| /* des.c --- DES and Triple-DES encryption/decryption Algorithm | |
| * Copyright (C) 1998-1999, 2001-2007, 2009-2026 Free Software Foundation, Inc. | |
| * | |
| * This file 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 2.1 of the | |
| * License, 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 Lesser 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/>. | |
| * | |
| */ | |
| /* 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 recovered[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, recovered); | |
| * | |
| * | |
| * 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 recovered[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, recovered); | |
| */ | |
| #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]; | |
| /* clear parity bits */ | |
| for (int i = 0; i < 8; ++i) | |
| work[i] = ((unsigned char)key[i]) & 0xfe; | |
| /* binary search in the weak key table */ | |
| int left = 0; | |
| int right = 63; | |
| while (left <= right) | |
| { | |
| int middle = (left + right) / 2; | |
| int cmp_result = memcmp (work, weak_keys[middle], 8); | |
| if (!cmp_result) | |
| 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; | |
| 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 (int 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 *restrict ctx, char const *restrict key) | |
| { | |
| des_key_schedule (key, ctx->encrypt_subkeys); | |
| for (int 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, char const *restrict 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, char const *restrict _from, | |
| char *restrict _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 *restrict ctx, | |
| char const *restrict key1, | |
| char const *restrict key2) | |
| { | |
| des_key_schedule (key1, ctx->encrypt_subkeys); | |
| des_key_schedule (key2, &(ctx->decrypt_subkeys[32])); | |
| for (int 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 *restrict ctx, | |
| char const *restrict key1, | |
| char const *restrict key2, | |
| char const *restrict key3) | |
| { | |
| des_key_schedule (key1, ctx->encrypt_subkeys); | |
| des_key_schedule (key2, &(ctx->decrypt_subkeys[32])); | |
| des_key_schedule (key3, &(ctx->encrypt_subkeys[64])); | |
| for (int 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 *restrict ctx, | |
| char const *restrict _from, | |
| char *restrict _to, int mode) | |
| { | |
| const unsigned char *from = (const unsigned char *) _from; | |
| unsigned char *to = (unsigned char *) _to; | |
| uint32_t *keys = mode ? ctx->decrypt_subkeys : ctx->encrypt_subkeys; | |
| uint32_t left, right, work; | |
| 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 *restrict ctx, | |
| char const *restrict 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)); | |
| } |