[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 "internal/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_zalloc(sizeof(*dctx));
    if (!dctx)
        return 0;

    dctx->cofactor_mode = -1;
    dctx->kdf_type = EVP_PKEY_ECDH_KDF_NONE;
    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);
        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:
    OPENSSL_clear_free(ktmp, ktmplen);
    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:
        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") == 0) {
        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") == 0) {
        int param_enc;
        if (strcmp(value, "explicit") == 0)
            param_enc = 0;
        else if (strcmp(value, "named_curve") == 0)
            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") == 0) {
        const EVP_MD *md;
        if ((md = EVP_get_digestbyname(value)) == NULL) {
            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") == 0) {
        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>
b39fc560	60	#include "internal/cryptlib.h"
9ca7047d DSH	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	{
0f113f3e MC	93	EC_PKEY_CTX *dctx;
b4faea50	94
64b25758	95	dctx = OPENSSL_zalloc(sizeof(*dctx));
0f113f3e MC	96	if (!dctx)
0f113f3e MC	97	return 0;
0f113f3e MC	98
0f113f3e MC	99	dctx->cofactor_mode = -1;
0f113f3e	100	dctx->kdf_type = EVP_PKEY_ECDH_KDF_NONE;
0f113f3e	101	ctx->data = dctx;
0f113f3e MC	102	return 1;
0f113f3e MC	103	}
9ca7047d	104
8bdcef40	105	static int pkey_ec_copy(EVP_PKEY_CTX dst, EVP_PKEY_CTX src)
0f113f3e MC	106	{
	107	EC_PKEY_CTX dctx, sctx;
	108	if (!pkey_ec_init(dst))
	109	return 0;
	110	sctx = src->data;
	111	dctx = dst->data;
	112	if (sctx->gen_group) {
	113	dctx->gen_group = EC_GROUP_dup(sctx->gen_group);
	114	if (!dctx->gen_group)
	115	return 0;
	116	}
	117	dctx->md = sctx->md;
	118
	119	if (sctx->co_key) {
	120	dctx->co_key = EC_KEY_dup(sctx->co_key);
	121	if (!dctx->co_key)
	122	return 0;
	123	}
	124	dctx->kdf_type = sctx->kdf_type;
	125	dctx->kdf_md = sctx->kdf_md;
	126	dctx->kdf_outlen = sctx->kdf_outlen;
	127	if (sctx->kdf_ukm) {
	128	dctx->kdf_ukm = BUF_memdup(sctx->kdf_ukm, sctx->kdf_ukmlen);
	129	if (!dctx->kdf_ukm)
	130	return 0;
	131	} else
	132	dctx->kdf_ukm = NULL;
	133	dctx->kdf_ukmlen = sctx->kdf_ukmlen;
	134	return 1;
	135	}
8bdcef40	136
9ca7047d	137	static void pkey_ec_cleanup(EVP_PKEY_CTX *ctx)
0f113f3e MC	138	{
	139	EC_PKEY_CTX *dctx = ctx->data;
	140	if (dctx) {
8fdc3734 RS	141	EC_GROUP_free(dctx->gen_group);
8fdc3734 RS	142	EC_KEY_free(dctx->co_key);
b548a1f1	143	OPENSSL_free(dctx->kdf_ukm);
0f113f3e MC	144	OPENSSL_free(dctx);
	145	}
	146	}
9ca7047d	147
eaff5a14	148	static int pkey_ec_sign(EVP_PKEY_CTX ctx, unsigned char sig, size_t *siglen,
0f113f3e MC	149	const unsigned char *tbs, size_t tbslen)
	150	{
	151	int ret, type;
	152	unsigned int sltmp;
	153	EC_PKEY_CTX *dctx = ctx->data;
	154	EC_KEY *ec = ctx->pkey->pkey.ec;
	155
	156	if (!sig) {
	157	*siglen = ECDSA_size(ec);
	158	return 1;
	159	} else if (*siglen < (size_t)ECDSA_size(ec)) {
	160	ECerr(EC_F_PKEY_EC_SIGN, EC_R_BUFFER_TOO_SMALL);
	161	return 0;
	162	}
	163
	164	if (dctx->md)
	165	type = EVP_MD_type(dctx->md);
	166	else
	167	type = NID_sha1;
	168
	169	ret = ECDSA_sign(type, tbs, tbslen, sig, &sltmp, ec);
	170
	171	if (ret <= 0)
	172	return ret;
	173	*siglen = (size_t)sltmp;
	174	return 1;
	175	}
9ca7047d DSH	176
9ca7047d DSH	177	static int pkey_ec_verify(EVP_PKEY_CTX *ctx,
0f113f3e MC	178	const unsigned char *sig, size_t siglen,
	179	const unsigned char *tbs, size_t tbslen)
	180	{
	181	int ret, type;
	182	EC_PKEY_CTX *dctx = ctx->data;
	183	EC_KEY *ec = ctx->pkey->pkey.ec;
9ca7047d	184
0f113f3e MC	185	if (dctx->md)
	186	type = EVP_MD_type(dctx->md);
	187	else
	188	type = NID_sha1;
9ca7047d	189
0f113f3e	190	ret = ECDSA_verify(type, tbs, tbslen, sig, siglen, ec);
9ca7047d	191
0f113f3e MC	192	return ret;
0f113f3e MC	193	}
9ca7047d	194
10bf4fc2	195	#ifndef OPENSSL_NO_EC
0f113f3e MC	196	static int pkey_ec_derive(EVP_PKEY_CTX ctx, unsigned char key,
	197	size_t *keylen)
	198	{
	199	int ret;
	200	size_t outlen;
	201	const EC_POINT *pubkey = NULL;
	202	EC_KEY *eckey;
	203	EC_PKEY_CTX *dctx = ctx->data;
	204	if (!ctx->pkey \|\| !ctx->peerkey) {
	205	ECerr(EC_F_PKEY_EC_DERIVE, EC_R_KEYS_NOT_SET);
	206	return 0;
	207	}
	208
	209	eckey = dctx->co_key ? dctx->co_key : ctx->pkey->pkey.ec;
	210
	211	if (!key) {
	212	const EC_GROUP *group;
	213	group = EC_KEY_get0_group(eckey);
	214	*keylen = (EC_GROUP_get_degree(group) + 7) / 8;
	215	return 1;
	216	}
	217	pubkey = EC_KEY_get0_public_key(ctx->peerkey->pkey.ec);
	218
	219	/*
	220	* NB: unlike PKCS#3 DH, if *outlen is less than maximum size this is not
	221	* an error, the result is truncated.
	222	*/
	223
	224	outlen = *keylen;
	225
	226	ret = ECDH_compute_key(key, outlen, pubkey, eckey, 0);
	227	if (ret <= 0)
	228	return 0;
	229	*keylen = ret;
	230	return 1;
	231	}
9ca7047d	232
25af7a5d	233	static int pkey_ec_kdf_derive(EVP_PKEY_CTX *ctx,
0f113f3e MC	234	unsigned char key, size_t keylen)
	235	{
	236	EC_PKEY_CTX *dctx = ctx->data;
	237	unsigned char *ktmp = NULL;
	238	size_t ktmplen;
	239	int rv = 0;
	240	if (dctx->kdf_type == EVP_PKEY_ECDH_KDF_NONE)
	241	return pkey_ec_derive(ctx, key, keylen);
	242	if (!key) {
	243	*keylen = dctx->kdf_outlen;
	244	return 1;
	245	}
	246	if (*keylen != dctx->kdf_outlen)
	247	return 0;
	248	if (!pkey_ec_derive(ctx, NULL, &ktmplen))
	249	return 0;
	250	ktmp = OPENSSL_malloc(ktmplen);
	251	if (!ktmp)
	252	return 0;
	253	if (!pkey_ec_derive(ctx, ktmp, &ktmplen))
	254	goto err;
	255	/* Do KDF stuff */
	256	if (!ECDH_KDF_X9_62(key, *keylen, ktmp, ktmplen,
	257	dctx->kdf_ukm, dctx->kdf_ukmlen, dctx->kdf_md))
	258	goto err;
	259	rv = 1;
	260
	261	err:
4b45c6e5	262	OPENSSL_clear_free(ktmp, ktmplen);
0f113f3e MC	263	return rv;
0f113f3e MC	264	}
af6e2d51	265	#endif
25af7a5d	266
9ca7047d	267	static int pkey_ec_ctrl(EVP_PKEY_CTX ctx, int type, int p1, void p2)
0f113f3e MC	268	{
	269	EC_PKEY_CTX *dctx = ctx->data;
	270	EC_GROUP *group;
	271	switch (type) {
	272	case EVP_PKEY_CTRL_EC_PARAMGEN_CURVE_NID:
	273	group = EC_GROUP_new_by_curve_name(p1);
	274	if (group == NULL) {
	275	ECerr(EC_F_PKEY_EC_CTRL, EC_R_INVALID_CURVE);
	276	return 0;
	277	}
8fdc3734	278	EC_GROUP_free(dctx->gen_group);
0f113f3e MC	279	dctx->gen_group = group;
	280	return 1;
	281
	282	case EVP_PKEY_CTRL_EC_PARAM_ENC:
	283	if (!dctx->gen_group) {
	284	ECerr(EC_F_PKEY_EC_CTRL, EC_R_NO_PARAMETERS_SET);
	285	return 0;
	286	}
	287	EC_GROUP_set_asn1_flag(dctx->gen_group, p1);
	288	return 1;
24edfa9d	289
10bf4fc2	290	#ifndef OPENSSL_NO_EC
0f113f3e MC	291	case EVP_PKEY_CTRL_EC_ECDH_COFACTOR:
	292	if (p1 == -2) {
	293	if (dctx->cofactor_mode != -1)
	294	return dctx->cofactor_mode;
	295	else {
	296	EC_KEY *ec_key = ctx->pkey->pkey.ec;
	297	return EC_KEY_get_flags(ec_key) & EC_FLAG_COFACTOR_ECDH ? 1 :
	298	0;
	299	}
	300	} else if (p1 < -1 \|\| p1 > 1)
	301	return -2;
	302	dctx->cofactor_mode = p1;
	303	if (p1 != -1) {
	304	EC_KEY *ec_key = ctx->pkey->pkey.ec;
	305	if (!ec_key->group)
	306	return -2;
	307	/* If cofactor is 1 cofactor mode does nothing */
	308	if (BN_is_one(ec_key->group->cofactor))
	309	return 1;
	310	if (!dctx->co_key) {
	311	dctx->co_key = EC_KEY_dup(ec_key);
	312	if (!dctx->co_key)
	313	return 0;
	314	}
	315	if (p1)
	316	EC_KEY_set_flags(dctx->co_key, EC_FLAG_COFACTOR_ECDH);
	317	else
	318	EC_KEY_clear_flags(dctx->co_key, EC_FLAG_COFACTOR_ECDH);
8fdc3734	319	} else {
0f113f3e MC	320	EC_KEY_free(dctx->co_key);
	321	dctx->co_key = NULL;
	322	}
	323	return 1;
af6e2d51	324	#endif
25af7a5d	325
0f113f3e MC	326	case EVP_PKEY_CTRL_EC_KDF_TYPE:
	327	if (p1 == -2)
	328	return dctx->kdf_type;
	329	if (p1 != EVP_PKEY_ECDH_KDF_NONE && p1 != EVP_PKEY_ECDH_KDF_X9_62)
	330	return -2;
	331	dctx->kdf_type = p1;
	332	return 1;
	333
	334	case EVP_PKEY_CTRL_EC_KDF_MD:
	335	dctx->kdf_md = p2;
	336	return 1;
	337
	338	case EVP_PKEY_CTRL_GET_EC_KDF_MD:
	339	(const EVP_MD *)p2 = dctx->kdf_md;
	340	return 1;
	341
	342	case EVP_PKEY_CTRL_EC_KDF_OUTLEN:
	343	if (p1 <= 0)
	344	return -2;
	345	dctx->kdf_outlen = (size_t)p1;
	346	return 1;
	347
	348	case EVP_PKEY_CTRL_GET_EC_KDF_OUTLEN:
	349	(int )p2 = dctx->kdf_outlen;
	350	return 1;
	351
	352	case EVP_PKEY_CTRL_EC_KDF_UKM:
b548a1f1	353	OPENSSL_free(dctx->kdf_ukm);
0f113f3e MC	354	dctx->kdf_ukm = p2;
	355	if (p2)
	356	dctx->kdf_ukmlen = p1;
	357	else
	358	dctx->kdf_ukmlen = 0;
	359	return 1;
	360
	361	case EVP_PKEY_CTRL_GET_EC_KDF_UKM:
	362	(unsigned char *)p2 = dctx->kdf_ukm;
	363	return dctx->kdf_ukmlen;
	364
	365	case EVP_PKEY_CTRL_MD:
	366	if (EVP_MD_type((const EVP_MD *)p2) != NID_sha1 &&
	367	EVP_MD_type((const EVP_MD *)p2) != NID_ecdsa_with_SHA1 &&
	368	EVP_MD_type((const EVP_MD *)p2) != NID_sha224 &&
	369	EVP_MD_type((const EVP_MD *)p2) != NID_sha256 &&
	370	EVP_MD_type((const EVP_MD *)p2) != NID_sha384 &&
	371	EVP_MD_type((const EVP_MD *)p2) != NID_sha512) {
	372	ECerr(EC_F_PKEY_EC_CTRL, EC_R_INVALID_DIGEST_TYPE);
	373	return 0;
	374	}
	375	dctx->md = p2;
	376	return 1;
	377
	378	case EVP_PKEY_CTRL_GET_MD:
	379	(const EVP_MD *)p2 = dctx->md;
	380	return 1;
	381
	382	case EVP_PKEY_CTRL_PEER_KEY:
	383	/* Default behaviour is OK */
	384	case EVP_PKEY_CTRL_DIGESTINIT:
	385	case EVP_PKEY_CTRL_PKCS7_SIGN:
	386	case EVP_PKEY_CTRL_CMS_SIGN:
	387	return 1;
	388
	389	default:
	390	return -2;
	391
	392	}
	393	}
	394
9ca7047d	395	static int pkey_ec_ctrl_str(EVP_PKEY_CTX *ctx,
0f113f3e MC	396	const char type, const char value)
0f113f3e MC	397	{
86885c28	398	if (strcmp(type, "ec_paramgen_curve") == 0) {
0f113f3e MC	399	int nid;
	400	nid = EC_curve_nist2nid(value);
	401	if (nid == NID_undef)
	402	nid = OBJ_sn2nid(value);
	403	if (nid == NID_undef)
	404	nid = OBJ_ln2nid(value);
	405	if (nid == NID_undef) {
	406	ECerr(EC_F_PKEY_EC_CTRL_STR, EC_R_INVALID_CURVE);
	407	return 0;
	408	}
	409	return EVP_PKEY_CTX_set_ec_paramgen_curve_nid(ctx, nid);
86885c28	410	} else if (strcmp(type, "ec_param_enc") == 0) {
0f113f3e	411	int param_enc;
86885c28	412	if (strcmp(value, "explicit") == 0)
0f113f3e	413	param_enc = 0;
86885c28	414	else if (strcmp(value, "named_curve") == 0)
0f113f3e MC	415	param_enc = OPENSSL_EC_NAMED_CURVE;
	416	else
	417	return -2;
	418	return EVP_PKEY_CTX_set_ec_param_enc(ctx, param_enc);
86885c28	419	} else if (strcmp(type, "ecdh_kdf_md") == 0) {
0f113f3e	420	const EVP_MD *md;
75ebbd9a	421	if ((md = EVP_get_digestbyname(value)) == NULL) {
0f113f3e MC	422	ECerr(EC_F_PKEY_EC_CTRL_STR, EC_R_INVALID_DIGEST);
	423	return 0;
	424	}
	425	return EVP_PKEY_CTX_set_ecdh_kdf_md(ctx, md);
86885c28	426	} else if (strcmp(type, "ecdh_cofactor_mode") == 0) {
0f113f3e MC	427	int co_mode;
	428	co_mode = atoi(value);
	429	return EVP_PKEY_CTX_set_ecdh_cofactor_mode(ctx, co_mode);
	430	}
	431
	432	return -2;
	433	}
9ca7047d DSH	434
9ca7047d DSH	435	static int pkey_ec_paramgen(EVP_PKEY_CTX ctx, EVP_PKEY pkey)
0f113f3e MC	436	{
	437	EC_KEY *ec = NULL;
	438	EC_PKEY_CTX *dctx = ctx->data;
	439	int ret = 0;
	440	if (dctx->gen_group == NULL) {
	441	ECerr(EC_F_PKEY_EC_PARAMGEN, EC_R_NO_PARAMETERS_SET);
	442	return 0;
	443	}
	444	ec = EC_KEY_new();
	445	if (!ec)
	446	return 0;
	447	ret = EC_KEY_set_group(ec, dctx->gen_group);
	448	if (ret)
	449	EVP_PKEY_assign_EC_KEY(pkey, ec);
	450	else
	451	EC_KEY_free(ec);
	452	return ret;
	453	}
9ca7047d DSH	454
9ca7047d DSH	455	static int pkey_ec_keygen(EVP_PKEY_CTX ctx, EVP_PKEY pkey)
0f113f3e MC	456	{
	457	EC_KEY *ec = NULL;
	458	EC_PKEY_CTX *dctx = ctx->data;
	459	if (ctx->pkey == NULL && dctx->gen_group == NULL) {
	460	ECerr(EC_F_PKEY_EC_KEYGEN, EC_R_NO_PARAMETERS_SET);
	461	return 0;
	462	}
	463	ec = EC_KEY_new();
	464	if (!ec)
	465	return 0;
	466	EVP_PKEY_assign_EC_KEY(pkey, ec);
	467	if (ctx->pkey) {
	468	/* Note: if error return, pkey is freed by parent routine */
	469	if (!EVP_PKEY_copy_parameters(pkey, ctx->pkey))
	470	return 0;
	471	} else {
	472	if (!EC_KEY_set_group(ec, dctx->gen_group))
	473	return 0;
	474	}
	475	return EC_KEY_generate_key(pkey->pkey.ec);
	476	}
	477
	478	const EVP_PKEY_METHOD ec_pkey_meth = {
	479	EVP_PKEY_EC,
	480	0,
	481	pkey_ec_init,
	482	pkey_ec_copy,
	483	pkey_ec_cleanup,
	484
	485	0,
	486	pkey_ec_paramgen,
	487
	488	0,
	489	pkey_ec_keygen,
	490
	491	0,
	492	pkey_ec_sign,
	493
	494	0,
	495	pkey_ec_verify,
	496
	497	0, 0,
	498
	499	0, 0, 0, 0,
	500
	501	0, 0,
	502
	503	0, 0,
	504
	505	0,
10bf4fc2	506	#ifndef OPENSSL_NO_EC
0f113f3e	507	pkey_ec_kdf_derive,
af6e2d51	508	#else
0f113f3e	509	0,
af6e2d51	510	#endif
0f113f3e MC	511	pkey_ec_ctrl,
	512	pkey_ec_ctrl_str
	513	};