| /* des.c --- DES and Triple-DES encryption/decryption Algorithm |
| * Copyright (C) 1998-1999, 2001-2007, 2009-2020 Free Software Foundation, Inc. |
| * |
| * This file is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published |
| * by the Free Software Foundation; either version 2, or (at your |
| * option) any later version. |
| * |
| * This file 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 General Public License |
| * along with this file; if not, see <https://www.gnu.org/licenses/>. |
| * |
| */ |
| |
| /* Adapted for gnulib by Simon Josefsson, based on Libgcrypt. */ |
| |
| /* |
| * For a description of triple encryption, see: |
| * Bruce Schneier: Applied Cryptography. Second Edition. |
| * John Wiley & Sons, 1996. ISBN 0-471-12845-7. Pages 358 ff. |
| * This implementation is according to the definition of DES in FIPS |
| * PUB 46-2 from December 1993. |
| * |
| * Written by Michael Roth <mroth@nessie.de>, September 1998 |
| */ |
| |
| /* |
| * U S A G E |
| * =========== |
| * |
| * For DES or Triple-DES encryption/decryption you must initialize a proper |
| * encryption context with a key. |
| * |
| * A DES key is 64bit wide but only 56bits of the key are used. The remaining |
| * bits are parity bits and they will _not_ checked in this implementation, but |
| * simply ignored. |
| * |
| * For Triple-DES you could use either two 64bit keys or three 64bit keys. |
| * The parity bits will _not_ checked, too. |
| * |
| * After initializing a context with a key you could use this context to |
| * encrypt or decrypt data in 64bit blocks in Electronic Codebook Mode. |
| * |
| * DES Example |
| * ----------- |
| * unsigned char key[8]; |
| * unsigned char plaintext[8]; |
| * unsigned char ciphertext[8]; |
| * unsigned char recoverd[8]; |
| * gl_des_ctx context; |
| * |
| * // Fill 'key' and 'plaintext' with some data |
| * .... |
| * |
| * // Set up the DES encryption context |
| * gl_des_setkey(&context, key); |
| * |
| * // Encrypt the plaintext |
| * des_ecb_encrypt(&context, plaintext, ciphertext); |
| * |
| * // To recover the original plaintext from ciphertext use: |
| * des_ecb_decrypt(&context, ciphertext, recoverd); |
| * |
| * |
| * Triple-DES Example |
| * ------------------ |
| * unsigned char key1[8]; |
| * unsigned char key2[8]; |
| * unsigned char key3[8]; |
| * unsigned char plaintext[8]; |
| * unsigned char ciphertext[8]; |
| * unsigned char recoverd[8]; |
| * gl_3des_ctx context; |
| * |
| * // If you would like to use two 64bit keys, fill 'key1' and'key2' |
| * // then setup the encryption context: |
| * gl_3des_set2keys(&context, key1, key2); |
| * |
| * // To use three 64bit keys with Triple-DES use: |
| * gl_3des_set3keys(&context, key1, key2, key3); |
| * |
| * // Encrypting plaintext with Triple-DES |
| * gl_3des_ecb_encrypt(&context, plaintext, ciphertext); |
| * |
| * // Decrypting ciphertext to recover the plaintext with Triple-DES |
| * gl_3des_ecb_decrypt(&context, ciphertext, recoverd); |
| */ |
| |
| |
| #include <config.h> |
| |
| #include "des.h" |
| |
| #include <stdio.h> |
| #include <string.h> /* memcpy, memcmp */ |
| |
| /* |
| * The s-box values are permuted according to the 'primitive function P' |
| * and are rotated one bit to the left. |
| */ |
| static const uint32_t sbox1[64] = { |
| 0x01010400, 0x00000000, 0x00010000, 0x01010404, 0x01010004, 0x00010404, |
| 0x00000004, 0x00010000, 0x00000400, 0x01010400, 0x01010404, 0x00000400, |
| 0x01000404, 0x01010004, 0x01000000, 0x00000004, 0x00000404, 0x01000400, |
| 0x01000400, 0x00010400, 0x00010400, 0x01010000, 0x01010000, 0x01000404, |
| 0x00010004, 0x01000004, 0x01000004, 0x00010004, 0x00000000, 0x00000404, |
| 0x00010404, 0x01000000, 0x00010000, 0x01010404, 0x00000004, 0x01010000, |
| 0x01010400, 0x01000000, 0x01000000, 0x00000400, 0x01010004, 0x00010000, |
| 0x00010400, 0x01000004, 0x00000400, 0x00000004, 0x01000404, 0x00010404, |
| 0x01010404, 0x00010004, 0x01010000, 0x01000404, 0x01000004, 0x00000404, |
| 0x00010404, 0x01010400, 0x00000404, 0x01000400, 0x01000400, 0x00000000, |
| 0x00010004, 0x00010400, 0x00000000, 0x01010004 |
| }; |
| |
| static const uint32_t sbox2[64] = { |
| 0x80108020, 0x80008000, 0x00008000, 0x00108020, 0x00100000, 0x00000020, |
| 0x80100020, 0x80008020, 0x80000020, 0x80108020, 0x80108000, 0x80000000, |
| 0x80008000, 0x00100000, 0x00000020, 0x80100020, 0x00108000, 0x00100020, |
| 0x80008020, 0x00000000, 0x80000000, 0x00008000, 0x00108020, 0x80100000, |
| 0x00100020, 0x80000020, 0x00000000, 0x00108000, 0x00008020, 0x80108000, |
| 0x80100000, 0x00008020, 0x00000000, 0x00108020, 0x80100020, 0x00100000, |
| 0x80008020, 0x80100000, 0x80108000, 0x00008000, 0x80100000, 0x80008000, |
| 0x00000020, 0x80108020, 0x00108020, 0x00000020, 0x00008000, 0x80000000, |
| 0x00008020, 0x80108000, 0x00100000, 0x80000020, 0x00100020, 0x80008020, |
| 0x80000020, 0x00100020, 0x00108000, 0x00000000, 0x80008000, 0x00008020, |
| 0x80000000, 0x80100020, 0x80108020, 0x00108000 |
| }; |
| |
| static const uint32_t sbox3[64] = { |
| 0x00000208, 0x08020200, 0x00000000, 0x08020008, 0x08000200, 0x00000000, |
| 0x00020208, 0x08000200, 0x00020008, 0x08000008, 0x08000008, 0x00020000, |
| 0x08020208, 0x00020008, 0x08020000, 0x00000208, 0x08000000, 0x00000008, |
| 0x08020200, 0x00000200, 0x00020200, 0x08020000, 0x08020008, 0x00020208, |
| 0x08000208, 0x00020200, 0x00020000, 0x08000208, 0x00000008, 0x08020208, |
| 0x00000200, 0x08000000, 0x08020200, 0x08000000, 0x00020008, 0x00000208, |
| 0x00020000, 0x08020200, 0x08000200, 0x00000000, 0x00000200, 0x00020008, |
| 0x08020208, 0x08000200, 0x08000008, 0x00000200, 0x00000000, 0x08020008, |
| 0x08000208, 0x00020000, 0x08000000, 0x08020208, 0x00000008, 0x00020208, |
| 0x00020200, 0x08000008, 0x08020000, 0x08000208, 0x00000208, 0x08020000, |
| 0x00020208, 0x00000008, 0x08020008, 0x00020200 |
| }; |
| |
| static const uint32_t sbox4[64] = { |
| 0x00802001, 0x00002081, 0x00002081, 0x00000080, 0x00802080, 0x00800081, |
| 0x00800001, 0x00002001, 0x00000000, 0x00802000, 0x00802000, 0x00802081, |
| 0x00000081, 0x00000000, 0x00800080, 0x00800001, 0x00000001, 0x00002000, |
| 0x00800000, 0x00802001, 0x00000080, 0x00800000, 0x00002001, 0x00002080, |
| 0x00800081, 0x00000001, 0x00002080, 0x00800080, 0x00002000, 0x00802080, |
| 0x00802081, 0x00000081, 0x00800080, 0x00800001, 0x00802000, 0x00802081, |
| 0x00000081, 0x00000000, 0x00000000, 0x00802000, 0x00002080, 0x00800080, |
| 0x00800081, 0x00000001, 0x00802001, 0x00002081, 0x00002081, 0x00000080, |
| 0x00802081, 0x00000081, 0x00000001, 0x00002000, 0x00800001, 0x00002001, |
| 0x00802080, 0x00800081, 0x00002001, 0x00002080, 0x00800000, 0x00802001, |
| 0x00000080, 0x00800000, 0x00002000, 0x00802080 |
| }; |
| |
| static const uint32_t sbox5[64] = { |
| 0x00000100, 0x02080100, 0x02080000, 0x42000100, 0x00080000, 0x00000100, |
| 0x40000000, 0x02080000, 0x40080100, 0x00080000, 0x02000100, 0x40080100, |
| 0x42000100, 0x42080000, 0x00080100, 0x40000000, 0x02000000, 0x40080000, |
| 0x40080000, 0x00000000, 0x40000100, 0x42080100, 0x42080100, 0x02000100, |
| 0x42080000, 0x40000100, 0x00000000, 0x42000000, 0x02080100, 0x02000000, |
| 0x42000000, 0x00080100, 0x00080000, 0x42000100, 0x00000100, 0x02000000, |
| 0x40000000, 0x02080000, 0x42000100, 0x40080100, 0x02000100, 0x40000000, |
| 0x42080000, 0x02080100, 0x40080100, 0x00000100, 0x02000000, 0x42080000, |
| 0x42080100, 0x00080100, 0x42000000, 0x42080100, 0x02080000, 0x00000000, |
| 0x40080000, 0x42000000, 0x00080100, 0x02000100, 0x40000100, 0x00080000, |
| 0x00000000, 0x40080000, 0x02080100, 0x40000100 |
| }; |
| |
| static const uint32_t sbox6[64] = { |
| 0x20000010, 0x20400000, 0x00004000, 0x20404010, 0x20400000, 0x00000010, |
| 0x20404010, 0x00400000, 0x20004000, 0x00404010, 0x00400000, 0x20000010, |
| 0x00400010, 0x20004000, 0x20000000, 0x00004010, 0x00000000, 0x00400010, |
| 0x20004010, 0x00004000, 0x00404000, 0x20004010, 0x00000010, 0x20400010, |
| 0x20400010, 0x00000000, 0x00404010, 0x20404000, 0x00004010, 0x00404000, |
| 0x20404000, 0x20000000, 0x20004000, 0x00000010, 0x20400010, 0x00404000, |
| 0x20404010, 0x00400000, 0x00004010, 0x20000010, 0x00400000, 0x20004000, |
| 0x20000000, 0x00004010, 0x20000010, 0x20404010, 0x00404000, 0x20400000, |
| 0x00404010, 0x20404000, 0x00000000, 0x20400010, 0x00000010, 0x00004000, |
| 0x20400000, 0x00404010, 0x00004000, 0x00400010, 0x20004010, 0x00000000, |
| 0x20404000, 0x20000000, 0x00400010, 0x20004010 |
| }; |
| |
| static const uint32_t sbox7[64] = { |
| 0x00200000, 0x04200002, 0x04000802, 0x00000000, 0x00000800, 0x04000802, |
| 0x00200802, 0x04200800, 0x04200802, 0x00200000, 0x00000000, 0x04000002, |
| 0x00000002, 0x04000000, 0x04200002, 0x00000802, 0x04000800, 0x00200802, |
| 0x00200002, 0x04000800, 0x04000002, 0x04200000, 0x04200800, 0x00200002, |
| 0x04200000, 0x00000800, 0x00000802, 0x04200802, 0x00200800, 0x00000002, |
| 0x04000000, 0x00200800, 0x04000000, 0x00200800, 0x00200000, 0x04000802, |
| 0x04000802, 0x04200002, 0x04200002, 0x00000002, 0x00200002, 0x04000000, |
| 0x04000800, 0x00200000, 0x04200800, 0x00000802, 0x00200802, 0x04200800, |
| 0x00000802, 0x04000002, 0x04200802, 0x04200000, 0x00200800, 0x00000000, |
| 0x00000002, 0x04200802, 0x00000000, 0x00200802, 0x04200000, 0x00000800, |
| 0x04000002, 0x04000800, 0x00000800, 0x00200002 |
| }; |
| |
| static const uint32_t sbox8[64] = { |
| 0x10001040, 0x00001000, 0x00040000, 0x10041040, 0x10000000, 0x10001040, |
| 0x00000040, 0x10000000, 0x00040040, 0x10040000, 0x10041040, 0x00041000, |
| 0x10041000, 0x00041040, 0x00001000, 0x00000040, 0x10040000, 0x10000040, |
| 0x10001000, 0x00001040, 0x00041000, 0x00040040, 0x10040040, 0x10041000, |
| 0x00001040, 0x00000000, 0x00000000, 0x10040040, 0x10000040, 0x10001000, |
| 0x00041040, 0x00040000, 0x00041040, 0x00040000, 0x10041000, 0x00001000, |
| 0x00000040, 0x10040040, 0x00001000, 0x00041040, 0x10001000, 0x00000040, |
| 0x10000040, 0x10040000, 0x10040040, 0x10000000, 0x00040000, 0x10001040, |
| 0x00000000, 0x10041040, 0x00040040, 0x10000040, 0x10040000, 0x10001000, |
| 0x10001040, 0x00000000, 0x10041040, 0x00041000, 0x00041000, 0x00001040, |
| 0x00001040, 0x00040040, 0x10000000, 0x10041000 |
| }; |
| |
| /* |
| * These two tables are part of the 'permuted choice 1' function. |
| * In this implementation several speed improvements are done. |
| */ |
| static const uint32_t leftkey_swap[16] = { |
| 0x00000000, 0x00000001, 0x00000100, 0x00000101, |
| 0x00010000, 0x00010001, 0x00010100, 0x00010101, |
| 0x01000000, 0x01000001, 0x01000100, 0x01000101, |
| 0x01010000, 0x01010001, 0x01010100, 0x01010101 |
| }; |
| |
| static const uint32_t rightkey_swap[16] = { |
| 0x00000000, 0x01000000, 0x00010000, 0x01010000, |
| 0x00000100, 0x01000100, 0x00010100, 0x01010100, |
| 0x00000001, 0x01000001, 0x00010001, 0x01010001, |
| 0x00000101, 0x01000101, 0x00010101, 0x01010101, |
| }; |
| |
| /* |
| * Numbers of left shifts per round for encryption subkeys. To |
| * calculate the decryption subkeys we just reverse the ordering of |
| * the calculated encryption subkeys, so there is no need for a |
| * decryption rotate tab. |
| */ |
| static const unsigned char encrypt_rotate_tab[16] = { |
| 1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1 |
| }; |
| |
| /* |
| * Table with weak DES keys sorted in ascending order. In DES there |
| * are 64 known keys which are weak. They are weak because they |
| * produce only one, two or four different subkeys in the subkey |
| * scheduling process. The keys in this table have all their parity |
| * bits cleared. |
| */ |
| static const unsigned char weak_keys[64][8] = { |
| {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, /*w */ |
| {0x00, 0x00, 0x1e, 0x1e, 0x00, 0x00, 0x0e, 0x0e}, |
| {0x00, 0x00, 0xe0, 0xe0, 0x00, 0x00, 0xf0, 0xf0}, |
| {0x00, 0x00, 0xfe, 0xfe, 0x00, 0x00, 0xfe, 0xfe}, |
| {0x00, 0x1e, 0x00, 0x1e, 0x00, 0x0e, 0x00, 0x0e}, /*sw */ |
| {0x00, 0x1e, 0x1e, 0x00, 0x00, 0x0e, 0x0e, 0x00}, |
| {0x00, 0x1e, 0xe0, 0xfe, 0x00, 0x0e, 0xf0, 0xfe}, |
| {0x00, 0x1e, 0xfe, 0xe0, 0x00, 0x0e, 0xfe, 0xf0}, |
| {0x00, 0xe0, 0x00, 0xe0, 0x00, 0xf0, 0x00, 0xf0}, /*sw */ |
| {0x00, 0xe0, 0x1e, 0xfe, 0x00, 0xf0, 0x0e, 0xfe}, |
| {0x00, 0xe0, 0xe0, 0x00, 0x00, 0xf0, 0xf0, 0x00}, |
| {0x00, 0xe0, 0xfe, 0x1e, 0x00, 0xf0, 0xfe, 0x0e}, |
| {0x00, 0xfe, 0x00, 0xfe, 0x00, 0xfe, 0x00, 0xfe}, /*sw */ |
| {0x00, 0xfe, 0x1e, 0xe0, 0x00, 0xfe, 0x0e, 0xf0}, |
| {0x00, 0xfe, 0xe0, 0x1e, 0x00, 0xfe, 0xf0, 0x0e}, |
| {0x00, 0xfe, 0xfe, 0x00, 0x00, 0xfe, 0xfe, 0x00}, |
| {0x1e, 0x00, 0x00, 0x1e, 0x0e, 0x00, 0x00, 0x0e}, |
| {0x1e, 0x00, 0x1e, 0x00, 0x0e, 0x00, 0x0e, 0x00}, /*sw */ |
| {0x1e, 0x00, 0xe0, 0xfe, 0x0e, 0x00, 0xf0, 0xfe}, |
| {0x1e, 0x00, 0xfe, 0xe0, 0x0e, 0x00, 0xfe, 0xf0}, |
| {0x1e, 0x1e, 0x00, 0x00, 0x0e, 0x0e, 0x00, 0x00}, |
| {0x1e, 0x1e, 0x1e, 0x1e, 0x0e, 0x0e, 0x0e, 0x0e}, /*w */ |
| {0x1e, 0x1e, 0xe0, 0xe0, 0x0e, 0x0e, 0xf0, 0xf0}, |
| {0x1e, 0x1e, 0xfe, 0xfe, 0x0e, 0x0e, 0xfe, 0xfe}, |
| {0x1e, 0xe0, 0x00, 0xfe, 0x0e, 0xf0, 0x00, 0xfe}, |
| {0x1e, 0xe0, 0x1e, 0xe0, 0x0e, 0xf0, 0x0e, 0xf0}, /*sw */ |
| {0x1e, 0xe0, 0xe0, 0x1e, 0x0e, 0xf0, 0xf0, 0x0e}, |
| {0x1e, 0xe0, 0xfe, 0x00, 0x0e, 0xf0, 0xfe, 0x00}, |
| {0x1e, 0xfe, 0x00, 0xe0, 0x0e, 0xfe, 0x00, 0xf0}, |
| {0x1e, 0xfe, 0x1e, 0xfe, 0x0e, 0xfe, 0x0e, 0xfe}, /*sw */ |
| {0x1e, 0xfe, 0xe0, 0x00, 0x0e, 0xfe, 0xf0, 0x00}, |
| {0x1e, 0xfe, 0xfe, 0x1e, 0x0e, 0xfe, 0xfe, 0x0e}, |
| {0xe0, 0x00, 0x00, 0xe0, 0xf0, 0x00, 0x00, 0xf0}, |
| {0xe0, 0x00, 0x1e, 0xfe, 0xf0, 0x00, 0x0e, 0xfe}, |
| {0xe0, 0x00, 0xe0, 0x00, 0xf0, 0x00, 0xf0, 0x00}, /*sw */ |
| {0xe0, 0x00, 0xfe, 0x1e, 0xf0, 0x00, 0xfe, 0x0e}, |
| {0xe0, 0x1e, 0x00, 0xfe, 0xf0, 0x0e, 0x00, 0xfe}, |
| {0xe0, 0x1e, 0x1e, 0xe0, 0xf0, 0x0e, 0x0e, 0xf0}, |
| {0xe0, 0x1e, 0xe0, 0x1e, 0xf0, 0x0e, 0xf0, 0x0e}, /*sw */ |
| {0xe0, 0x1e, 0xfe, 0x00, 0xf0, 0x0e, 0xfe, 0x00}, |
| {0xe0, 0xe0, 0x00, 0x00, 0xf0, 0xf0, 0x00, 0x00}, |
| {0xe0, 0xe0, 0x1e, 0x1e, 0xf0, 0xf0, 0x0e, 0x0e}, |
| {0xe0, 0xe0, 0xe0, 0xe0, 0xf0, 0xf0, 0xf0, 0xf0}, /*w */ |
| {0xe0, 0xe0, 0xfe, 0xfe, 0xf0, 0xf0, 0xfe, 0xfe}, |
| {0xe0, 0xfe, 0x00, 0x1e, 0xf0, 0xfe, 0x00, 0x0e}, |
| {0xe0, 0xfe, 0x1e, 0x00, 0xf0, 0xfe, 0x0e, 0x00}, |
| {0xe0, 0xfe, 0xe0, 0xfe, 0xf0, 0xfe, 0xf0, 0xfe}, /*sw */ |
| {0xe0, 0xfe, 0xfe, 0xe0, 0xf0, 0xfe, 0xfe, 0xf0}, |
| {0xfe, 0x00, 0x00, 0xfe, 0xfe, 0x00, 0x00, 0xfe}, |
| {0xfe, 0x00, 0x1e, 0xe0, 0xfe, 0x00, 0x0e, 0xf0}, |
| {0xfe, 0x00, 0xe0, 0x1e, 0xfe, 0x00, 0xf0, 0x0e}, |
| {0xfe, 0x00, 0xfe, 0x00, 0xfe, 0x00, 0xfe, 0x00}, /*sw */ |
| {0xfe, 0x1e, 0x00, 0xe0, 0xfe, 0x0e, 0x00, 0xf0}, |
| {0xfe, 0x1e, 0x1e, 0xfe, 0xfe, 0x0e, 0x0e, 0xfe}, |
| {0xfe, 0x1e, 0xe0, 0x00, 0xfe, 0x0e, 0xf0, 0x00}, |
| {0xfe, 0x1e, 0xfe, 0x1e, 0xfe, 0x0e, 0xfe, 0x0e}, /*sw */ |
| {0xfe, 0xe0, 0x00, 0x1e, 0xfe, 0xf0, 0x00, 0x0e}, |
| {0xfe, 0xe0, 0x1e, 0x00, 0xfe, 0xf0, 0x0e, 0x00}, |
| {0xfe, 0xe0, 0xe0, 0xfe, 0xfe, 0xf0, 0xf0, 0xfe}, |
| {0xfe, 0xe0, 0xfe, 0xe0, 0xfe, 0xf0, 0xfe, 0xf0}, /*sw */ |
| {0xfe, 0xfe, 0x00, 0x00, 0xfe, 0xfe, 0x00, 0x00}, |
| {0xfe, 0xfe, 0x1e, 0x1e, 0xfe, 0xfe, 0x0e, 0x0e}, |
| {0xfe, 0xfe, 0xe0, 0xe0, 0xfe, 0xfe, 0xf0, 0xf0}, |
| {0xfe, 0xfe, 0xfe, 0xfe, 0xfe, 0xfe, 0xfe, 0xfe} /*w */ |
| }; |
| |
| bool |
| gl_des_is_weak_key (const char * key) |
| { |
| char work[8]; |
| int i, left, right, middle, cmp_result; |
| |
| /* clear parity bits */ |
| for (i = 0; i < 8; ++i) |
| work[i] = ((unsigned char)key[i]) & 0xfe; |
| |
| /* binary search in the weak key table */ |
| left = 0; |
| right = 63; |
| while (left <= right) |
| { |
| middle = (left + right) / 2; |
| |
| if (!(cmp_result = memcmp (work, weak_keys[middle], 8))) |
| return -1; |
| |
| if (cmp_result > 0) |
| left = middle + 1; |
| else |
| right = middle - 1; |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * Macro to swap bits across two words. |
| */ |
| #define DO_PERMUTATION(a, temp, b, offset, mask) \ |
| temp = ((a>>offset) ^ b) & mask; \ |
| b ^= temp; \ |
| a ^= temp<<offset; |
| |
| |
| /* |
| * This performs the 'initial permutation' of the data to be encrypted |
| * or decrypted. Additionally the resulting two words are rotated one bit |
| * to the left. |
| */ |
| #define INITIAL_PERMUTATION(left, temp, right) \ |
| DO_PERMUTATION(left, temp, right, 4, 0x0f0f0f0f) \ |
| DO_PERMUTATION(left, temp, right, 16, 0x0000ffff) \ |
| DO_PERMUTATION(right, temp, left, 2, 0x33333333) \ |
| DO_PERMUTATION(right, temp, left, 8, 0x00ff00ff) \ |
| right = (right << 1) | (right >> 31); \ |
| temp = (left ^ right) & 0xaaaaaaaa; \ |
| right ^= temp; \ |
| left ^= temp; \ |
| left = (left << 1) | (left >> 31); |
| |
| /* |
| * The 'inverse initial permutation'. |
| */ |
| #define FINAL_PERMUTATION(left, temp, right) \ |
| left = (left << 31) | (left >> 1); \ |
| temp = (left ^ right) & 0xaaaaaaaa; \ |
| left ^= temp; \ |
| right ^= temp; \ |
| right = (right << 31) | (right >> 1); \ |
| DO_PERMUTATION(right, temp, left, 8, 0x00ff00ff) \ |
| DO_PERMUTATION(right, temp, left, 2, 0x33333333) \ |
| DO_PERMUTATION(left, temp, right, 16, 0x0000ffff) \ |
| DO_PERMUTATION(left, temp, right, 4, 0x0f0f0f0f) |
| |
| |
| /* |
| * A full DES round including 'expansion function', 'sbox substitution' |
| * and 'primitive function P' but without swapping the left and right word. |
| * Please note: The data in 'from' and 'to' is already rotated one bit to |
| * the left, done in the initial permutation. |
| */ |
| #define DES_ROUND(from, to, work, subkey) \ |
| work = from ^ *subkey++; \ |
| to ^= sbox8[ work & 0x3f ]; \ |
| to ^= sbox6[ (work>>8) & 0x3f ]; \ |
| to ^= sbox4[ (work>>16) & 0x3f ]; \ |
| to ^= sbox2[ (work>>24) & 0x3f ]; \ |
| work = ((from << 28) | (from >> 4)) ^ *subkey++; \ |
| to ^= sbox7[ work & 0x3f ]; \ |
| to ^= sbox5[ (work>>8) & 0x3f ]; \ |
| to ^= sbox3[ (work>>16) & 0x3f ]; \ |
| to ^= sbox1[ (work>>24) & 0x3f ]; |
| |
| /* |
| * Macros to convert 8 bytes from/to 32bit words. |
| */ |
| #define READ_64BIT_DATA(data, left, right) \ |
| left = ((uint32_t) data[0] << 24) \ |
| | ((uint32_t) data[1] << 16) \ |
| | ((uint32_t) data[2] << 8) \ |
| | (uint32_t) data[3]; \ |
| right = ((uint32_t) data[4] << 24) \ |
| | ((uint32_t) data[5] << 16) \ |
| | ((uint32_t) data[6] << 8) \ |
| | (uint32_t) data[7]; |
| |
| #define WRITE_64BIT_DATA(data, left, right) \ |
| data[0] = (left >> 24) &0xff; data[1] = (left >> 16) &0xff; \ |
| data[2] = (left >> 8) &0xff; data[3] = left &0xff; \ |
| data[4] = (right >> 24) &0xff; data[5] = (right >> 16) &0xff; \ |
| data[6] = (right >> 8) &0xff; data[7] = right &0xff; |
| |
| /* |
| * des_key_schedule(): Calculate 16 subkeys pairs (even/odd) for |
| * 16 encryption rounds. |
| * To calculate subkeys for decryption the caller |
| * have to reorder the generated subkeys. |
| * |
| * rawkey: 8 Bytes of key data |
| * subkey: Array of at least 32 uint32_ts. Will be filled |
| * with calculated subkeys. |
| * |
| */ |
| static void |
| des_key_schedule (const char * _rawkey, uint32_t * subkey) |
| { |
| const unsigned char *rawkey = (const unsigned char *) _rawkey; |
| uint32_t left, right, work; |
| int round; |
| |
| READ_64BIT_DATA (rawkey, left, right) |
| DO_PERMUTATION (right, work, left, 4, 0x0f0f0f0f) |
| DO_PERMUTATION (right, work, left, 0, 0x10101010) |
| left = ((leftkey_swap[(left >> 0) & 0xf] << 3) |
| | (leftkey_swap[(left >> 8) & 0xf] << 2) |
| | (leftkey_swap[(left >> 16) & 0xf] << 1) |
| | (leftkey_swap[(left >> 24) & 0xf]) |
| | (leftkey_swap[(left >> 5) & 0xf] << 7) |
| | (leftkey_swap[(left >> 13) & 0xf] << 6) |
| | (leftkey_swap[(left >> 21) & 0xf] << 5) |
| | (leftkey_swap[(left >> 29) & 0xf] << 4)); |
| |
| left &= 0x0fffffff; |
| |
| right = ((rightkey_swap[(right >> 1) & 0xf] << 3) |
| | (rightkey_swap[(right >> 9) & 0xf] << 2) |
| | (rightkey_swap[(right >> 17) & 0xf] << 1) |
| | (rightkey_swap[(right >> 25) & 0xf]) |
| | (rightkey_swap[(right >> 4) & 0xf] << 7) |
| | (rightkey_swap[(right >> 12) & 0xf] << 6) |
| | (rightkey_swap[(right >> 20) & 0xf] << 5) |
| | (rightkey_swap[(right >> 28) & 0xf] << 4)); |
| |
| right &= 0x0fffffff; |
| |
| for (round = 0; round < 16; ++round) |
| { |
| left = ((left << encrypt_rotate_tab[round]) |
| | (left >> (28 - encrypt_rotate_tab[round]))) & 0x0fffffff; |
| right = ((right << encrypt_rotate_tab[round]) |
| | (right >> (28 - encrypt_rotate_tab[round]))) & 0x0fffffff; |
| |
| *subkey++ = (((left << 4) & 0x24000000) |
| | ((left << 28) & 0x10000000) |
| | ((left << 14) & 0x08000000) |
| | ((left << 18) & 0x02080000) |
| | ((left << 6) & 0x01000000) |
| | ((left << 9) & 0x00200000) |
| | ((left >> 1) & 0x00100000) |
| | ((left << 10) & 0x00040000) |
| | ((left << 2) & 0x00020000) |
| | ((left >> 10) & 0x00010000) |
| | ((right >> 13) & 0x00002000) |
| | ((right >> 4) & 0x00001000) |
| | ((right << 6) & 0x00000800) |
| | ((right >> 1) & 0x00000400) |
| | ((right >> 14) & 0x00000200) |
| | (right & 0x00000100) |
| | ((right >> 5) & 0x00000020) |
| | ((right >> 10) & 0x00000010) |
| | ((right >> 3) & 0x00000008) |
| | ((right >> 18) & 0x00000004) |
| | ((right >> 26) & 0x00000002) |
| | ((right >> 24) & 0x00000001)); |
| |
| *subkey++ = (((left << 15) & 0x20000000) |
| | ((left << 17) & 0x10000000) |
| | ((left << 10) & 0x08000000) |
| | ((left << 22) & 0x04000000) |
| | ((left >> 2) & 0x02000000) |
| | ((left << 1) & 0x01000000) |
| | ((left << 16) & 0x00200000) |
| | ((left << 11) & 0x00100000) |
| | ((left << 3) & 0x00080000) |
| | ((left >> 6) & 0x00040000) |
| | ((left << 15) & 0x00020000) |
| | ((left >> 4) & 0x00010000) |
| | ((right >> 2) & 0x00002000) |
| | ((right << 8) & 0x00001000) |
| | ((right >> 14) & 0x00000808) |
| | ((right >> 9) & 0x00000400) |
| | ((right) & 0x00000200) |
| | ((right << 7) & 0x00000100) |
| | ((right >> 7) & 0x00000020) |
| | ((right >> 3) & 0x00000011) |
| | ((right << 2) & 0x00000004) |
| | ((right >> 21) & 0x00000002)); |
| } |
| } |
| |
| void |
| gl_des_setkey (gl_des_ctx *ctx, const char * key) |
| { |
| int i; |
| |
| des_key_schedule (key, ctx->encrypt_subkeys); |
| |
| for (i = 0; i < 32; i += 2) |
| { |
| ctx->decrypt_subkeys[i] = ctx->encrypt_subkeys[30 - i]; |
| ctx->decrypt_subkeys[i + 1] = ctx->encrypt_subkeys[31 - i]; |
| } |
| } |
| |
| bool |
| gl_des_makekey (gl_des_ctx *ctx, const char * key, size_t keylen) |
| { |
| if (keylen != 8) |
| return false; |
| |
| gl_des_setkey (ctx, key); |
| |
| return !gl_des_is_weak_key (key); |
| } |
| |
| void |
| gl_des_ecb_crypt (gl_des_ctx *ctx, const char * _from, char * _to, int mode) |
| { |
| const unsigned char *from = (const unsigned char *) _from; |
| unsigned char *to = (unsigned char *) _to; |
| uint32_t left, right, work; |
| uint32_t *keys; |
| |
| keys = mode ? ctx->decrypt_subkeys : ctx->encrypt_subkeys; |
| |
| READ_64BIT_DATA (from, left, right) |
| INITIAL_PERMUTATION (left, work, right) |
| DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys) |
| DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys) |
| DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys) |
| DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys) |
| DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys) |
| DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys) |
| DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys) |
| DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys) |
| FINAL_PERMUTATION (right, work, left) |
| WRITE_64BIT_DATA (to, right, left) |
| } |
| |
| void |
| gl_3des_set2keys (gl_3des_ctx *ctx, const char * key1, const char * key2) |
| { |
| int i; |
| |
| des_key_schedule (key1, ctx->encrypt_subkeys); |
| des_key_schedule (key2, &(ctx->decrypt_subkeys[32])); |
| |
| for (i = 0; i < 32; i += 2) |
| { |
| ctx->decrypt_subkeys[i] = ctx->encrypt_subkeys[30 - i]; |
| ctx->decrypt_subkeys[i + 1] = ctx->encrypt_subkeys[31 - i]; |
| |
| ctx->encrypt_subkeys[i + 32] = ctx->decrypt_subkeys[62 - i]; |
| ctx->encrypt_subkeys[i + 33] = ctx->decrypt_subkeys[63 - i]; |
| |
| ctx->encrypt_subkeys[i + 64] = ctx->encrypt_subkeys[i]; |
| ctx->encrypt_subkeys[i + 65] = ctx->encrypt_subkeys[i + 1]; |
| |
| ctx->decrypt_subkeys[i + 64] = ctx->decrypt_subkeys[i]; |
| ctx->decrypt_subkeys[i + 65] = ctx->decrypt_subkeys[i + 1]; |
| } |
| } |
| |
| void |
| gl_3des_set3keys (gl_3des_ctx *ctx, const char * key1, |
| const char * key2, const char * key3) |
| { |
| int i; |
| |
| des_key_schedule (key1, ctx->encrypt_subkeys); |
| des_key_schedule (key2, &(ctx->decrypt_subkeys[32])); |
| des_key_schedule (key3, &(ctx->encrypt_subkeys[64])); |
| |
| for (i = 0; i < 32; i += 2) |
| { |
| ctx->decrypt_subkeys[i] = ctx->encrypt_subkeys[94 - i]; |
| ctx->decrypt_subkeys[i + 1] = ctx->encrypt_subkeys[95 - i]; |
| |
| ctx->encrypt_subkeys[i + 32] = ctx->decrypt_subkeys[62 - i]; |
| ctx->encrypt_subkeys[i + 33] = ctx->decrypt_subkeys[63 - i]; |
| |
| ctx->decrypt_subkeys[i + 64] = ctx->encrypt_subkeys[30 - i]; |
| ctx->decrypt_subkeys[i + 65] = ctx->encrypt_subkeys[31 - i]; |
| } |
| } |
| |
| void |
| gl_3des_ecb_crypt (gl_3des_ctx *ctx, |
| const char * _from, |
| char * _to, int mode) |
| { |
| const unsigned char *from = (const unsigned char *) _from; |
| unsigned char *to = (unsigned char *) _to; |
| uint32_t left, right, work; |
| uint32_t *keys; |
| |
| keys = mode ? ctx->decrypt_subkeys : ctx->encrypt_subkeys; |
| |
| READ_64BIT_DATA (from, left, right) |
| INITIAL_PERMUTATION (left, work, right) |
| DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys) |
| DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys) |
| DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys) |
| DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys) |
| DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys) |
| DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys) |
| DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys) |
| DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys) |
| DES_ROUND (left, right, work, keys) DES_ROUND (right, left, work, keys) |
| DES_ROUND (left, right, work, keys) DES_ROUND (right, left, work, keys) |
| DES_ROUND (left, right, work, keys) DES_ROUND (right, left, work, keys) |
| DES_ROUND (left, right, work, keys) DES_ROUND (right, left, work, keys) |
| DES_ROUND (left, right, work, keys) DES_ROUND (right, left, work, keys) |
| DES_ROUND (left, right, work, keys) DES_ROUND (right, left, work, keys) |
| DES_ROUND (left, right, work, keys) DES_ROUND (right, left, work, keys) |
| DES_ROUND (left, right, work, keys) DES_ROUND (right, left, work, keys) |
| DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys) |
| DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys) |
| DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys) |
| DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys) |
| DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys) |
| DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys) |
| DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys) |
| DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys) |
| FINAL_PERMUTATION (right, work, left) |
| WRITE_64BIT_DATA (to, right, left) |
| } |
| |
| bool |
| gl_3des_makekey (gl_3des_ctx *ctx, const char * key, size_t keylen) |
| { |
| if (keylen != 24) |
| return false; |
| |
| gl_3des_set3keys (ctx, key, key + 8, key + 16); |
| |
| return !(gl_des_is_weak_key (key) |
| || gl_des_is_weak_key (key + 8) |
| || gl_des_is_weak_key (key + 16)); |
| } |
