internal-cham.h

/*
 * Copyright (C) 2020 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
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * 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
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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 * DEALINGS IN THE SOFTWARE.
 */

#ifndef LW_INTERNAL_CHAM_H
#define LW_INTERNAL_CHAM_H

/**
 * \file internal-cham.h
 * \brief CHAM block cipher.
 */

#ifdef __cplusplus
extern "C" {
#endif

/**
 * \brief Encrypts a 128-bit block with CHAM-128-128.
 *
 * \param key Points to the 16 bytes of the key.
 * \param output Output buffer which must be at least 16 bytes in length.
 * \param input Input buffer which must be at least 16 bytes in length.
 *
 * The \a input and \a output buffers can be the same buffer for
 * in-place encryption.
 */
void cham128_128_encrypt
    (const unsigned char *key, unsigned char *output,
     const unsigned char *input);

/**
 * \brief Encrypts a 64-bit block with CHAM-64-128.
 *
 * \param key Points to the 16 bytes of the key.
 * \param output Output buffer which must be at least 8 bytes in length.
 * \param input Input buffer which must be at least 8 bytes in length.
 *
 * The \a input and \a output buffers can be the same buffer for
 * in-place encryption.
 */
void cham64_128_encrypt
    (const unsigned char *key, unsigned char *output,
     const unsigned char *input);

#ifdef __cplusplus
}
#endif

#endif