/*-
 * Copyright (c) 2018-2025 Ribose Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef RNP_MPI_HPP_
#define RNP_MPI_HPP_

#include <cstdint>
#include <cstddef>
#include <vector>

/* 16384 bits should be pretty enough for now */
#define PGP_MPINT_BITS (16384)
#define PGP_MPINT_SIZE (PGP_MPINT_BITS >> 3)

/** multi-precision integer, used in signatures and public/secret keys */
namespace pgp {

class mpi {
    std::vector<uint8_t> data_;

  public:
    bool           operator==(const mpi &src) const;
    bool           operator!=(const mpi &src) const;
    uint8_t &      operator[](size_t idx);
    const uint8_t &operator[](size_t idx) const;

    void assign(const uint8_t *val, size_t size);
    void copy(uint8_t *dst) const noexcept;
    void resize(size_t size, uint8_t fill = 0);
    void forget() noexcept;

    uint8_t *      data() noexcept;
    const uint8_t *data() const noexcept;
    size_t         size() const noexcept;
    size_t         bits() const noexcept;
};

} // namespace pgp

#endif // MPI_HPP_