/***********************************************************************
 * Copyright (c) 2020 Peter Dettman                                    *
 * Distributed under the MIT software license, see the accompanying    *
 * file COPYING or https://www.opensource.org/licenses/mit-license.php.*
 **********************************************************************/

#ifndef SECP256K1_MODINV64_H
#define SECP256K1_MODINV64_H

#if defined HAVE_CONFIG_H
#include "libsecp256k1-config.h"
#endif

#include "util.h"

#ifndef SECP256K1_WIDEMUL_INT128
#error "modinv64 requires 128-bit wide multiplication support"
#endif

typedef struct {
    int64_t v[5];
} secp256k1_modinv64_signed62;

typedef struct {
    /* The modulus in signed62 notation. */
    secp256k1_modinv64_signed62 modulus;

    /* modulus^{-1} mod 2^62 */
    uint64_t modulus_inv62;
} secp256k1_modinv64_modinfo;

static void secp256k1_modinv64(secp256k1_modinv64_signed62 *x, const secp256k1_modinv64_modinfo *modinfo);
static void secp256k1_modinv64_var(secp256k1_modinv64_signed62 *x, const secp256k1_modinv64_modinfo *modinfo);

#endif /* SECP256K1_MODINV64_H */