[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/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 == NULL)
        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 = OPENSSL_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 == NULL)
        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 == NULL)
        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	65	#include <openssl/evp.h>
27af42f9	66	#include "internal/evp_int.h"
9ca7047d DSH	67
	68	/* EC pkey context structure */
	69
0f113f3e MC	70	typedef struct {
	71	/* Key and paramgen group */
	72	EC_GROUP *gen_group;
	73	/* message digest */
	74	const EVP_MD *md;
	75	/* Duplicate key if custom cofactor needed */
	76	EC_KEY *co_key;
	77	/* Cofactor mode */
	78	signed char cofactor_mode;
	79	/* KDF (if any) to use for ECDH */
	80	char kdf_type;
	81	/* Message digest to use for key derivation */
	82	const EVP_MD *kdf_md;
	83	/* User key material */
	84	unsigned char *kdf_ukm;
	85	size_t kdf_ukmlen;
	86	/* KDF output length */
	87	size_t kdf_outlen;
	88	} EC_PKEY_CTX;
9ca7047d DSH	89
9ca7047d DSH	90	static int pkey_ec_init(EVP_PKEY_CTX *ctx)
0f113f3e MC	91	{
0f113f3e MC	92	EC_PKEY_CTX *dctx;
b4faea50	93
64b25758	94	dctx = OPENSSL_zalloc(sizeof(*dctx));
90945fa3	95	if (dctx == NULL)
0f113f3e	96	return 0;
0f113f3e MC	97
0f113f3e MC	98	dctx->cofactor_mode = -1;
0f113f3e	99	dctx->kdf_type = EVP_PKEY_ECDH_KDF_NONE;
0f113f3e	100	ctx->data = dctx;
0f113f3e MC	101	return 1;
0f113f3e MC	102	}
9ca7047d	103
8bdcef40	104	static int pkey_ec_copy(EVP_PKEY_CTX dst, EVP_PKEY_CTX src)
0f113f3e MC	105	{
	106	EC_PKEY_CTX dctx, sctx;
	107	if (!pkey_ec_init(dst))
	108	return 0;
	109	sctx = src->data;
	110	dctx = dst->data;
	111	if (sctx->gen_group) {
	112	dctx->gen_group = EC_GROUP_dup(sctx->gen_group);
	113	if (!dctx->gen_group)
	114	return 0;
	115	}
	116	dctx->md = sctx->md;
	117
	118	if (sctx->co_key) {
	119	dctx->co_key = EC_KEY_dup(sctx->co_key);
	120	if (!dctx->co_key)
	121	return 0;
	122	}
	123	dctx->kdf_type = sctx->kdf_type;
	124	dctx->kdf_md = sctx->kdf_md;
	125	dctx->kdf_outlen = sctx->kdf_outlen;
	126	if (sctx->kdf_ukm) {
7644a9ae	127	dctx->kdf_ukm = OPENSSL_memdup(sctx->kdf_ukm, sctx->kdf_ukmlen);
0f113f3e MC	128	if (!dctx->kdf_ukm)
	129	return 0;
	130	} else
	131	dctx->kdf_ukm = NULL;
	132	dctx->kdf_ukmlen = sctx->kdf_ukmlen;
	133	return 1;
	134	}
8bdcef40	135
9ca7047d	136	static void pkey_ec_cleanup(EVP_PKEY_CTX *ctx)
0f113f3e MC	137	{
	138	EC_PKEY_CTX *dctx = ctx->data;
	139	if (dctx) {
8fdc3734 RS	140	EC_GROUP_free(dctx->gen_group);
8fdc3734 RS	141	EC_KEY_free(dctx->co_key);
b548a1f1	142	OPENSSL_free(dctx->kdf_ukm);
0f113f3e MC	143	OPENSSL_free(dctx);
	144	}
	145	}
9ca7047d	146
eaff5a14	147	static int pkey_ec_sign(EVP_PKEY_CTX ctx, unsigned char sig, size_t *siglen,
0f113f3e MC	148	const unsigned char *tbs, size_t tbslen)
	149	{
	150	int ret, type;
	151	unsigned int sltmp;
	152	EC_PKEY_CTX *dctx = ctx->data;
	153	EC_KEY *ec = ctx->pkey->pkey.ec;
	154
	155	if (!sig) {
	156	*siglen = ECDSA_size(ec);
	157	return 1;
	158	} else if (*siglen < (size_t)ECDSA_size(ec)) {
	159	ECerr(EC_F_PKEY_EC_SIGN, EC_R_BUFFER_TOO_SMALL);
	160	return 0;
	161	}
	162
	163	if (dctx->md)
	164	type = EVP_MD_type(dctx->md);
	165	else
	166	type = NID_sha1;
	167
	168	ret = ECDSA_sign(type, tbs, tbslen, sig, &sltmp, ec);
	169
	170	if (ret <= 0)
	171	return ret;
	172	*siglen = (size_t)sltmp;
	173	return 1;
	174	}
9ca7047d DSH	175
9ca7047d DSH	176	static int pkey_ec_verify(EVP_PKEY_CTX *ctx,
0f113f3e MC	177	const unsigned char *sig, size_t siglen,
	178	const unsigned char *tbs, size_t tbslen)
	179	{
	180	int ret, type;
	181	EC_PKEY_CTX *dctx = ctx->data;
	182	EC_KEY *ec = ctx->pkey->pkey.ec;
9ca7047d	183
0f113f3e MC	184	if (dctx->md)
	185	type = EVP_MD_type(dctx->md);
	186	else
	187	type = NID_sha1;
9ca7047d	188
0f113f3e	189	ret = ECDSA_verify(type, tbs, tbslen, sig, siglen, ec);
9ca7047d	190
0f113f3e MC	191	return ret;
0f113f3e MC	192	}
9ca7047d	193
10bf4fc2	194	#ifndef OPENSSL_NO_EC
0f113f3e MC	195	static int pkey_ec_derive(EVP_PKEY_CTX ctx, unsigned char key,
	196	size_t *keylen)
	197	{
	198	int ret;
	199	size_t outlen;
	200	const EC_POINT *pubkey = NULL;
	201	EC_KEY *eckey;
	202	EC_PKEY_CTX *dctx = ctx->data;
	203	if (!ctx->pkey \|\| !ctx->peerkey) {
	204	ECerr(EC_F_PKEY_EC_DERIVE, EC_R_KEYS_NOT_SET);
	205	return 0;
	206	}
	207
	208	eckey = dctx->co_key ? dctx->co_key : ctx->pkey->pkey.ec;
	209
	210	if (!key) {
	211	const EC_GROUP *group;
	212	group = EC_KEY_get0_group(eckey);
	213	*keylen = (EC_GROUP_get_degree(group) + 7) / 8;
	214	return 1;
	215	}
	216	pubkey = EC_KEY_get0_public_key(ctx->peerkey->pkey.ec);
	217
	218	/*
	219	* NB: unlike PKCS#3 DH, if *outlen is less than maximum size this is not
	220	* an error, the result is truncated.
	221	*/
	222
	223	outlen = *keylen;
	224
	225	ret = ECDH_compute_key(key, outlen, pubkey, eckey, 0);
	226	if (ret <= 0)
	227	return 0;
	228	*keylen = ret;
	229	return 1;
	230	}
9ca7047d	231
25af7a5d	232	static int pkey_ec_kdf_derive(EVP_PKEY_CTX *ctx,
0f113f3e MC	233	unsigned char key, size_t keylen)
	234	{
	235	EC_PKEY_CTX *dctx = ctx->data;
	236	unsigned char *ktmp = NULL;
	237	size_t ktmplen;
	238	int rv = 0;
	239	if (dctx->kdf_type == EVP_PKEY_ECDH_KDF_NONE)
	240	return pkey_ec_derive(ctx, key, keylen);
	241	if (!key) {
	242	*keylen = dctx->kdf_outlen;
	243	return 1;
	244	}
	245	if (*keylen != dctx->kdf_outlen)
	246	return 0;
	247	if (!pkey_ec_derive(ctx, NULL, &ktmplen))
	248	return 0;
	249	ktmp = OPENSSL_malloc(ktmplen);
90945fa3	250	if (ktmp == NULL)
0f113f3e MC	251	return 0;
	252	if (!pkey_ec_derive(ctx, ktmp, &ktmplen))
	253	goto err;
	254	/* Do KDF stuff */
	255	if (!ECDH_KDF_X9_62(key, *keylen, ktmp, ktmplen,
	256	dctx->kdf_ukm, dctx->kdf_ukmlen, dctx->kdf_md))
	257	goto err;
	258	rv = 1;
	259
	260	err:
4b45c6e5	261	OPENSSL_clear_free(ktmp, ktmplen);
0f113f3e MC	262	return rv;
0f113f3e MC	263	}
af6e2d51	264	#endif
25af7a5d	265
9ca7047d	266	static int pkey_ec_ctrl(EVP_PKEY_CTX ctx, int type, int p1, void p2)
0f113f3e MC	267	{
	268	EC_PKEY_CTX *dctx = ctx->data;
	269	EC_GROUP *group;
	270	switch (type) {
	271	case EVP_PKEY_CTRL_EC_PARAMGEN_CURVE_NID:
	272	group = EC_GROUP_new_by_curve_name(p1);
	273	if (group == NULL) {
	274	ECerr(EC_F_PKEY_EC_CTRL, EC_R_INVALID_CURVE);
	275	return 0;
	276	}
8fdc3734	277	EC_GROUP_free(dctx->gen_group);
0f113f3e MC	278	dctx->gen_group = group;
	279	return 1;
	280
	281	case EVP_PKEY_CTRL_EC_PARAM_ENC:
	282	if (!dctx->gen_group) {
	283	ECerr(EC_F_PKEY_EC_CTRL, EC_R_NO_PARAMETERS_SET);
	284	return 0;
	285	}
	286	EC_GROUP_set_asn1_flag(dctx->gen_group, p1);
	287	return 1;
24edfa9d	288
10bf4fc2	289	#ifndef OPENSSL_NO_EC
0f113f3e MC	290	case EVP_PKEY_CTRL_EC_ECDH_COFACTOR:
	291	if (p1 == -2) {
	292	if (dctx->cofactor_mode != -1)
	293	return dctx->cofactor_mode;
	294	else {
	295	EC_KEY *ec_key = ctx->pkey->pkey.ec;
	296	return EC_KEY_get_flags(ec_key) & EC_FLAG_COFACTOR_ECDH ? 1 :
	297	0;
	298	}
	299	} else if (p1 < -1 \|\| p1 > 1)
	300	return -2;
	301	dctx->cofactor_mode = p1;
	302	if (p1 != -1) {
	303	EC_KEY *ec_key = ctx->pkey->pkey.ec;
	304	if (!ec_key->group)
	305	return -2;
	306	/* If cofactor is 1 cofactor mode does nothing */
	307	if (BN_is_one(ec_key->group->cofactor))
	308	return 1;
	309	if (!dctx->co_key) {
	310	dctx->co_key = EC_KEY_dup(ec_key);
	311	if (!dctx->co_key)
	312	return 0;
	313	}
	314	if (p1)
	315	EC_KEY_set_flags(dctx->co_key, EC_FLAG_COFACTOR_ECDH);
	316	else
	317	EC_KEY_clear_flags(dctx->co_key, EC_FLAG_COFACTOR_ECDH);
8fdc3734	318	} else {
0f113f3e MC	319	EC_KEY_free(dctx->co_key);
	320	dctx->co_key = NULL;
	321	}
	322	return 1;
af6e2d51	323	#endif
25af7a5d	324
0f113f3e MC	325	case EVP_PKEY_CTRL_EC_KDF_TYPE:
	326	if (p1 == -2)
	327	return dctx->kdf_type;
	328	if (p1 != EVP_PKEY_ECDH_KDF_NONE && p1 != EVP_PKEY_ECDH_KDF_X9_62)
	329	return -2;
	330	dctx->kdf_type = p1;
	331	return 1;
	332
	333	case EVP_PKEY_CTRL_EC_KDF_MD:
	334	dctx->kdf_md = p2;
	335	return 1;
	336
	337	case EVP_PKEY_CTRL_GET_EC_KDF_MD:
	338	(const EVP_MD *)p2 = dctx->kdf_md;
	339	return 1;
	340
	341	case EVP_PKEY_CTRL_EC_KDF_OUTLEN:
	342	if (p1 <= 0)
	343	return -2;
	344	dctx->kdf_outlen = (size_t)p1;
	345	return 1;
	346
	347	case EVP_PKEY_CTRL_GET_EC_KDF_OUTLEN:
	348	(int )p2 = dctx->kdf_outlen;
	349	return 1;
	350
	351	case EVP_PKEY_CTRL_EC_KDF_UKM:
b548a1f1	352	OPENSSL_free(dctx->kdf_ukm);
0f113f3e MC	353	dctx->kdf_ukm = p2;
	354	if (p2)
	355	dctx->kdf_ukmlen = p1;
	356	else
	357	dctx->kdf_ukmlen = 0;
	358	return 1;
	359
	360	case EVP_PKEY_CTRL_GET_EC_KDF_UKM:
	361	(unsigned char *)p2 = dctx->kdf_ukm;
	362	return dctx->kdf_ukmlen;
	363
	364	case EVP_PKEY_CTRL_MD:
	365	if (EVP_MD_type((const EVP_MD *)p2) != NID_sha1 &&
	366	EVP_MD_type((const EVP_MD *)p2) != NID_ecdsa_with_SHA1 &&
	367	EVP_MD_type((const EVP_MD *)p2) != NID_sha224 &&
	368	EVP_MD_type((const EVP_MD *)p2) != NID_sha256 &&
	369	EVP_MD_type((const EVP_MD *)p2) != NID_sha384 &&
	370	EVP_MD_type((const EVP_MD *)p2) != NID_sha512) {
	371	ECerr(EC_F_PKEY_EC_CTRL, EC_R_INVALID_DIGEST_TYPE);
	372	return 0;
	373	}
	374	dctx->md = p2;
	375	return 1;
	376
	377	case EVP_PKEY_CTRL_GET_MD:
	378	(const EVP_MD *)p2 = dctx->md;
	379	return 1;
	380
	381	case EVP_PKEY_CTRL_PEER_KEY:
	382	/* Default behaviour is OK */
	383	case EVP_PKEY_CTRL_DIGESTINIT:
	384	case EVP_PKEY_CTRL_PKCS7_SIGN:
	385	case EVP_PKEY_CTRL_CMS_SIGN:
	386	return 1;
	387
	388	default:
	389	return -2;
	390
	391	}
	392	}
	393
9ca7047d	394	static int pkey_ec_ctrl_str(EVP_PKEY_CTX *ctx,
0f113f3e MC	395	const char type, const char value)
0f113f3e MC	396	{
86885c28	397	if (strcmp(type, "ec_paramgen_curve") == 0) {
0f113f3e MC	398	int nid;
	399	nid = EC_curve_nist2nid(value);
	400	if (nid == NID_undef)
	401	nid = OBJ_sn2nid(value);
	402	if (nid == NID_undef)
	403	nid = OBJ_ln2nid(value);
	404	if (nid == NID_undef) {
	405	ECerr(EC_F_PKEY_EC_CTRL_STR, EC_R_INVALID_CURVE);
	406	return 0;
	407	}
	408	return EVP_PKEY_CTX_set_ec_paramgen_curve_nid(ctx, nid);
86885c28	409	} else if (strcmp(type, "ec_param_enc") == 0) {
0f113f3e	410	int param_enc;
86885c28	411	if (strcmp(value, "explicit") == 0)
0f113f3e	412	param_enc = 0;
86885c28	413	else if (strcmp(value, "named_curve") == 0)
0f113f3e MC	414	param_enc = OPENSSL_EC_NAMED_CURVE;
	415	else
	416	return -2;
	417	return EVP_PKEY_CTX_set_ec_param_enc(ctx, param_enc);
86885c28	418	} else if (strcmp(type, "ecdh_kdf_md") == 0) {
0f113f3e	419	const EVP_MD *md;
75ebbd9a	420	if ((md = EVP_get_digestbyname(value)) == NULL) {
0f113f3e MC	421	ECerr(EC_F_PKEY_EC_CTRL_STR, EC_R_INVALID_DIGEST);
	422	return 0;
	423	}
	424	return EVP_PKEY_CTX_set_ecdh_kdf_md(ctx, md);
86885c28	425	} else if (strcmp(type, "ecdh_cofactor_mode") == 0) {
0f113f3e MC	426	int co_mode;
	427	co_mode = atoi(value);
	428	return EVP_PKEY_CTX_set_ecdh_cofactor_mode(ctx, co_mode);
	429	}
	430
	431	return -2;
	432	}
9ca7047d DSH	433
9ca7047d DSH	434	static int pkey_ec_paramgen(EVP_PKEY_CTX ctx, EVP_PKEY pkey)
0f113f3e MC	435	{
	436	EC_KEY *ec = NULL;
	437	EC_PKEY_CTX *dctx = ctx->data;
	438	int ret = 0;
	439	if (dctx->gen_group == NULL) {
	440	ECerr(EC_F_PKEY_EC_PARAMGEN, EC_R_NO_PARAMETERS_SET);
	441	return 0;
	442	}
	443	ec = EC_KEY_new();
90945fa3	444	if (ec == NULL)
0f113f3e MC	445	return 0;
	446	ret = EC_KEY_set_group(ec, dctx->gen_group);
	447	if (ret)
	448	EVP_PKEY_assign_EC_KEY(pkey, ec);
	449	else
	450	EC_KEY_free(ec);
	451	return ret;
	452	}
9ca7047d DSH	453
9ca7047d DSH	454	static int pkey_ec_keygen(EVP_PKEY_CTX ctx, EVP_PKEY pkey)
0f113f3e MC	455	{
	456	EC_KEY *ec = NULL;
	457	EC_PKEY_CTX *dctx = ctx->data;
	458	if (ctx->pkey == NULL && dctx->gen_group == NULL) {
	459	ECerr(EC_F_PKEY_EC_KEYGEN, EC_R_NO_PARAMETERS_SET);
	460	return 0;
	461	}
	462	ec = EC_KEY_new();
	463	if (!ec)
	464	return 0;
	465	EVP_PKEY_assign_EC_KEY(pkey, ec);
	466	if (ctx->pkey) {
	467	/* Note: if error return, pkey is freed by parent routine */
	468	if (!EVP_PKEY_copy_parameters(pkey, ctx->pkey))
	469	return 0;
	470	} else {
	471	if (!EC_KEY_set_group(ec, dctx->gen_group))
	472	return 0;
	473	}
	474	return EC_KEY_generate_key(pkey->pkey.ec);
	475	}
	476
	477	const EVP_PKEY_METHOD ec_pkey_meth = {
	478	EVP_PKEY_EC,
	479	0,
	480	pkey_ec_init,
	481	pkey_ec_copy,
	482	pkey_ec_cleanup,
	483
	484	0,
	485	pkey_ec_paramgen,
	486
	487	0,
	488	pkey_ec_keygen,
	489
	490	0,
	491	pkey_ec_sign,
	492
	493	0,
	494	pkey_ec_verify,
	495
	496	0, 0,
	497
	498	0, 0, 0, 0,
	499
	500	0, 0,
	501
	502	0, 0,
	503
	504	0,
10bf4fc2	505	#ifndef OPENSSL_NO_EC
0f113f3e	506	pkey_ec_kdf_derive,
af6e2d51	507	#else
0f113f3e	508	0,
af6e2d51	509	#endif
0f113f3e MC	510	pkey_ec_ctrl,
	511	pkey_ec_ctrl_str
	512	};