1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
|
/*
* twofish2.h
*
* Copyright (C) 2000-2003 farm9.com, Inc. All Rights Reserved.
*
* --- jsilva@farm9.com, 2 December 2003, relicensed under GPL.
*
* --- jojo@farm9.com, August 2000, converted from Java to C++, added CBC mode and
* ciphertext stealing technique, added AsciiTwofish class for easy encryption
* decryption of text strings
*
*/
/***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
***************************************************************************/
#include <stdio.h>
class TwoFish
{
// Constants
//...........................................................................
enum {
BLOCK_SIZE = 16, // bytes in a data-block
ROUNDS = 16,
TOTAL_SUBKEYS = 4 + 4 + 2*ROUNDS,
SK_BUMP = 0x01010101,
SK_ROTL = 9,
P_00 = 1,
P_01 = 0,
P_02 = 0,
P_03 = P_01 ^ 1,
P_04 = 1,
P_10 = 0,
P_11 = 0,
P_12 = 1,
P_13 = P_11 ^ 1,
P_14 = 0,
P_20 = 1,
P_21 = 1,
P_22 = 0,
P_23 = P_21 ^ 1,
P_24 = 0,
P_30 = 0,
P_31 = 1,
P_32 = 1,
P_33 = P_31 ^ 1,
P_34 = 1,
GF256_FDBK = 0x169,
GF256_FDBK_2 = 0x169 / 2,
GF256_FDBK_4 = 0x169 / 4,
RS_GF_FDBK = 0x14D, // field generator
MDS_GF_FDBK = 0x169 /* primitive polynomial for GF(256)*/
};
// Static code - to intialise the MDS matrix
//...........................................................................
private:
void precomputeMDSmatrix();
// Instance variables
//...........................................................................
/** Encrypt (false) or decrypt mode (true) */
bool decrypt;
bool outputIsFile;
bool outputIsBuffer;
bool outputIsSocket;
/** Key dependent S-box */
int sBox[4 * 256];
/** Subkeys */
int subKeys[TOTAL_SUBKEYS];
// output areas
FILE* fpout;
unsigned char* outputBuffer;
int sockfd;
public:
// Constructor
//...........................................................................
TwoFish( char* userkey, bool _decrypt, FILE* fpout, unsigned char* outbuf );
void setDecrypt( bool d ) { decrypt = d; }
void setFp( FILE* fp ) { fpout = fp; if ( fp != NULL ) outputIsFile = true; else outputIsFile = false; }
void setOutputBuffer( unsigned char* obuf ) { outputBuffer = obuf; if ( outputBuffer != NULL ) outputIsBuffer = true; else outputIsBuffer = false; }
void setSocket( int sfd ) { sockfd = sfd; if ( sfd != -1 ) outputIsSocket = true; else outputIsSocket = false; }
void blockCrypt( char* in, char* out, int size );
void blockCrypt16( char* in, char* out );
void flush();
void resetCBC() { qBlockDefined = false; }
private:
void flushOutput( char* output, int size );
void qBlockPush( char* p, char* c );
void qBlockPop( char* p, char* c );
void qBlockFlush();
char qBlockPlain[16];
char qBlockCrypt[16];
char prevCipher[16];
bool qBlockDefined;
// Private methods
//...........................................................................
void makeSubKeys( char* k );
// own methods
//...........................................................................
int RS_MDS_Encode( int k0, int k1 );
int F32( int k64Cnt, int x, int* k32 );
int Fe32( int* sBox, int x, int R );
int Fe320( int* sBox, int x );
int Fe323( int* sBox, int x );
};
char* generateKey( char* kstr );
class AsciiTwofish {
public:
AsciiTwofish( TwoFish* engine );
void encryptAscii( char* in, char* out, int outBufferSize );
void decryptAscii( char* in, char* out );
private:
TwoFish* engine;
};
|
