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

/*
 * Copyright 2006-2016 The OpenSSL Project Authors. All Rights Reserved.
 *
 * Licensed under the OpenSSL license (the "License").  You may not use
 * this file except in compliance with the License.  You can obtain a copy
 * in the file LICENSE in the source distribution or at
 * https://www.openssl.org/source/license.html
 */

#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	1	/*
aa6bb135	2	* Copyright 2006-2016 The OpenSSL Project Authors. All Rights Reserved.
9ca7047d	3	*
aa6bb135 RS	4	* Licensed under the OpenSSL license (the "License"). You may not use
	5	* this file except in compliance with the License. You can obtain a copy
	6	* in the file LICENSE in the source distribution or at
	7	* https://www.openssl.org/source/license.html
9ca7047d DSH	8	*/
	9
	10	#include <stdio.h>
b39fc560	11	#include "internal/cryptlib.h"
9ca7047d DSH	12	#include <openssl/asn1t.h>
	13	#include <openssl/x509.h>
	14	#include <openssl/ec.h>
25af7a5d	15	#include "ec_lcl.h"
9ca7047d	16	#include <openssl/evp.h>
27af42f9	17	#include "internal/evp_int.h"
9ca7047d DSH	18
	19	/* EC pkey context structure */
	20
0f113f3e MC	21	typedef struct {
	22	/* Key and paramgen group */
	23	EC_GROUP *gen_group;
	24	/* message digest */
	25	const EVP_MD *md;
	26	/* Duplicate key if custom cofactor needed */
	27	EC_KEY *co_key;
	28	/* Cofactor mode */
	29	signed char cofactor_mode;
	30	/* KDF (if any) to use for ECDH */
	31	char kdf_type;
	32	/* Message digest to use for key derivation */
	33	const EVP_MD *kdf_md;
	34	/* User key material */
	35	unsigned char *kdf_ukm;
	36	size_t kdf_ukmlen;
	37	/* KDF output length */
	38	size_t kdf_outlen;
	39	} EC_PKEY_CTX;
9ca7047d DSH	40
9ca7047d DSH	41	static int pkey_ec_init(EVP_PKEY_CTX *ctx)
0f113f3e MC	42	{
0f113f3e MC	43	EC_PKEY_CTX *dctx;
b4faea50	44
64b25758	45	dctx = OPENSSL_zalloc(sizeof(*dctx));
90945fa3	46	if (dctx == NULL)
0f113f3e	47	return 0;
0f113f3e MC	48
0f113f3e MC	49	dctx->cofactor_mode = -1;
0f113f3e	50	dctx->kdf_type = EVP_PKEY_ECDH_KDF_NONE;
0f113f3e	51	ctx->data = dctx;
0f113f3e MC	52	return 1;
0f113f3e MC	53	}
9ca7047d	54
8bdcef40	55	static int pkey_ec_copy(EVP_PKEY_CTX dst, EVP_PKEY_CTX src)
0f113f3e MC	56	{
	57	EC_PKEY_CTX dctx, sctx;
	58	if (!pkey_ec_init(dst))
	59	return 0;
	60	sctx = src->data;
	61	dctx = dst->data;
	62	if (sctx->gen_group) {
	63	dctx->gen_group = EC_GROUP_dup(sctx->gen_group);
	64	if (!dctx->gen_group)
	65	return 0;
	66	}
	67	dctx->md = sctx->md;
	68
	69	if (sctx->co_key) {
	70	dctx->co_key = EC_KEY_dup(sctx->co_key);
	71	if (!dctx->co_key)
	72	return 0;
	73	}
	74	dctx->kdf_type = sctx->kdf_type;
	75	dctx->kdf_md = sctx->kdf_md;
	76	dctx->kdf_outlen = sctx->kdf_outlen;
	77	if (sctx->kdf_ukm) {
7644a9ae	78	dctx->kdf_ukm = OPENSSL_memdup(sctx->kdf_ukm, sctx->kdf_ukmlen);
0f113f3e MC	79	if (!dctx->kdf_ukm)
	80	return 0;
	81	} else
	82	dctx->kdf_ukm = NULL;
	83	dctx->kdf_ukmlen = sctx->kdf_ukmlen;
	84	return 1;
	85	}
8bdcef40	86
9ca7047d	87	static void pkey_ec_cleanup(EVP_PKEY_CTX *ctx)
0f113f3e MC	88	{
	89	EC_PKEY_CTX *dctx = ctx->data;
	90	if (dctx) {
8fdc3734 RS	91	EC_GROUP_free(dctx->gen_group);
8fdc3734 RS	92	EC_KEY_free(dctx->co_key);
b548a1f1	93	OPENSSL_free(dctx->kdf_ukm);
0f113f3e MC	94	OPENSSL_free(dctx);
	95	}
	96	}
9ca7047d	97
eaff5a14	98	static int pkey_ec_sign(EVP_PKEY_CTX ctx, unsigned char sig, size_t *siglen,
0f113f3e MC	99	const unsigned char *tbs, size_t tbslen)
	100	{
	101	int ret, type;
	102	unsigned int sltmp;
	103	EC_PKEY_CTX *dctx = ctx->data;
	104	EC_KEY *ec = ctx->pkey->pkey.ec;
	105
	106	if (!sig) {
	107	*siglen = ECDSA_size(ec);
	108	return 1;
	109	} else if (*siglen < (size_t)ECDSA_size(ec)) {
	110	ECerr(EC_F_PKEY_EC_SIGN, EC_R_BUFFER_TOO_SMALL);
	111	return 0;
	112	}
	113
	114	if (dctx->md)
	115	type = EVP_MD_type(dctx->md);
	116	else
	117	type = NID_sha1;
	118
	119	ret = ECDSA_sign(type, tbs, tbslen, sig, &sltmp, ec);
	120
	121	if (ret <= 0)
	122	return ret;
	123	*siglen = (size_t)sltmp;
	124	return 1;
	125	}
9ca7047d DSH	126
9ca7047d DSH	127	static int pkey_ec_verify(EVP_PKEY_CTX *ctx,
0f113f3e MC	128	const unsigned char *sig, size_t siglen,
	129	const unsigned char *tbs, size_t tbslen)
	130	{
	131	int ret, type;
	132	EC_PKEY_CTX *dctx = ctx->data;
	133	EC_KEY *ec = ctx->pkey->pkey.ec;
9ca7047d	134
0f113f3e MC	135	if (dctx->md)
	136	type = EVP_MD_type(dctx->md);
	137	else
	138	type = NID_sha1;
9ca7047d	139
0f113f3e	140	ret = ECDSA_verify(type, tbs, tbslen, sig, siglen, ec);
9ca7047d	141
0f113f3e MC	142	return ret;
0f113f3e MC	143	}
9ca7047d	144
10bf4fc2	145	#ifndef OPENSSL_NO_EC
0f113f3e MC	146	static int pkey_ec_derive(EVP_PKEY_CTX ctx, unsigned char key,
	147	size_t *keylen)
	148	{
	149	int ret;
	150	size_t outlen;
	151	const EC_POINT *pubkey = NULL;
	152	EC_KEY *eckey;
	153	EC_PKEY_CTX *dctx = ctx->data;
	154	if (!ctx->pkey \|\| !ctx->peerkey) {
	155	ECerr(EC_F_PKEY_EC_DERIVE, EC_R_KEYS_NOT_SET);
	156	return 0;
	157	}
	158
	159	eckey = dctx->co_key ? dctx->co_key : ctx->pkey->pkey.ec;
	160
	161	if (!key) {
	162	const EC_GROUP *group;
	163	group = EC_KEY_get0_group(eckey);
	164	*keylen = (EC_GROUP_get_degree(group) + 7) / 8;
	165	return 1;
	166	}
	167	pubkey = EC_KEY_get0_public_key(ctx->peerkey->pkey.ec);
	168
	169	/*
	170	* NB: unlike PKCS#3 DH, if *outlen is less than maximum size this is not
	171	* an error, the result is truncated.
	172	*/
	173
	174	outlen = *keylen;
	175
	176	ret = ECDH_compute_key(key, outlen, pubkey, eckey, 0);
	177	if (ret <= 0)
	178	return 0;
	179	*keylen = ret;
	180	return 1;
	181	}
9ca7047d	182
25af7a5d	183	static int pkey_ec_kdf_derive(EVP_PKEY_CTX *ctx,
0f113f3e MC	184	unsigned char key, size_t keylen)
	185	{
	186	EC_PKEY_CTX *dctx = ctx->data;
	187	unsigned char *ktmp = NULL;
	188	size_t ktmplen;
	189	int rv = 0;
	190	if (dctx->kdf_type == EVP_PKEY_ECDH_KDF_NONE)
	191	return pkey_ec_derive(ctx, key, keylen);
	192	if (!key) {
	193	*keylen = dctx->kdf_outlen;
	194	return 1;
	195	}
	196	if (*keylen != dctx->kdf_outlen)
	197	return 0;
	198	if (!pkey_ec_derive(ctx, NULL, &ktmplen))
	199	return 0;
	200	ktmp = OPENSSL_malloc(ktmplen);
90945fa3	201	if (ktmp == NULL)
0f113f3e MC	202	return 0;
	203	if (!pkey_ec_derive(ctx, ktmp, &ktmplen))
	204	goto err;
	205	/* Do KDF stuff */
	206	if (!ECDH_KDF_X9_62(key, *keylen, ktmp, ktmplen,
	207	dctx->kdf_ukm, dctx->kdf_ukmlen, dctx->kdf_md))
	208	goto err;
	209	rv = 1;
	210
	211	err:
4b45c6e5	212	OPENSSL_clear_free(ktmp, ktmplen);
0f113f3e MC	213	return rv;
0f113f3e MC	214	}
af6e2d51	215	#endif
25af7a5d	216
9ca7047d	217	static int pkey_ec_ctrl(EVP_PKEY_CTX ctx, int type, int p1, void p2)
0f113f3e MC	218	{
	219	EC_PKEY_CTX *dctx = ctx->data;
	220	EC_GROUP *group;
	221	switch (type) {
	222	case EVP_PKEY_CTRL_EC_PARAMGEN_CURVE_NID:
	223	group = EC_GROUP_new_by_curve_name(p1);
	224	if (group == NULL) {
	225	ECerr(EC_F_PKEY_EC_CTRL, EC_R_INVALID_CURVE);
	226	return 0;
	227	}
8fdc3734	228	EC_GROUP_free(dctx->gen_group);
0f113f3e MC	229	dctx->gen_group = group;
	230	return 1;
	231
	232	case EVP_PKEY_CTRL_EC_PARAM_ENC:
	233	if (!dctx->gen_group) {
	234	ECerr(EC_F_PKEY_EC_CTRL, EC_R_NO_PARAMETERS_SET);
	235	return 0;
	236	}
	237	EC_GROUP_set_asn1_flag(dctx->gen_group, p1);
	238	return 1;
24edfa9d	239
10bf4fc2	240	#ifndef OPENSSL_NO_EC
0f113f3e MC	241	case EVP_PKEY_CTRL_EC_ECDH_COFACTOR:
	242	if (p1 == -2) {
	243	if (dctx->cofactor_mode != -1)
	244	return dctx->cofactor_mode;
	245	else {
	246	EC_KEY *ec_key = ctx->pkey->pkey.ec;
	247	return EC_KEY_get_flags(ec_key) & EC_FLAG_COFACTOR_ECDH ? 1 :
	248	0;
	249	}
	250	} else if (p1 < -1 \|\| p1 > 1)
	251	return -2;
	252	dctx->cofactor_mode = p1;
	253	if (p1 != -1) {
	254	EC_KEY *ec_key = ctx->pkey->pkey.ec;
	255	if (!ec_key->group)
	256	return -2;
	257	/* If cofactor is 1 cofactor mode does nothing */
	258	if (BN_is_one(ec_key->group->cofactor))
	259	return 1;
	260	if (!dctx->co_key) {
	261	dctx->co_key = EC_KEY_dup(ec_key);
	262	if (!dctx->co_key)
	263	return 0;
	264	}
	265	if (p1)
	266	EC_KEY_set_flags(dctx->co_key, EC_FLAG_COFACTOR_ECDH);
	267	else
	268	EC_KEY_clear_flags(dctx->co_key, EC_FLAG_COFACTOR_ECDH);
8fdc3734	269	} else {
0f113f3e MC	270	EC_KEY_free(dctx->co_key);
	271	dctx->co_key = NULL;
	272	}
	273	return 1;
af6e2d51	274	#endif
25af7a5d	275
0f113f3e MC	276	case EVP_PKEY_CTRL_EC_KDF_TYPE:
	277	if (p1 == -2)
	278	return dctx->kdf_type;
	279	if (p1 != EVP_PKEY_ECDH_KDF_NONE && p1 != EVP_PKEY_ECDH_KDF_X9_62)
	280	return -2;
	281	dctx->kdf_type = p1;
	282	return 1;
	283
	284	case EVP_PKEY_CTRL_EC_KDF_MD:
	285	dctx->kdf_md = p2;
	286	return 1;
	287
	288	case EVP_PKEY_CTRL_GET_EC_KDF_MD:
	289	(const EVP_MD *)p2 = dctx->kdf_md;
	290	return 1;
	291
	292	case EVP_PKEY_CTRL_EC_KDF_OUTLEN:
	293	if (p1 <= 0)
	294	return -2;
	295	dctx->kdf_outlen = (size_t)p1;
	296	return 1;
	297
	298	case EVP_PKEY_CTRL_GET_EC_KDF_OUTLEN:
	299	(int )p2 = dctx->kdf_outlen;
	300	return 1;
	301
	302	case EVP_PKEY_CTRL_EC_KDF_UKM:
b548a1f1	303	OPENSSL_free(dctx->kdf_ukm);
0f113f3e MC	304	dctx->kdf_ukm = p2;
	305	if (p2)
	306	dctx->kdf_ukmlen = p1;
	307	else
	308	dctx->kdf_ukmlen = 0;
	309	return 1;
	310
	311	case EVP_PKEY_CTRL_GET_EC_KDF_UKM:
	312	(unsigned char *)p2 = dctx->kdf_ukm;
	313	return dctx->kdf_ukmlen;
	314
	315	case EVP_PKEY_CTRL_MD:
	316	if (EVP_MD_type((const EVP_MD *)p2) != NID_sha1 &&
	317	EVP_MD_type((const EVP_MD *)p2) != NID_ecdsa_with_SHA1 &&
	318	EVP_MD_type((const EVP_MD *)p2) != NID_sha224 &&
	319	EVP_MD_type((const EVP_MD *)p2) != NID_sha256 &&
	320	EVP_MD_type((const EVP_MD *)p2) != NID_sha384 &&
	321	EVP_MD_type((const EVP_MD *)p2) != NID_sha512) {
	322	ECerr(EC_F_PKEY_EC_CTRL, EC_R_INVALID_DIGEST_TYPE);
	323	return 0;
	324	}
	325	dctx->md = p2;
	326	return 1;
	327
	328	case EVP_PKEY_CTRL_GET_MD:
	329	(const EVP_MD *)p2 = dctx->md;
	330	return 1;
	331
	332	case EVP_PKEY_CTRL_PEER_KEY:
	333	/* Default behaviour is OK */
	334	case EVP_PKEY_CTRL_DIGESTINIT:
	335	case EVP_PKEY_CTRL_PKCS7_SIGN:
	336	case EVP_PKEY_CTRL_CMS_SIGN:
	337	return 1;
	338
	339	default:
	340	return -2;
	341
	342	}
	343	}
	344
9ca7047d	345	static int pkey_ec_ctrl_str(EVP_PKEY_CTX *ctx,
0f113f3e MC	346	const char type, const char value)
0f113f3e MC	347	{
86885c28	348	if (strcmp(type, "ec_paramgen_curve") == 0) {
0f113f3e MC	349	int nid;
	350	nid = EC_curve_nist2nid(value);
	351	if (nid == NID_undef)
	352	nid = OBJ_sn2nid(value);
	353	if (nid == NID_undef)
	354	nid = OBJ_ln2nid(value);
	355	if (nid == NID_undef) {
	356	ECerr(EC_F_PKEY_EC_CTRL_STR, EC_R_INVALID_CURVE);
	357	return 0;
	358	}
	359	return EVP_PKEY_CTX_set_ec_paramgen_curve_nid(ctx, nid);
86885c28	360	} else if (strcmp(type, "ec_param_enc") == 0) {
0f113f3e	361	int param_enc;
86885c28	362	if (strcmp(value, "explicit") == 0)
0f113f3e	363	param_enc = 0;
86885c28	364	else if (strcmp(value, "named_curve") == 0)
0f113f3e MC	365	param_enc = OPENSSL_EC_NAMED_CURVE;
	366	else
	367	return -2;
	368	return EVP_PKEY_CTX_set_ec_param_enc(ctx, param_enc);
86885c28	369	} else if (strcmp(type, "ecdh_kdf_md") == 0) {
0f113f3e	370	const EVP_MD *md;
75ebbd9a	371	if ((md = EVP_get_digestbyname(value)) == NULL) {
0f113f3e MC	372	ECerr(EC_F_PKEY_EC_CTRL_STR, EC_R_INVALID_DIGEST);
	373	return 0;
	374	}
	375	return EVP_PKEY_CTX_set_ecdh_kdf_md(ctx, md);
86885c28	376	} else if (strcmp(type, "ecdh_cofactor_mode") == 0) {
0f113f3e MC	377	int co_mode;
	378	co_mode = atoi(value);
	379	return EVP_PKEY_CTX_set_ecdh_cofactor_mode(ctx, co_mode);
	380	}
	381
	382	return -2;
	383	}
9ca7047d DSH	384
9ca7047d DSH	385	static int pkey_ec_paramgen(EVP_PKEY_CTX ctx, EVP_PKEY pkey)
0f113f3e MC	386	{
	387	EC_KEY *ec = NULL;
	388	EC_PKEY_CTX *dctx = ctx->data;
	389	int ret = 0;
	390	if (dctx->gen_group == NULL) {
	391	ECerr(EC_F_PKEY_EC_PARAMGEN, EC_R_NO_PARAMETERS_SET);
	392	return 0;
	393	}
	394	ec = EC_KEY_new();
90945fa3	395	if (ec == NULL)
0f113f3e MC	396	return 0;
	397	ret = EC_KEY_set_group(ec, dctx->gen_group);
	398	if (ret)
	399	EVP_PKEY_assign_EC_KEY(pkey, ec);
	400	else
	401	EC_KEY_free(ec);
	402	return ret;
	403	}
9ca7047d DSH	404
9ca7047d DSH	405	static int pkey_ec_keygen(EVP_PKEY_CTX ctx, EVP_PKEY pkey)
0f113f3e MC	406	{
	407	EC_KEY *ec = NULL;
	408	EC_PKEY_CTX *dctx = ctx->data;
	409	if (ctx->pkey == NULL && dctx->gen_group == NULL) {
	410	ECerr(EC_F_PKEY_EC_KEYGEN, EC_R_NO_PARAMETERS_SET);
	411	return 0;
	412	}
	413	ec = EC_KEY_new();
	414	if (!ec)
	415	return 0;
	416	EVP_PKEY_assign_EC_KEY(pkey, ec);
	417	if (ctx->pkey) {
	418	/* Note: if error return, pkey is freed by parent routine */
	419	if (!EVP_PKEY_copy_parameters(pkey, ctx->pkey))
	420	return 0;
	421	} else {
	422	if (!EC_KEY_set_group(ec, dctx->gen_group))
	423	return 0;
	424	}
	425	return EC_KEY_generate_key(pkey->pkey.ec);
	426	}
	427
	428	const EVP_PKEY_METHOD ec_pkey_meth = {
	429	EVP_PKEY_EC,
	430	0,
	431	pkey_ec_init,
	432	pkey_ec_copy,
	433	pkey_ec_cleanup,
	434
	435	0,
	436	pkey_ec_paramgen,
	437
	438	0,
	439	pkey_ec_keygen,
	440
	441	0,
	442	pkey_ec_sign,
	443
	444	0,
	445	pkey_ec_verify,
	446
	447	0, 0,
	448
	449	0, 0, 0, 0,
	450
	451	0, 0,
	452
	453	0, 0,
	454
	455	0,
10bf4fc2	456	#ifndef OPENSSL_NO_EC
0f113f3e	457	pkey_ec_kdf_derive,
af6e2d51	458	#else
0f113f3e	459	0,
af6e2d51	460	#endif
0f113f3e MC	461	pkey_ec_ctrl,
	462	pkey_ec_ctrl_str
	463	};