ECCParams.h

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#ifndef ti_drivers_cryptoutils_ecc_ECCParams__include
#define ti_drivers_cryptoutils_ecc_ECCParams__include

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

#include <ti/drivers/cryptoutils/cryptokey/CryptoKey.h>
#include <ti/devices/DeviceFamily.h>

#ifdef __cplusplus
extern "C" {
#endif

/* Error status codes for the utility functions */

#define ECCParams_STATUS_SUCCESS         (0)

#define ECCParams_STATUS_ERROR           (-1)

typedef uint32_t ECCParams_CurveType;

#define ECCParams_CURVE_TYPE_NONE 0U
#define ECCParams_CURVE_TYPE_SHORT_WEIERSTRASS_AN3 1U
#define ECCParams_CURVE_TYPE_SHORT_WEIERSTRASS_GEN 2U
#define ECCParams_CURVE_TYPE_MONTGOMERY 3U
#define ECCParams_CURVE_TYPE_EDWARDS 4U

typedef struct ECCParams_CurveParams {
    const ECCParams_CurveType   curveType;
    const uint8_t               *prime;
    const uint8_t               *a;
    const uint8_t               *b;
    const uint8_t               *order;
    uint8_t                     cofactor;
    const size_t                length;
    const uint8_t               *generatorX;
    const uint8_t               *generatorY;
} ECCParams_CurveParams;



/* Short Weierstrass curves */

extern const ECCParams_CurveParams ECCParams_NISTP224;

extern const ECCParams_CurveParams ECCParams_NISTP256;

extern const ECCParams_CurveParams ECCParams_NISTP384;

extern const ECCParams_CurveParams ECCParams_NISTP521;

extern const ECCParams_CurveParams ECCParams_BrainpoolP256R1;

extern const ECCParams_CurveParams ECCParams_BrainpoolP384R1;

extern const ECCParams_CurveParams ECCParams_BrainpoolP512R1;

extern const ECCParams_CurveParams ECCParams_Wei25519;

/* Montgomery curves */

extern const ECCParams_CurveParams ECCParams_Curve25519;

/* Edwards curves */

extern const ECCParams_CurveParams ECCParams_Ed25519;

#define ECC_LENGTH_PREFIX_BYTES 4

#if (DeviceFamily_PARENT == DeviceFamily_PARENT_CC23X0)

#define ECCParams_NISTP256_LENGTH 32

#define ECC_NISTP256_PARAM_LENGTH_WITH_PREFIX_BYTES   (ECCParams_NISTP256_LENGTH + ECC_LENGTH_PREFIX_BYTES)

typedef union {
    uint8_t     byte[ECC_NISTP256_PARAM_LENGTH_WITH_PREFIX_BYTES];
    uint32_t    word[ECC_NISTP256_PARAM_LENGTH_WITH_PREFIX_BYTES / sizeof(uint32_t)];
} ECC_NISTP256_Param;

extern const ECC_NISTP256_Param ECC_NISTP256_generatorX;

extern const ECC_NISTP256_Param ECC_NISTP256_generatorY;

extern const ECC_NISTP256_Param ECC_NISTP256_prime;

extern const ECC_NISTP256_Param ECC_NISTP256_a;

extern const ECC_NISTP256_Param ECC_NISTP256_b;

extern const ECC_NISTP256_Param ECC_NISTP256_order;

extern const ECC_NISTP256_Param ECC_NISTP256_k_mont;

extern const ECC_NISTP256_Param ECC_NISTP256_a_mont;

extern const ECC_NISTP256_Param ECC_NISTP256_b_mont;
 /* end of nistp256_params */

#endif /* DeviceFamily_PARENT == DeviceFamily_PARENT_CC23X0 */

#define ECCParams_CURVE25519_LENGTH 32

#define ECC_CURVE25519_LENGTH_WITH_PREFIX_BYTES   (ECCParams_CURVE25519_LENGTH + ECC_LENGTH_PREFIX_BYTES)

typedef union {
    uint8_t   byte[ECC_CURVE25519_LENGTH_WITH_PREFIX_BYTES];
    uint32_t  word[ECC_CURVE25519_LENGTH_WITH_PREFIX_BYTES / sizeof(uint32_t)];
} ECC_Curve25519_Param;

extern const ECC_Curve25519_Param ECC_Curve25519_generatorX;

extern const ECC_Curve25519_Param ECC_Curve25519_generatorY;

extern const ECC_Curve25519_Param ECC_Curve25519_prime;

extern const ECC_Curve25519_Param ECC_Curve25519_a;

extern const ECC_Curve25519_Param ECC_Curve25519_b;

extern const ECC_Curve25519_Param ECC_Curve25519_order;
 /* end of curve25519_params */


/* Utility functions */

/* #define used for backwards compatibility */
#define ECCParams_FormatCurve25519PrivateKey ECCParams_formatCurve25519PrivateKey

int_fast16_t ECCParams_formatCurve25519PrivateKey(CryptoKey *myPrivateKey);

int_fast16_t ECCParams_getUncompressedGeneratorPoint(const ECCParams_CurveParams *curveParams,
                                                     uint8_t *buffer,
                                                     size_t length);

#ifdef __cplusplus
}
#endif

#endif /* ti_drivers_cryptoutils_ecc_ECCParams__include */