#if !defined( _ECC_H )
#define _ECC_H

#include <openssl/bn.h>

/*
 * If the "neg" field of the BIGNUM struct is set, then this point is
 * the identity.  This is a terrible way to do this, since it's not
 * clear what the future of this flag is -- however, for now it works,
 * and it's fast...
 */

typedef struct eccpt_st {
	BIGNUM *x, *y;
} ECCpt;

typedef struct eccparam_st {
	BIGNUM *modulus;	/* Curve is over Z_modulus */
	BIGNUM *a, *b;		/* Curve coefficients */
	ECCpt generator;	/* Generator for our operations */
	ECCpt pubkey;		/* Public key */
	BIGNUM *privkey;	/* Corresponding private key */
} ECC;


ECC *ECC_new_set(BIGNUM * p, BIGNUM * a, BIGNUM * b, ECCpt g);
void ECC_free(ECC * ecc);
void ECCpt_init(ECCpt * pt);
void ECCpt_free(ECCpt * pt);
int ECCpt_is_valid_pt(ECCpt * a, ECC * ecc);
int ECCpt_is_equal(ECCpt * a, ECCpt * b);
void ECCpt_add(ECCpt * r, ECCpt * a, ECCpt * b, ECC * ecc);
void ECCpt_mul(ECCpt * r, ECCpt * a, BIGNUM * n, ECC * ecc);

#endif