internal-gift128-config.h

/*
 * Copyright (C) 2020 Southern Storm Software, Pty Ltd.
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#ifndef LW_INTERNAL_GIFT128_CONFIG_H
#define LW_INTERNAL_GIFT128_CONFIG_H

/**
 * \file internal-gift128-config.h
 * \brief Configures the variant of GIFT-128 to use.
 */

/**
 * \brief Select the full variant of GIFT-128.
 *
 * The full variant requires 320 bytes for the key schedule and uses the
 * fixslicing method to implement encryption and decryption.
 */
#define GIFT128_VARIANT_FULL    0

/**
 * \brief Select the small variant of GIFT-128.
 *
 * The small variant requires 80 bytes for the key schedule.  The rest
 * of the key schedule is expanded on the fly during encryption.
 *
 * The fixslicing method is used to implement encryption and the slower
 * bitslicing method is used to implement decryption.  The small variant
 * is suitable when memory is at a premium, decryption is not needed,
 * but encryption performance is still important.
 */
#define GIFT128_VARIANT_SMALL   1

/**
 * \brief Select the tiny variant of GIFT-128.
 *
 * The tiny variant requires 16 bytes for the key schedule and uses the
 * bitslicing method to implement encryption and decryption.  It is suitable
 * for use when memory is very tight and performance is not critical.
 */
#define GIFT128_VARIANT_TINY    2

/**
 * \def GIFT128_VARIANT
 * \brief Selects the default variant of GIFT-128 to use on this platform.
 */
/**
 * \def GIFT128_VARIANT_ASM
 * \brief Defined to 1 if the GIFT-128 implementation has been replaced
 * with an assembly code version.
 */
#if defined(__AVR__) && !defined(GIFT128_VARIANT_ASM)
#define GIFT128_VARIANT_ASM 1
#endif
#if !defined(GIFT128_VARIANT)
#define GIFT128_VARIANT GIFT128_VARIANT_FULL
#endif
#if !defined(GIFT128_VARIANT_ASM)
#define GIFT128_VARIANT_ASM 0
#endif

#endif