387 lines
9.7 KiB
C
387 lines
9.7 KiB
C
/* des.c */
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/*
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This file is part of the ARM-Crypto-Lib.
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Copyright (C) 2006-2010 Daniel Otte (daniel.otte@rub.de)
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* \file des.c
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* \author Daniel Otte
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* \email daniel.otte@rub.de
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* \date 2007-06-16
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* \brief DES and EDE-DES implementation
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* \license GPLv3 or later
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*
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*/
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#include <stdint.h>
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#include <string.h>
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const uint8_t sbox[256] = {
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/* S-box 1 */
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0xE4, 0xD1, 0x2F, 0xB8, 0x3A, 0x6C, 0x59, 0x07,
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0x0F, 0x74, 0xE2, 0xD1, 0xA6, 0xCB, 0x95, 0x38,
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0x41, 0xE8, 0xD6, 0x2B, 0xFC, 0x97, 0x3A, 0x50,
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0xFC, 0x82, 0x49, 0x17, 0x5B, 0x3E, 0xA0, 0x6D,
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/* S-box 2 */
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0xF1, 0x8E, 0x6B, 0x34, 0x97, 0x2D, 0xC0, 0x5A,
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0x3D, 0x47, 0xF2, 0x8E, 0xC0, 0x1A, 0x69, 0xB5,
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0x0E, 0x7B, 0xA4, 0xD1, 0x58, 0xC6, 0x93, 0x2F,
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0xD8, 0xA1, 0x3F, 0x42, 0xB6, 0x7C, 0x05, 0xE9,
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/* S-box 3 */
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0xA0, 0x9E, 0x63, 0xF5, 0x1D, 0xC7, 0xB4, 0x28,
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0xD7, 0x09, 0x34, 0x6A, 0x28, 0x5E, 0xCB, 0xF1,
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0xD6, 0x49, 0x8F, 0x30, 0xB1, 0x2C, 0x5A, 0xE7,
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0x1A, 0xD0, 0x69, 0x87, 0x4F, 0xE3, 0xB5, 0x2C,
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/* S-box 4 */
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0x7D, 0xE3, 0x06, 0x9A, 0x12, 0x85, 0xBC, 0x4F,
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0xD8, 0xB5, 0x6F, 0x03, 0x47, 0x2C, 0x1A, 0xE9,
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0xA6, 0x90, 0xCB, 0x7D, 0xF1, 0x3E, 0x52, 0x84,
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0x3F, 0x06, 0xA1, 0xD8, 0x94, 0x5B, 0xC7, 0x2E,
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/* S-box 5 */
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0x2C, 0x41, 0x7A, 0xB6, 0x85, 0x3F, 0xD0, 0xE9,
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0xEB, 0x2C, 0x47, 0xD1, 0x50, 0xFA, 0x39, 0x86,
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0x42, 0x1B, 0xAD, 0x78, 0xF9, 0xC5, 0x63, 0x0E,
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0xB8, 0xC7, 0x1E, 0x2D, 0x6F, 0x09, 0xA4, 0x53,
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/* S-box 6 */
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0xC1, 0xAF, 0x92, 0x68, 0x0D, 0x34, 0xE7, 0x5B,
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0xAF, 0x42, 0x7C, 0x95, 0x61, 0xDE, 0x0B, 0x38,
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0x9E, 0xF5, 0x28, 0xC3, 0x70, 0x4A, 0x1D, 0xB6,
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0x43, 0x2C, 0x95, 0xFA, 0xBE, 0x17, 0x60, 0x8D,
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/* S-box 7 */
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0x4B, 0x2E, 0xF0, 0x8D, 0x3C, 0x97, 0x5A, 0x61,
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0xD0, 0xB7, 0x49, 0x1A, 0xE3, 0x5C, 0x2F, 0x86,
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0x14, 0xBD, 0xC3, 0x7E, 0xAF, 0x68, 0x05, 0x92,
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0x6B, 0xD8, 0x14, 0xA7, 0x95, 0x0F, 0xE2, 0x3C,
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/* S-box 8 */
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0xD2, 0x84, 0x6F, 0xB1, 0xA9, 0x3E, 0x50, 0xC7,
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0x1F, 0xD8, 0xA3, 0x74, 0xC5, 0x6B, 0x0E, 0x92,
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0x7B, 0x41, 0x9C, 0xE2, 0x06, 0xAD, 0xF3, 0x58,
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0x21, 0xE7, 0x4A, 0x8D, 0xFC, 0x90, 0x35, 0x6B
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};
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const uint8_t e_permtab[] ={
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4, 6, /* 4 bytes in 6 bytes out*/
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32, 1, 2, 3, 4, 5,
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4, 5, 6, 7, 8, 9,
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8, 9, 10, 11, 12, 13,
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12, 13, 14, 15, 16, 17,
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16, 17, 18, 19, 20, 21,
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20, 21, 22, 23, 24, 25,
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24, 25, 26, 27, 28, 29,
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28, 29, 30, 31, 32, 1
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};
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const uint8_t p_permtab[] ={
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4, 4, /* 32 bit -> 32 bit */
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16, 7, 20, 21,
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29, 12, 28, 17,
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1, 15, 23, 26,
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5, 18, 31, 10,
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2, 8, 24, 14,
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32, 27, 3, 9,
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19, 13, 30, 6,
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22, 11, 4, 25
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};
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const uint8_t ip_permtab[] ={
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8, 8, /* 64 bit -> 64 bit */
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58, 50, 42, 34, 26, 18, 10, 2,
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60, 52, 44, 36, 28, 20, 12, 4,
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62, 54, 46, 38, 30, 22, 14, 6,
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64, 56, 48, 40, 32, 24, 16, 8,
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57, 49, 41, 33, 25, 17, 9, 1,
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59, 51, 43, 35, 27, 19, 11, 3,
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61, 53, 45, 37, 29, 21, 13, 5,
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63, 55, 47, 39, 31, 23, 15, 7
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};
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const uint8_t inv_ip_permtab[] ={
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8, 8, /* 64 bit -> 64 bit */
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40, 8, 48, 16, 56, 24, 64, 32,
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39, 7, 47, 15, 55, 23, 63, 31,
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38, 6, 46, 14, 54, 22, 62, 30,
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37, 5, 45, 13, 53, 21, 61, 29,
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36, 4, 44, 12, 52, 20, 60, 28,
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35, 3, 43, 11, 51, 19, 59, 27,
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34, 2, 42, 10, 50, 18, 58, 26,
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33, 1, 41, 9, 49, 17, 57, 25
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};
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const uint8_t pc1_permtab[] ={
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8, 7, /* 64 bit -> 56 bit*/
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57, 49, 41, 33, 25, 17, 9,
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1, 58, 50, 42, 34, 26, 18,
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10, 2, 59, 51, 43, 35, 27,
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19, 11, 3, 60, 52, 44, 36,
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63, 55, 47, 39, 31, 23, 15,
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7, 62, 54, 46, 38, 30, 22,
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14, 6, 61, 53, 45, 37, 29,
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21, 13, 5, 28, 20, 12, 4
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};
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const uint8_t pc2_permtab[] ={
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7, 6, /* 56 bit -> 48 bit */
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14, 17, 11, 24, 1, 5,
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3, 28, 15, 6, 21, 10,
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23, 19, 12, 4, 26, 8,
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16, 7, 27, 20, 13, 2,
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41, 52, 31, 37, 47, 55,
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30, 40, 51, 45, 33, 48,
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44, 49, 39, 56, 34, 53,
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46, 42, 50, 36, 29, 32
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};
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const uint8_t splitin6bitword_permtab[] = {
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8, 8, /* 64 bit -> 64 bit */
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64, 64, 1, 6, 2, 3, 4, 5,
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64, 64, 7, 12, 8, 9, 10, 11,
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64, 64, 13, 18, 14, 15, 16, 17,
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64, 64, 19, 24, 20, 21, 22, 23,
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64, 64, 25, 30, 26, 27, 28, 29,
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64, 64, 31, 36, 32, 33, 34, 35,
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64, 64, 37, 42, 38, 39, 40, 41,
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64, 64, 43, 48, 44, 45, 46, 47
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};
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const uint8_t shiftkey_permtab[] = {
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7, 7, /* 56 bit -> 56 bit */
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2, 3, 4, 5, 6, 7, 8, 9,
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10, 11, 12, 13, 14, 15, 16, 17,
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18, 19, 20, 21, 22, 23, 24, 25,
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26, 27, 28, 1,
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30, 31, 32, 33, 34, 35, 36, 37,
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38, 39, 40, 41, 42, 43, 44, 45,
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46, 47, 48, 49, 50, 51, 52, 53,
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54, 55, 56, 29
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};
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const uint8_t shiftkeyinv_permtab[] = {
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7, 7,
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28, 1, 2, 3, 4, 5, 6, 7,
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8, 9, 10, 11, 12, 13, 14, 15,
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16, 17, 18, 19, 20, 21, 22, 23,
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24, 25, 26, 27,
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56, 29, 30, 31, 32, 33, 34, 35,
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36, 37, 38, 39, 40, 41, 42, 43,
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44, 45, 46, 47, 48, 49, 50, 51,
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52, 53, 54, 55
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};
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/*
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1 0
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1 0
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2 1
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2 1
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2 1
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2 1
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2 1
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2 1
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----
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1 0
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2 1
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2 1
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2 1
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2 1
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2 1
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2 1
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1 0
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*/
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#define ROTTABLE 0x7EFC
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#define ROTTABLE_INV 0x3F7E
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/******************************************************************************/
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void permute(const uint8_t *ptable, const uint8_t *in, uint8_t *out){
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uint8_t ob; /* in-bytes and out-bytes */
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uint8_t byte, bit; /* counter for bit and byte */
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ob = ptable[1];
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ptable = &(ptable[2]);
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for(byte=0; byte<ob; ++byte){
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uint8_t x,t=0;
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for(bit=0; bit<8; ++bit){
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x=*ptable++ -1 ;
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t<<=1;
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if((in[x/8]) & (0x80>>(x%8)) ){
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t|=0x01;
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}
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}
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out[byte]=t;
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}
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}
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/******************************************************************************/
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void changeendian32(uint32_t * a){
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*a = (*a & 0x000000FF) << 24 |
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(*a & 0x0000FF00) << 8 |
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(*a & 0x00FF0000) >> 8 |
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(*a & 0xFF000000) >> 24;
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}
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/******************************************************************************/
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static inline
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void shiftkey(uint8_t *key){
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uint8_t k[7];
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memcpy(k, key, 7);
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permute((uint8_t*)shiftkey_permtab, k, key);
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}
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/******************************************************************************/
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static inline
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void shiftkey_inv(uint8_t *key){
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uint8_t k[7];
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memcpy(k, key, 7);
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permute((uint8_t*)shiftkeyinv_permtab, k, key);
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}
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/******************************************************************************/
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static inline
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uint64_t splitin6bitwords(uint64_t a){
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uint64_t ret=0;
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a &= 0x0000ffffffffffffLL;
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permute((uint8_t*)splitin6bitword_permtab, (uint8_t*)&a, (uint8_t*)&ret);
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return ret;
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}
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/******************************************************************************/
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static inline
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uint8_t substitute(uint8_t a, uint8_t * sbp){
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uint8_t x;
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x = sbp[a>>1];
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x = (a&1)?x&0x0F:x>>4;
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return x;
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}
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/******************************************************************************/
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uint32_t des_f(uint32_t r, uint8_t* kr){
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uint8_t i;
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uint32_t t=0,ret;
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uint64_t data;
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uint8_t *sbp; /* sboxpointer */
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permute((uint8_t*)e_permtab, (uint8_t*)&r, (uint8_t*)&data);
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for(i=0; i<7; ++i)
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((uint8_t*)&data)[i] ^= kr[i];
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/* Sbox substitution */
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data = splitin6bitwords(data);
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sbp=(uint8_t*)sbox;
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for(i=0; i<8; ++i){
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uint8_t x;
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x = substitute(((uint8_t*)&data)[i], sbp);
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t<<=4;
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t |= x;
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sbp += 32;
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}
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changeendian32(&t);
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permute((uint8_t*)p_permtab,(uint8_t*)&t, (uint8_t*)&ret);
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return ret;
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}
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/******************************************************************************/
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void des_enc(void* out, const void* in, const void* key){
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#define R (data.v32[1])
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#define L (data.v32[0])
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uint8_t kr[6],k[7];
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uint8_t i;
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union {
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uint8_t v8[8];
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uint32_t v32[2];
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} data;
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permute((uint8_t*)ip_permtab, (uint8_t*)in, data.v8);
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permute((uint8_t*)pc1_permtab, (const uint8_t*)key, k);
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for(i=0; i<8; ++i){
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shiftkey(k);
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if(ROTTABLE&((1<<((i<<1)+0))) )
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shiftkey(k);
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permute((uint8_t*)pc2_permtab, k, kr);
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L ^= des_f(R, kr);
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shiftkey(k);
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if(ROTTABLE&((1<<((i<<1)+1))) )
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shiftkey(k);
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permute((uint8_t*)pc2_permtab, k, kr);
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R ^= des_f(L, kr);
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}
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/* L <-> R*/
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R ^= L;
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L ^= R;
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R ^= L;
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permute((uint8_t*)inv_ip_permtab, data.v8, (uint8_t*)out);
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}
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/******************************************************************************/
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void des_dec(void* out, const void* in, const uint8_t* key){
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uint8_t kr[6],k[7];
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union {
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uint8_t v8[8];
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uint32_t v32[2];
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} data;
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int8_t i;
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permute((uint8_t*)ip_permtab, (uint8_t*)in, data.v8);
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permute((uint8_t*)pc1_permtab, (const uint8_t*)key, k);
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for(i=7; i>=0; --i){
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permute((uint8_t*)pc2_permtab, k, kr);
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L ^= des_f(R, kr);
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shiftkey_inv(k);
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if(ROTTABLE&((1<<((i<<1)+1))) ){
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shiftkey_inv(k);
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}
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permute((uint8_t*)pc2_permtab, k, kr);
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R ^= des_f(L, kr);
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shiftkey_inv(k);
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if(ROTTABLE&((1<<((i<<1)+0))) ){
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shiftkey_inv(k);
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}
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}
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/* L <-> R*/
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R ^= L;
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L ^= R;
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R ^= L;
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permute((uint8_t*)inv_ip_permtab, data.v8, (uint8_t*)out);
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}
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/******************************************************************************/
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void tdes_enc(void* out, void* in, const void* key){
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des_enc(out, in, (uint8_t*)key + 0);
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des_dec(out, out, (uint8_t*)key + 8);
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des_enc(out, out, (uint8_t*)key +16);
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}
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/******************************************************************************/
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void tdes_dec(void* out, void* in, const uint8_t* key){
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des_dec(out, in, (uint8_t*)key +16);
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des_enc(out, out, (uint8_t*)key + 8);
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des_dec(out, out, (uint8_t*)key + 0);
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}
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/******************************************************************************/
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