internal-photon256.h

/*
 * Copyright (C) 2021 Southern Storm Software, Pty Ltd.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
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 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
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 *
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 */

#ifndef LW_INTERNAL_PHOTON256_H
#define LW_INTERNAL_PHOTON256_H

/**
 * \file internal-photon256.h
 * \brief Internal implementation of the PHOTON-256 permutation.
 */

#include "internal-util.h"

#ifdef __cplusplus
extern "C" {
#endif

/**
 * \brief Size of the PHOTON-256 permutation state in bytes.
 */
#define PHOTON256_STATE_SIZE 32

/**
 * \brief Structure of the internal state of the PHOTON-256 permutation.
 */
typedef union
{
    uint32_t W[PHOTON256_STATE_SIZE / 4];   /**< 32-bit words of the state */
    uint8_t B[PHOTON256_STATE_SIZE];        /**< Bytes of the state */

} photon256_state_t;

/**
 * \brief Permutes the PHOTON-256 state.
 *
 * \param state The state to be permuted.
 */
void photon256_permute(photon256_state_t *state);

#ifdef __cplusplus
}
#endif

#endif