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 * Copyright (c) 2017, Texas Instruments Incorporated
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/** ============================================================================
 *  @file       ECCParams.h
 *
 *  This file contains a common definition for eliptic curve structures used
 *  throughout the ECC based drivers.
 *
 *  Elliptic curves may be expressed in multiple ways. The most common ones are
 *  the short Weierstrass form y^3 = x^2 + a*x + b mod p, where a and b are integer
 *  curve parameters and p is the prime of the curve. Another commonly found form
 *  is the Montgomery form By^2 = x^3 + Ax^2 + x mod p, where B and A are integer
 *  curve parameters and p is the prime of the curve. The last common form is the
 *  Edwards form x^2 + y^2 = 1 + dx^2y^2 mod p, where d is an integer curve parameter
 *  and p is the prime of the curve.
 *
 *  This API expects curves in short Weierstrass form. The other curve expressions
 *  may be converted to short Weierstrass form using substitution.
 */

#ifndef ti_drivers_cryptoutils_ecc_ECCParams__include
#define ti_drivers_cryptoutils_ecc_ECCParams__include

#ifdef __cplusplus
extern "C" {
#endif

#include <stdint.h>
#include <stdbool.h>

/*!
 *
 *  @brief A structure containing the parameters of an elliptic curve in short Weierstrass form.
 *
 *  Elliptical Curve Cryptography (ECC) prime curve.
 *
 *  The equation used to define the curve is expressed in the short Weierstrass
 *  form y^3 = x^2 + a*x + b
 *
 */
typedef struct ECCParams_CurveParams_ {
    const size_t    length;         //!< Length of the curve in bytes. All other buffers have this length.
    const uint8_t   *prime;         //!< The prime that defines the field of the curve.
    const uint8_t   *order;         //!< Order of the curve.
    const uint8_t   *a;             //!< Coefficient a of the equation.
    const uint8_t   *b;             //!< Coefficient b of the equation.
    const uint8_t   *generatorX;    //!< X coordinate of the generator point of the curve.
    const uint8_t   *generatorY;    //!< Y coordinate of the generator point of the curve.
}
ECCParams_CurveParams;

/*!
 *
 *  @brief The NISTP256 curve in short Weierstrass form.
 *
 */
extern const ECCParams_CurveParams ECCParams_NISTP256;

#ifdef __cplusplus
}
#endif

#endif /* ti_drivers_cryptoutils_ecc_ECCParams__include */