/*

 * Copyright 2017-2018 The OpenSSL Project Authors. All Rights Reserved.

 * Copyright 2017 Ribose Inc. All Rights Reserved.

 * Ported from Ribose contributions from Botan.

 *

 * 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

 */

#ifndef OSSL_CRYPTO_SM2_H

# define OSSL_CRYPTO_SM2_H

# include <openssl/opensslconf.h>

# ifndef OPENSSL_NO_SM2

#  include <openssl/ec.h>

/* The default user id as specified in GM/T 0009-2012 */

#  define SM2_DEFAULT_USERID "1234567812345678"

int sm2_compute_z_digest(uint8_t *out,

                         const EVP_MD *digest,

                         const uint8_t *id,

                         const size_t id_len,

                         const EC_KEY *key);

/*

 * SM2 signature operation. Computes Z and then signs H(Z || msg) using SM2

 */

ECDSA_SIG *sm2_do_sign(const EC_KEY *key,

                       const EVP_MD *digest,

                       const uint8_t *id,

                       const size_t id_len,

                       const uint8_t *msg, size_t msg_len);

int sm2_do_verify(const EC_KEY *key,

                  const EVP_MD *digest,

                  const ECDSA_SIG *signature,

                  const uint8_t *id,

                  const size_t id_len,

                  const uint8_t *msg, size_t msg_len);

/*

 * SM2 signature generation.

 */

int sm2_sign(const unsigned char *dgst, int dgstlen,

             unsigned char *sig, unsigned int *siglen, EC_KEY *eckey);

/*

 * SM2 signature verification.

 */

int sm2_verify(const unsigned char *dgst, int dgstlen,

               const unsigned char *sig, int siglen, EC_KEY *eckey);

/*

 * SM2 encryption

 */

int sm2_ciphertext_size(const EC_KEY *key, const EVP_MD *digest, size_t msg_len,

                        size_t *ct_size);

int sm2_plaintext_size(const EC_KEY *key, const EVP_MD *digest, size_t msg_len,

                       size_t *pt_size);

int sm2_encrypt(const EC_KEY *key,

                const EVP_MD *digest,

                const uint8_t *msg,

                size_t msg_len,

                uint8_t *ciphertext_buf, size_t *ciphertext_len);

int sm2_decrypt(const EC_KEY *key,

                const EVP_MD *digest,

                const uint8_t *ciphertext,

                size_t ciphertext_len, uint8_t *ptext_buf, size_t *ptext_len);

# endif /* OPENSSL_NO_SM2 */

#endif