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#ifndef HEADER_ECIES_H
#define HEADER_ECIES_H

#include <openssl/opensslconf.h>
#ifndef OPENSSL_NO_ECIES

#include <openssl/ec.h>
#include <openssl/err.h>
#include <openssl/evp.h>
#include <openssl/x509.h>
#include <openssl/asn1.h>
#include <openssl/kdf2.h>
#include <openssl/objects.h>

#ifdef __cplusplus
extern "C" {
#endif

/*
ECIESAlgorithmSet ALGORITHM ::= {
	{OID ecies-recommendedParameters} |
	{OID ecies-specifiedParameters PARMS ECIESParameters},
	... -- Future combinations may be added
	{OID ecies-with-x9-63-sha1-aes128-cbc-hmac}
	{OID ecies-with-x9-63-sha256-aes128-cbc-hmac}
	{OID ecies-with-x9-63-sha256-aes192-cbc-hmac}
	{OID ecies-with-x9-63-sha512-aes256-cbc-hmac}
	{OID ecies-with-x9-63-sha256-xor-hmac}
}
*/

typedef struct ecies_params_st {
	/*
	KDFSet ALGORITHM ::= {
		{ OID x9-63-kdf PARMS HashAlgorithm } |
		{ OID nist-concatenation-kdf PARMS HashAlgorithm } |
		{ OID tls-kdf PARMS HashAlgorithm } |
		{ OID ikev2-kdf PARMS HashAlgorithm }
		... -- Future combinations may be added
	}
	*/
	int kdf_nid;
	const EVP_MD *kdf_md;

	/*
	SYMENCSet ALGORITHM ::= {
		{ OID xor-in-ecies } |
		{ OID tdes-cbc-in-ecies } |
		{ OID aes128-cbc-in-ecies } |
		{ OID aes192-cbc-in-ecies } |
		{ OID aes256-cbc-in-ecies } |
		{ OID aes128-ctr-in-ecies } |
		{ OID aes192-ctr-in-ecies } |
		{ OID aes256-ctr-in-ecies } ,
		... -- Future combinations may be added
	}
	*/
	int enc_nid;

	/*
	MACSet ALGORITHM ::= {
		{ OID hmac-full-ecies PARMS HashAlgorithm} |
		{ OID hmac-half-ecies PARMS HashAlgorithm} |
		{ OID cmac-aes128-ecies } |
		{ OID cmac-aes192-ecies } |
		{ OID cmac-aes256-ecies } ,
		... -- Future combinations may be added
	}
	*/
	int mac_nid;
	const EVP_MD *hmac_md;

} ECIES_PARAMS;

int ECIES_PARAMS_init_with_recommended(ECIES_PARAMS *param);
int ECIES_PARAMS_init_with_type(ECIES_PARAMS *param, int type);
KDF_FUNC ECIES_PARAMS_get_kdf(const ECIES_PARAMS *param);
int ECIES_PARAMS_get_enc(const ECIES_PARAMS *param, size_t inlen,
	const EVP_CIPHER **enc_cipher, size_t *enckeylen, size_t *ciphertextlen);
int ECIES_PARAMS_get_mac(const ECIES_PARAMS *param,
	const EVP_MD **hmac_md, const EVP_CIPHER **cmac_cipher,
	unsigned int *mackeylen, unsigned int *maclen);

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

typedef struct ecies_ciphertext_value_st ECIES_CIPHERTEXT_VALUE;
DECLARE_ASN1_FUNCTIONS(ECIES_CIPHERTEXT_VALUE)

int ECIES_CIPHERTEXT_VALUE_ciphertext_length(const ECIES_CIPHERTEXT_VALUE *a);

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_PARAMS *param, const ECIES_CIPHERTEXT_VALUE *in,
	unsigned char *out, size_t *outlen, EC_KEY *ec_key);
int ECIES_encrypt(int param, const unsigned char *in, size_t inlen,
	unsigned char *out, size_t *outlen, EC_KEY *ec_key);
int ECIES_decrypt(int param, const unsigned char *in, size_t inlen,
	unsigned char *out, size_t *outlen, EC_KEY *ec_key);
#define ECIES_encrypt_with_recommended(in,inlen,out,outlen,ec_key) \
	ECIES_encrypt(NID_ecies_with_x9_63_sha256_xor_hmac,in,inlen,out,outlen,ec_key)
#define ECIES_decrypt_with_recommended(in,inlen,out,outlen,ec_key) \
	ECIES_decrypt(NID_ecies_with_x9_63_sha256_xor_hmac,in,inlen,out,outlen,ec_key)


#ifdef __cplusplus
}
#endif
#endif
#endif