GmSSL/crypto/sm2/sm2_kmeth.c

/*
 * Copyright (c) 2016 The GmSSL 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 GmSSL Project.
 *    (http://gmssl.org/)"
 *
 * 4. The name "GmSSL Project" must not be used to endorse or promote
 *    products derived from this software without prior written
 *    permission. For written permission, please contact
 *    guanzhi1980@gmail.com.
 *
 * 5. Products derived from this software may not be called "GmSSL"
 *    nor may "GmSSL" appear in their names without prior written
 *    permission of the GmSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the GmSSL Project
 *    (http://gmssl.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE GmSSL 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 GmSSL 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.
 */

#include <string.h>
#include <openssl/ec.h>
#include <openssl/engine.h>
#include <openssl/err.h>
#include <openssl/sm2.h>
#include <openssl/ecies.h>
#include "../ec/ec_lcl.h"

#define SM2_KMETH_FLAGS		0

int SM2_ENC_PARAMS_set_type(SM2_ENC_PARAMS *params, int type)
{
	// FIXME:
	ECerr(EC_F_SM2_ENC_PARAMS_SET_TYPE, ERR_R_EVP_LIB);
	return 0;
}

SM2_CIPHERTEXT_VALUE *SM2_CIPHERTEXT_VALUE_new_from_ECIES_CIPHERTEXT_VALUE(
	const ECIES_CIPHERTEXT_VALUE *in)
{
	ECerr(EC_F_SM2_CIPHERTEXT_VALUE_NEW_FROM_ECIES_CIPHERTEXT_VALUE,
		ERR_R_EC_LIB);
	return NULL;
}

int SM2_CIPHERTEXT_VALUE_set_ECIES_CIPHERTEXT_VALUE(SM2_CIPHERTEXT_VALUE *sm2,
	const ECIES_CIPHERTEXT_VALUE *in)
{
	ECerr(EC_F_SM2_CIPHERTEXT_VALUE_SET_ECIES_CIPHERTEXT_VALUE,
		ERR_R_EC_LIB);
	return 0;
}

int SM2_CIPHERTEXT_VALUE_get_ECIES_CIPHERTEXT_VALUE(
	const SM2_CIPHERTEXT_VALUE *sm2, ECIES_CIPHERTEXT_VALUE *out)
{
	ECerr(EC_F_SM2_CIPHERTEXT_VALUE_GET_ECIES_CIPHERTEXT_VALUE,
		ERR_R_EC_LIB);
	return 0;
}

static int sm2_compute_key(unsigned char **Pout, size_t *poutlen,
	const EC_POINT *pub_key, const EC_KEY *ec_key)
{
	return 0;
}

static int sm2_encrypt(int type, const unsigned char *in, size_t inlen,
	unsigned char *out, size_t *outlen, EC_KEY *ec_key)
{
	SM2_ENC_PARAMS param;
	if (!SM2_ENC_PARAMS_set_type(&param, type)) {
		return 0;
	}
	return SM2_encrypt(&param, in, inlen, out, outlen, ec_key);
}

ECIES_CIPHERTEXT_VALUE *sm2_do_encrypt(int type, const unsigned char *in,
	size_t inlen, EC_KEY *ec_key)
{
	ECIES_CIPHERTEXT_VALUE *ret = NULL;
	ECIES_CIPHERTEXT_VALUE *ecies = NULL;
	SM2_CIPHERTEXT_VALUE *sm2 = NULL;
	SM2_ENC_PARAMS param;

	if (!(ecies = ECIES_CIPHERTEXT_VALUE_new())) {
		goto end;
	}
	if (!SM2_ENC_PARAMS_set_type(&param, type)) {
		goto end;
	}
	if (!(sm2 = SM2_do_encrypt(&param, in, inlen, ec_key))) {
		goto end;
	}
	if (!SM2_CIPHERTEXT_VALUE_get_ECIES_CIPHERTEXT_VALUE(sm2, ecies)) {
		goto end;
	}

	ret = ecies;
	ecies = NULL;

end:
	ECIES_CIPHERTEXT_VALUE_free(ecies);
	SM2_CIPHERTEXT_VALUE_free(sm2);
	return ret;
}

int sm2_decrypt(int type, const unsigned char *in, size_t inlen,
	unsigned char *out, size_t *outlen, EC_KEY *ec_key)
{
	SM2_ENC_PARAMS param;
	if (!SM2_ENC_PARAMS_set_type(&param, type)) {
		return 0;
	}
	return SM2_decrypt(&param, in, inlen, out, outlen, ec_key);
}

int sm2_do_decrypt(int type, const ECIES_CIPHERTEXT_VALUE *in,
	unsigned char *out, size_t *outlen, EC_KEY *ec_key)
{
	int ret = 0;
	SM2_CIPHERTEXT_VALUE *sm2 = NULL;
	SM2_ENC_PARAMS param;

	if (!SM2_ENC_PARAMS_set_type(&param, type)) {
		goto end;
	}
	// we might require type/param
	if (!(sm2 = SM2_CIPHERTEXT_VALUE_new_from_ECIES_CIPHERTEXT_VALUE(in))) {
		goto end;
	}
	if (!SM2_do_decrypt(&param, sm2, out, outlen, ec_key)) {
		goto end;
	}

	ret = 1;
end:
	SM2_CIPHERTEXT_VALUE_free(sm2);
	return ret;
}

static const EC_KEY_METHOD gmssl_ec_key_method = {
	"GmSSL EC_KEY method",
	0,
	0,0,0,0,0,0,
	ossl_ec_key_gen,
	sm2_compute_key,
	SM2_sign,
	SM2_sign_setup,
	SM2_do_sign,
	SM2_verify,
	SM2_do_verify,
	sm2_encrypt,
	sm2_do_encrypt,
	sm2_decrypt,
	sm2_do_decrypt,
};

const EC_KEY_METHOD *EC_KEY_GmSSL(void)
{
    return &gmssl_ec_key_method;
}