/* This file was automatically imported with import_gcry.py. Please don't modify it */ #include GRUB_MOD_LICENSE ("GPLv3+"); /* des.c - DES and Triple-DES encryption/decryption Algorithm * Copyright (C) 1998, 1999, 2001, 2002, 2003, * 2008 Free Software Foundation, Inc. * * This file is part of Libgcrypt. * * Libgcrypt 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. * * Libgcrypt 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, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA * * 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. * * (In the examples below the slashes at the beginning and ending of comments * are omited.) * * DES Example * ----------- * unsigned char key[8]; * unsigned char plaintext[8]; * unsigned char ciphertext[8]; * unsigned char recoverd[8]; * des_ctx context; * * * Fill 'key' and 'plaintext' with some data * * .... * * * Set up the DES encryption context * * des_setkey(context, key); * * * Encrypt the plaintext * * des_ecb_encrypt(context, plaintext, ciphertext); * * * To recover the orginal 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]; * tripledes_ctx context; * * * If you would like to use two 64bit keys, fill 'key1' and'key2' * then setup the encryption context: * * tripledes_set2keys(context, key1, key2); * * * To use three 64bit keys with Triple-DES use: * * tripledes_set3keys(context, key1, key2, key3); * * * Encrypting plaintext with Triple-DES * * tripledes_ecb_encrypt(context, plaintext, ciphertext); * * * Decrypting ciphertext to recover the plaintext with Triple-DES * * tripledes_ecb_decrypt(context, ciphertext, recoverd); * * * Selftest * -------- * char *error_msg; * * * To perform a selftest of this DES/Triple-DES implementation use the * function selftest(). It will return an error string if there are * some problems with this library. * * * if ( (error_msg = selftest()) ) * { * fprintf(stderr, "An error in the DES/Triple-DES implementation occurred: %s\n", error_msg); * abort(); * } */ #include "types.h" /* for byte and u32 typedefs */ #include "g10lib.h" #include "cipher.h" #if defined(__GNUC__) && defined(__GNU_LIBRARY__) #define working_memcmp memcmp #else /* * According to the SunOS man page, memcmp returns indeterminate sign * depending on whether characters are signed or not. */ static int working_memcmp( const char *a, const char *b, size_t n ) { for( ; n; n--, a++, b++ ) if( *a != *b ) return (int)(*(byte*)a) - (int)(*(byte*)b); return 0; } #endif /* * Encryption/Decryption context of DES */ typedef struct _des_ctx { u32 encrypt_subkeys[32]; u32 decrypt_subkeys[32]; } des_ctx[1]; /* * Encryption/Decryption context of Triple-DES */ typedef struct _tripledes_ctx { u32 encrypt_subkeys[96]; u32 decrypt_subkeys[96]; struct { int no_weak_key; } flags; } tripledes_ctx[1]; static void des_key_schedule (const byte *, u32 *); static int des_setkey (struct _des_ctx *, const byte *); static int des_ecb_crypt (struct _des_ctx *, const byte *, byte *, int); static int tripledes_ecb_crypt (struct _tripledes_ctx *, const byte *, byte *, int); static int is_weak_key ( const byte *key ); static int initialized; /* * The s-box values are permuted according to the 'primitive function P' * and are rotated one bit to the left. */ static u32 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 u32 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 u32 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 u32 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 u32 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 u32 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 u32 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 u32 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 u32 leftkey_swap[16] = { 0x00000000, 0x00000001, 0x00000100, 0x00000101, 0x00010000, 0x00010001, 0x00010100, 0x00010101, 0x01000000, 0x01000001, 0x01000100, 0x01000101, 0x01010000, 0x01010001, 0x01010100, 0x01010101 }; static u32 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 their * is no need for a decryption rotate tab. */ static byte 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 their 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 byte 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*/ }; /* * 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 = (data[0] << 24) | (data[1] << 16) | (data[2] << 8) | data[3]; \ right = (data[4] << 24) | (data[5] << 16) | (data[6] << 8) | 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; /* * Handy macros for encryption and decryption of data */ #define des_ecb_encrypt(ctx, from, to) des_ecb_crypt(ctx, from, to, 0) #define des_ecb_decrypt(ctx, from, to) des_ecb_crypt(ctx, from, to, 1) #define tripledes_ecb_encrypt(ctx, from, to) tripledes_ecb_crypt(ctx,from,to,0) #define tripledes_ecb_decrypt(ctx, from, to) tripledes_ecb_crypt(ctx,from,to,1) /* * 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 u32s. Will be filled * with calculated subkeys. * */ static void des_key_schedule (const byte * rawkey, u32 * subkey) { u32 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)); } } /* * Fill a DES context with subkeys calculated from a 64bit key. * Does not check parity bits, but simply ignore them. * Does not check for weak keys. */ static int des_setkey (struct _des_ctx *ctx, const byte * key) { static const char *selftest_failed; int i; if (!fips_mode () && !initialized) { initialized = 1; selftest_failed = selftest (); if (selftest_failed) log_error ("%s\n", selftest_failed); } if (selftest_failed) return GPG_ERR_SELFTEST_FAILED; des_key_schedule (key, ctx->encrypt_subkeys); _gcry_burn_stack (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]; } return 0; } /* * Electronic Codebook Mode DES encryption/decryption of data according * to 'mode'. */ static int des_ecb_crypt (struct _des_ctx *ctx, const byte * from, byte * to, int mode) { u32 left, right, work; u32 *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) return 0; } /* * Fill a Triple-DES context with subkeys calculated from two 64bit keys. * Does not check the parity bits of the keys, but simply ignore them. * Does not check for weak keys. */ /* * Fill a Triple-DES context with subkeys calculated from three 64bit keys. * Does not check the parity bits of the keys, but simply ignore them. * Does not check for weak keys. */ static int tripledes_set3keys (struct _tripledes_ctx *ctx, const byte * key1, const byte * key2, const byte * key3) { static const char *selftest_failed; int i; if (!fips_mode () && !initialized) { initialized = 1; selftest_failed = selftest (); if (selftest_failed) log_error ("%s\n", selftest_failed); } if (selftest_failed) return GPG_ERR_SELFTEST_FAILED; des_key_schedule (key1, ctx->encrypt_subkeys); des_key_schedule (key2, &(ctx->decrypt_subkeys[32])); des_key_schedule (key3, &(ctx->encrypt_subkeys[64])); _gcry_burn_stack (32); 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]; } return 0; } /* * Electronic Codebook Mode Triple-DES encryption/decryption of data * according to 'mode'. Sometimes this mode is named 'EDE' mode * (Encryption-Decryption-Encryption). */ static int tripledes_ecb_crypt (struct _tripledes_ctx *ctx, const byte * from, byte * to, int mode) { u32 left, right, work; u32 *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) return 0; } /* * Check whether the 8 byte key is weak. * Does not check the parity bits of the key but simple ignore them. */ static int is_weak_key ( const byte *key ) { byte work[8]; int i, left, right, middle, cmp_result; /* clear parity bits */ for(i=0; i<8; ++i) work[i] = key[i] & 0xfe; /* binary search in the weak key table */ left = 0; right = 63; while(left <= right) { middle = (left + right) / 2; if ( !(cmp_result=working_memcmp(work, weak_keys[middle], 8)) ) return -1; if ( cmp_result > 0 ) left = middle + 1; else right = middle - 1; } return 0; } /* * Performs a selftest of this DES/Triple-DES implementation. * Returns an string with the error text on failure. * Returns NULL if all is ok. */ static gcry_err_code_t do_tripledes_setkey ( void *context, const byte *key, unsigned keylen ) { struct _tripledes_ctx *ctx = (struct _tripledes_ctx *) context; if( keylen != 24 ) return GPG_ERR_INV_KEYLEN; tripledes_set3keys ( ctx, key, key+8, key+16); if (ctx->flags.no_weak_key) ; /* Detection has been disabled. */ else if (is_weak_key (key) || is_weak_key (key+8) || is_weak_key (key+16)) { _gcry_burn_stack (64); return GPG_ERR_WEAK_KEY; } _gcry_burn_stack (64); return GPG_ERR_NO_ERROR; } static void do_tripledes_encrypt( void *context, byte *outbuf, const byte *inbuf ) { struct _tripledes_ctx *ctx = (struct _tripledes_ctx *) context; tripledes_ecb_encrypt ( ctx, inbuf, outbuf ); _gcry_burn_stack (32); } static void do_tripledes_decrypt( void *context, byte *outbuf, const byte *inbuf ) { struct _tripledes_ctx *ctx = (struct _tripledes_ctx *) context; tripledes_ecb_decrypt ( ctx, inbuf, outbuf ); _gcry_burn_stack (32); } static gcry_err_code_t do_des_setkey (void *context, const byte *key, unsigned keylen) { struct _des_ctx *ctx = (struct _des_ctx *) context; if (keylen != 8) return GPG_ERR_INV_KEYLEN; des_setkey (ctx, key); if (is_weak_key (key)) { _gcry_burn_stack (64); return GPG_ERR_WEAK_KEY; } _gcry_burn_stack (64); return GPG_ERR_NO_ERROR; } static void do_des_encrypt( void *context, byte *outbuf, const byte *inbuf ) { struct _des_ctx *ctx = (struct _des_ctx *) context; des_ecb_encrypt ( ctx, inbuf, outbuf ); _gcry_burn_stack (32); } static void do_des_decrypt( void *context, byte *outbuf, const byte *inbuf ) { struct _des_ctx *ctx = (struct _des_ctx *) context; des_ecb_decrypt ( ctx, inbuf, outbuf ); _gcry_burn_stack (32); } /* Self-test section. */ /* Selftest for TripleDES. */ /* Run a full self-test for ALGO and return 0 on success. */ gcry_cipher_spec_t _gcry_cipher_spec_des = { "DES", NULL, NULL, 8, 64, sizeof (struct _des_ctx), do_des_setkey, do_des_encrypt, do_des_decrypt , #ifdef GRUB_UTIL .modname = "gcry_des", #endif }; static gcry_cipher_oid_spec_t oids_tripledes[] = { { "1.2.840.113549.3.7", GCRY_CIPHER_MODE_CBC }, /* Teletrust specific OID for 3DES. */ { "1.3.36.3.1.3.2.1", GCRY_CIPHER_MODE_CBC }, /* pbeWithSHAAnd3_KeyTripleDES_CBC */ { "1.2.840.113549.1.12.1.3", GCRY_CIPHER_MODE_CBC }, { NULL } }; gcry_cipher_spec_t _gcry_cipher_spec_tripledes = { "3DES", NULL, oids_tripledes, 8, 192, sizeof (struct _tripledes_ctx), do_tripledes_setkey, do_tripledes_encrypt, do_tripledes_decrypt , #ifdef GRUB_UTIL .modname = "gcry_des", #endif }; GRUB_MOD_INIT(gcry_des) { grub_cipher_register (&_gcry_cipher_spec_des); grub_cipher_register (&_gcry_cipher_spec_tripledes); } GRUB_MOD_FINI(gcry_des) { grub_cipher_unregister (&_gcry_cipher_spec_des); grub_cipher_unregister (&_gcry_cipher_spec_tripledes); }