/* crypto/ecies/ecies.h */
/* ====================================================================
 * Copyright (c) 2007 - 2015 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
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 *    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
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 *    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.
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 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the GmSSL Project
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 *
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 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 * ====================================================================
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 */


#ifndef HEADER_ECIES_H
#define HEADER_ECIES_H

#include <openssl/ec.h>
#include <openssl/err.h>
#include <openssl/evp.h>
#include <openssl/x509.h>
#include <openssl/asn1.h>

#ifdef __cplusplus
extern "C" {
#endif


/*
 KDFSet ALGORITHM ::= {
	{ OID x9-63-kdf PARMS HashAlgorithm } |
	{ OID nist-concatenation-kdf PARMS HashAlgorithm } | 
	{ OID tls-kdf PARMS HashAlgorithm } |
	{ OID ikev2-kdf PARMS HashAlgorithm }
 }
*/

typedef struct ecies_params_st {
	/* supported kdf algors:
	 *   x9-63-kdf
	 *   nist-concatenation-kdf
         *   tls-kdf
         *   ikev2-kdf
	 */
	int kdf_nid;
	const EVP_MD        *kdf_md;

	/* supported enc algors:
	 *   xor-in-ecies
         *   aes128-cbc-in-ecies
	 *   aes192-cbc-in-ecies
	 *   aes256-cbc-in-ecies
	 *   aes128-ctr-in-ecies
	 *   aes192-ctr-in-ecies
	 *   aes256-ctr-in-ecies
         */
	const EVP_CIPHER    *sym_cipher;

	/*
	 * supported mac algors:
	 *   hmac-full-ecies
	 *   hmac-half-ecies
	 *   cmac-aes128-ecies
	 *   cmac-aes192-ecies
	 */
	int mac_nid;
	const EVP_MD *mac_md;
	const EVP_CIPHER *mac_cipher;
} ECIES_PARAMS;

typedef struct ecies_ciphertext_value_st {
	ASN1_OCTET_STRING   *ephem_point;
	ASN1_OCTET_STRING   *ciphertext;
	ASN1_OCTET_STRING   *mactag;
} ECIES_CIPHERTEXT_VALUE;

DECLARE_ASN1_FUNCTIONS(ECIES_CIPHERTEXT_VALUE)

int i2d_ECIESParameters(const ECIES_PARAMS *param, unsigned char **out);
ECIES_PARAMS *d2i_ECIESParameters(ECIES_PARAMS **param, const unsigned char **in, long len);

int ECIES_set_parameters(EC_KEY *ec_key, const ECIES_PARAMS *param);
ECIES_PARAMS *ECIES_get_parameters(EC_KEY *ec_key);
ECIES_CIPHERTEXT_VALUE *ECIES_do_encrypt(const ECIES_PARAMS *param,
	const unsigned char *in, size_t inlen, EC_KEY *ec_key);
int ECIES_do_decrypt(const ECIES_CIPHERTEXT_VALUE *cv,
	const ECIES_PARAMS *param, unsigned char *out, size_t *outlen, 
	EC_KEY *ec_key);
int ECIES_encrypt(const ECIES_PARAMS *param,
	unsigned char *out, size_t *outlen,
	const unsigned char *in, size_t inlen,
	EC_KEY *ec_key);
int ECIES_decrypt(const ECIES_PARAMS *param,
	unsigned char *out, size_t *outlen,
	const unsigned char *in, size_t inlen,
	EC_KEY *ec_key);
int ECIES_encrypt_with_recommended(unsigned char *out, size_t *outlen,
	const unsigned char *in, size_t inlen,
	EC_KEY *ec_key);
int ECIES_decrypt_with_recommended(unsigned char *out, size_t *outlen,
	const unsigned char *in, size_t inlen,
	EC_KEY *ec_key);


void ERR_load_ECIES_strings(void);


/* BEGIN ERROR CODES */
/*
 * The following lines are auto generated by the script mkerr.pl. Any changes
 * made after this point may be overwritten when the script is next run.
 */
void ERR_load_ECIES_strings(void);

/* Error codes for the ECIES functions. */

/* Function codes. */
# define ECIES_F_D2I_ECIESPARAMETERS                      100
# define ECIES_F_ECIES_DECRYPT                            101
# define ECIES_F_ECIES_DO_DECRYPT                         102
# define ECIES_F_ECIES_DO_ENCRYPT                         103
# define ECIES_F_ECIES_ENCRYPT                            104
# define ECIES_F_I2D_ECIESPARAMETERS                      105

/* Reason codes. */
# define ECIES_R_BAD_DATA                                 100
# define ECIES_R_BUFFER_TOO_SMALL                         101
# define ECIES_R_DECRYPT_FAILED                           102
# define ECIES_R_ECDH_FAILED                              103
# define ECIES_R_ENCRYPT_FAILED                           104
# define ECIES_R_GEN_MAC_FAILED                           105
# define ECIES_R_VERIFY_MAC_FAILED                        106

#ifdef  __cplusplus
}
#endif
#endif