/src/libfcrypto/libfcrypto/libfcrypto_serpent_context.c

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/*
 * Serpent (de/en)crypt functions
 *
 * Copyright (C) 2017-2024, Joachim Metz <joachim.metz@gmail.com>
 *
 * Refer to AUTHORS for acknowledgements.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

#include <common.h>
#include <byte_stream.h>
#include <memory.h>
#include <types.h>

#include "libfcrypto_definitions.h"
#include "libfcrypto_serpent_context.h"

/* Serpent
 *
 * http://www.cl.cam.ac.uk/~rja14/Papers/serpent.pdf
 */
#define libfcrypto_serpent_calculate_forward_linear_transformation( expanded_key_values, expanded_key_index, value0, value1, value2, value3, value4 ) \
  value0  = byte_stream_bit_rotate_left_32bit( value0, 13 ); \
  value2  = byte_stream_bit_rotate_left_32bit( value2, 3 ); \
  value1 ^= value0; \
  value4  = value0 << 3; \
  value3 ^= value2; \
  value1 ^= value2; \
  value1  = byte_stream_bit_rotate_left_32bit( value1, 1 ); \
  value3 ^= value4; \
  value3  = byte_stream_bit_rotate_left_32bit( value3, 7 ); \
  value4  = value1; \
  value0 ^= value1; \
  value4 <<= 7; \
  value2 ^= value3; \
  value0 ^= value3; \
  value2 ^= value4; \
  value3 ^= expanded_key_values[ expanded_key_index + 3 ]; \
  value1 ^= expanded_key_values[ expanded_key_index + 1 ]; \
  value0  = byte_stream_bit_rotate_left_32bit( value0, 5 ); \
  value2  = byte_stream_bit_rotate_left_32bit( value2, 22 ); \
  value0 ^= expanded_key_values[ expanded_key_index ]; \
  value2 ^= expanded_key_values[ expanded_key_index + 2 ];

#define libfcrypto_serpent_calculate_reverse_linear_transformation( expanded_key_values, expanded_key_index, value0, value1, value2, value3, value4 ) \
  value0 ^= expanded_key_values[ expanded_key_index ]; \
  value1 ^= expanded_key_values[ expanded_key_index + 1 ]; \
  value2 ^= expanded_key_values[ expanded_key_index + 2 ]; \
  \
  value3 ^= expanded_key_values[ expanded_key_index + 3 ];   \
  value0 = byte_stream_bit_rotate_right_32bit( value0, 5 ); \
  value2 = byte_stream_bit_rotate_right_32bit( value2, 22 ); \
  \
  value4 =  value1; \
  value2 ^= value3; \
  value0 ^= value3; \
  \
  value4 <<= 7; \
  value0 ^= value1; \
  value1 = byte_stream_bit_rotate_right_32bit( value1, 1 );  \
  value2 ^= value4; \
  value3 = byte_stream_bit_rotate_right_32bit( value3, 7 ); \
  value4 = value0 << 3; \
  \
  value1 ^= value0; \
  value3 ^= value4; \
  value0 = byte_stream_bit_rotate_right_32bit( value0, 13 ); \
  value1 ^= value2; \
  value3 ^= value2; \
  value2 = byte_stream_bit_rotate_right_32bit( value2, 3 );

#define libfcrypto_serpent_calculate_forward_substitution0( value0, value1, value2, value3, value4 ) \
  value4  = value3; \
  value3 |= value0; \
  value0 ^= value4; \
  value4 ^= value2; \
  value4  = ~value4; \
  value3 ^= value1; \
  value1 &= value0; \
  value1 ^= value4; \
  value2 ^= value0; \
  value0 ^= value3; \
  value4 |= value0; \
  value0 ^= value2; \
  value2 &= value1; \
  value3 ^= value2; \
  value1  = ~value1; \
  value2 ^= value4; \
  value1 ^= value2;

#define libfcrypto_serpent_calculate_forward_substitution1( value0, value1, value2, value3, value4 ) \
  value4  = value1; \
  value1 ^= value0; \
  value0 ^= value3; \
  value3  = ~value3; \
  value4 &= value1; \
  value0 |= value1; \
  value3 ^= value2; \
  value0 ^= value3; \
  value1 ^= value3; \
  value3 ^= value4; \
  value1 |= value4; \
  value4 ^= value2; \
  value2 &= value0; \
  value2 ^= value1; \
  value1 |= value0; \
  value0  = ~value0; \
  value0 ^= value2; \
  value4 ^= value1;

#define libfcrypto_serpent_calculate_forward_substitution2( value0, value1, value2, value3, value4 ) \
  value3  = ~value3; \
  value1 ^= value0; \
  value4  = value0; \
  value0 &= value2; \
  value0 ^= value3; \
  value3 |= value4; \
  value2 ^= value1; \
  value3 ^= value1; \
  value1 &= value0; \
  value0 ^= value2; \
  value2 &= value3; \
  value3 |= value1; \
  value0  = ~value0; \
  value3 ^= value0; \
  value4 ^= value0; \
  value0 ^= value2; \
  value1 |= value2;

#define libfcrypto_serpent_calculate_forward_substitution3( value0, value1, value2, value3, value4 ) \
  value4  = value1; \
  value1 ^= value3; \
  value3 |= value0; \
  value4 &= value0; \
  value0 ^= value2; \
  value2 ^= value1; \
  value1 &= value3; \
  value2 ^= value3; \
  value0 |= value4; \
  value4 ^= value3; \
  value1 ^= value0; \
  value0 &= value3; \
  value3 &= value4; \
  value3 ^= value2; \
  value4 |= value1; \
  value2 &= value1; \
  value4 ^= value3; \
  value0 ^= value3; \
  value3 ^= value2;

#define libfcrypto_serpent_calculate_forward_substitution4( value0, value1, value2, value3, value4 ) \
  value4  = value3; \
  value3 &= value0; \
  value0 ^= value4; \
  value3 ^= value2; \
  value2 |= value4; \
  value0 ^= value1; \
  value4 ^= value3; \
  value2 |= value0; \
  value2 ^= value1; \
  value1 &= value0; \
  value1 ^= value4; \
  value4 &= value2; \
  value2 ^= value3; \
  value4 ^= value0; \
  value3 |= value1; \
  value1  = ~value1; \
  value3 ^= value0;

#define libfcrypto_serpent_calculate_forward_substitution5( value0, value1, value2, value3, value4 ) \
  value4  = value1; \
  value1 |= value0; \
  value2 ^= value1; \
  value3  = ~value3; \
  value4 ^= value0; \
  value0 ^= value2; \
  value1 &= value4; \
  value4 |= value3; \
  value4 ^= value0; \
  value0 &= value3; \
  value1 ^= value3; \
  value3 ^= value2; \
  value0 ^= value1; \
  value2 &= value4; \
  value1 ^= value2; \
  value2 &= value0; \
  value3 ^= value2;

#define libfcrypto_serpent_calculate_forward_substitution6( value0, value1, value2, value3, value4 ) \
  value4  = value1; \
  value3 ^= value0; \
  value1 ^= value2; \
  value2 ^= value0; \
  value0 &= value3; \
  value1 |= value3; \
  value4  = ~value4; \
  value0 ^= value1; \
  value1 ^= value2; \
  value3 ^= value4; \
  value4 ^= value0; \
  value2 &= value0; \
  value4 ^= value1; \
  value2 ^= value3; \
  value3 &= value1; \
  value3 ^= value0; \
  value1 ^= value2;

#define libfcrypto_serpent_calculate_forward_substitution7( value0, value1, value2, value3, value4 ) \
  value1  = ~value1; \
  value4  = value1; \
  value0  = ~value0; \
  value1 &= value2; \
  value1 ^= value3; \
  value3 |= value4; \
  value4 ^= value2; \
  value2 ^= value3; \
  value3 ^= value0; \
  value0 |= value1; \
  value2 &= value0; \
  value0 ^= value4; \
  value4 ^= value3; \
  value3 &= value0; \
  value4 ^= value1; \
  value2 ^= value4; \
  value3 ^= value1; \
  value4 |= value0; \
  value4 ^= value1;

#define libfcrypto_serpent_calculate_reverse_substitution0( value0, value1, value2, value3, value4 ) \
  value4  = value3; \
  value1 ^= value0; \
  value3 |= value1; \
  value4 ^= value1; \
  value0  = ~value0; \
  value2 ^= value3; \
  value3 ^= value0; \
  value0 &= value1; \
  value0 ^= value2; \
  value2 &= value3; \
  value3 ^= value4; \
  value2 ^= value3; \
  value1 ^= value3; \
  value3 &= value0; \
  value1 ^= value0; \
  value0 ^= value2; \
  value4 ^= value3;

#define libfcrypto_serpent_calculate_reverse_substitution1( value0, value1, value2, value3, value4 ) \
  value1 ^= value3; \
  value4  = value0; \
  value0 ^= value2; \
  value2  = ~value2; \
  value4 |= value1; \
  value4 ^= value3; \
  value3 &= value1; \
  value1 ^= value2; \
  value2 &= value4; \
  value4 ^= value1; \
  value1 |= value3; \
  value3 ^= value0; \
  value2 ^= value0; \
  value0 |= value4; \
  value2 ^= value4; \
  value1 ^= value0; \
  value4 ^= value1;

#define libfcrypto_serpent_calculate_reverse_substitution2( value0, value1, value2, value3, value4 ) \
  value2 ^= value1; \
  value4  = value3; \
  value3  = ~value3; \
  value3 |= value2; \
  value2 ^= value4; \
  value4 ^= value0; \
  value3 ^= value1; \
  value1 |= value2; \
  value2 ^= value0; \
  value1 ^= value4; \
  value4 |= value3; \
  value2 ^= value3; \
  value4 ^= value2; \
  value2 &= value1; \
  value2 ^= value3; \
  value3 ^= value4; \
  value4 ^= value0;

#define libfcrypto_serpent_calculate_reverse_substitution3( value0, value1, value2, value3, value4 ) \
  value2 ^= value1; \
  value4  = value1; \
  value1 &= value2; \
  value1 ^= value0; \
  value0 |= value4; \
  value4 ^= value3; \
  value0 ^= value3; \
  value3 |= value1; \
  value1 ^= value2; \
  value1 ^= value3; \
  value0 ^= value2; \
  value2 ^= value3; \
  value3 &= value1; \
  value1 ^= value0; \
  value0 &= value2; \
  value4 ^= value3; \
  value3 ^= value0; \
  value0 ^= value1;

#define libfcrypto_serpent_calculate_reverse_substitution4( value0, value1, value2, value3, value4 ) \
  value2 ^= value3; \
  value4  = value0; \
  value0 &= value1; \
  value0 ^= value2; \
  value2 |= value3; \
  value4  = ~value4; \
  value1 ^= value0; \
  value0 ^= value2; \
  value2 &= value4; \
  value2 ^= value0; \
  value0 |= value4; \
  value0 ^= value3; \
  value3 &= value2; \
  value4 ^= value3; \
  value3 ^= value1; \
  value1 &= value0; \
  value4 ^= value1; \
  value0 ^= value3;

#define libfcrypto_serpent_calculate_reverse_substitution5( value0, value1, value2, value3, value4 ) \
  value4  = value1; \
  value1 |= value2; \
  value2 ^= value4; \
  value1 ^= value3; \
  value3 &= value4; \
  value2 ^= value3; \
  value3 |= value0; \
  value0  = ~value0; \
  value3 ^= value2; \
  value2 |= value0; \
  value4 ^= value1; \
  value2 ^= value4; \
  value4 &= value0; \
  value0 ^= value1; \
  value1 ^= value3; \
  value0 &= value2; \
  value2 ^= value3; \
  value0 ^= value2; \
  value2 ^= value4; \
  value4 ^= value3;

#define libfcrypto_serpent_calculate_reverse_substitution6( value0, value1, value2, value3, value4 ) \
  value0 ^= value2; \
  value4  = value0; \
  value0 &= value3; \
  value2 ^= value3; \
  value0 ^= value2; \
  value3 ^= value1; \
  value2 |= value4; \
  value2 ^= value3; \
  value3 &= value0; \
  value0  = ~value0; \
  value3 ^= value1; \
  value1 &= value2; \
  value4 ^= value0; \
  value3 ^= value4; \
  value4 ^= value2; \
  value0 ^= value1; \
  value2 ^= value0;

#define libfcrypto_serpent_calculate_reverse_substitution7( value0, value1, value2, value3, value4 ) \
  value4  = value3; \
  value3 &= value0; \
  value0 ^= value2; \
  value2 |= value4; \
  value4 ^= value1; \
  value0  = ~value0; \
  value1 |= value3; \
  value4 ^= value0; \
  value0 &= value2; \
  value0 ^= value1; \
  value1 &= value2; \
  value3 ^= value2; \
  value4 ^= value3; \
  value2 &= value3; \
  value3 |= value0; \
  value1 ^= value4; \
  value3 ^= value4; \
  value4 &= value0; \
  value4 ^= value2;

#define GOLDEN_RATIO_FRACTION 0x9e3779b9UL

#define libfcrypto_serpent_calculate_expanded_key( expanded_key_values, expanded_key_index, value0, value1, value2, value3 ) \
  value1 ^= value3; \
  value1 ^= value2; \
  value1 ^= value0; \
  value1 ^= GOLDEN_RATIO_FRACTION ^ expanded_key_index; \
  value1 = byte_stream_bit_rotate_left_32bit( value1, 11 ); \
  expanded_key_values[ expanded_key_index ] = value1;

#define libfcrypto_serpent_calculate_expanded_key_with_forward_substitution0( expanded_key_value0, expanded_key_value1, expanded_key_value2, expanded_key_value3, expanded_key_value4, expanded_key_value5, expanded_key_value6, expanded_key_value7, value0, value1, value2, value3, value4 ) \
  expanded_key_value0 = value0; \
  expanded_key_value1 = value1; \
  expanded_key_value2 = value2; \
  expanded_key_value3 = value3; \
  value0 = expanded_key_value4; \
  value1 = expanded_key_value5; \
  value2 = expanded_key_value6; \
  value3 = expanded_key_value7; \
  libfcrypto_serpent_calculate_forward_substitution0( value0, value1, value2, value3, value4 );

#define libfcrypto_serpent_calculate_expanded_key_with_forward_substitution1( expanded_key_value0, expanded_key_value1, expanded_key_value2, expanded_key_value3, expanded_key_value4, expanded_key_value5, expanded_key_value6, expanded_key_value7, value0, value1, value2, value3, value4 ) \
  expanded_key_value0 = value0; \
  expanded_key_value1 = value1; \
  expanded_key_value2 = value2; \
  expanded_key_value3 = value3; \
  value0 = expanded_key_value4; \
  value1 = expanded_key_value5; \
  value2 = expanded_key_value6; \
  value3 = expanded_key_value7; \
  libfcrypto_serpent_calculate_forward_substitution1( value0, value1, value2, value3, value4 );

#define libfcrypto_serpent_calculate_expanded_key_with_forward_substitution2( expanded_key_value0, expanded_key_value1, expanded_key_value2, expanded_key_value3, expanded_key_value4, expanded_key_value5, expanded_key_value6, expanded_key_value7, value0, value1, value2, value3, value4 ) \
  expanded_key_value0 = value0; \
  expanded_key_value1 = value1; \
  expanded_key_value2 = value2; \
  expanded_key_value3 = value3; \
  value0 = expanded_key_value4; \
  value1 = expanded_key_value5; \
  value2 = expanded_key_value6; \
  value3 = expanded_key_value7; \
  libfcrypto_serpent_calculate_forward_substitution2( value0, value1, value2, value3, value4 );

#define libfcrypto_serpent_calculate_expanded_key_with_forward_substitution3( expanded_key_value0, expanded_key_value1, expanded_key_value2, expanded_key_value3, expanded_key_value4, expanded_key_value5, expanded_key_value6, expanded_key_value7, value0, value1, value2, value3, value4 ) \
  expanded_key_value0 = value0; \
  expanded_key_value1 = value1; \
  expanded_key_value2 = value2; \
  expanded_key_value3 = value3; \
  value0 = expanded_key_value4; \
  value1 = expanded_key_value5; \
  value2 = expanded_key_value6; \
  value3 = expanded_key_value7; \
  libfcrypto_serpent_calculate_forward_substitution3( value0, value1, value2, value3, value4 );

#define libfcrypto_serpent_calculate_expanded_key_with_forward_substitution4( expanded_key_value0, expanded_key_value1, expanded_key_value2, expanded_key_value3, expanded_key_value4, expanded_key_value5, expanded_key_value6, expanded_key_value7, value0, value1, value2, value3, value4 ) \
  expanded_key_value0 = value0; \
  expanded_key_value1 = value1; \
  expanded_key_value2 = value2; \
  expanded_key_value3 = value3; \
  value0 = expanded_key_value4; \
  value1 = expanded_key_value5; \
  value2 = expanded_key_value6; \
  value3 = expanded_key_value7; \
  libfcrypto_serpent_calculate_forward_substitution4( value0, value1, value2, value3, value4 );

#define libfcrypto_serpent_calculate_expanded_key_with_forward_substitution5( expanded_key_value0, expanded_key_value1, expanded_key_value2, expanded_key_value3, expanded_key_value4, expanded_key_value5, expanded_key_value6, expanded_key_value7, value0, value1, value2, value3, value4 ) \
  expanded_key_value0 = value0; \
  expanded_key_value1 = value1; \
  expanded_key_value2 = value2; \
  expanded_key_value3 = value3; \
  value0 = expanded_key_value4; \
  value1 = expanded_key_value5; \
  value2 = expanded_key_value6; \
  value3 = expanded_key_value7; \
  libfcrypto_serpent_calculate_forward_substitution5( value0, value1, value2, value3, value4 );

#define libfcrypto_serpent_calculate_expanded_key_with_forward_substitution6( expanded_key_value0, expanded_key_value1, expanded_key_value2, expanded_key_value3, expanded_key_value4, expanded_key_value5, expanded_key_value6, expanded_key_value7, value0, value1, value2, value3, value4 ) \
  expanded_key_value0 = value0; \
  expanded_key_value1 = value1; \
  expanded_key_value2 = value2; \
  expanded_key_value3 = value3; \
  value0 = expanded_key_value4; \
  value1 = expanded_key_value5; \
  value2 = expanded_key_value6; \
  value3 = expanded_key_value7; \
  libfcrypto_serpent_calculate_forward_substitution6( value0, value1, value2, value3, value4 );

#define libfcrypto_serpent_calculate_expanded_key_with_forward_substitution7( expanded_key_value0, expanded_key_value1, expanded_key_value2, expanded_key_value3, expanded_key_value4, expanded_key_value5, expanded_key_value6, expanded_key_value7, value0, value1, value2, value3, value4 ) \
  expanded_key_value0 = value0; \
  expanded_key_value1 = value1; \
  expanded_key_value2 = value2; \
  expanded_key_value3 = value3; \
  value0 = expanded_key_value4; \
  value1 = expanded_key_value5; \
  value2 = expanded_key_value6; \
  value3 = expanded_key_value7; \
  libfcrypto_serpent_calculate_forward_substitution7( value0, value1, value2, value3, value4 );

#define libfcrypto_serpent_calculate_forward_linear_transformation_and_substitution0( expanded_key_values, expanded_key_index, value0, value1, value2, value3, value4 ) \
  libfcrypto_serpent_calculate_forward_linear_transformation( expanded_key_values, expanded_key_index, value0, value1, value2, value3, value4 ); \
  libfcrypto_serpent_calculate_forward_substitution0( value0, value1, value2, value3, value4 );

#define libfcrypto_serpent_calculate_forward_linear_transformation_and_substitution1( expanded_key_values, expanded_key_index, value0, value1, value2, value3, value4 ) \
  libfcrypto_serpent_calculate_forward_linear_transformation( expanded_key_values, expanded_key_index, value0, value1, value2, value3, value4 ); \
  libfcrypto_serpent_calculate_forward_substitution1( value0, value1, value2, value3, value4 );

#define libfcrypto_serpent_calculate_forward_linear_transformation_and_substitution2( expanded_key_values, expanded_key_index, value0, value1, value2, value3, value4 ) \
  libfcrypto_serpent_calculate_forward_linear_transformation( expanded_key_values, expanded_key_index, value0, value1, value2, value3, value4 ); \
  libfcrypto_serpent_calculate_forward_substitution2( value0, value1, value2, value3, value4 );

#define libfcrypto_serpent_calculate_forward_linear_transformation_and_substitution3( expanded_key_values, expanded_key_index, value0, value1, value2, value3, value4 ) \
  libfcrypto_serpent_calculate_forward_linear_transformation( expanded_key_values, expanded_key_index, value0, value1, value2, value3, value4 ); \
  libfcrypto_serpent_calculate_forward_substitution3( value0, value1, value2, value3, value4 );

#define libfcrypto_serpent_calculate_forward_linear_transformation_and_substitution4( expanded_key_values, expanded_key_index, value0, value1, value2, value3, value4 ) \
  libfcrypto_serpent_calculate_forward_linear_transformation( expanded_key_values, expanded_key_index, value0, value1, value2, value3, value4 ); \
  libfcrypto_serpent_calculate_forward_substitution4( value0, value1, value2, value3, value4 );

#define libfcrypto_serpent_calculate_forward_linear_transformation_and_substitution5( expanded_key_values, expanded_key_index, value0, value1, value2, value3, value4 ) \
  libfcrypto_serpent_calculate_forward_linear_transformation( expanded_key_values, expanded_key_index, value0, value1, value2, value3, value4 ); \
  libfcrypto_serpent_calculate_forward_substitution5( value0, value1, value2, value3, value4 );

#define libfcrypto_serpent_calculate_forward_linear_transformation_and_substitution6( expanded_key_values, expanded_key_index, value0, value1, value2, value3, value4 ) \
  libfcrypto_serpent_calculate_forward_linear_transformation( expanded_key_values, expanded_key_index, value0, value1, value2, value3, value4 ); \
  libfcrypto_serpent_calculate_forward_substitution6( value0, value1, value2, value3, value4 );

#define libfcrypto_serpent_calculate_forward_linear_transformation_and_substitution7( expanded_key_values, expanded_key_index, value0, value1, value2, value3, value4 ) \
  libfcrypto_serpent_calculate_forward_linear_transformation( expanded_key_values, expanded_key_index, value0, value1, value2, value3, value4 ); \
  libfcrypto_serpent_calculate_forward_substitution7( value0, value1, value2, value3, value4 );

#define libfcrypto_serpent_calculate_reverse_linear_transformation_and_substitution0( expanded_key_values, expanded_key_index, value0, value1, value2, value3, value4 ) \
  libfcrypto_serpent_calculate_reverse_linear_transformation( expanded_key_values, expanded_key_index, value0, value1, value2, value3, value4 ); \
  libfcrypto_serpent_calculate_reverse_substitution0( value0, value1, value2, value3, value4 );

#define libfcrypto_serpent_calculate_reverse_linear_transformation_and_substitution1( expanded_key_values, expanded_key_index, value0, value1, value2, value3, value4 ) \
  libfcrypto_serpent_calculate_reverse_linear_transformation( expanded_key_values, expanded_key_index, value0, value1, value2, value3, value4 ); \
  libfcrypto_serpent_calculate_reverse_substitution1( value0, value1, value2, value3, value4 );

#define libfcrypto_serpent_calculate_reverse_linear_transformation_and_substitution2( expanded_key_values, expanded_key_index, value0, value1, value2, value3, value4 ) \
  libfcrypto_serpent_calculate_reverse_linear_transformation( expanded_key_values, expanded_key_index, value0, value1, value2, value3, value4 ); \
  libfcrypto_serpent_calculate_reverse_substitution2( value0, value1, value2, value3, value4 );

#define libfcrypto_serpent_calculate_reverse_linear_transformation_and_substitution3( expanded_key_values, expanded_key_index, value0, value1, value2, value3, value4 ) \
  libfcrypto_serpent_calculate_reverse_linear_transformation( expanded_key_values, expanded_key_index, value0, value1, value2, value3, value4 ); \
  libfcrypto_serpent_calculate_reverse_substitution3( value0, value1, value2, value3, value4 );

#define libfcrypto_serpent_calculate_reverse_linear_transformation_and_substitution4( expanded_key_values, expanded_key_index, value0, value1, value2, value3, value4 ) \
  libfcrypto_serpent_calculate_reverse_linear_transformation( expanded_key_values, expanded_key_index, value0, value1, value2, value3, value4 ); \
  libfcrypto_serpent_calculate_reverse_substitution4( value0, value1, value2, value3, value4 );

#define libfcrypto_serpent_calculate_reverse_linear_transformation_and_substitution5( expanded_key_values, expanded_key_index, value0, value1, value2, value3, value4 ) \
  libfcrypto_serpent_calculate_reverse_linear_transformation( expanded_key_values, expanded_key_index, value0, value1, value2, value3, value4 ); \
  libfcrypto_serpent_calculate_reverse_substitution5( value0, value1, value2, value3, value4 );

#define libfcrypto_serpent_calculate_reverse_linear_transformation_and_substitution6( expanded_key_values, expanded_key_index, value0, value1, value2, value3, value4 ) \
  libfcrypto_serpent_calculate_reverse_linear_transformation( expanded_key_values, expanded_key_index, value0, value1, value2, value3, value4 ); \
  libfcrypto_serpent_calculate_reverse_substitution6( value0, value1, value2, value3, value4 );

#define libfcrypto_serpent_calculate_reverse_linear_transformation_and_substitution7( expanded_key_values, expanded_key_index, value0, value1, value2, value3, value4 ) \
  libfcrypto_serpent_calculate_reverse_linear_transformation( expanded_key_values, expanded_key_index, value0, value1, value2, value3, value4 ); \
  libfcrypto_serpent_calculate_reverse_substitution7( value0, value1, value2, value3, value4 );

/* Creates a context
 * Make sure the value context is referencing, is set to NULL
 * Returns 1 if successful or -1 on error
 */
int libfcrypto_serpent_context_initialize(
     libfcrypto_serpent_context_t **context,
     libcerror_error_t **error )
{
  libfcrypto_internal_serpent_context_t *internal_context = NULL;
  static char *function                                   = "libfcrypto_serpent_context_initialize";

  if( context == NULL )
  {
    libcerror_error_set(
     error,
     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,
     "%s: invalid context.",
     function );

    return( -1 );
  }
  if( *context != NULL )
  {
    libcerror_error_set(
     error,
     LIBCERROR_ERROR_DOMAIN_RUNTIME,
     LIBCERROR_RUNTIME_ERROR_VALUE_ALREADY_SET,
     "%s: invalid context value already set.",
     function );

    return( -1 );
  }
  internal_context = memory_allocate_structure(
                      libfcrypto_internal_serpent_context_t );

  if( internal_context == NULL )
  {
    libcerror_error_set(
     error,
     LIBCERROR_ERROR_DOMAIN_MEMORY,
     LIBCERROR_MEMORY_ERROR_INSUFFICIENT,
     "%s: unable to create context.",
     function );

    goto on_error;
  }
  if( memory_set(
       internal_context,
       0,
       sizeof( libfcrypto_internal_serpent_context_t ) ) == NULL )
  {
    libcerror_error_set(
     error,
     LIBCERROR_ERROR_DOMAIN_MEMORY,
     LIBCERROR_MEMORY_ERROR_SET_FAILED,
     "%s: unable to clear context.",
     function );

    goto on_error;
  }
  *context = (libfcrypto_serpent_context_t *) internal_context;

  return( 1 );

on_error:
  if( internal_context != NULL )
  {
    memory_free(
     internal_context );
  }
  return( -1 );
}

/* Frees a context
 * Returns 1 if successful or -1 on error
 */
int libfcrypto_serpent_context_free(
     libfcrypto_serpent_context_t **context,
     libcerror_error_t **error )
{
  libfcrypto_internal_serpent_context_t *internal_context = NULL;
  static char *function                                   = "libfcrypto_serpent_context_free";
  int result                                              = 1;

  if( context == NULL )
  {
    libcerror_error_set(
     error,
     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,
     "%s: invalid context.",
     function );

    return( -1 );
  }
  if( *context != NULL )
  {
    internal_context = (libfcrypto_internal_serpent_context_t *) *context;
    *context         = NULL;

    if( memory_set(
         internal_context,
         0,
         sizeof( libfcrypto_internal_serpent_context_t ) ) == NULL )
    {
      libcerror_error_set(
       error,
       LIBCERROR_ERROR_DOMAIN_MEMORY,
       LIBCERROR_MEMORY_ERROR_SET_FAILED,
       "%s: unable to clear context.",
       function );

      result = -1;
    }
    memory_free(
     internal_context );
  }
  return( result );
}

/* Sets the key
 * Returns 1 if successful or -1 on error
 */
int libfcrypto_serpent_context_set_key(
     libfcrypto_serpent_context_t *context,
     const uint8_t *key,
     size_t key_bit_size,
     libcerror_error_t **error )
{
  uint8_t key_data[ 32 ];

  libfcrypto_internal_serpent_context_t *internal_context = NULL;
  static char *function                                   = "libfcrypto_serpent_context_set_key";
  size_t key_byte_offset                                  = 0;
  size_t key_byte_size                                    = 0;
  uint32_t value0                                         = 0;
  uint32_t value1                                         = 0;
  uint32_t value2                                         = 0;
  uint32_t value3                                         = 0;
  uint32_t value4                                         = 0;
  uint8_t expanded_key_index                              = 0;
  uint8_t previous_expanded_key_index                     = 0;

  if( context == NULL )
  {
    libcerror_error_set(
     error,
     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,
     "%s: invalid context.",
     function );

    return( -1 );
  }
  internal_context = (libfcrypto_internal_serpent_context_t *) context;

  if( key == NULL )
  {
    libcerror_error_set(
     error,
     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,
     "%s: invalid key.",
     function );

    return( -1 );
  }
  if( ( key_bit_size != 128 )
   && ( key_bit_size != 192 )
   && ( key_bit_size != 256 ) )
  {
    libcerror_error_set(
     error,
     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
     LIBCERROR_ARGUMENT_ERROR_UNSUPPORTED_VALUE,
     "%s: unsupported key bit size.",
     function );

    return( -1 );
  }
  if( memory_set(
       key_data,
       0,
       32  ) == NULL )
  {
    libcerror_error_set(
     error,
     LIBCERROR_ERROR_DOMAIN_MEMORY,
     LIBCERROR_MEMORY_ERROR_SET_FAILED,
     "%s: unable to clear key data.",
     function );

    goto on_error;
  }
  if( memory_set(
       internal_context->expanded_key,
       0,
       sizeof( uint32_t ) * LIBFCRYPTO_SERPENT_NUMBER_OF_EXPANDED_KEY_ELEMENTS ) == NULL )
  {
    libcerror_error_set(
     error,
     LIBCERROR_ERROR_DOMAIN_MEMORY,
     LIBCERROR_MEMORY_ERROR_SET_FAILED,
     "%s: unable to clear expanded key.",
     function );

    goto on_error;
  }
  /* 1. Copy and pad the provided key
   */
  key_byte_size = key_bit_size / 8;

  if( memory_copy(
       key_data,
       key,
       key_byte_size ) == NULL )
  {
    libcerror_error_set(
     error,
     LIBCERROR_ERROR_DOMAIN_MEMORY,
     LIBCERROR_MEMORY_ERROR_COPY_FAILED,
     "%s: unable to copy key to key data.",
     function );

    goto on_error;
  }
  if( key_byte_size < 32 )
  {
    key_data[ key_byte_size ] = 1;
  }
  for( key_byte_offset = 0;
       key_byte_offset < 32;
       key_byte_offset += 4 )
  {
    byte_stream_copy_to_uint32_little_endian(
     &( key_data[ key_byte_offset ] ),
     value0 );

    internal_context->expanded_key[ expanded_key_index++ ] = value0;
  }
  /* 2. Calculate the prekeys
   */
  value0 = internal_context->expanded_key[ 3 ];
  value1 = internal_context->expanded_key[ 4 ];
  value2 = internal_context->expanded_key[ 5 ];
  value3 = internal_context->expanded_key[ 6 ];
  value4 = internal_context->expanded_key[ 7 ];

  libfcrypto_serpent_calculate_expanded_key(
   internal_context->expanded_key,
   0,
   internal_context->expanded_key[ 0 ],
   value0,
   value4,
   value2 );

  libfcrypto_serpent_calculate_expanded_key(
   internal_context->expanded_key,
   1,
   internal_context->expanded_key[ 1 ],
   value1,
   value0,
   value3 );

  libfcrypto_serpent_calculate_expanded_key(
   internal_context->expanded_key,
   2,
   ( internal_context->expanded_key )[ 2 ],
   value2,
   value1,
   value4 );

  libfcrypto_serpent_calculate_expanded_key(
   internal_context->expanded_key,
   3,
   ( internal_context->expanded_key )[ 3 ],
   value3,
   value2,
   value0 );

  libfcrypto_serpent_calculate_expanded_key(
   internal_context->expanded_key,
   4,
   ( internal_context->expanded_key )[ 4 ],
   value4,
   value3,
   value1 );

  libfcrypto_serpent_calculate_expanded_key(
   internal_context->expanded_key,
   5,
   ( internal_context->expanded_key )[ 5 ],
   value0,
   value4,
   value2 );

  libfcrypto_serpent_calculate_expanded_key(
   internal_context->expanded_key,
   6,
   ( internal_context->expanded_key )[ 6 ],
   value1,
   value0,
   value3 );

  libfcrypto_serpent_calculate_expanded_key(
   internal_context->expanded_key,
   7,
   ( internal_context->expanded_key )[ 7 ],
   value2,
   value1,
   value4 );

  libfcrypto_serpent_calculate_expanded_key(
   internal_context->expanded_key,
   8,
   ( internal_context->expanded_key )[ 0 ],
   value3,
   value2,
   value0 );

  libfcrypto_serpent_calculate_expanded_key(
   internal_context->expanded_key,
   9,
   ( internal_context->expanded_key )[ 1 ],
   value4,
   value3,
   value1 );

  libfcrypto_serpent_calculate_expanded_key(
   internal_context->expanded_key,
   10,
   ( internal_context->expanded_key )[ 2 ],
   value0,
   value4,
   value2 );

  libfcrypto_serpent_calculate_expanded_key(
   internal_context->expanded_key,
   11,
   ( internal_context->expanded_key )[ 3 ],
   value1,
   value0,
   value3 );

  previous_expanded_key_index = 4;
  expanded_key_index          = 12;

  while( expanded_key_index < 128 )
  {
    libfcrypto_serpent_calculate_expanded_key(
     internal_context->expanded_key,
     expanded_key_index,
     ( internal_context->expanded_key )[ previous_expanded_key_index ],
     value2,
     value1,
     value4 );

    expanded_key_index++;
    previous_expanded_key_index++;

    libfcrypto_serpent_calculate_expanded_key(
     internal_context->expanded_key,
     expanded_key_index,
     ( internal_context->expanded_key )[ previous_expanded_key_index ],
     value3,
     value2,
     value0 );

    expanded_key_index++;
    previous_expanded_key_index++;

    libfcrypto_serpent_calculate_expanded_key(
     internal_context->expanded_key,
     expanded_key_index,
     ( internal_context->expanded_key )[ previous_expanded_key_index ],
     value4,
     value3,
     value1 );

    expanded_key_index++;
    previous_expanded_key_index++;

    libfcrypto_serpent_calculate_expanded_key(
     internal_context->expanded_key,
     expanded_key_index,
     ( internal_context->expanded_key )[ previous_expanded_key_index ],
     value0,
     value4,
     value2 );

    expanded_key_index++;
    previous_expanded_key_index++;

    libfcrypto_serpent_calculate_expanded_key(
     internal_context->expanded_key,
     expanded_key_index,
     ( internal_context->expanded_key )[ previous_expanded_key_index ],
     value1,
     value0,
     value3 );

    expanded_key_index++;
    previous_expanded_key_index++;
  }
  /* 3. Calculate the round keys
   */
  libfcrypto_serpent_calculate_forward_substitution3(
   value3,
   value4,
   value0,
   value1,
   value2 );

  libfcrypto_serpent_calculate_expanded_key_with_forward_substitution4(
   internal_context->expanded_key[ 128 ],
   internal_context->expanded_key[ 129 ],
   internal_context->expanded_key[ 130 ],
   internal_context->expanded_key[ 131 ],
   internal_context->expanded_key[ 124 ],
   internal_context->expanded_key[ 125 ],
   internal_context->expanded_key[ 126 ],
   internal_context->expanded_key[ 127 ],
   value1,
   value2,
   value4,
   value3,
   value0 );

  libfcrypto_serpent_calculate_expanded_key_with_forward_substitution5(
   internal_context->expanded_key[ 124 ],
   internal_context->expanded_key[ 125 ],
   internal_context->expanded_key[ 126 ],
   internal_context->expanded_key[ 127 ],
   internal_context->expanded_key[ 120 ],
   internal_context->expanded_key[ 121 ],
   internal_context->expanded_key[ 122 ],
   internal_context->expanded_key[ 123 ],
   value2,
   value4,
   value3,
   value0,
   value1 );

  libfcrypto_serpent_calculate_expanded_key_with_forward_substitution6(
   internal_context->expanded_key[ 120 ],
   internal_context->expanded_key[ 121 ],
   internal_context->expanded_key[ 122 ],
   internal_context->expanded_key[ 123 ],
   internal_context->expanded_key[ 116 ],
   internal_context->expanded_key[ 117 ],
   internal_context->expanded_key[ 118 ],
   internal_context->expanded_key[ 119 ],
   value1,
   value2,
   value4,
   value0,
   value3 );

  libfcrypto_serpent_calculate_expanded_key_with_forward_substitution7(
   internal_context->expanded_key[ 116 ],
   internal_context->expanded_key[ 117 ],
   internal_context->expanded_key[ 118 ],
   internal_context->expanded_key[ 119 ],
   internal_context->expanded_key[ 112 ],
   internal_context->expanded_key[ 113 ],
   internal_context->expanded_key[ 114 ],
   internal_context->expanded_key[ 115 ],
   value4,
   value3,
   value2,
   value0,
   value1 );

  libfcrypto_serpent_calculate_expanded_key_with_forward_substitution0(
   internal_context->expanded_key[ 112 ],
   internal_context->expanded_key[ 113 ],
   internal_context->expanded_key[ 114 ],
   internal_context->expanded_key[ 115 ],
   internal_context->expanded_key[ 108 ],
   internal_context->expanded_key[ 109 ],
   internal_context->expanded_key[ 110 ],
   internal_context->expanded_key[ 111 ],
   value1,
   value2,
   value0,
   value4,
   value3 );

  libfcrypto_serpent_calculate_expanded_key_with_forward_substitution1(
   internal_context->expanded_key[ 108 ],
   internal_context->expanded_key[ 109 ],
   internal_context->expanded_key[ 110 ],
   internal_context->expanded_key[ 111 ],
   internal_context->expanded_key[ 104 ],
   internal_context->expanded_key[ 105 ],
   internal_context->expanded_key[ 106 ],
   internal_context->expanded_key[ 107 ],
   value0,
   value2,
   value4,
   value1,
   value3 );

  libfcrypto_serpent_calculate_expanded_key_with_forward_substitution2(
   internal_context->expanded_key[ 104 ],
   internal_context->expanded_key[ 105 ],
   internal_context->expanded_key[ 106 ],
   internal_context->expanded_key[ 107 ],
   internal_context->expanded_key[ 100 ],
   internal_context->expanded_key[ 101 ],
   internal_context->expanded_key[ 102 ],
   internal_context->expanded_key[ 103 ],
   value3,
   value4,
   value1,
   value0,
   value2 );

  libfcrypto_serpent_calculate_expanded_key_with_forward_substitution3(
   internal_context->expanded_key[ 100 ],
   internal_context->expanded_key[ 101 ],
   internal_context->expanded_key[ 102 ],
   internal_context->expanded_key[ 103 ],
   internal_context->expanded_key[ 96 ],
   internal_context->expanded_key[ 97 ],
   internal_context->expanded_key[ 98 ],
   internal_context->expanded_key[ 99 ],
   value2,
   value4,
   value3,
   value0,
   value1 );

  libfcrypto_serpent_calculate_expanded_key_with_forward_substitution4(
   internal_context->expanded_key[ 96 ],
   internal_context->expanded_key[ 97 ],
   internal_context->expanded_key[ 98 ],
   internal_context->expanded_key[ 99 ],
   internal_context->expanded_key[ 92 ],
   internal_context->expanded_key[ 93 ],
   internal_context->expanded_key[ 94 ],
   internal_context->expanded_key[ 95 ],
   value0,
   value1,
   value4,
   value2,
   value3 );

  libfcrypto_serpent_calculate_expanded_key_with_forward_substitution5(
   internal_context->expanded_key[ 92 ],
   internal_context->expanded_key[ 93 ],
   internal_context->expanded_key[ 94 ],
   internal_context->expanded_key[ 95 ],
   internal_context->expanded_key[ 88 ],
   internal_context->expanded_key[ 89 ],
   internal_context->expanded_key[ 90 ],
   internal_context->expanded_key[ 91 ],
   value1,
   value4,
   value2,
   value3,
   value0 );

  libfcrypto_serpent_calculate_expanded_key_with_forward_substitution6(
   internal_context->expanded_key[ 88 ],
   internal_context->expanded_key[ 89 ],
   internal_context->expanded_key[ 90 ],
   internal_context->expanded_key[ 91 ],
   internal_context->expanded_key[ 84 ],
   internal_context->expanded_key[ 85 ],
   internal_context->expanded_key[ 86 ],
   internal_context->expanded_key[ 87 ],
   value0,
   value1,
   value4,
   value3,
   value2 );

  libfcrypto_serpent_calculate_expanded_key_with_forward_substitution7(
   internal_context->expanded_key[ 84 ],
   internal_context->expanded_key[ 85 ],
   internal_context->expanded_key[ 86 ],
   internal_context->expanded_key[ 87 ],
   internal_context->expanded_key[ 80 ],
   internal_context->expanded_key[ 81 ],
   internal_context->expanded_key[ 82 ],
   internal_context->expanded_key[ 83 ],
   value4,
   value2,
   value1,
   value3,
   value0 );

  libfcrypto_serpent_calculate_expanded_key_with_forward_substitution0(
   internal_context->expanded_key[ 80 ],
   internal_context->expanded_key[ 81 ],
   internal_context->expanded_key[ 82 ],
   internal_context->expanded_key[ 83 ],
   internal_context->expanded_key[ 76 ],
   internal_context->expanded_key[ 77 ],
   internal_context->expanded_key[ 78 ],
   internal_context->expanded_key[ 79 ],
   value0,
   value1,
   value3,
   value4,
   value2 );

  libfcrypto_serpent_calculate_expanded_key_with_forward_substitution1(
   internal_context->expanded_key[ 76 ],
   internal_context->expanded_key[ 77 ],
   internal_context->expanded_key[ 78 ],
   internal_context->expanded_key[ 79 ],
   internal_context->expanded_key[ 72 ],
   internal_context->expanded_key[ 73 ],
   internal_context->expanded_key[ 74 ],
   internal_context->expanded_key[ 75 ],
   value3,
   value1,
   value4,
   value0,
   value2 );

  libfcrypto_serpent_calculate_expanded_key_with_forward_substitution2(
   internal_context->expanded_key[ 72 ],
   internal_context->expanded_key[ 73 ],
   internal_context->expanded_key[ 74 ],
   internal_context->expanded_key[ 75 ],
   internal_context->expanded_key[ 68 ],
   internal_context->expanded_key[ 69 ],
   internal_context->expanded_key[ 70 ],
   internal_context->expanded_key[ 71 ],
   value2,
   value4,
   value0,
   value3,
   value1 );

  libfcrypto_serpent_calculate_expanded_key_with_forward_substitution3(
   internal_context->expanded_key[ 68 ],
   internal_context->expanded_key[ 69 ],
   internal_context->expanded_key[ 70 ],
   internal_context->expanded_key[ 71 ],
   internal_context->expanded_key[ 64 ],
   internal_context->expanded_key[ 65 ],
   internal_context->expanded_key[ 66 ],
   internal_context->expanded_key[ 67 ],
   value1,
   value4,
   value2,
   value3,
   value0 );

  libfcrypto_serpent_calculate_expanded_key_with_forward_substitution4(
   internal_context->expanded_key[ 64 ],
   internal_context->expanded_key[ 65 ],
   internal_context->expanded_key[ 66 ],
   internal_context->expanded_key[ 67 ],
   internal_context->expanded_key[ 60 ],
   internal_context->expanded_key[ 61 ],
   internal_context->expanded_key[ 62 ],
   internal_context->expanded_key[ 63 ],
   value3,
   value0,
   value4,
   value1,
   value2 );

  libfcrypto_serpent_calculate_expanded_key_with_forward_substitution5(
   internal_context->expanded_key[ 60 ],
   internal_context->expanded_key[ 61 ],
   internal_context->expanded_key[ 62 ],
   internal_context->expanded_key[ 63 ],
   internal_context->expanded_key[ 56 ],
   internal_context->expanded_key[ 57 ],
   internal_context->expanded_key[ 58 ],
   internal_context->expanded_key[ 59 ],
   value0,
   value4,
   value1,
   value2,
   value3 );

  libfcrypto_serpent_calculate_expanded_key_with_forward_substitution6(
   internal_context->expanded_key[ 56 ],
   internal_context->expanded_key[ 57 ],
   internal_context->expanded_key[ 58 ],
   internal_context->expanded_key[ 59 ],
   internal_context->expanded_key[ 52 ],
   internal_context->expanded_key[ 53 ],
   internal_context->expanded_key[ 54 ],
   internal_context->expanded_key[ 55 ],
   value3,
   value0,
   value4,
   value2,
   value1 );

  libfcrypto_serpent_calculate_expanded_key_with_forward_substitution7(
   internal_context->expanded_key[ 52 ],
   internal_context->expanded_key[ 53 ],
   internal_context->expanded_key[ 54 ],
   internal_context->expanded_key[ 55 ],
   internal_context->expanded_key[ 48 ],
   internal_context->expanded_key[ 49 ],
   internal_context->expanded_key[ 50 ],
   internal_context->expanded_key[ 51 ],
   value4,
   value1,
   value0,
   value2,
   value3 );

  libfcrypto_serpent_calculate_expanded_key_with_forward_substitution0(
   internal_context->expanded_key[ 48 ],
   internal_context->expanded_key[ 49 ],
   internal_context->expanded_key[ 50 ],
   internal_context->expanded_key[ 51 ],
   internal_context->expanded_key[ 44 ],
   internal_context->expanded_key[ 45 ],
   internal_context->expanded_key[ 46 ],
   internal_context->expanded_key[ 47 ],
   value3,
   value0,
   value2,
   value4,
   value1 );

  libfcrypto_serpent_calculate_expanded_key_with_forward_substitution1(
   internal_context->expanded_key[ 44 ],
   internal_context->expanded_key[ 45 ],
   internal_context->expanded_key[ 46 ],
   internal_context->expanded_key[ 47 ],
   internal_context->expanded_key[ 40 ],
   internal_context->expanded_key[ 41 ],
   internal_context->expanded_key[ 42 ],
   internal_context->expanded_key[ 43 ],
   value2,
   value0,
   value4,
   value3,
   value1 );

  libfcrypto_serpent_calculate_expanded_key_with_forward_substitution2(
   internal_context->expanded_key[ 40 ],
   internal_context->expanded_key[ 41 ],
   internal_context->expanded_key[ 42 ],
   internal_context->expanded_key[ 43 ],
   internal_context->expanded_key[ 36 ],
   internal_context->expanded_key[ 37 ],
   internal_context->expanded_key[ 38 ],
   internal_context->expanded_key[ 39 ],
   value1,
   value4,
   value3,
   value2,
   value0 );

  libfcrypto_serpent_calculate_expanded_key_with_forward_substitution3(
   internal_context->expanded_key[ 36 ],
   internal_context->expanded_key[ 37 ],
   internal_context->expanded_key[ 38 ],
   internal_context->expanded_key[ 39 ],
   internal_context->expanded_key[ 32 ],
   internal_context->expanded_key[ 33 ],
   internal_context->expanded_key[ 34 ],
   internal_context->expanded_key[ 35 ],
   value0,
   value4,
   value1,
   value2,
   value3 );

  libfcrypto_serpent_calculate_expanded_key_with_forward_substitution4(
   internal_context->expanded_key[ 32 ],
   internal_context->expanded_key[ 33 ],
   internal_context->expanded_key[ 34 ],
   internal_context->expanded_key[ 35 ],
   internal_context->expanded_key[ 28 ],
   internal_context->expanded_key[ 29 ],
   internal_context->expanded_key[ 30 ],
   internal_context->expanded_key[ 31 ],
   value2,
   value3,
   value4,
   value0,
   value1 );

  libfcrypto_serpent_calculate_expanded_key_with_forward_substitution5(
   internal_context->expanded_key[ 28 ],
   internal_context->expanded_key[ 29 ],
   internal_context->expanded_key[ 30 ],
   internal_context->expanded_key[ 31 ],
   internal_context->expanded_key[ 24 ],
   internal_context->expanded_key[ 25 ],
   internal_context->expanded_key[ 26 ],
   internal_context->expanded_key[ 27 ],
   value3,
   value4,
   value0,
   value1,
   value2 );

  libfcrypto_serpent_calculate_expanded_key_with_forward_substitution6(
   internal_context->expanded_key[ 24 ],
   internal_context->expanded_key[ 25 ],
   internal_context->expanded_key[ 26 ],
   internal_context->expanded_key[ 27 ],
   internal_context->expanded_key[ 20 ],
   internal_context->expanded_key[ 21 ],
   internal_context->expanded_key[ 22 ],
   internal_context->expanded_key[ 23 ],
   value2,
   value3,
   value4,
   value1,
   value0 );

  libfcrypto_serpent_calculate_expanded_key_with_forward_substitution7(
   internal_context->expanded_key[ 20 ],
   internal_context->expanded_key[ 21 ],
   internal_context->expanded_key[ 22 ],
   internal_context->expanded_key[ 23 ],
   internal_context->expanded_key[ 16 ],
   internal_context->expanded_key[ 17 ],
   internal_context->expanded_key[ 18 ],
   internal_context->expanded_key[ 19 ],
   value4,
   value0,
   value3,
   value1,
   value2 );

  libfcrypto_serpent_calculate_expanded_key_with_forward_substitution0(
   internal_context->expanded_key[ 16 ],
   internal_context->expanded_key[ 17 ],
   internal_context->expanded_key[ 18 ],
   internal_context->expanded_key[ 19 ],
   internal_context->expanded_key[ 12 ],
   internal_context->expanded_key[ 13 ],
   internal_context->expanded_key[ 14 ],
   internal_context->expanded_key[ 15 ],
   value2,
   value3,
   value1,
   value4,
   value0 );

  libfcrypto_serpent_calculate_expanded_key_with_forward_substitution1(
   internal_context->expanded_key[ 12 ],
   internal_context->expanded_key[ 13 ],
   internal_context->expanded_key[ 14 ],
   internal_context->expanded_key[ 15 ],
   internal_context->expanded_key[ 8 ],
   internal_context->expanded_key[ 9 ],
   internal_context->expanded_key[ 10 ],
   internal_context->expanded_key[ 11 ],
   value1,
   value3,
   value4,
   value2,
   value0 );

  libfcrypto_serpent_calculate_expanded_key_with_forward_substitution2(
   internal_context->expanded_key[ 8 ],
   internal_context->expanded_key[ 9 ],
   internal_context->expanded_key[ 10 ],
   internal_context->expanded_key[ 11 ],
   internal_context->expanded_key[ 4 ],
   internal_context->expanded_key[ 5 ],
   internal_context->expanded_key[ 6 ],
   internal_context->expanded_key[ 7 ],
   value0,
   value4,
   value2,
   value1,
   value3 );

  libfcrypto_serpent_calculate_expanded_key_with_forward_substitution3(
   internal_context->expanded_key[ 4 ],
   internal_context->expanded_key[ 5 ],
   internal_context->expanded_key[ 6 ],
   internal_context->expanded_key[ 7 ],
   internal_context->expanded_key[ 0 ],
   internal_context->expanded_key[ 1 ],
   internal_context->expanded_key[ 2 ],
   internal_context->expanded_key[ 3 ],
   value3,
   value4,
   value0,
   value1,
   value2 );

  internal_context->expanded_key[ 0 ] = value1;
  internal_context->expanded_key[ 1 ] = value2;
  internal_context->expanded_key[ 2 ] = value4;
  internal_context->expanded_key[ 3 ] = value3;

  return( 1 );

on_error:
  memory_set(
   key_data,
   0,
   32 );

  memory_set(
   internal_context->expanded_key,
   0,
   sizeof( uint32_t ) * LIBFCRYPTO_SERPENT_NUMBER_OF_EXPANDED_KEY_ELEMENTS );

  return( -1 );
}

/* Encrypts a block of data using Serpent
 * The size must be a multitude of the Serpent block size (16 byte)
 * Returns 1 if successful or -1 on error
 */
int libfcrypto_internal_serpent_context_encrypt_block(
     libfcrypto_internal_serpent_context_t *internal_context,
     const uint8_t *input_data,
     size_t input_data_size,
     uint8_t *output_data,
     size_t output_data_size,
     libcerror_error_t **error )
{
  static char *function = "libfcrypto_internal_serpent_context_encrypt_block";
  uint32_t value0       = 0;
  uint32_t value1       = 0;
  uint32_t value2       = 0;
  uint32_t value3       = 0;
  uint32_t value4       = 0;

  if( internal_context == NULL )
  {
    libcerror_error_set(
     error,
     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,
     "%s: invalid context.",
     function );

    return( -1 );
  }
  if( input_data == NULL )
  {
    libcerror_error_set(
     error,
     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,
     "%s: invalid input data.",
     function );

    return( -1 );
  }
  if( ( input_data_size < 16 )
   || ( input_data_size > (size_t) SSIZE_MAX ) )
  {
    libcerror_error_set(
     error,
     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
     LIBCERROR_ARGUMENT_ERROR_VALUE_OUT_OF_BOUNDS,
     "%s: invalid input data size value out of bounds.",
     function );

    return( -1 );
  }
  if( output_data == NULL )
  {
    libcerror_error_set(
     error,
     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,
     "%s: invalid output data.",
     function );

    return( -1 );
  }
  if( ( output_data_size < 16 )
   || ( output_data_size > (size_t) SSIZE_MAX ) )
  {
    libcerror_error_set(
     error,
     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
     LIBCERROR_ARGUMENT_ERROR_VALUE_OUT_OF_BOUNDS,
     "%s: invalid output data size value out of bounds.",
     function );

    return( -1 );
  }
  byte_stream_copy_to_uint32_little_endian(
   &( input_data[ 0 ] ),
   value0 );

  byte_stream_copy_to_uint32_little_endian(
   &( input_data[ 4 ] ),
   value1 );

  byte_stream_copy_to_uint32_little_endian(
   &( input_data[ 8 ] ),
   value2 );

  byte_stream_copy_to_uint32_little_endian(
   &( input_data[ 12 ] ),
   value3 );

  value0 ^= internal_context->expanded_key[ 0 ];
  value1 ^= internal_context->expanded_key[ 1 ];
  value2 ^= internal_context->expanded_key[ 2 ];
  value3 ^= internal_context->expanded_key[ 3 ];

  libfcrypto_serpent_calculate_forward_substitution0(
   value0,
   value1,
   value2,
   value3,
   value4 );

  libfcrypto_serpent_calculate_forward_linear_transformation_and_substitution1(
   internal_context->expanded_key,
   4,
   value2,
   value1,
   value3,
   value0,
   value4 );

  libfcrypto_serpent_calculate_forward_linear_transformation_and_substitution2(
   internal_context->expanded_key,
   8,
   value4,
   value3,
   value0,
   value2,
   value1 );

  libfcrypto_serpent_calculate_forward_linear_transformation_and_substitution3(
   internal_context->expanded_key,
   12,
   value1,
   value3,
   value4,
   value2,
   value0 );

  libfcrypto_serpent_calculate_forward_linear_transformation_and_substitution4(
   internal_context->expanded_key,
   16,
   value2,
   value0,
   value3,
   value1,
   value4 );

  libfcrypto_serpent_calculate_forward_linear_transformation_and_substitution5(
   internal_context->expanded_key,
   20,
   value0,
   value3,
   value1,
   value4,
   value2 );

  libfcrypto_serpent_calculate_forward_linear_transformation_and_substitution6(
   internal_context->expanded_key,
   24,
   value2,
   value0,
   value3,
   value4,
   value1 );

  libfcrypto_serpent_calculate_forward_linear_transformation_and_substitution7(
   internal_context->expanded_key,
   28,
   value3,
   value1,
   value0,
   value4,
   value2 );

  libfcrypto_serpent_calculate_forward_linear_transformation_and_substitution0(
   internal_context->expanded_key,
   32,
   value2,
   value0,
   value4,
   value3,
   value1 );

  libfcrypto_serpent_calculate_forward_linear_transformation_and_substitution1(
   internal_context->expanded_key,
   36,
   value4,
   value0,
   value3,
   value2,
   value1 );

  libfcrypto_serpent_calculate_forward_linear_transformation_and_substitution2(
   internal_context->expanded_key,
   40,
   value1,
   value3,
   value2,
   value4,
   value0 );

  libfcrypto_serpent_calculate_forward_linear_transformation_and_substitution3(
   internal_context->expanded_key,
   44,
   value0,
   value3,
   value1,
   value4,
   value2 );

  libfcrypto_serpent_calculate_forward_linear_transformation_and_substitution4(
   internal_context->expanded_key,
   48,
   value4,
   value2,
   value3,
   value0,
   value1 );

  libfcrypto_serpent_calculate_forward_linear_transformation_and_substitution5(
   internal_context->expanded_key,
   52,
   value2,
   value3,
   value0,
   value1,
   value4 );

  libfcrypto_serpent_calculate_forward_linear_transformation_and_substitution6(
   internal_context->expanded_key,
   56,
   value4,
   value2,
   value3,
   value1,
   value0 );

  libfcrypto_serpent_calculate_forward_linear_transformation_and_substitution7(
   internal_context->expanded_key,
   60,
   value3,
   value0,
   value2,
   value1,
   value4 );

  libfcrypto_serpent_calculate_forward_linear_transformation_and_substitution0(
   internal_context->expanded_key,
   64,
   value4,
   value2,
   value1,
   value3,
   value0 );

  libfcrypto_serpent_calculate_forward_linear_transformation_and_substitution1(
   internal_context->expanded_key,
   68,
   value1,
   value2,
   value3,
   value4,
   value0 );

  libfcrypto_serpent_calculate_forward_linear_transformation_and_substitution2(
   internal_context->expanded_key,
   72,
   value0,
   value3,
   value4,
   value1,
   value2 );

  libfcrypto_serpent_calculate_forward_linear_transformation_and_substitution3(
   internal_context->expanded_key,
   76,
   value2,
   value3,
   value0,
   value1,
   value4 );

  libfcrypto_serpent_calculate_forward_linear_transformation_and_substitution4(
   internal_context->expanded_key,
   80,
   value1,
   value4,
   value3,
   value2,
   value0 );

  libfcrypto_serpent_calculate_forward_linear_transformation_and_substitution5(
   internal_context->expanded_key,
   84,
   value4,
   value3,
   value2,
   value0,
   value1 );

  libfcrypto_serpent_calculate_forward_linear_transformation_and_substitution6(
   internal_context->expanded_key,
   88,
   value1,
   value4,
   value3,
   value0,
   value2 );

  libfcrypto_serpent_calculate_forward_linear_transformation_and_substitution7(
   internal_context->expanded_key,
   92,
   value3,
   value2,
   value4,
   value0,
   value1 );

  libfcrypto_serpent_calculate_forward_linear_transformation_and_substitution0(
   internal_context->expanded_key,
   96,
   value1,
   value4,
   value0,
   value3,
   value2 );

  libfcrypto_serpent_calculate_forward_linear_transformation_and_substitution1(
   internal_context->expanded_key,
   100,
   value0,
   value4,
   value3,
   value1,
   value2 );

  libfcrypto_serpent_calculate_forward_linear_transformation_and_substitution2(
   internal_context->expanded_key,
   104,
   value2,
   value3,
   value1,
   value0,
   value4 );

  libfcrypto_serpent_calculate_forward_linear_transformation_and_substitution3(
   internal_context->expanded_key,
   108,
   value4,
   value3,
   value2,
   value0,
   value1 );

  libfcrypto_serpent_calculate_forward_linear_transformation_and_substitution4(
   internal_context->expanded_key,
   112,
   value0,
   value1,
   value3,
   value4,
   value2 );

  libfcrypto_serpent_calculate_forward_linear_transformation_and_substitution5(
   internal_context->expanded_key,
   116,
   value1,
   value3,
   value4,
   value2,
   value0 );

  libfcrypto_serpent_calculate_forward_linear_transformation_and_substitution6(
   internal_context->expanded_key,
   120,
   value0,
   value1,
   value3,
   value2,
   value4 );

  libfcrypto_serpent_calculate_forward_linear_transformation_and_substitution7(
   internal_context->expanded_key,
   124,
   value3,
   value4,
   value1,
   value2,
   value0 );

  value0 ^= internal_context->expanded_key[ 128 ];
  value1 ^= internal_context->expanded_key[ 129 ];
  value2 ^= internal_context->expanded_key[ 130 ];
  value3 ^= internal_context->expanded_key[ 131 ];

  byte_stream_copy_from_uint32_little_endian(
   &( output_data[ 0 ] ),
   value0 );

  byte_stream_copy_from_uint32_little_endian(
   &( output_data[ 4 ] ),
   value1 );

  byte_stream_copy_from_uint32_little_endian(
   &( output_data[ 8 ] ),
   value2 );

  byte_stream_copy_from_uint32_little_endian(
   &( output_data[ 12 ] ),
   value3 );

  return( 1 );
}

/* Decrypts a block of data using Serpent
 * The size must be a multitude of the Serpent block size (16 byte)
 * Returns 1 if successful or -1 on error
 */
int libfcrypto_internal_serpent_context_decrypt_block(
     libfcrypto_internal_serpent_context_t *internal_context,
     const uint8_t *input_data,
     size_t input_data_size,
     uint8_t *output_data,
     size_t output_data_size,
     libcerror_error_t **error  )
{
  static char *function = "libfcrypto_internal_serpent_context_decrypt_block";
  uint32_t value0       = 0;
  uint32_t value1       = 0;
  uint32_t value2       = 0;
  uint32_t value3       = 0;
  uint32_t value4       = 0;

  if( internal_context == NULL )
  {
    libcerror_error_set(
     error,
     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,
     "%s: invalid context.",
     function );

    return( -1 );
  }
  if( input_data == NULL )
  {
    libcerror_error_set(
     error,
     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,
     "%s: invalid input data.",
     function );

    return( -1 );
  }
  if( ( input_data_size < 16 )
   || ( input_data_size > (size_t) SSIZE_MAX ) )
  {
    libcerror_error_set(
     error,
     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
     LIBCERROR_ARGUMENT_ERROR_VALUE_OUT_OF_BOUNDS,
     "%s: invalid input data size value out of bounds.",
     function );

    return( -1 );
  }
  if( output_data == NULL )
  {
    libcerror_error_set(
     error,
     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,
     "%s: invalid output data.",
     function );

    return( -1 );
  }
  if( ( output_data_size < 16 )
   || ( output_data_size > (size_t) SSIZE_MAX ) )
  {
    libcerror_error_set(
     error,
     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
     LIBCERROR_ARGUMENT_ERROR_VALUE_OUT_OF_BOUNDS,
     "%s: invalid output data size value out of bounds.",
     function );

    return( -1 );
  }
  byte_stream_copy_to_uint32_little_endian(
   &( input_data[ 0 ] ),
   value0 );

  byte_stream_copy_to_uint32_little_endian(
   &( input_data[ 4 ] ),
   value1 );

  byte_stream_copy_to_uint32_little_endian(
   &( input_data[ 8 ] ),
   value2 );

  byte_stream_copy_to_uint32_little_endian(
   &( input_data[ 12 ] ),
   value3 );

  value0 ^= internal_context->expanded_key[ 128 ];
  value1 ^= internal_context->expanded_key[ 129 ];
  value2 ^= internal_context->expanded_key[ 130 ];
  value3 ^= internal_context->expanded_key[ 131 ];

  libfcrypto_serpent_calculate_reverse_substitution7(
   value0,
   value1,
   value2,
   value3,
   value4 );

  libfcrypto_serpent_calculate_reverse_linear_transformation_and_substitution6(
   internal_context->expanded_key,
   4 * 31,
   value1,
   value3,
   value0,
   value4,
   value2 );

  libfcrypto_serpent_calculate_reverse_linear_transformation_and_substitution5(
   internal_context->expanded_key,
   4 * 30,
   value0,
   value2,
   value4,
   value1,
   value3 );

  libfcrypto_serpent_calculate_reverse_linear_transformation_and_substitution4(
   internal_context->expanded_key,
   4 * 29,
   value2,
   value3,
   value0,
   value4,
   value1 );

  libfcrypto_serpent_calculate_reverse_linear_transformation_and_substitution3(
   internal_context->expanded_key,
   4 * 28,
   value2,
   value0,
   value1,
   value4,
   value3 );

  libfcrypto_serpent_calculate_reverse_linear_transformation_and_substitution2(
   internal_context->expanded_key,
   4 * 27,
   value1,
   value2,
   value3,
   value4,
   value0 );

  libfcrypto_serpent_calculate_reverse_linear_transformation_and_substitution1(
   internal_context->expanded_key,
   4 * 26,
   value2,
   value0,
   value4,
   value3,
   value1 );

  libfcrypto_serpent_calculate_reverse_linear_transformation_and_substitution0(
   internal_context->expanded_key,
   4 * 25,
   value1,
   value0,
   value4,
   value3,
   value2 );

  libfcrypto_serpent_calculate_reverse_linear_transformation_and_substitution7(
   internal_context->expanded_key,
   4 * 24,
   value4,
   value2,
   value0,
   value1,
   value3 );

  libfcrypto_serpent_calculate_reverse_linear_transformation_and_substitution6(
   internal_context->expanded_key,
   4 * 23,
   value2,
   value1,
   value4,
   value3,
   value0 );

  libfcrypto_serpent_calculate_reverse_linear_transformation_and_substitution5(
   internal_context->expanded_key,
   4 * 22,
   value4,
   value0,
   value3,
   value2,
   value1 );

  libfcrypto_serpent_calculate_reverse_linear_transformation_and_substitution4(
   internal_context->expanded_key,
   4 * 21,
   value0,
   value1,
   value4,
   value3,
   value2 );

  libfcrypto_serpent_calculate_reverse_linear_transformation_and_substitution3(
   internal_context->expanded_key,
   4 * 20,
   value0,
   value4,
   value2,
   value3,
   value1 );

  libfcrypto_serpent_calculate_reverse_linear_transformation_and_substitution2(
   internal_context->expanded_key,
   4 * 19,
   value2,
   value0,
   value1,
   value3,
   value4 );

  libfcrypto_serpent_calculate_reverse_linear_transformation_and_substitution1(
   internal_context->expanded_key,
   4 * 18,
   value0,
   value4,
   value3,
   value1,
   value2 );

  libfcrypto_serpent_calculate_reverse_linear_transformation_and_substitution0(
   internal_context->expanded_key,
   4 * 17,
   value2,
   value4,
   value3,
   value1,
   value0 );

  libfcrypto_serpent_calculate_reverse_linear_transformation_and_substitution7(
   internal_context->expanded_key,
   4 * 16,
   value3,
   value0,
   value4,
   value2,
   value1 );

  libfcrypto_serpent_calculate_reverse_linear_transformation_and_substitution6(
   internal_context->expanded_key,
   4 * 15,
   value0,
   value2,
   value3,
   value1,
   value4 );

  libfcrypto_serpent_calculate_reverse_linear_transformation_and_substitution5(
   internal_context->expanded_key,
   4 * 14,
   value3,
   value4,
   value1,
   value0,
   value2 );

  libfcrypto_serpent_calculate_reverse_linear_transformation_and_substitution4(
   internal_context->expanded_key,
   4 * 13,
   value4,
   value2,
   value3,
   value1,
   value0 );

  libfcrypto_serpent_calculate_reverse_linear_transformation_and_substitution3(
   internal_context->expanded_key,
   4 * 12,
   value4,
   value3,
   value0,
   value1,
   value2 );

  libfcrypto_serpent_calculate_reverse_linear_transformation_and_substitution2(
   internal_context->expanded_key,
   4 * 11,
   value0,
   value4,
   value2,
   value1,
   value3 );

  libfcrypto_serpent_calculate_reverse_linear_transformation_and_substitution1(
   internal_context->expanded_key,
   4 * 10,
   value4,
   value3,
   value1,
   value2,
   value0 );

  libfcrypto_serpent_calculate_reverse_linear_transformation_and_substitution0(
   internal_context->expanded_key,
   4 * 9,
   value0,
   value3,
   value1,
   value2,
   value4 );

  libfcrypto_serpent_calculate_reverse_linear_transformation_and_substitution7(
   internal_context->expanded_key,
   4 * 8,
   value1,
   value4,
   value3,
   value0,
   value2 );

  libfcrypto_serpent_calculate_reverse_linear_transformation_and_substitution6(
   internal_context->expanded_key,
   4 * 7,
   value4,
   value0,
   value1,
   value2,
   value3 );

  libfcrypto_serpent_calculate_reverse_linear_transformation_and_substitution5(
   internal_context->expanded_key,
   4 * 6,
   value1,
   value3,
   value2,
   value4,
   value0 );

  libfcrypto_serpent_calculate_reverse_linear_transformation_and_substitution4(
   internal_context->expanded_key,
   4 * 5,
   value3,
   value0,
   value1,
   value2,
   value4 );

  libfcrypto_serpent_calculate_reverse_linear_transformation_and_substitution3(
   internal_context->expanded_key,
   4 * 4,
   value3,
   value1,
   value4,
   value2,
   value0 );

  libfcrypto_serpent_calculate_reverse_linear_transformation_and_substitution2(
   internal_context->expanded_key,
   4 * 3,
   value4,
   value3,
   value0,
   value2,
   value1 );

  libfcrypto_serpent_calculate_reverse_linear_transformation_and_substitution1(
   internal_context->expanded_key,
   4 * 2,
   value3,
   value1,
   value2,
   value0,
   value4 );

  libfcrypto_serpent_calculate_reverse_linear_transformation_and_substitution0(
   internal_context->expanded_key,
   4 * 1,
   value4,
   value1,
   value2,
   value0,
   value3 );

  value2 ^= internal_context->expanded_key[ 0 ];
  value3 ^= internal_context->expanded_key[ 1 ];
  value1 ^= internal_context->expanded_key[ 2 ];
  value4 ^= internal_context->expanded_key[ 3 ];

  byte_stream_copy_from_uint32_little_endian(
   &( output_data[ 0 ] ),
   value2 );

  byte_stream_copy_from_uint32_little_endian(
   &( output_data[ 4 ] ),
   value3 );

  byte_stream_copy_from_uint32_little_endian(
   &( output_data[ 8 ] ),
   value1 );

  byte_stream_copy_from_uint32_little_endian(
   &( output_data[ 12 ] ),
   value4 );

  return( 1 );
}

/* De- or encrypts a block of data using Serpent-CBC (Cipher Block Chaining)
 * The size must be a multitude of the Serpent block size (16 byte)
 * Returns 1 if successful or -1 on error
 */
int libfcrypto_serpent_crypt_cbc(
     libfcrypto_serpent_context_t *context,
     int mode,
     const uint8_t *initialization_vector,
     size_t initialization_vector_size,
     const uint8_t *input_data,
     size_t input_data_size,
     uint8_t *output_data,
     size_t output_data_size,
     libcerror_error_t **error )
{
  uint8_t block_data[ 16 ];
  uint8_t internal_initialization_vector[ 16 ];

  static char *function = "libfcrypto_serpent_context_crypt_cbc";
  size_t data_offset    = 0;

#if !defined( LIBFCRYPTO_UNFOLLED_LOOPS )
  uint8_t block_index   = 0;
#endif

  if( context == NULL )
  {
    libcerror_error_set(
     error,
     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,
     "%s: invalid context.",
     function );

    return( -1 );
  }
  if( initialization_vector == NULL )
  {
    libcerror_error_set(
     error,
     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,
     "%s: invalid initialization vector.",
     function );

    return( -1 );
  }
  if( initialization_vector_size != 16 )
  {
    libcerror_error_set(
     error,
     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
     LIBCERROR_ARGUMENT_ERROR_VALUE_OUT_OF_BOUNDS,
     "%s: invalid initialization vector size value out of bounds.",
     function );

    return( -1 );
  }
  if( ( mode != LIBFCRYPTO_SERPENT_CRYPT_MODE_ENCRYPT )
   && ( mode != LIBFCRYPTO_SERPENT_CRYPT_MODE_DECRYPT ) )
  {
    libcerror_error_set(
     error,
     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
     LIBCERROR_ARGUMENT_ERROR_UNSUPPORTED_VALUE,
     "%s: unsupported mode.",
     function );

    return( -1 );
  }
  if( input_data == NULL )
  {
    libcerror_error_set(
     error,
     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,
     "%s: invalid input data.",
     function );

    return( -1 );
  }
  /* Check if the input data size is a multitude of 16-byte
   */
  if( ( ( input_data_size & (size_t) 0x0f ) != 0 )
   || ( input_data_size < 16 )
   || ( input_data_size > (size_t) SSIZE_MAX ) )
  {
    libcerror_error_set(
     error,
     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
     LIBCERROR_ARGUMENT_ERROR_VALUE_OUT_OF_BOUNDS,
     "%s: invalid input data size value out of bounds.",
     function );

    return( -1 );
  }
  if( output_data == NULL )
  {
    libcerror_error_set(
     error,
     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,
     "%s: invalid output data.",
     function );

    return( -1 );
  }
  if( ( output_data_size < input_data_size )
   || ( output_data_size > (size_t) SSIZE_MAX ) )
  {
    libcerror_error_set(
     error,
     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
     LIBCERROR_ARGUMENT_ERROR_VALUE_OUT_OF_BOUNDS,
     "%s: invalid output data size value out of bounds.",
     function );

    return( -1 );
  }
  if( memory_copy(
       internal_initialization_vector,
       initialization_vector,
       16 ) == NULL )
  {
    libcerror_error_set(
     error,
     LIBCERROR_ERROR_DOMAIN_MEMORY,
     LIBCERROR_MEMORY_ERROR_COPY_FAILED,
     "%s: unable to copy initialization vector.",
     function );

    goto on_error;
  }
  while( data_offset < input_data_size )
  {
    if( mode == LIBFCRYPTO_SERPENT_CRYPT_MODE_ENCRYPT )
    {
#if defined( LIBFCRYPTO_UNFOLLED_LOOPS )
      block_data[ 0 ]  = input_data[ data_offset++ ] ^ internal_initialization_vector[ 0 ];
      block_data[ 1 ]  = input_data[ data_offset++ ] ^ internal_initialization_vector[ 1 ];
      block_data[ 2 ]  = input_data[ data_offset++ ] ^ internal_initialization_vector[ 2 ];
      block_data[ 3 ]  = input_data[ data_offset++ ] ^ internal_initialization_vector[ 3 ];
      block_data[ 4 ]  = input_data[ data_offset++ ] ^ internal_initialization_vector[ 4 ];
      block_data[ 5 ]  = input_data[ data_offset++ ] ^ internal_initialization_vector[ 5 ];
      block_data[ 6 ]  = input_data[ data_offset++ ] ^ internal_initialization_vector[ 6 ];
      block_data[ 7 ]  = input_data[ data_offset++ ] ^ internal_initialization_vector[ 7 ];
      block_data[ 8 ]  = input_data[ data_offset++ ] ^ internal_initialization_vector[ 8 ];
      block_data[ 9 ]  = input_data[ data_offset++ ] ^ internal_initialization_vector[ 9 ];
      block_data[ 10 ] = input_data[ data_offset++ ] ^ internal_initialization_vector[ 10 ];
      block_data[ 11 ] = input_data[ data_offset++ ] ^ internal_initialization_vector[ 11 ];
      block_data[ 12 ] = input_data[ data_offset++ ] ^ internal_initialization_vector[ 12 ];
      block_data[ 13 ] = input_data[ data_offset++ ] ^ internal_initialization_vector[ 13 ];
      block_data[ 14 ] = input_data[ data_offset++ ] ^ internal_initialization_vector[ 14 ];
      block_data[ 15 ] = input_data[ data_offset++ ] ^ internal_initialization_vector[ 15 ];
#else
      for( block_index = 0;
           block_index < 16;
           block_index++ )
      {
        block_data[ block_index ] = input_data[ data_offset++ ] ^ internal_initialization_vector[ block_index ];
      }
#endif
      data_offset -= 16;

      if( libfcrypto_internal_serpent_context_encrypt_block(
           (libfcrypto_internal_serpent_context_t *) context,
           block_data,
           16,
           &( output_data[ data_offset ] ),
           16,
           error ) != 1 )
      {
        libcerror_error_set(
         error,
         LIBCERROR_ERROR_DOMAIN_ENCRYPTION,
         LIBCERROR_ENCRYPTION_ERROR_GENERIC,
         "%s: unable to encrypt input data.",
         function );

        goto on_error;
      }
      if( memory_copy(
           internal_initialization_vector,
           &( output_data[ data_offset ] ),
           16 ) == NULL )
      {
        libcerror_error_set(
         error,
         LIBCERROR_ERROR_DOMAIN_MEMORY,
         LIBCERROR_MEMORY_ERROR_COPY_FAILED,
         "%s: unable to copy encrypted output data to initialization vector.",
         function );

        goto on_error;
      }
    }
    else
    {
      if( libfcrypto_internal_serpent_context_decrypt_block(
           (libfcrypto_internal_serpent_context_t *) context,
           &( input_data[ data_offset ] ),
           16,
           &( output_data[ data_offset ] ),
           16,
           error ) != 1 )
      {
        libcerror_error_set(
         error,
         LIBCERROR_ERROR_DOMAIN_ENCRYPTION,
         LIBCERROR_ENCRYPTION_ERROR_GENERIC,
         "%s: unable to decrypt input data.",
         function );

        goto on_error;
      }
#if defined( LIBFCRYPTO_UNFOLLED_LOOPS )
      output_data[ data_offset++ ] ^= internal_initialization_vector[ 0 ];
      output_data[ data_offset++ ] ^= internal_initialization_vector[ 1 ];
      output_data[ data_offset++ ] ^= internal_initialization_vector[ 2 ];
      output_data[ data_offset++ ] ^= internal_initialization_vector[ 3 ];
      output_data[ data_offset++ ] ^= internal_initialization_vector[ 4 ];
      output_data[ data_offset++ ] ^= internal_initialization_vector[ 5 ];
      output_data[ data_offset++ ] ^= internal_initialization_vector[ 6 ];
      output_data[ data_offset++ ] ^= internal_initialization_vector[ 7 ];
      output_data[ data_offset++ ] ^= internal_initialization_vector[ 8 ];
      output_data[ data_offset++ ] ^= internal_initialization_vector[ 9 ];
      output_data[ data_offset++ ] ^= internal_initialization_vector[ 10 ];
      output_data[ data_offset++ ] ^= internal_initialization_vector[ 11 ];
      output_data[ data_offset++ ] ^= internal_initialization_vector[ 12 ];
      output_data[ data_offset++ ] ^= internal_initialization_vector[ 13 ];
      output_data[ data_offset++ ] ^= internal_initialization_vector[ 14 ];
      output_data[ data_offset++ ] ^= internal_initialization_vector[ 15 ];
#else
      for( block_index = 0;
           block_index < 16;
           block_index++ )
      {
        output_data[ data_offset++ ] ^= internal_initialization_vector[ block_index ];
      }
#endif
      data_offset -= 16;

      if( memory_copy(
           internal_initialization_vector,
           &( input_data[ data_offset ] ),
           16 ) == NULL )
      {
        libcerror_error_set(
         error,
         LIBCERROR_ERROR_DOMAIN_MEMORY,
         LIBCERROR_MEMORY_ERROR_COPY_FAILED,
         "%s: unable to copy encrypted input data to initialization vector.",
         function );

        goto on_error;
      }
    }
    data_offset += 16;
  }
  if( memory_set(
       internal_initialization_vector,
       0,
       16 ) == NULL )
  {
    libcerror_error_set(
     error,
     LIBCERROR_ERROR_DOMAIN_MEMORY,
     LIBCERROR_MEMORY_ERROR_SET_FAILED,
     "%s: unable to clear initialization vector.",
     function );

    goto on_error;
  }
  if( memory_set(
       block_data,
       0,
       16 ) == NULL )
  {
    libcerror_error_set(
     error,
     LIBCERROR_ERROR_DOMAIN_MEMORY,
     LIBCERROR_MEMORY_ERROR_SET_FAILED,
     "%s: unable to clear block data.",
     function );

    goto on_error;
  }
  return( 1 );

on_error:
  memory_set(
   internal_initialization_vector,
   0,
   16 );

  memory_set(
   block_data,
   0,
   16 );

  return( -1 );
}

/* De- or encrypts a block of data using Serpent-ECB (Electronic CodeBook)
 * The size must be a multitude of the Serpent block size (16 byte)
 * Returns 1 if successful or -1 on error
 */
int libfcrypto_serpent_crypt_ecb(
     libfcrypto_serpent_context_t *context,
     int mode,
     const uint8_t *input_data,
     size_t input_data_size,
     uint8_t *output_data,
     size_t output_data_size,
     libcerror_error_t **error )
{
  static char *function = "libfcrypto_serpent_context_crypt_ecb";
  size_t data_offset    = 0;

  if( context == NULL )
  {
    libcerror_error_set(
     error,
     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,
     "%s: invalid context.",
     function );

    return( -1 );
  }
  if( ( mode != LIBFCRYPTO_SERPENT_CRYPT_MODE_ENCRYPT )
   && ( mode != LIBFCRYPTO_SERPENT_CRYPT_MODE_DECRYPT ) )
  {
    libcerror_error_set(
     error,
     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
     LIBCERROR_ARGUMENT_ERROR_UNSUPPORTED_VALUE,
     "%s: unsupported mode.",
     function );

    return( -1 );
  }
  if( input_data == NULL )
  {
    libcerror_error_set(
     error,
     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,
     "%s: invalid input data.",
     function );

    return( -1 );
  }
  /* Check if the input data size is a multitude of 16-byte
   */
  if( ( ( input_data_size & (size_t) 0x0f ) != 0 )
   || ( input_data_size < 16 )
   || ( input_data_size > (size_t) SSIZE_MAX ) )
  {
    libcerror_error_set(
     error,
     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
     LIBCERROR_ARGUMENT_ERROR_VALUE_OUT_OF_BOUNDS,
     "%s: invalid input data size value out of bounds.",
     function );

    return( -1 );
  }
  if( output_data == NULL )
  {
    libcerror_error_set(
     error,
     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,
     "%s: invalid output data.",
     function );

    return( -1 );
  }
  if( ( output_data_size < input_data_size )
   || ( output_data_size > (size_t) SSIZE_MAX ) )
  {
    libcerror_error_set(
     error,
     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
     LIBCERROR_ARGUMENT_ERROR_VALUE_OUT_OF_BOUNDS,
     "%s: invalid output data size value out of bounds.",
     function );

    return( -1 );
  }
  while( data_offset < input_data_size )
  {
    if( mode == LIBFCRYPTO_SERPENT_CRYPT_MODE_ENCRYPT )
    {
      if( libfcrypto_internal_serpent_context_encrypt_block(
           (libfcrypto_internal_serpent_context_t *) context,
           &( input_data[ data_offset ] ),
           16,
           &( output_data[ data_offset ] ),
           16,
           error ) != 1 )
      {
        libcerror_error_set(
         error,
         LIBCERROR_ERROR_DOMAIN_ENCRYPTION,
         LIBCERROR_ENCRYPTION_ERROR_GENERIC,
         "%s: unable to encrypt input data.",
         function );

        return( -1 );
      }
    }
    else
    {
      if( libfcrypto_internal_serpent_context_decrypt_block(
           (libfcrypto_internal_serpent_context_t *) context,
           &( input_data[ data_offset ] ),
           16,
           &( output_data[ data_offset ] ),
           16,
           error ) != 1 )
      {
        libcerror_error_set(
         error,
         LIBCERROR_ERROR_DOMAIN_ENCRYPTION,
         LIBCERROR_ENCRYPTION_ERROR_GENERIC,
         "%s: unable to decrypt input data.",
         function );

        return( -1 );
      }
    }
    data_offset += 16;
  }
  return( 1 );
}


Coverage Report

Created: 2025-06-24 07:14