internal-xoodoo.h

/*
 * Copyright (C) 2021 Southern Storm Software, Pty Ltd.
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#ifndef LW_INTERNAL_XOODOO_H
#define LW_INTERNAL_XOODOO_H

#include "internal-util.h"

/**
 * \file internal-xoodoo.h
 * \brief Internal implementation of the Xoodoo permutation.
 *
 * References: https://keccak.team/xoodyak.html
 */

#ifdef __cplusplus
extern "C" {
#endif

/**
 * \brief Number of rows in the Xoodoo state.
 */
#define XOODOO_ROWS 3

/**
 * \brief Number of columns in the Xoodoo state.
 */
#define XOODOO_COLS 4

/**
 * \brief Number of rounds for the Xoodoo permutation.
 */
#define XOODOO_ROUNDS 12

/**
 * \brief State information for the Xoodoo permutation.
 */
typedef union
{
    /** Words of the state organized into rows and columns */
    uint32_t S[XOODOO_ROWS][XOODOO_COLS];

    /** Words of the state as a single linear array */
    uint32_t W[XOODOO_ROWS * XOODOO_COLS];

    /** Bytes of the state */
    uint8_t B[XOODOO_ROWS * XOODOO_COLS * sizeof(uint32_t)];

} xoodoo_state_t;

/**
 * \brief Permutes the Xoodoo state.
 *
 * \param state The Xoodoo state.
 *
 * The state will be in little-endian before and after the operation.
 */
void xoodoo_permute(xoodoo_state_t *state);

#ifdef __cplusplus
}
#endif

#endif