/* des.c --- DES and Triple-DES encryption/decryption Algorithm
* Copyright (C) 1998-1999, 2001-2007, 2009-2023 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 .
*
*/
/* 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 , 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
#include "des.h"
#include
#include /* 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<> 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));
}