	* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
	24	*
	25	* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
	26	* endorse or promote products derived from this software without
	27	* prior written permission. For written permission, please contact
	28	* licensing@OpenSSL.org.
	29	*
	30	* 5. Products derived from this software may not be called "OpenSSL"
	31	* nor may "OpenSSL" appear in their names without prior written
	32	* permission of the OpenSSL Project.
	33	*
	34	* 6. Redistributions of any form whatsoever must retain the following
	35	* acknowledgment:
	36	* "This product includes software developed by the OpenSSL Project
	37	* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
	38	*
	39	* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
	40	* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	41	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
	42	* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
	43	* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	44	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	45	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
	46	* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	47	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
	48	* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	49	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
	50	* OF THE POSSIBILITY OF SUCH DAMAGE.
	51	* ====================================================================
	52	*
	53	* This product includes cryptographic software written by Eric Young
	54	* (eay@cryptsoft.com). This product includes software written by Tim
	55	* Hudson (tjh@cryptsoft.com).
	56	*
	57	*/
	58
	59	#include <stdio.h>
	60	#include "cryptlib.h"
	61	#include <openssl/asn1t.h>
	62	#include <openssl/x509.h>
	63	#include <openssl/ec.h>
25af7a5d	64	#include "ec_lcl.h"
9ca7047d DSH	65	#include <openssl/ecdsa.h>
9ca7047d DSH	66	#include <openssl/evp.h>
27af42f9	67	#include "internal/evp_int.h"
9ca7047d DSH	68
	69	/* EC pkey context structure */
	70
0f113f3e MC	71	typedef struct {
	72	/* Key and paramgen group */
	73	EC_GROUP *gen_group;
	74	/* message digest */
	75	const EVP_MD *md;
	76	/* Duplicate key if custom cofactor needed */
	77	EC_KEY *co_key;
	78	/* Cofactor mode */
	79	signed 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	} EC_PKEY_CTX;
9ca7047d DSH	90
9ca7047d DSH	91	static int pkey_ec_init(EVP_PKEY_CTX *ctx)
0f113f3e MC	92	{
	93	EC_PKEY_CTX *dctx;
	94	dctx = OPENSSL_malloc(sizeof(EC_PKEY_CTX));
	95	if (!dctx)
	96	return 0;
	97	dctx->gen_group = NULL;
	98	dctx->md = NULL;
	99
	100	dctx->cofactor_mode = -1;
	101	dctx->co_key = NULL;
	102	dctx->kdf_type = EVP_PKEY_ECDH_KDF_NONE;
	103	dctx->kdf_md = NULL;
	104	dctx->kdf_outlen = 0;
	105	dctx->kdf_ukm = NULL;
	106	dctx->kdf_ukmlen = 0;
	107
	108	ctx->data = dctx;
	109
	110	return 1;
	111	}
9ca7047d	112
8bdcef40	113	static int pkey_ec_copy(EVP_PKEY_CTX dst, EVP_PKEY_CTX src)
0f113f3e MC	114	{
	115	EC_PKEY_CTX dctx, sctx;
	116	if (!pkey_ec_init(dst))
	117	return 0;
	118	sctx = src->data;
	119	dctx = dst->data;
	120	if (sctx->gen_group) {
	121	dctx->gen_group = EC_GROUP_dup(sctx->gen_group);
	122	if (!dctx->gen_group)
	123	return 0;
	124	}
	125	dctx->md = sctx->md;
	126
	127	if (sctx->co_key) {
	128	dctx->co_key = EC_KEY_dup(sctx->co_key);
	129	if (!dctx->co_key)
	130	return 0;
	131	}
	132	dctx->kdf_type = sctx->kdf_type;
	133	dctx->kdf_md = sctx->kdf_md;
	134	dctx->kdf_outlen = sctx->kdf_outlen;
	135	if (sctx->kdf_ukm) {
	136	dctx->kdf_ukm = BUF_memdup(sctx->kdf_ukm, sctx->kdf_ukmlen);
	137	if (!dctx->kdf_ukm)
	138	return 0;
	139	} else
	140	dctx->kdf_ukm = NULL;
	141	dctx->kdf_ukmlen = sctx->kdf_ukmlen;
	142	return 1;
	143	}
8bdcef40	144
9ca7047d	145	static void pkey_ec_cleanup(EVP_PKEY_CTX *ctx)
0f113f3e MC	146	{
	147	EC_PKEY_CTX *dctx = ctx->data;
	148	if (dctx) {
8fdc3734 RS	149	EC_GROUP_free(dctx->gen_group);
8fdc3734 RS	150	EC_KEY_free(dctx->co_key);
0f113f3e MC	151	if (dctx->kdf_ukm)
	152	OPENSSL_free(dctx->kdf_ukm);
	153	OPENSSL_free(dctx);
	154	}
	155	}
9ca7047d	156
eaff5a14	157	static int pkey_ec_sign(EVP_PKEY_CTX ctx, unsigned char sig, size_t *siglen,
0f113f3e MC	158	const unsigned char *tbs, size_t tbslen)
	159	{
	160	int ret, type;
	161	unsigned int sltmp;
	162	EC_PKEY_CTX *dctx = ctx->data;
	163	EC_KEY *ec = ctx->pkey->pkey.ec;
	164
	165	if (!sig) {
	166	*siglen = ECDSA_size(ec);
	167	return 1;
	168	} else if (*siglen < (size_t)ECDSA_size(ec)) {
	169	ECerr(EC_F_PKEY_EC_SIGN, EC_R_BUFFER_TOO_SMALL);
	170	return 0;
	171	}
	172
	173	if (dctx->md)
	174	type = EVP_MD_type(dctx->md);
	175	else
	176	type = NID_sha1;
	177
	178	ret = ECDSA_sign(type, tbs, tbslen, sig, &sltmp, ec);
	179
	180	if (ret <= 0)
	181	return ret;
	182	*siglen = (size_t)sltmp;
	183	return 1;
	184	}
9ca7047d DSH	185
9ca7047d DSH	186	static int pkey_ec_verify(EVP_PKEY_CTX *ctx,
0f113f3e MC	187	const unsigned char *sig, size_t siglen,
	188	const unsigned char *tbs, size_t tbslen)
	189	{
	190	int ret, type;
	191	EC_PKEY_CTX *dctx = ctx->data;
	192	EC_KEY *ec = ctx->pkey->pkey.ec;
9ca7047d	193
0f113f3e MC	194	if (dctx->md)
	195	type = EVP_MD_type(dctx->md);
	196	else
	197	type = NID_sha1;
9ca7047d	198
0f113f3e	199	ret = ECDSA_verify(type, tbs, tbslen, sig, siglen, ec);
9ca7047d	200
0f113f3e MC	201	return ret;
0f113f3e MC	202	}
9ca7047d	203
10bf4fc2	204	#ifndef OPENSSL_NO_EC
0f113f3e MC	205	static int pkey_ec_derive(EVP_PKEY_CTX ctx, unsigned char key,
	206	size_t *keylen)
	207	{
	208	int ret;
	209	size_t outlen;
	210	const EC_POINT *pubkey = NULL;
	211	EC_KEY *eckey;
	212	EC_PKEY_CTX *dctx = ctx->data;
	213	if (!ctx->pkey \|\| !ctx->peerkey) {
	214	ECerr(EC_F_PKEY_EC_DERIVE, EC_R_KEYS_NOT_SET);
	215	return 0;
	216	}
	217
	218	eckey = dctx->co_key ? dctx->co_key : ctx->pkey->pkey.ec;
	219
	220	if (!key) {
	221	const EC_GROUP *group;
	222	group = EC_KEY_get0_group(eckey);
	223	*keylen = (EC_GROUP_get_degree(group) + 7) / 8;
	224	return 1;
	225	}
	226	pubkey = EC_KEY_get0_public_key(ctx->peerkey->pkey.ec);
	227
	228	/*
	229	* NB: unlike PKCS#3 DH, if *outlen is less than maximum size this is not
	230	* an error, the result is truncated.
	231	*/
	232
	233	outlen = *keylen;
	234
	235	ret = ECDH_compute_key(key, outlen, pubkey, eckey, 0);
	236	if (ret <= 0)
	237	return 0;
	238	*keylen = ret;
	239	return 1;
	240	}
9ca7047d	241
25af7a5d	242	static int pkey_ec_kdf_derive(EVP_PKEY_CTX *ctx,
0f113f3e MC	243	unsigned char key, size_t keylen)
	244	{
	245	EC_PKEY_CTX *dctx = ctx->data;
	246	unsigned char *ktmp = NULL;
	247	size_t ktmplen;
	248	int rv = 0;
	249	if (dctx->kdf_type == EVP_PKEY_ECDH_KDF_NONE)
	250	return pkey_ec_derive(ctx, key, keylen);
	251	if (!key) {
	252	*keylen = dctx->kdf_outlen;
	253	return 1;
	254	}
	255	if (*keylen != dctx->kdf_outlen)
	256	return 0;
	257	if (!pkey_ec_derive(ctx, NULL, &ktmplen))
	258	return 0;
	259	ktmp = OPENSSL_malloc(ktmplen);
	260	if (!ktmp)
	261	return 0;
	262	if (!pkey_ec_derive(ctx, ktmp, &ktmplen))
	263	goto err;
	264	/* Do KDF stuff */
	265	if (!ECDH_KDF_X9_62(key, *keylen, ktmp, ktmplen,
	266	dctx->kdf_ukm, dctx->kdf_ukmlen, dctx->kdf_md))
	267	goto err;
	268	rv = 1;
	269
	270	err:
	271	if (ktmp) {
	272	OPENSSL_cleanse(ktmp, ktmplen);
	273	OPENSSL_free(ktmp);
	274	}
	275	return rv;
	276	}
af6e2d51	277	#endif
25af7a5d	278
9ca7047d	279	static int pkey_ec_ctrl(EVP_PKEY_CTX ctx, int type, int p1, void p2)
0f113f3e MC	280	{
	281	EC_PKEY_CTX *dctx = ctx->data;
	282	EC_GROUP *group;
	283	switch (type) {
	284	case EVP_PKEY_CTRL_EC_PARAMGEN_CURVE_NID:
	285	group = EC_GROUP_new_by_curve_name(p1);
	286	if (group == NULL) {
	287	ECerr(EC_F_PKEY_EC_CTRL, EC_R_INVALID_CURVE);
	288	return 0;
	289	}
8fdc3734	290	EC_GROUP_free(dctx->gen_group);
0f113f3e MC	291	dctx->gen_group = group;
	292	return 1;
	293
	294	case EVP_PKEY_CTRL_EC_PARAM_ENC:
	295	if (!dctx->gen_group) {
	296	ECerr(EC_F_PKEY_EC_CTRL, EC_R_NO_PARAMETERS_SET);
	297	return 0;
	298	}
	299	EC_GROUP_set_asn1_flag(dctx->gen_group, p1);
	300	return 1;
24edfa9d	301
10bf4fc2	302	#ifndef OPENSSL_NO_EC
0f113f3e MC	303	case EVP_PKEY_CTRL_EC_ECDH_COFACTOR:
	304	if (p1 == -2) {
	305	if (dctx->cofactor_mode != -1)
	306	return dctx->cofactor_mode;
	307	else {
	308	EC_KEY *ec_key = ctx->pkey->pkey.ec;
	309	return EC_KEY_get_flags(ec_key) & EC_FLAG_COFACTOR_ECDH ? 1 :
	310	0;
	311	}
	312	} else if (p1 < -1 \|\| p1 > 1)
	313	return -2;
	314	dctx->cofactor_mode = p1;
	315	if (p1 != -1) {
	316	EC_KEY *ec_key = ctx->pkey->pkey.ec;
	317	if (!ec_key->group)
	318	return -2;
	319	/* If cofactor is 1 cofactor mode does nothing */
	320	if (BN_is_one(ec_key->group->cofactor))
	321	return 1;
	322	if (!dctx->co_key) {
	323	dctx->co_key = EC_KEY_dup(ec_key);
	324	if (!dctx->co_key)
	325	return 0;
	326	}
	327	if (p1)
	328	EC_KEY_set_flags(dctx->co_key, EC_FLAG_COFACTOR_ECDH);
	329	else
	330	EC_KEY_clear_flags(dctx->co_key, EC_FLAG_COFACTOR_ECDH);
8fdc3734	331	} else {
0f113f3e MC	332	EC_KEY_free(dctx->co_key);
	333	dctx->co_key = NULL;
	334	}
	335	return 1;
af6e2d51	336	#endif
25af7a5d	337
0f113f3e MC	338	case EVP_PKEY_CTRL_EC_KDF_TYPE:
	339	if (p1 == -2)
	340	return dctx->kdf_type;
	341	if (p1 != EVP_PKEY_ECDH_KDF_NONE && p1 != EVP_PKEY_ECDH_KDF_X9_62)
	342	return -2;
	343	dctx->kdf_type = p1;
	344	return 1;
	345
	346	case EVP_PKEY_CTRL_EC_KDF_MD:
	347	dctx->kdf_md = p2;
	348	return 1;
	349
	350	case EVP_PKEY_CTRL_GET_EC_KDF_MD:
	351	(const EVP_MD *)p2 = dctx->kdf_md;
	352	return 1;
	353
	354	case EVP_PKEY_CTRL_EC_KDF_OUTLEN:
	355	if (p1 <= 0)
	356	return -2;
	357	dctx->kdf_outlen = (size_t)p1;
	358	return 1;
	359
	360	case EVP_PKEY_CTRL_GET_EC_KDF_OUTLEN:
	361	(int )p2 = dctx->kdf_outlen;
	362	return 1;
	363
	364	case EVP_PKEY_CTRL_EC_KDF_UKM:
	365	if (dctx->kdf_ukm)
	366	OPENSSL_free(dctx->kdf_ukm);
	367	dctx->kdf_ukm = p2;
	368	if (p2)
	369	dctx->kdf_ukmlen = p1;
	370	else
	371	dctx->kdf_ukmlen = 0;
	372	return 1;
	373
	374	case EVP_PKEY_CTRL_GET_EC_KDF_UKM:
	375	(unsigned char *)p2 = dctx->kdf_ukm;
	376	return dctx->kdf_ukmlen;
	377
	378	case EVP_PKEY_CTRL_MD:
	379	if (EVP_MD_type((const EVP_MD *)p2) != NID_sha1 &&
	380	EVP_MD_type((const EVP_MD *)p2) != NID_ecdsa_with_SHA1 &&
	381	EVP_MD_type((const EVP_MD *)p2) != NID_sha224 &&
	382	EVP_MD_type((const EVP_MD *)p2) != NID_sha256 &&
	383	EVP_MD_type((const EVP_MD *)p2) != NID_sha384 &&
	384	EVP_MD_type((const EVP_MD *)p2) != NID_sha512) {
	385	ECerr(EC_F_PKEY_EC_CTRL, EC_R_INVALID_DIGEST_TYPE);
	386	return 0;
	387	}
	388	dctx->md = p2;
	389	return 1;
	390
	391	case EVP_PKEY_CTRL_GET_MD:
	392	(const EVP_MD *)p2 = dctx->md;
	393	return 1;
	394
	395	case EVP_PKEY_CTRL_PEER_KEY:
	396	/* Default behaviour is OK */
	397	case EVP_PKEY_CTRL_DIGESTINIT:
	398	case EVP_PKEY_CTRL_PKCS7_SIGN:
	399	case EVP_PKEY_CTRL_CMS_SIGN:
	400	return 1;
	401
402	default:
403	return -2;
404
405	}
406	}
407
9ca7047d	408	static int pkey_ec_ctrl_str(EVP_PKEY_CTX *ctx,
0f113f3e MC	409	const char type, const char value)
	410	{
	411	if (!strcmp(type, "ec_paramgen_curve")) {
	412	int nid;
	413	nid = EC_curve_nist2nid(value);
	414	if (nid == NID_undef)
	415	nid = OBJ_sn2nid(value);
	416	if (nid == NID_undef)
	417	nid = OBJ_ln2nid(value);
	418	if (nid == NID_undef) {
	419	ECerr(EC_F_PKEY_EC_CTRL_STR, EC_R_INVALID_CURVE);
	420	return 0;
	421	}
	422	return EVP_PKEY_CTX_set_ec_paramgen_curve_nid(ctx, nid);
	423	} else if (!strcmp(type, "ec_param_enc")) {
	424	int param_enc;
	425	if (!strcmp(value, "explicit"))
	426	param_enc = 0;
	427	else if (!strcmp(value, "named_curve"))
	428	param_enc = OPENSSL_EC_NAMED_CURVE;
	429	else
	430	return -2;
	431	return EVP_PKEY_CTX_set_ec_param_enc(ctx, param_enc);
	432	} else if (!strcmp(type, "ecdh_kdf_md")) {
	433	const EVP_MD *md;
	434	if (!(md = EVP_get_digestbyname(value))) {
	435	ECerr(EC_F_PKEY_EC_CTRL_STR, EC_R_INVALID_DIGEST);
	436	return 0;
	437	}
	438	return EVP_PKEY_CTX_set_ecdh_kdf_md(ctx, md);
	439	} else if (!strcmp(type, "ecdh_cofactor_mode")) {
	440	int co_mode;
	441	co_mode = atoi(value);
	442	return EVP_PKEY_CTX_set_ecdh_cofactor_mode(ctx, co_mode);
	443	}
	444
	445	return -2;
	446	}
9ca7047d DSH	447
9ca7047d DSH	448	static int pkey_ec_paramgen(EVP_PKEY_CTX ctx, EVP_PKEY pkey)
0f113f3e MC	449	{
	450	EC_KEY *ec = NULL;
	451	EC_PKEY_CTX *dctx = ctx->data;
	452	int ret = 0;
	453	if (dctx->gen_group == NULL) {
	454	ECerr(EC_F_PKEY_EC_PARAMGEN, EC_R_NO_PARAMETERS_SET);
	455	return 0;
	456	}
	457	ec = EC_KEY_new();
	458	if (!ec)
	459	return 0;
	460	ret = EC_KEY_set_group(ec, dctx->gen_group);
	461	if (ret)
	462	EVP_PKEY_assign_EC_KEY(pkey, ec);
	463	else
	464	EC_KEY_free(ec);
	465	return ret;
	466	}
9ca7047d DSH	467
9ca7047d DSH	468	static int pkey_ec_keygen(EVP_PKEY_CTX ctx, EVP_PKEY pkey)
0f113f3e MC	469	{
	470	EC_KEY *ec = NULL;
	471	EC_PKEY_CTX *dctx = ctx->data;
	472	if (ctx->pkey == NULL && dctx->gen_group == NULL) {
	473	ECerr(EC_F_PKEY_EC_KEYGEN, EC_R_NO_PARAMETERS_SET);
	474	return 0;
	475	}
	476	ec = EC_KEY_new();
	477	if (!ec)
	478	return 0;
	479	EVP_PKEY_assign_EC_KEY(pkey, ec);
	480	if (ctx->pkey) {
	481	/* Note: if error return, pkey is freed by parent routine */
	482	if (!EVP_PKEY_copy_parameters(pkey, ctx->pkey))
	483	return 0;
	484	} else {
	485	if (!EC_KEY_set_group(ec, dctx->gen_group))
	486	return 0;
	487	}
	488	return EC_KEY_generate_key(pkey->pkey.ec);
	489	}
	490
	491	const EVP_PKEY_METHOD ec_pkey_meth = {
	492	EVP_PKEY_EC,
	493	0,
	494	pkey_ec_init,
	495	pkey_ec_copy,
	496	pkey_ec_cleanup,
	497
	498	0,
	499	pkey_ec_paramgen,
	500
	501	0,
	502	pkey_ec_keygen,
	503
	504	0,
	505	pkey_ec_sign,
	506
	507	0,
	508	pkey_ec_verify,
	509
	510	0, 0,
	511
	512	0, 0, 0, 0,
	513
	514	0, 0,
	515
	516	0, 0,
	517
	518	0,
10bf4fc2	519	#ifndef OPENSSL_NO_EC
0f113f3e	520	pkey_ec_kdf_derive,
af6e2d51	521	#else
0f113f3e	522	0,
af6e2d51	523	#endif
0f113f3e MC	524	pkey_ec_ctrl,
	525	pkey_ec_ctrl_str
	526	};