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Silly error in loading Default Settings - reset port but not protocol
[u/mdw/putty] / sshdes.c
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374330e2 1#include <assert.h>
2#include "ssh.h"
3
4/*
5
6DES implementation; 1995 Tatu Ylonen <ylo@cs.hut.fi>
7
8This implementation is derived from libdes-3.06, which is copyright
9(c) 1993 Eric Young, and distributed under the GNU GPL or the ARTISTIC licence
10(at the user's option). The original distribution can be found e.g. from
11ftp://ftp.dsi.unimi.it/pub/security/crypt/libdes/libdes-3.06.tar.gz.
12
13This implementation is distributed under the same terms. See
14libdes-README, libdes-ARTISTIC, and libdes-COPYING for more
15information.
16
17*/
18
374330e2 19typedef struct
20{
21 word32 key_schedule[32];
22} DESContext;
23
24/* Sets the des key for the context. Initializes the context. The least
25 significant bit of each byte of the key is ignored as parity. */
26static void des_set_key(unsigned char *key, DESContext *ks);
27
28/* Encrypts 32 bits in l,r, and stores the result in output[0] and output[1].
29 Performs encryption if encrypt is non-zero, and decryption if it is zero.
30 The key context must have been initialized previously with des_set_key. */
31static void des_encrypt(word32 l, word32 r, word32 *output, DESContext *ks,
32 int encrypt);
33
34/* Encrypts len bytes from src to dest in CBC modes. Len must be a multiple
35 of 8. iv will be modified at end to a value suitable for continuing
36 encryption. */
37static void des_cbc_encrypt(DESContext *ks, unsigned char *iv, unsigned char *dest,
38 const unsigned char *src, unsigned int len);
39
40/* Decrypts len bytes from src to dest in CBC modes. Len must be a multiple
41 of 8. iv will be modified at end to a value suitable for continuing
42 decryption. */
43static void des_cbc_decrypt(DESContext *ks, unsigned char *iv, unsigned char *dest,
44 const unsigned char *src, unsigned int len);
45
46/* Encrypts in CBC mode using triple-DES. */
47static void des_3cbc_encrypt(DESContext *ks1, unsigned char *iv1,
48 DESContext *ks2, unsigned char *iv2,
49 DESContext *ks3, unsigned char *iv3,
50 unsigned char *dest, const unsigned char *src,
51 unsigned int len);
52
53/* Decrypts in CBC mode using triple-DES. */
54static void des_3cbc_decrypt(DESContext *ks1, unsigned char *iv1,
55 DESContext *ks2, unsigned char *iv2,
56 DESContext *ks3, unsigned char *iv3,
57 unsigned char *dest, const unsigned char *src,
58 unsigned int len);
59
60#define GET_32BIT_LSB_FIRST(cp) \
61 (((unsigned long)(unsigned char)(cp)[0]) | \
62 ((unsigned long)(unsigned char)(cp)[1] << 8) | \
63 ((unsigned long)(unsigned char)(cp)[2] << 16) | \
64 ((unsigned long)(unsigned char)(cp)[3] << 24))
65
66#define PUT_32BIT_LSB_FIRST(cp, value) do { \
67 (cp)[0] = (value); \
68 (cp)[1] = (value) >> 8; \
69 (cp)[2] = (value) >> 16; \
70 (cp)[3] = (value) >> 24; } while (0)
71
72/*
73
74DES implementation; 1995 Tatu Ylonen <ylo@cs.hut.fi>
75
76This implementation is derived from libdes-3.06, which is copyright
77(c) 1993 Eric Young, and distributed under the GNU GPL or the ARTISTIC licence
78(at the user's option). The original distribution can be found e.g. from
79ftp://ftp.dsi.unimi.it/pub/security/crypt/libdes/libdes-3.06.tar.gz.
80
81This implementation is distributed under the same terms. See
82libdes-README, libdes-ARTISTIC, and libdes-COPYING for more
83information.
84
85A description of the DES algorithm can be found in every modern book on
86cryptography and data security, including the following:
87
88 Bruce Schneier: Applied Cryptography. John Wiley & Sons, 1994.
89
90 Jennifer Seberry and Josed Pieprzyk: Cryptography: An Introduction to
91 Computer Security. Prentice-Hall, 1989.
92
93 Man Young Rhee: Cryptography and Secure Data Communications. McGraw-Hill,
94 1994.
95
96*/
97
374330e2 98/* Table for key generation. This used to be in sk.h. */
99/* Copyright (C) 1993 Eric Young - see README for more details */
100static const word32 des_skb[8][64]={
101/* for C bits (numbered as per FIPS 46) 1 2 3 4 5 6 */
102{ 0x00000000,0x00000010,0x20000000,0x20000010,
1030x00010000,0x00010010,0x20010000,0x20010010,
1040x00000800,0x00000810,0x20000800,0x20000810,
1050x00010800,0x00010810,0x20010800,0x20010810,
1060x00000020,0x00000030,0x20000020,0x20000030,
1070x00010020,0x00010030,0x20010020,0x20010030,
1080x00000820,0x00000830,0x20000820,0x20000830,
1090x00010820,0x00010830,0x20010820,0x20010830,
1100x00080000,0x00080010,0x20080000,0x20080010,
1110x00090000,0x00090010,0x20090000,0x20090010,
1120x00080800,0x00080810,0x20080800,0x20080810,
1130x00090800,0x00090810,0x20090800,0x20090810,
1140x00080020,0x00080030,0x20080020,0x20080030,
1150x00090020,0x00090030,0x20090020,0x20090030,
1160x00080820,0x00080830,0x20080820,0x20080830,
1170x00090820,0x00090830,0x20090820,0x20090830 },
118/* for C bits (numbered as per FIPS 46) 7 8 10 11 12 13 */
119{ 0x00000000,0x02000000,0x00002000,0x02002000,
1200x00200000,0x02200000,0x00202000,0x02202000,
1210x00000004,0x02000004,0x00002004,0x02002004,
1220x00200004,0x02200004,0x00202004,0x02202004,
1230x00000400,0x02000400,0x00002400,0x02002400,
1240x00200400,0x02200400,0x00202400,0x02202400,
1250x00000404,0x02000404,0x00002404,0x02002404,
1260x00200404,0x02200404,0x00202404,0x02202404,
1270x10000000,0x12000000,0x10002000,0x12002000,
1280x10200000,0x12200000,0x10202000,0x12202000,
1290x10000004,0x12000004,0x10002004,0x12002004,
1300x10200004,0x12200004,0x10202004,0x12202004,
1310x10000400,0x12000400,0x10002400,0x12002400,
1320x10200400,0x12200400,0x10202400,0x12202400,
1330x10000404,0x12000404,0x10002404,0x12002404,
1340x10200404,0x12200404,0x10202404,0x12202404 },
135/* for C bits (numbered as per FIPS 46) 14 15 16 17 19 20 */
136{ 0x00000000,0x00000001,0x00040000,0x00040001,
1370x01000000,0x01000001,0x01040000,0x01040001,
1380x00000002,0x00000003,0x00040002,0x00040003,
1390x01000002,0x01000003,0x01040002,0x01040003,
1400x00000200,0x00000201,0x00040200,0x00040201,
1410x01000200,0x01000201,0x01040200,0x01040201,
1420x00000202,0x00000203,0x00040202,0x00040203,
1430x01000202,0x01000203,0x01040202,0x01040203,
1440x08000000,0x08000001,0x08040000,0x08040001,
1450x09000000,0x09000001,0x09040000,0x09040001,
1460x08000002,0x08000003,0x08040002,0x08040003,
1470x09000002,0x09000003,0x09040002,0x09040003,
1480x08000200,0x08000201,0x08040200,0x08040201,
1490x09000200,0x09000201,0x09040200,0x09040201,
1500x08000202,0x08000203,0x08040202,0x08040203,
1510x09000202,0x09000203,0x09040202,0x09040203 },
152/* for C bits (numbered as per FIPS 46) 21 23 24 26 27 28 */
153{ 0x00000000,0x00100000,0x00000100,0x00100100,
1540x00000008,0x00100008,0x00000108,0x00100108,
1550x00001000,0x00101000,0x00001100,0x00101100,
1560x00001008,0x00101008,0x00001108,0x00101108,
1570x04000000,0x04100000,0x04000100,0x04100100,
1580x04000008,0x04100008,0x04000108,0x04100108,
1590x04001000,0x04101000,0x04001100,0x04101100,
1600x04001008,0x04101008,0x04001108,0x04101108,
1610x00020000,0x00120000,0x00020100,0x00120100,
1620x00020008,0x00120008,0x00020108,0x00120108,
1630x00021000,0x00121000,0x00021100,0x00121100,
1640x00021008,0x00121008,0x00021108,0x00121108,
1650x04020000,0x04120000,0x04020100,0x04120100,
1660x04020008,0x04120008,0x04020108,0x04120108,
1670x04021000,0x04121000,0x04021100,0x04121100,
1680x04021008,0x04121008,0x04021108,0x04121108 },
169/* for D bits (numbered as per FIPS 46) 1 2 3 4 5 6 */
170{ 0x00000000,0x10000000,0x00010000,0x10010000,
1710x00000004,0x10000004,0x00010004,0x10010004,
1720x20000000,0x30000000,0x20010000,0x30010000,
1730x20000004,0x30000004,0x20010004,0x30010004,
1740x00100000,0x10100000,0x00110000,0x10110000,
1750x00100004,0x10100004,0x00110004,0x10110004,
1760x20100000,0x30100000,0x20110000,0x30110000,
1770x20100004,0x30100004,0x20110004,0x30110004,
1780x00001000,0x10001000,0x00011000,0x10011000,
1790x00001004,0x10001004,0x00011004,0x10011004,
1800x20001000,0x30001000,0x20011000,0x30011000,
1810x20001004,0x30001004,0x20011004,0x30011004,
1820x00101000,0x10101000,0x00111000,0x10111000,
1830x00101004,0x10101004,0x00111004,0x10111004,
1840x20101000,0x30101000,0x20111000,0x30111000,
1850x20101004,0x30101004,0x20111004,0x30111004 },
186/* for D bits (numbered as per FIPS 46) 8 9 11 12 13 14 */
187{ 0x00000000,0x08000000,0x00000008,0x08000008,
1880x00000400,0x08000400,0x00000408,0x08000408,
1890x00020000,0x08020000,0x00020008,0x08020008,
1900x00020400,0x08020400,0x00020408,0x08020408,
1910x00000001,0x08000001,0x00000009,0x08000009,
1920x00000401,0x08000401,0x00000409,0x08000409,
1930x00020001,0x08020001,0x00020009,0x08020009,
1940x00020401,0x08020401,0x00020409,0x08020409,
1950x02000000,0x0A000000,0x02000008,0x0A000008,
1960x02000400,0x0A000400,0x02000408,0x0A000408,
1970x02020000,0x0A020000,0x02020008,0x0A020008,
1980x02020400,0x0A020400,0x02020408,0x0A020408,
1990x02000001,0x0A000001,0x02000009,0x0A000009,
2000x02000401,0x0A000401,0x02000409,0x0A000409,
2010x02020001,0x0A020001,0x02020009,0x0A020009,
2020x02020401,0x0A020401,0x02020409,0x0A020409 },
203/* for D bits (numbered as per FIPS 46) 16 17 18 19 20 21 */
204{ 0x00000000,0x00000100,0x00080000,0x00080100,
2050x01000000,0x01000100,0x01080000,0x01080100,
2060x00000010,0x00000110,0x00080010,0x00080110,
2070x01000010,0x01000110,0x01080010,0x01080110,
2080x00200000,0x00200100,0x00280000,0x00280100,
2090x01200000,0x01200100,0x01280000,0x01280100,
2100x00200010,0x00200110,0x00280010,0x00280110,
2110x01200010,0x01200110,0x01280010,0x01280110,
2120x00000200,0x00000300,0x00080200,0x00080300,
2130x01000200,0x01000300,0x01080200,0x01080300,
2140x00000210,0x00000310,0x00080210,0x00080310,
2150x01000210,0x01000310,0x01080210,0x01080310,
2160x00200200,0x00200300,0x00280200,0x00280300,
2170x01200200,0x01200300,0x01280200,0x01280300,
2180x00200210,0x00200310,0x00280210,0x00280310,
2190x01200210,0x01200310,0x01280210,0x01280310 },
220/* for D bits (numbered as per FIPS 46) 22 23 24 25 27 28 */
221{ 0x00000000,0x04000000,0x00040000,0x04040000,
2220x00000002,0x04000002,0x00040002,0x04040002,
2230x00002000,0x04002000,0x00042000,0x04042000,
2240x00002002,0x04002002,0x00042002,0x04042002,
2250x00000020,0x04000020,0x00040020,0x04040020,
2260x00000022,0x04000022,0x00040022,0x04040022,
2270x00002020,0x04002020,0x00042020,0x04042020,
2280x00002022,0x04002022,0x00042022,0x04042022,
2290x00000800,0x04000800,0x00040800,0x04040800,
2300x00000802,0x04000802,0x00040802,0x04040802,
2310x00002800,0x04002800,0x00042800,0x04042800,
2320x00002802,0x04002802,0x00042802,0x04042802,
2330x00000820,0x04000820,0x00040820,0x04040820,
2340x00000822,0x04000822,0x00040822,0x04040822,
2350x00002820,0x04002820,0x00042820,0x04042820,
2360x00002822,0x04002822,0x00042822,0x04042822 }
237};
238
239/* Tables used for executing des. This used to be in spr.h. */
240/* Copyright (C) 1993 Eric Young - see README for more details */
241static const word32 des_SPtrans[8][64]={
242/* nibble 0 */
243{ 0x00820200, 0x00020000, 0x80800000, 0x80820200,
2440x00800000, 0x80020200, 0x80020000, 0x80800000,
2450x80020200, 0x00820200, 0x00820000, 0x80000200,
2460x80800200, 0x00800000, 0x00000000, 0x80020000,
2470x00020000, 0x80000000, 0x00800200, 0x00020200,
2480x80820200, 0x00820000, 0x80000200, 0x00800200,
2490x80000000, 0x00000200, 0x00020200, 0x80820000,
2500x00000200, 0x80800200, 0x80820000, 0x00000000,
2510x00000000, 0x80820200, 0x00800200, 0x80020000,
2520x00820200, 0x00020000, 0x80000200, 0x00800200,
2530x80820000, 0x00000200, 0x00020200, 0x80800000,
2540x80020200, 0x80000000, 0x80800000, 0x00820000,
2550x80820200, 0x00020200, 0x00820000, 0x80800200,
2560x00800000, 0x80000200, 0x80020000, 0x00000000,
2570x00020000, 0x00800000, 0x80800200, 0x00820200,
2580x80000000, 0x80820000, 0x00000200, 0x80020200 },
259
260/* nibble 1 */
261{ 0x10042004, 0x00000000, 0x00042000, 0x10040000,
2620x10000004, 0x00002004, 0x10002000, 0x00042000,
2630x00002000, 0x10040004, 0x00000004, 0x10002000,
2640x00040004, 0x10042000, 0x10040000, 0x00000004,
2650x00040000, 0x10002004, 0x10040004, 0x00002000,
2660x00042004, 0x10000000, 0x00000000, 0x00040004,
2670x10002004, 0x00042004, 0x10042000, 0x10000004,
2680x10000000, 0x00040000, 0x00002004, 0x10042004,
2690x00040004, 0x10042000, 0x10002000, 0x00042004,
2700x10042004, 0x00040004, 0x10000004, 0x00000000,
2710x10000000, 0x00002004, 0x00040000, 0x10040004,
2720x00002000, 0x10000000, 0x00042004, 0x10002004,
2730x10042000, 0x00002000, 0x00000000, 0x10000004,
2740x00000004, 0x10042004, 0x00042000, 0x10040000,
2750x10040004, 0x00040000, 0x00002004, 0x10002000,
2760x10002004, 0x00000004, 0x10040000, 0x00042000 },
277
278/* nibble 2 */
279{ 0x41000000, 0x01010040, 0x00000040, 0x41000040,
2800x40010000, 0x01000000, 0x41000040, 0x00010040,
2810x01000040, 0x00010000, 0x01010000, 0x40000000,
2820x41010040, 0x40000040, 0x40000000, 0x41010000,
2830x00000000, 0x40010000, 0x01010040, 0x00000040,
2840x40000040, 0x41010040, 0x00010000, 0x41000000,
2850x41010000, 0x01000040, 0x40010040, 0x01010000,
2860x00010040, 0x00000000, 0x01000000, 0x40010040,
2870x01010040, 0x00000040, 0x40000000, 0x00010000,
2880x40000040, 0x40010000, 0x01010000, 0x41000040,
2890x00000000, 0x01010040, 0x00010040, 0x41010000,
2900x40010000, 0x01000000, 0x41010040, 0x40000000,
2910x40010040, 0x41000000, 0x01000000, 0x41010040,
2920x00010000, 0x01000040, 0x41000040, 0x00010040,
2930x01000040, 0x00000000, 0x41010000, 0x40000040,
2940x41000000, 0x40010040, 0x00000040, 0x01010000 },
295
296/* nibble 3 */
297{ 0x00100402, 0x04000400, 0x00000002, 0x04100402,
2980x00000000, 0x04100000, 0x04000402, 0x00100002,
2990x04100400, 0x04000002, 0x04000000, 0x00000402,
3000x04000002, 0x00100402, 0x00100000, 0x04000000,
3010x04100002, 0x00100400, 0x00000400, 0x00000002,
3020x00100400, 0x04000402, 0x04100000, 0x00000400,
3030x00000402, 0x00000000, 0x00100002, 0x04100400,
3040x04000400, 0x04100002, 0x04100402, 0x00100000,
3050x04100002, 0x00000402, 0x00100000, 0x04000002,
3060x00100400, 0x04000400, 0x00000002, 0x04100000,
3070x04000402, 0x00000000, 0x00000400, 0x00100002,
3080x00000000, 0x04100002, 0x04100400, 0x00000400,
3090x04000000, 0x04100402, 0x00100402, 0x00100000,
3100x04100402, 0x00000002, 0x04000400, 0x00100402,
3110x00100002, 0x00100400, 0x04100000, 0x04000402,
3120x00000402, 0x04000000, 0x04000002, 0x04100400 },
313
314/* nibble 4 */
315{ 0x02000000, 0x00004000, 0x00000100, 0x02004108,
3160x02004008, 0x02000100, 0x00004108, 0x02004000,
3170x00004000, 0x00000008, 0x02000008, 0x00004100,
3180x02000108, 0x02004008, 0x02004100, 0x00000000,
3190x00004100, 0x02000000, 0x00004008, 0x00000108,
3200x02000100, 0x00004108, 0x00000000, 0x02000008,
3210x00000008, 0x02000108, 0x02004108, 0x00004008,
3220x02004000, 0x00000100, 0x00000108, 0x02004100,
3230x02004100, 0x02000108, 0x00004008, 0x02004000,
3240x00004000, 0x00000008, 0x02000008, 0x02000100,
3250x02000000, 0x00004100, 0x02004108, 0x00000000,
3260x00004108, 0x02000000, 0x00000100, 0x00004008,
3270x02000108, 0x00000100, 0x00000000, 0x02004108,
3280x02004008, 0x02004100, 0x00000108, 0x00004000,
3290x00004100, 0x02004008, 0x02000100, 0x00000108,
3300x00000008, 0x00004108, 0x02004000, 0x02000008 },
331
332/* nibble 5 */
333{ 0x20000010, 0x00080010, 0x00000000, 0x20080800,
3340x00080010, 0x00000800, 0x20000810, 0x00080000,
3350x00000810, 0x20080810, 0x00080800, 0x20000000,
3360x20000800, 0x20000010, 0x20080000, 0x00080810,
3370x00080000, 0x20000810, 0x20080010, 0x00000000,
3380x00000800, 0x00000010, 0x20080800, 0x20080010,
3390x20080810, 0x20080000, 0x20000000, 0x00000810,
3400x00000010, 0x00080800, 0x00080810, 0x20000800,
3410x00000810, 0x20000000, 0x20000800, 0x00080810,
3420x20080800, 0x00080010, 0x00000000, 0x20000800,
3430x20000000, 0x00000800, 0x20080010, 0x00080000,
3440x00080010, 0x20080810, 0x00080800, 0x00000010,
3450x20080810, 0x00080800, 0x00080000, 0x20000810,
3460x20000010, 0x20080000, 0x00080810, 0x00000000,
3470x00000800, 0x20000010, 0x20000810, 0x20080800,
3480x20080000, 0x00000810, 0x00000010, 0x20080010 },
349
350/* nibble 6 */
351{ 0x00001000, 0x00000080, 0x00400080, 0x00400001,
3520x00401081, 0x00001001, 0x00001080, 0x00000000,
3530x00400000, 0x00400081, 0x00000081, 0x00401000,
3540x00000001, 0x00401080, 0x00401000, 0x00000081,
3550x00400081, 0x00001000, 0x00001001, 0x00401081,
3560x00000000, 0x00400080, 0x00400001, 0x00001080,
3570x00401001, 0x00001081, 0x00401080, 0x00000001,
3580x00001081, 0x00401001, 0x00000080, 0x00400000,
3590x00001081, 0x00401000, 0x00401001, 0x00000081,
3600x00001000, 0x00000080, 0x00400000, 0x00401001,
3610x00400081, 0x00001081, 0x00001080, 0x00000000,
3620x00000080, 0x00400001, 0x00000001, 0x00400080,
3630x00000000, 0x00400081, 0x00400080, 0x00001080,
3640x00000081, 0x00001000, 0x00401081, 0x00400000,
3650x00401080, 0x00000001, 0x00001001, 0x00401081,
3660x00400001, 0x00401080, 0x00401000, 0x00001001 },
367
368/* nibble 7 */
369{ 0x08200020, 0x08208000, 0x00008020, 0x00000000,
3700x08008000, 0x00200020, 0x08200000, 0x08208020,
3710x00000020, 0x08000000, 0x00208000, 0x00008020,
3720x00208020, 0x08008020, 0x08000020, 0x08200000,
3730x00008000, 0x00208020, 0x00200020, 0x08008000,
3740x08208020, 0x08000020, 0x00000000, 0x00208000,
3750x08000000, 0x00200000, 0x08008020, 0x08200020,
3760x00200000, 0x00008000, 0x08208000, 0x00000020,
3770x00200000, 0x00008000, 0x08000020, 0x08208020,
3780x00008020, 0x08000000, 0x00000000, 0x00208000,
3790x08200020, 0x08008020, 0x08008000, 0x00200020,
3800x08208000, 0x00000020, 0x00200020, 0x08008000,
3810x08208020, 0x00200000, 0x08200000, 0x08000020,
3820x00208000, 0x00008020, 0x08008020, 0x08200000,
3830x00000020, 0x08208000, 0x00208020, 0x00000000,
3840x08000000, 0x08200020, 0x00008000, 0x00208020 }};
385
386/* Some stuff that used to be in des_locl.h. Heavily modified. */
387 /* IP and FP
388 * The problem is more of a geometric problem that random bit fiddling.
389 0 1 2 3 4 5 6 7 62 54 46 38 30 22 14 6
390 8 9 10 11 12 13 14 15 60 52 44 36 28 20 12 4
391 16 17 18 19 20 21 22 23 58 50 42 34 26 18 10 2
392 24 25 26 27 28 29 30 31 to 56 48 40 32 24 16 8 0
393
394 32 33 34 35 36 37 38 39 63 55 47 39 31 23 15 7
395 40 41 42 43 44 45 46 47 61 53 45 37 29 21 13 5
396 48 49 50 51 52 53 54 55 59 51 43 35 27 19 11 3
397 56 57 58 59 60 61 62 63 57 49 41 33 25 17 9 1
398
399 The output has been subject to swaps of the form
400 0 1 -> 3 1 but the odd and even bits have been put into
401 2 3 2 0
402 different words. The main trick is to remember that
403 t=((l>>size)^r)&(mask);
404 r^=t;
405 l^=(t<<size);
406 can be used to swap and move bits between words.
407
408 So l = 0 1 2 3 r = 16 17 18 19
409 4 5 6 7 20 21 22 23
410 8 9 10 11 24 25 26 27
411 12 13 14 15 28 29 30 31
412 becomes (for size == 2 and mask == 0x3333)
413 t = 2^16 3^17 -- -- l = 0 1 16 17 r = 2 3 18 19
414 6^20 7^21 -- -- 4 5 20 21 6 7 22 23
415 10^24 11^25 -- -- 8 9 24 25 10 11 24 25
416 14^28 15^29 -- -- 12 13 28 29 14 15 28 29
417
418 Thanks for hints from Richard Outerbridge - he told me IP&FP
419 could be done in 15 xor, 10 shifts and 5 ands.
420 When I finally started to think of the problem in 2D
421 I first got ~42 operations without xors. When I remembered
422 how to use xors :-) I got it to its final state.
423 */
424#define PERM_OP(a,b,t,n,m) ((t)=((((a)>>(n))^(b))&(m)),\
425 (b)^=(t),\
426 (a)^=((t)<<(n)))
427
428#define IP(l,r,t) \
429 PERM_OP(r,l,t, 4,0x0f0f0f0f); \
430 PERM_OP(l,r,t,16,0x0000ffff); \
431 PERM_OP(r,l,t, 2,0x33333333); \
432 PERM_OP(l,r,t, 8,0x00ff00ff); \
433 PERM_OP(r,l,t, 1,0x55555555);
434
435#define FP(l,r,t) \
436 PERM_OP(l,r,t, 1,0x55555555); \
437 PERM_OP(r,l,t, 8,0x00ff00ff); \
438 PERM_OP(l,r,t, 2,0x33333333); \
439 PERM_OP(r,l,t,16,0x0000ffff); \
440 PERM_OP(l,r,t, 4,0x0f0f0f0f);
441
442#define D_ENCRYPT(L,R,S) \
443 u=(R^s[S ]); \
444 t=R^s[S+1]; \
445 t=((t>>4)+(t<<28)); \
446 L^= des_SPtrans[1][(t )&0x3f]| \
447 des_SPtrans[3][(t>> 8)&0x3f]| \
448 des_SPtrans[5][(t>>16)&0x3f]| \
449 des_SPtrans[7][(t>>24)&0x3f]| \
450 des_SPtrans[0][(u )&0x3f]| \
451 des_SPtrans[2][(u>> 8)&0x3f]| \
452 des_SPtrans[4][(u>>16)&0x3f]| \
453 des_SPtrans[6][(u>>24)&0x3f];
454
455/* This part is based on code that used to be in ecb_enc.c. */
456/* Copyright (C) 1993 Eric Young - see README for more details */
457
458static void des_encrypt(word32 l, word32 r, word32 *output, DESContext *ks,
459 int encrypt)
460{
461 register word32 t,u;
462 register int i;
463 register word32 *s;
464
465 s = ks->key_schedule;
466
467 IP(l,r,t);
468 /* Things have been modified so that the initial rotate is
469 * done outside the loop. This required the
470 * des_SPtrans values in sp.h to be rotated 1 bit to the right.
471 * One perl script later and things have a 5% speed up on a sparc2.
472 * Thanks to Richard Outerbridge <71755.204@CompuServe.COM>
473 * for pointing this out. */
474 t=(r<<1)|(r>>31);
475 r=(l<<1)|(l>>31);
476 l=t;
477
478 /* I don't know if it is worth the effort of loop unrolling the
479 * inner loop */
480 if (encrypt)
481 {
482 for (i=0; i<32; i+=4)
483 {
484 D_ENCRYPT(l,r,i+0); /* 1 */
485 D_ENCRYPT(r,l,i+2); /* 2 */
486 }
487 }
488 else
489 {
490 for (i=30; i>0; i-=4)
491 {
492 D_ENCRYPT(l,r,i-0); /* 16 */
493 D_ENCRYPT(r,l,i-2); /* 15 */
494 }
495 }
496 l=(l>>1)|(l<<31);
497 r=(r>>1)|(r<<31);
498
499 FP(r,l,t);
500 output[0]=l;
501 output[1]=r;
502}
503
504/* Code based on set_key.c. */
505/* Copyright (C) 1993 Eric Young - see README for more details */
506
507#define HPERM_OP(a,t,n,m) ((t)=((((a)<<(16-(n)))^(a))&(m)),\
508 (a)=(a)^(t)^(t>>(16-(n))))
509
510static void des_set_key(unsigned char *key, DESContext *ks)
511{
512 register word32 c, d, t, s, shifts;
513 register int i;
514 register word32 *schedule;
515
516 schedule = ks->key_schedule;
517
518 c = GET_32BIT_LSB_FIRST(key);
519 d = GET_32BIT_LSB_FIRST(key + 4);
520
521 /* I now do it in 47 simple operations :-)
522 * Thanks to John Fletcher (john_fletcher@lccmail.ocf.llnl.gov)
523 * for the inspiration. :-) */
524 PERM_OP(d,c,t,4,0x0f0f0f0f);
525 HPERM_OP(c,t,-2,0xcccc0000);
526 HPERM_OP(d,t,-2,0xcccc0000);
527 PERM_OP(d,c,t,1,0x55555555);
528 PERM_OP(c,d,t,8,0x00ff00ff);
529 PERM_OP(d,c,t,1,0x55555555);
530 d = ((d & 0xff) << 16) | (d & 0xff00) |
531 ((d >> 16) & 0xff) | ((c >> 4) & 0xf000000);
532 c&=0x0fffffff;
533
534 shifts = 0x7efc;
535 for (i=0; i < 16; i++)
536 {
537 if (shifts & 1)
538 { c=((c>>2)|(c<<26)); d=((d>>2)|(d<<26)); }
539 else
540 { c=((c>>1)|(c<<27)); d=((d>>1)|(d<<27)); }
541 shifts >>= 1;
542 c&=0x0fffffff;
543 d&=0x0fffffff;
544
545 /* could be a few less shifts but I am to lazy at this
546 * point in time to investigate */
547
548 s = des_skb[0][ (c )&0x3f ] |
549 des_skb[1][((c>> 6)&0x03)|((c>> 7)&0x3c)] |
550 des_skb[2][((c>>13)&0x0f)|((c>>14)&0x30)] |
551 des_skb[3][((c>>20)&0x01)|((c>>21)&0x06)|((c>>22)&0x38)];
552
553 t = des_skb[4][ (d )&0x3f ] |
554 des_skb[5][((d>> 7)&0x03)|((d>> 8)&0x3c)] |
555 des_skb[6][ (d>>15)&0x3f ] |
556 des_skb[7][((d>>21)&0x0f)|((d>>22)&0x30)];
557
558 /* table contained 0213 4657 */
559 *schedule++ = ((t << 16) | (s & 0xffff));
560 s = ((s >> 16) | (t & 0xffff0000));
561 *schedule++ = (s << 4) | (s >> 28);
562 }
563}
564
565static void des_cbc_encrypt(DESContext *ks, unsigned char *iv,
566 unsigned char *dest, const unsigned char *src,
567 unsigned int len)
568{
569 word32 iv0, iv1, out[2];
570 unsigned int i;
571
572 assert((len & 7) == 0);
573
574 iv0 = GET_32BIT_LSB_FIRST(iv);
575 iv1 = GET_32BIT_LSB_FIRST(iv + 4);
576
577 for (i = 0; i < len; i += 8)
578 {
579 iv0 ^= GET_32BIT_LSB_FIRST(src + i);
580 iv1 ^= GET_32BIT_LSB_FIRST(src + i + 4);
581 des_encrypt(iv0, iv1, out, ks, 1);
582 iv0 = out[0];
583 iv1 = out[1];
584 PUT_32BIT_LSB_FIRST(dest + i, iv0);
585 PUT_32BIT_LSB_FIRST(dest + i + 4, iv1);
586 }
587 PUT_32BIT_LSB_FIRST(iv, iv0);
588 PUT_32BIT_LSB_FIRST(iv + 4, iv1);
589}
590
591static void des_cbc_decrypt(DESContext *ks, unsigned char *iv,
592 unsigned char *dest, const unsigned char *src,
593 unsigned int len)
594{
595 word32 iv0, iv1, d0, d1, out[2];
596 unsigned int i;
597
598 assert((len & 7) == 0);
599
600 iv0 = GET_32BIT_LSB_FIRST(iv);
601 iv1 = GET_32BIT_LSB_FIRST(iv + 4);
602
603 for (i = 0; i < len; i += 8)
604 {
605 d0 = GET_32BIT_LSB_FIRST(src + i);
606 d1 = GET_32BIT_LSB_FIRST(src + i + 4);
607 des_encrypt(d0, d1, out, ks, 0);
608 iv0 ^= out[0];
609 iv1 ^= out[1];
610 PUT_32BIT_LSB_FIRST(dest + i, iv0);
611 PUT_32BIT_LSB_FIRST(dest + i + 4, iv1);
612 iv0 = d0;
613 iv1 = d1;
614 }
615 PUT_32BIT_LSB_FIRST(iv, iv0);
616 PUT_32BIT_LSB_FIRST(iv + 4, iv1);
617}
618
619static void des_3cbc_encrypt(DESContext *ks1, unsigned char *iv1,
620 DESContext *ks2, unsigned char *iv2,
621 DESContext *ks3, unsigned char *iv3,
622 unsigned char *dest, const unsigned char *src,
623 unsigned int len)
624{
625 des_cbc_encrypt(ks1, iv1, dest, src, len);
626 des_cbc_decrypt(ks2, iv2, dest, dest, len);
627 des_cbc_encrypt(ks3, iv3, dest, dest, len);
628}
629
630static void des_3cbc_decrypt(DESContext *ks1, unsigned char *iv1,
631 DESContext *ks2, unsigned char *iv2,
632 DESContext *ks3, unsigned char *iv3,
633 unsigned char *dest, const unsigned char *src,
634 unsigned int len)
635{
636 des_cbc_decrypt(ks3, iv3, dest, src, len);
637 des_cbc_encrypt(ks2, iv2, dest, dest, len);
638 des_cbc_decrypt(ks1, iv1, dest, dest, len);
639}
640
641DESContext ekey1, ekey2, ekey3;
642unsigned char eiv1[8], eiv2[8], eiv3[8];
643
644DESContext dkey1, dkey2, dkey3;
645unsigned char div1[8], div2[8], div3[8];
646
647static void des3_sesskey(unsigned char *key) {
648 des_set_key(key, &ekey1);
649 des_set_key(key+8, &ekey2);
650 des_set_key(key+16, &ekey3);
651 memset(eiv1, 0, sizeof(eiv1));
652 memset(eiv2, 0, sizeof(eiv2));
653 memset(eiv3, 0, sizeof(eiv3));
654 des_set_key(key, &dkey1);
655 des_set_key(key+8, &dkey2);
656 des_set_key(key+16, &dkey3);
657 memset(div1, 0, sizeof(div1));
658 memset(div2, 0, sizeof(div2));
659 memset(div3, 0, sizeof(div3));
660}
661
662static void des3_encrypt_blk(unsigned char *blk, int len) {
663 des_3cbc_encrypt(&ekey1, eiv1, &ekey2, eiv2, &ekey3, eiv3, blk, blk, len);
664}
665
666static void des3_decrypt_blk(unsigned char *blk, int len) {
667 des_3cbc_decrypt(&dkey1, div1, &dkey2, div2, &dkey3, div3, blk, blk, len);
668}
669
670struct ssh_cipher ssh_3des = {
671 des3_sesskey,
672 des3_encrypt_blk,
673 des3_decrypt_blk
674};
675
676#ifdef DES_TEST
677
678void des_encrypt_buf(DESContext *ks, unsigned char *out,
679 const unsigned char *in, int encrypt)
680{
681 word32 in0, in1, output[0];
682
683 in0 = GET_32BIT_LSB_FIRST(in);
684 in1 = GET_32BIT_LSB_FIRST(in + 4);
685 des_encrypt(in0, in1, output, ks, encrypt);
686 PUT_32BIT_LSB_FIRST(out, output[0]);
687 PUT_32BIT_LSB_FIRST(out + 4, output[1]);
688}
689
690int main(int ac, char **av)
691{
692 FILE *f;
693 char line[1024], *cp;
694 int i, value;
695 unsigned char key[8], data[8], result[8], output[8];
696 DESContext ks;
697
698 while (fgets(line, sizeof(line), stdin))
699 {
700 for (i = 0; i < 8; i++)
701 {
702 if (sscanf(line + 2 * i, "%02x", &value) != 1)
703 {
704 fprintf(stderr, "1st col, i = %d, line: %s", i, line);
705 exit(1);
706 }
707 key[i] = value;
708 }
709 for (i = 0; i < 8; i++)
710 {
711 if (sscanf(line + 2 * i + 17, "%02x", &value) != 1)
712 {
713 fprintf(stderr, "2nd col, i = %d, line: %s", i, line);
714 exit(1);
715 }
716 data[i] = value;
717 }
718 for (i = 0; i < 8; i++)
719 {
720 if (sscanf(line + 2 * i + 2*17, "%02x", &value) != 1)
721 {
722 fprintf(stderr, "3rd col, i = %d, line: %s", i, line);
723 exit(1);
724 }
725 result[i] = value;
726 }
727 des_set_key(key, &ks);
728 des_encrypt_buf(&ks, output, data, 1);
729 if (memcmp(output, result, 8) != 0)
730 fprintf(stderr, "Encrypt failed: %s", line);
731 des_encrypt_buf(&ks, output, result, 0);
732 if (memcmp(output, data, 8) != 0)
733 fprintf(stderr, "Decrypt failed: %s", line);
734 }
735 exit(0);
736}
737#endif /* DES_TEST */
738
Local modifications for Simon Tatham's `PuTTY' SSH client and terminal emulator