[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"

#if !defined(OPENSSL_NO_SM2)
# include <openssl/sm2.h>
#endif

/* 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;
    const int ec_nid = EC_GROUP_get_curve_name(EC_KEY_get0_group(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;

    if (ec_nid == NID_sm2) {
#if defined(OPENSSL_NO_SM2)
        ret = -1;
#else
        ret = SM2_sign(type, tbs, tbslen, sig, &sltmp, ec);
#endif
    } else {
        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;
    const int ec_nid = EC_GROUP_get_curve_name(EC_KEY_get0_group(ec));

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

    if (ec_nid == NID_sm2) {
#if defined(OPENSSL_NO_SM2)
        ret = -1;
#else
        ret = SM2_verify(type, tbs, tbslen, sig, siglen, ec);
#endif
    } else {
        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_ecies_encrypt(EVP_PKEY_CTX *ctx,
                              unsigned char *out, size_t *outlen,
                              const unsigned char *in, size_t inlen)
{
    int ret;
    EC_KEY *ec = ctx->pkey->pkey.ec;
    const int ec_nid = EC_GROUP_get_curve_name(EC_KEY_get0_group(ec));

    if (ec_nid == NID_sm2) {
# if defined(OPENSSL_NO_SM2)
        ret = -1;
# else
        int md_type;
        EC_PKEY_CTX *dctx = ctx->data;

        if (dctx->md)
            md_type = EVP_MD_type(dctx->md);
        else if (ec_nid == NID_sm2)
            md_type = NID_sm3;
        else
            md_type = NID_sha256;

        if (out == NULL) {
            *outlen = SM2_ciphertext_size(ec, EVP_get_digestbynid(md_type),
                                          inlen);
            ret = 1;
        }
        else {
            ret = SM2_encrypt(ec, EVP_get_digestbynid(md_type),
                              in, inlen, out, outlen);
        }
# endif
    } else {
        /* standard ECIES not implemented */
        ret = -1;
    }

    return ret;
}

static int pkey_ecies_decrypt(EVP_PKEY_CTX *ctx,
                              unsigned char *out, size_t *outlen,
                              const unsigned char *in, size_t inlen)
{
    int ret;
    EC_KEY *ec = ctx->pkey->pkey.ec;
    const int ec_nid = EC_GROUP_get_curve_name(EC_KEY_get0_group(ec));

    if (ec_nid == NID_sm2) {
# if defined(OPENSSL_NO_SM2)
        ret = -1;
# else
        int md_type;
        EC_PKEY_CTX *dctx = ctx->data;

        if (dctx->md)
            md_type = EVP_MD_type(dctx->md);
        else if (ec_nid == NID_sm2)
            md_type = NID_sm3;
        else
            md_type = NID_sha256;

        if (out == NULL) {
            *outlen = SM2_plaintext_size(ec, EVP_get_digestbynid(md_type), inlen);
            ret = 1;
        }
        else {
            ret = SM2_decrypt(ec, EVP_get_digestbynid(md_type),
                              in, inlen, out, outlen);
        }
# endif
    } else {
        /* standard ECIES not implemented */
        ret = -1;
    }

    return ret;
}

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 &&
            EVP_MD_type((const EVP_MD *)p2) != NID_sm3) {
            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,
    pkey_ecies_encrypt,

    0,
    pkey_ecies_decrypt,

    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	18
3d328a44	19	#if !defined(OPENSSL_NO_SM2)
dceb99a5	20	# include <openssl/sm2.h>
3d328a44 JL	21	#endif
3d328a44 JL	22
9ca7047d DSH	23	/* EC pkey context structure */
9ca7047d DSH	24
0f113f3e MC	25	typedef struct {
	26	/* Key and paramgen group */
	27	EC_GROUP *gen_group;
	28	/* message digest */
	29	const EVP_MD *md;
	30	/* Duplicate key if custom cofactor needed */
	31	EC_KEY *co_key;
	32	/* Cofactor mode */
	33	signed char cofactor_mode;
	34	/* KDF (if any) to use for ECDH */
	35	char kdf_type;
	36	/* Message digest to use for key derivation */
	37	const EVP_MD *kdf_md;
	38	/* User key material */
	39	unsigned char *kdf_ukm;
	40	size_t kdf_ukmlen;
	41	/* KDF output length */
	42	size_t kdf_outlen;
	43	} EC_PKEY_CTX;
9ca7047d DSH	44
9ca7047d DSH	45	static int pkey_ec_init(EVP_PKEY_CTX *ctx)
0f113f3e MC	46	{
0f113f3e MC	47	EC_PKEY_CTX *dctx;
b4faea50	48
64b25758	49	dctx = OPENSSL_zalloc(sizeof(*dctx));
90945fa3	50	if (dctx == NULL)
0f113f3e	51	return 0;
0f113f3e MC	52
0f113f3e MC	53	dctx->cofactor_mode = -1;
0f113f3e	54	dctx->kdf_type = EVP_PKEY_ECDH_KDF_NONE;
0f113f3e	55	ctx->data = dctx;
0f113f3e MC	56	return 1;
0f113f3e MC	57	}
9ca7047d	58
8bdcef40	59	static int pkey_ec_copy(EVP_PKEY_CTX dst, EVP_PKEY_CTX src)
0f113f3e MC	60	{
	61	EC_PKEY_CTX dctx, sctx;
	62	if (!pkey_ec_init(dst))
	63	return 0;
	64	sctx = src->data;
	65	dctx = dst->data;
	66	if (sctx->gen_group) {
	67	dctx->gen_group = EC_GROUP_dup(sctx->gen_group);
	68	if (!dctx->gen_group)
	69	return 0;
	70	}
	71	dctx->md = sctx->md;
	72
	73	if (sctx->co_key) {
	74	dctx->co_key = EC_KEY_dup(sctx->co_key);
	75	if (!dctx->co_key)
	76	return 0;
	77	}
	78	dctx->kdf_type = sctx->kdf_type;
	79	dctx->kdf_md = sctx->kdf_md;
	80	dctx->kdf_outlen = sctx->kdf_outlen;
	81	if (sctx->kdf_ukm) {
7644a9ae	82	dctx->kdf_ukm = OPENSSL_memdup(sctx->kdf_ukm, sctx->kdf_ukmlen);
0f113f3e MC	83	if (!dctx->kdf_ukm)
	84	return 0;
	85	} else
	86	dctx->kdf_ukm = NULL;
	87	dctx->kdf_ukmlen = sctx->kdf_ukmlen;
	88	return 1;
	89	}
8bdcef40	90
9ca7047d	91	static void pkey_ec_cleanup(EVP_PKEY_CTX *ctx)
0f113f3e MC	92	{
	93	EC_PKEY_CTX *dctx = ctx->data;
	94	if (dctx) {
8fdc3734 RS	95	EC_GROUP_free(dctx->gen_group);
8fdc3734 RS	96	EC_KEY_free(dctx->co_key);
b548a1f1	97	OPENSSL_free(dctx->kdf_ukm);
0f113f3e MC	98	OPENSSL_free(dctx);
	99	}
	100	}
9ca7047d	101
eaff5a14	102	static int pkey_ec_sign(EVP_PKEY_CTX ctx, unsigned char sig, size_t *siglen,
0f113f3e MC	103	const unsigned char *tbs, size_t tbslen)
	104	{
	105	int ret, type;
	106	unsigned int sltmp;
	107	EC_PKEY_CTX *dctx = ctx->data;
	108	EC_KEY *ec = ctx->pkey->pkey.ec;
3d328a44	109	const int ec_nid = EC_GROUP_get_curve_name(EC_KEY_get0_group(ec));
0f113f3e MC	110
	111	if (!sig) {
	112	*siglen = ECDSA_size(ec);
	113	return 1;
	114	} else if (*siglen < (size_t)ECDSA_size(ec)) {
	115	ECerr(EC_F_PKEY_EC_SIGN, EC_R_BUFFER_TOO_SMALL);
	116	return 0;
	117	}
	118
	119	if (dctx->md)
	120	type = EVP_MD_type(dctx->md);
	121	else
	122	type = NID_sha1;
	123
3d328a44 JL	124	if (ec_nid == NID_sm2) {
3d328a44 JL	125	#if defined(OPENSSL_NO_SM2)
dceb99a5	126	ret = -1;
3d328a44	127	#else
dceb99a5	128	ret = SM2_sign(type, tbs, tbslen, sig, &sltmp, ec);
3d328a44	129	#endif
dceb99a5 JL	130	} else {
dceb99a5 JL	131	ret = ECDSA_sign(type, tbs, tbslen, sig, &sltmp, ec);
3d328a44	132	}
0f113f3e MC	133
	134	if (ret <= 0)
	135	return ret;
	136	*siglen = (size_t)sltmp;
	137	return 1;
	138	}
9ca7047d DSH	139
9ca7047d DSH	140	static int pkey_ec_verify(EVP_PKEY_CTX *ctx,
0f113f3e MC	141	const unsigned char *sig, size_t siglen,
	142	const unsigned char *tbs, size_t tbslen)
	143	{
	144	int ret, type;
	145	EC_PKEY_CTX *dctx = ctx->data;
	146	EC_KEY *ec = ctx->pkey->pkey.ec;
3d328a44	147	const int ec_nid = EC_GROUP_get_curve_name(EC_KEY_get0_group(ec));
9ca7047d	148
0f113f3e MC	149	if (dctx->md)
	150	type = EVP_MD_type(dctx->md);
	151	else
	152	type = NID_sha1;
9ca7047d	153
3d328a44 JL	154	if (ec_nid == NID_sm2) {
3d328a44 JL	155	#if defined(OPENSSL_NO_SM2)
dceb99a5	156	ret = -1;
3d328a44	157	#else
dceb99a5	158	ret = SM2_verify(type, tbs, tbslen, sig, siglen, ec);
3d328a44	159	#endif
dceb99a5 JL	160	} else {
dceb99a5 JL	161	ret = ECDSA_verify(type, tbs, tbslen, sig, siglen, ec);
3d328a44	162	}
9ca7047d	163
0f113f3e MC	164	return ret;
0f113f3e MC	165	}
9ca7047d	166
10bf4fc2	167	#ifndef OPENSSL_NO_EC
dceb99a5	168	static int pkey_ec_derive(EVP_PKEY_CTX ctx, unsigned char key, size_t *keylen)
0f113f3e MC	169	{
	170	int ret;
	171	size_t outlen;
	172	const EC_POINT *pubkey = NULL;
	173	EC_KEY *eckey;
	174	EC_PKEY_CTX *dctx = ctx->data;
	175	if (!ctx->pkey \|\| !ctx->peerkey) {
	176	ECerr(EC_F_PKEY_EC_DERIVE, EC_R_KEYS_NOT_SET);
	177	return 0;
	178	}
	179
	180	eckey = dctx->co_key ? dctx->co_key : ctx->pkey->pkey.ec;
	181
	182	if (!key) {
	183	const EC_GROUP *group;
	184	group = EC_KEY_get0_group(eckey);
	185	*keylen = (EC_GROUP_get_degree(group) + 7) / 8;
	186	return 1;
	187	}
	188	pubkey = EC_KEY_get0_public_key(ctx->peerkey->pkey.ec);
	189
	190	/*
	191	* NB: unlike PKCS#3 DH, if *outlen is less than maximum size this is not
	192	* an error, the result is truncated.
	193	*/
	194
	195	outlen = *keylen;
	196
	197	ret = ECDH_compute_key(key, outlen, pubkey, eckey, 0);
	198	if (ret <= 0)
	199	return 0;
	200	*keylen = ret;
	201	return 1;
	202	}
9ca7047d	203
dceb99a5 JL	204	static int pkey_ecies_encrypt(EVP_PKEY_CTX *ctx,
	205	unsigned char out, size_t outlen,
	206	const unsigned char *in, size_t inlen)
	207	{
1bf2cc23	208	int ret;
dceb99a5 JL	209	EC_KEY *ec = ctx->pkey->pkey.ec;
	210	const int ec_nid = EC_GROUP_get_curve_name(EC_KEY_get0_group(ec));
	211
dceb99a5 JL	212	if (ec_nid == NID_sm2) {
	213	# if defined(OPENSSL_NO_SM2)
	214	ret = -1;
	215	# else
1bf2cc23 MC	216	int md_type;
	217	EC_PKEY_CTX *dctx = ctx->data;
	218
	219	if (dctx->md)
	220	md_type = EVP_MD_type(dctx->md);
	221	else if (ec_nid == NID_sm2)
	222	md_type = NID_sm3;
	223	else
	224	md_type = NID_sha256;
	225
4e664750	226	if (out == NULL) {
1bf2cc23 MC	227	*outlen = SM2_ciphertext_size(ec, EVP_get_digestbynid(md_type),
1bf2cc23 MC	228	inlen);
4e664750 JL	229	ret = 1;
	230	}
	231	else {
	232	ret = SM2_encrypt(ec, EVP_get_digestbynid(md_type),
	233	in, inlen, out, outlen);
	234	}
dceb99a5 JL	235	# endif
	236	} else {
	237	/* standard ECIES not implemented */
	238	ret = -1;
	239	}
	240
	241	return ret;
	242	}
	243
	244	static int pkey_ecies_decrypt(EVP_PKEY_CTX *ctx,
	245	unsigned char out, size_t outlen,
	246	const unsigned char *in, size_t inlen)
	247	{
1bf2cc23	248	int ret;
dceb99a5 JL	249	EC_KEY *ec = ctx->pkey->pkey.ec;
	250	const int ec_nid = EC_GROUP_get_curve_name(EC_KEY_get0_group(ec));
	251
dceb99a5 JL	252	if (ec_nid == NID_sm2) {
	253	# if defined(OPENSSL_NO_SM2)
	254	ret = -1;
	255	# else
1bf2cc23 MC	256	int md_type;
	257	EC_PKEY_CTX *dctx = ctx->data;
	258
	259	if (dctx->md)
	260	md_type = EVP_MD_type(dctx->md);
	261	else if (ec_nid == NID_sm2)
	262	md_type = NID_sm3;
	263	else
	264	md_type = NID_sha256;
	265
4e664750 JL	266	if (out == NULL) {
	267	*outlen = SM2_plaintext_size(ec, EVP_get_digestbynid(md_type), inlen);
	268	ret = 1;
	269	}
	270	else {
	271	ret = SM2_decrypt(ec, EVP_get_digestbynid(md_type),
	272	in, inlen, out, outlen);
	273	}
dceb99a5 JL	274	# endif
	275	} else {
	276	/* standard ECIES not implemented */
	277	ret = -1;
	278	}
	279
	280	return ret;
	281	}
	282
25af7a5d	283	static int pkey_ec_kdf_derive(EVP_PKEY_CTX *ctx,
0f113f3e MC	284	unsigned char key, size_t keylen)
	285	{
	286	EC_PKEY_CTX *dctx = ctx->data;
	287	unsigned char *ktmp = NULL;
	288	size_t ktmplen;
	289	int rv = 0;
	290	if (dctx->kdf_type == EVP_PKEY_ECDH_KDF_NONE)
	291	return pkey_ec_derive(ctx, key, keylen);
	292	if (!key) {
	293	*keylen = dctx->kdf_outlen;
	294	return 1;
	295	}
	296	if (*keylen != dctx->kdf_outlen)
	297	return 0;
	298	if (!pkey_ec_derive(ctx, NULL, &ktmplen))
	299	return 0;
	300	ktmp = OPENSSL_malloc(ktmplen);
90945fa3	301	if (ktmp == NULL)
0f113f3e MC	302	return 0;
	303	if (!pkey_ec_derive(ctx, ktmp, &ktmplen))
	304	goto err;
	305	/* Do KDF stuff */
	306	if (!ECDH_KDF_X9_62(key, *keylen, ktmp, ktmplen,
	307	dctx->kdf_ukm, dctx->kdf_ukmlen, dctx->kdf_md))
	308	goto err;
	309	rv = 1;
	310
	311	err:
4b45c6e5	312	OPENSSL_clear_free(ktmp, ktmplen);
0f113f3e MC	313	return rv;
0f113f3e MC	314	}
af6e2d51	315	#endif
25af7a5d	316
9ca7047d	317	static int pkey_ec_ctrl(EVP_PKEY_CTX ctx, int type, int p1, void p2)
0f113f3e MC	318	{
	319	EC_PKEY_CTX *dctx = ctx->data;
	320	EC_GROUP *group;
	321	switch (type) {
	322	case EVP_PKEY_CTRL_EC_PARAMGEN_CURVE_NID:
	323	group = EC_GROUP_new_by_curve_name(p1);
	324	if (group == NULL) {
	325	ECerr(EC_F_PKEY_EC_CTRL, EC_R_INVALID_CURVE);
	326	return 0;
	327	}
8fdc3734	328	EC_GROUP_free(dctx->gen_group);
0f113f3e MC	329	dctx->gen_group = group;
	330	return 1;
	331
	332	case EVP_PKEY_CTRL_EC_PARAM_ENC:
	333	if (!dctx->gen_group) {
	334	ECerr(EC_F_PKEY_EC_CTRL, EC_R_NO_PARAMETERS_SET);
	335	return 0;
	336	}
	337	EC_GROUP_set_asn1_flag(dctx->gen_group, p1);
	338	return 1;
24edfa9d	339
10bf4fc2	340	#ifndef OPENSSL_NO_EC
0f113f3e MC	341	case EVP_PKEY_CTRL_EC_ECDH_COFACTOR:
	342	if (p1 == -2) {
	343	if (dctx->cofactor_mode != -1)
	344	return dctx->cofactor_mode;
	345	else {
	346	EC_KEY *ec_key = ctx->pkey->pkey.ec;
dceb99a5	347	return EC_KEY_get_flags(ec_key) & EC_FLAG_COFACTOR_ECDH ? 1 : 0;
0f113f3e MC	348	}
	349	} else if (p1 < -1 \|\| p1 > 1)
	350	return -2;
	351	dctx->cofactor_mode = p1;
	352	if (p1 != -1) {
	353	EC_KEY *ec_key = ctx->pkey->pkey.ec;
	354	if (!ec_key->group)
	355	return -2;
	356	/* If cofactor is 1 cofactor mode does nothing */
	357	if (BN_is_one(ec_key->group->cofactor))
	358	return 1;
	359	if (!dctx->co_key) {
	360	dctx->co_key = EC_KEY_dup(ec_key);
	361	if (!dctx->co_key)
	362	return 0;
	363	}
	364	if (p1)
	365	EC_KEY_set_flags(dctx->co_key, EC_FLAG_COFACTOR_ECDH);
	366	else
	367	EC_KEY_clear_flags(dctx->co_key, EC_FLAG_COFACTOR_ECDH);
8fdc3734	368	} else {
0f113f3e MC	369	EC_KEY_free(dctx->co_key);
	370	dctx->co_key = NULL;
	371	}
	372	return 1;
af6e2d51	373	#endif
25af7a5d	374
0f113f3e MC	375	case EVP_PKEY_CTRL_EC_KDF_TYPE:
	376	if (p1 == -2)
	377	return dctx->kdf_type;
	378	if (p1 != EVP_PKEY_ECDH_KDF_NONE && p1 != EVP_PKEY_ECDH_KDF_X9_62)
	379	return -2;
	380	dctx->kdf_type = p1;
	381	return 1;
	382
	383	case EVP_PKEY_CTRL_EC_KDF_MD:
	384	dctx->kdf_md = p2;
	385	return 1;
	386
	387	case EVP_PKEY_CTRL_GET_EC_KDF_MD:
	388	(const EVP_MD *)p2 = dctx->kdf_md;
	389	return 1;
	390
	391	case EVP_PKEY_CTRL_EC_KDF_OUTLEN:
	392	if (p1 <= 0)
	393	return -2;
	394	dctx->kdf_outlen = (size_t)p1;
	395	return 1;
	396
	397	case EVP_PKEY_CTRL_GET_EC_KDF_OUTLEN:
	398	(int )p2 = dctx->kdf_outlen;
	399	return 1;
	400
	401	case EVP_PKEY_CTRL_EC_KDF_UKM:
b548a1f1	402	OPENSSL_free(dctx->kdf_ukm);
0f113f3e MC	403	dctx->kdf_ukm = p2;
	404	if (p2)
	405	dctx->kdf_ukmlen = p1;
	406	else
	407	dctx->kdf_ukmlen = 0;
	408	return 1;
	409
	410	case EVP_PKEY_CTRL_GET_EC_KDF_UKM:
	411	(unsigned char *)p2 = dctx->kdf_ukm;
	412	return dctx->kdf_ukmlen;
	413
	414	case EVP_PKEY_CTRL_MD:
	415	if (EVP_MD_type((const EVP_MD *)p2) != NID_sha1 &&
	416	EVP_MD_type((const EVP_MD *)p2) != NID_ecdsa_with_SHA1 &&
	417	EVP_MD_type((const EVP_MD *)p2) != NID_sha224 &&
	418	EVP_MD_type((const EVP_MD *)p2) != NID_sha256 &&
	419	EVP_MD_type((const EVP_MD *)p2) != NID_sha384 &&
3d328a44 JL	420	EVP_MD_type((const EVP_MD *)p2) != NID_sha512 &&
3d328a44 JL	421	EVP_MD_type((const EVP_MD *)p2) != NID_sm3) {
0f113f3e MC	422	ECerr(EC_F_PKEY_EC_CTRL, EC_R_INVALID_DIGEST_TYPE);
	423	return 0;
	424	}
	425	dctx->md = p2;
	426	return 1;
	427
	428	case EVP_PKEY_CTRL_GET_MD:
	429	(const EVP_MD *)p2 = dctx->md;
	430	return 1;
	431
	432	case EVP_PKEY_CTRL_PEER_KEY:
	433	/* Default behaviour is OK */
	434	case EVP_PKEY_CTRL_DIGESTINIT:
	435	case EVP_PKEY_CTRL_PKCS7_SIGN:
	436	case EVP_PKEY_CTRL_CMS_SIGN:
	437	return 1;
	438
	439	default:
	440	return -2;
	441
	442	}
	443	}
	444
9ca7047d	445	static int pkey_ec_ctrl_str(EVP_PKEY_CTX *ctx,
0f113f3e MC	446	const char type, const char value)
0f113f3e MC	447	{
86885c28	448	if (strcmp(type, "ec_paramgen_curve") == 0) {
0f113f3e MC	449	int nid;
	450	nid = EC_curve_nist2nid(value);
	451	if (nid == NID_undef)
	452	nid = OBJ_sn2nid(value);
	453	if (nid == NID_undef)
	454	nid = OBJ_ln2nid(value);
	455	if (nid == NID_undef) {
	456	ECerr(EC_F_PKEY_EC_CTRL_STR, EC_R_INVALID_CURVE);
	457	return 0;
	458	}
	459	return EVP_PKEY_CTX_set_ec_paramgen_curve_nid(ctx, nid);
86885c28	460	} else if (strcmp(type, "ec_param_enc") == 0) {
0f113f3e	461	int param_enc;
86885c28	462	if (strcmp(value, "explicit") == 0)
0f113f3e	463	param_enc = 0;
86885c28	464	else if (strcmp(value, "named_curve") == 0)
0f113f3e MC	465	param_enc = OPENSSL_EC_NAMED_CURVE;
	466	else
	467	return -2;
	468	return EVP_PKEY_CTX_set_ec_param_enc(ctx, param_enc);
86885c28	469	} else if (strcmp(type, "ecdh_kdf_md") == 0) {
0f113f3e	470	const EVP_MD *md;
75ebbd9a	471	if ((md = EVP_get_digestbyname(value)) == NULL) {
0f113f3e MC	472	ECerr(EC_F_PKEY_EC_CTRL_STR, EC_R_INVALID_DIGEST);
	473	return 0;
	474	}
	475	return EVP_PKEY_CTX_set_ecdh_kdf_md(ctx, md);
86885c28	476	} else if (strcmp(type, "ecdh_cofactor_mode") == 0) {
0f113f3e MC	477	int co_mode;
	478	co_mode = atoi(value);
	479	return EVP_PKEY_CTX_set_ecdh_cofactor_mode(ctx, co_mode);
	480	}
	481
	482	return -2;
	483	}
9ca7047d DSH	484
9ca7047d DSH	485	static int pkey_ec_paramgen(EVP_PKEY_CTX ctx, EVP_PKEY pkey)
0f113f3e MC	486	{
	487	EC_KEY *ec = NULL;
	488	EC_PKEY_CTX *dctx = ctx->data;
	489	int ret = 0;
	490	if (dctx->gen_group == NULL) {
	491	ECerr(EC_F_PKEY_EC_PARAMGEN, EC_R_NO_PARAMETERS_SET);
	492	return 0;
	493	}
	494	ec = EC_KEY_new();
90945fa3	495	if (ec == NULL)
0f113f3e MC	496	return 0;
	497	ret = EC_KEY_set_group(ec, dctx->gen_group);
	498	if (ret)
	499	EVP_PKEY_assign_EC_KEY(pkey, ec);
	500	else
	501	EC_KEY_free(ec);
	502	return ret;
	503	}
9ca7047d DSH	504
9ca7047d DSH	505	static int pkey_ec_keygen(EVP_PKEY_CTX ctx, EVP_PKEY pkey)
0f113f3e MC	506	{
	507	EC_KEY *ec = NULL;
	508	EC_PKEY_CTX *dctx = ctx->data;
	509	if (ctx->pkey == NULL && dctx->gen_group == NULL) {
	510	ECerr(EC_F_PKEY_EC_KEYGEN, EC_R_NO_PARAMETERS_SET);
	511	return 0;
	512	}
	513	ec = EC_KEY_new();
	514	if (!ec)
	515	return 0;
	516	EVP_PKEY_assign_EC_KEY(pkey, ec);
	517	if (ctx->pkey) {
	518	/* Note: if error return, pkey is freed by parent routine */
	519	if (!EVP_PKEY_copy_parameters(pkey, ctx->pkey))
	520	return 0;
	521	} else {
	522	if (!EC_KEY_set_group(ec, dctx->gen_group))
	523	return 0;
	524	}
	525	return EC_KEY_generate_key(pkey->pkey.ec);
	526	}
	527
	528	const EVP_PKEY_METHOD ec_pkey_meth = {
	529	EVP_PKEY_EC,
4e664750	530	0,
0f113f3e MC	531	pkey_ec_init,
	532	pkey_ec_copy,
	533	pkey_ec_cleanup,
	534
	535	0,
	536	pkey_ec_paramgen,
	537
	538	0,
	539	pkey_ec_keygen,
	540
	541	0,
	542	pkey_ec_sign,
	543
	544	0,
	545	pkey_ec_verify,
	546
	547	0, 0,
	548
	549	0, 0, 0, 0,
	550
dceb99a5 JL	551	0,
dceb99a5 JL	552	pkey_ecies_encrypt,
0f113f3e	553
dceb99a5 JL	554	0,
dceb99a5 JL	555	pkey_ecies_decrypt,
0f113f3e MC	556
0f113f3e MC	557	0,
10bf4fc2	558	#ifndef OPENSSL_NO_EC
0f113f3e	559	pkey_ec_kdf_derive,
af6e2d51	560	#else
0f113f3e	561	0,
af6e2d51	562	#endif
0f113f3e MC	563	pkey_ec_ctrl,
	564	pkey_ec_ctrl_str
	565	};