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
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
|
//
// System.Security.Cryptography.RC2CryptoServiceProvider.cs
//
// Authors:
// Andrew Birkett (andy@nobugs.org)
// Sebastien Pouliot (sebastien@ximian.com)
//
// Portions (C) 2002 Motus Technologies Inc. (http://www.motus.com)
// Copyright (C) 2004-2005 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
#if !NET_2_1 || MONOTOUCH
using System.Globalization;
using System.Runtime.InteropServices;
using Mono.Security.Cryptography;
namespace System.Security.Cryptography {
// References:
// a. IETF RFC2286: A Description of the RC2(r) Encryption Algorithm
// http://www.ietf.org/rfc/rfc2268.txt
#if NET_2_0
[ComVisible (true)]
#endif
public sealed class RC2CryptoServiceProvider : RC2 {
#if NET_2_0
private bool _useSalt;
#endif
public RC2CryptoServiceProvider ()
{
}
public override int EffectiveKeySize {
get { return base.EffectiveKeySize; }
set {
if (value != KeySizeValue) {
#if NET_1_1
throw new CryptographicUnexpectedOperationException (
#else
throw new CryptographicException (
#endif
Locale.GetText ("Effective key size must match key size for compatibility"));
}
base.EffectiveKeySize = value;
}
}
public override ICryptoTransform CreateDecryptor (byte[] rgbKey, byte[] rgbIV)
{
return new RC2Transform (this, false, rgbKey, rgbIV);
}
public override ICryptoTransform CreateEncryptor (byte[] rgbKey, byte[] rgbIV)
{
return new RC2Transform (this, true, rgbKey, rgbIV);
}
public override void GenerateIV ()
{
IVValue = KeyBuilder.IV (BlockSizeValue >> 3);
}
public override void GenerateKey ()
{
KeyValue = KeyBuilder.Key (KeySizeValue >> 3);
}
#if NET_2_0
[MonoTODO ("Use salt in algorithm")]
[ComVisible (false)]
public bool UseSalt {
get { return _useSalt; }
set { _useSalt = value; }
}
#endif
}
internal class RC2Transform : SymmetricTransform {
private UInt16 R0, R1, R2, R3; // state
private UInt16[] K; // expanded key
private int j; // Key indexer
public RC2Transform (RC2 rc2Algo, bool encryption, byte[] key, byte[] iv)
: base (rc2Algo, encryption, iv)
{
#if ONLY_1_1
if (key == null)
throw new ArgumentNullException ("key");
#endif
int t1 = rc2Algo.EffectiveKeySize;
if (key == null) {
key = KeyBuilder.Key (rc2Algo.KeySize >> 3);
} else {
key = (byte[]) key.Clone ();
t1 = Math.Min (t1, key.Length << 3);
}
int t = key.Length;
if (!KeySizes.IsLegalKeySize (rc2Algo.LegalKeySizes, (t << 3))) {
string msg = Locale.GetText ("Key is too small ({0} bytes), it should be between {1} and {2} bytes long.",
t, 5, 16);
throw new CryptographicException (msg);
}
// Expand key into a byte array, then convert to word
// array since we always access the key in 16bit chunks.
byte[] L = new byte [128];
int t8 = ((t1 + 7) >> 3); // divide by 8
int tm = 255 % (2 << (8 + t1 - (t8 << 3) - 1));
for (int i=0; i < t; i++)
L [i] = key [i];
for (int i=t; i < 128; i++)
L [i] = (byte) (pitable [(L [i-1] + L [i-t]) & 0xff]);
L [128-t8] = pitable [L [128-t8] & tm];
for (int i=127-t8; i >= 0; i--)
L [i] = pitable [L [i+1] ^ L [i+t8]];
K = new UInt16 [64];
int pos = 0;
for (int i=0; i < 64; i++)
K [i] = (UInt16) (L [pos++] + (L [pos++] << 8));
}
protected override void ECB (byte[] input, byte[] output)
{
// unrolled loop, eliminated mul
R0 = (UInt16) (input [0] | (input [1] << 8));
R1 = (UInt16) (input [2] | (input [3] << 8));
R2 = (UInt16) (input [4] | (input [5] << 8));
R3 = (UInt16) (input [6] | (input [7] << 8));
if (encrypt) {
j = 0;
// inline, but looped, Mix(); Mix(); Mix(); Mix(); Mix();
while (j <= 16) {
R0 += (UInt16) (K[j++] + (R3 & R2) + ((~R3) & R1));
R0 = (UInt16) ((R0 << 1) | (R0 >> 15));
R1 += (UInt16) (K[j++] + (R0 & R3) + ((~R0) & R2));
R1 = (UInt16) ((R1 << 2) | (R1 >> 14));
R2 += (UInt16) (K[j++] + (R1 & R0) + ((~R1) & R3));
R2 = (UInt16) ((R2 << 3) | (R2 >> 13));
R3 += (UInt16) (K[j++] + (R2 & R1) + ((~R2) & R0));
R3 = (UInt16) ((R3 << 5) | (R3 >> 11));
}
// inline Mash(); j == 20
R0 += K [R3 & 63];
R1 += K [R0 & 63];
R2 += K [R1 & 63];
R3 += K [R2 & 63];
// inline, but looped, Mix(); Mix(); Mix(); Mix(); Mix(); Mix();
while (j <= 40) {
R0 += (UInt16) (K[j++] + (R3 & R2) + ((~R3) & R1));
R0 = (UInt16) ((R0 << 1) | (R0 >> 15));
R1 += (UInt16) (K[j++] + (R0 & R3) + ((~R0) & R2));
R1 = (UInt16) ((R1 << 2) | (R1 >> 14));
R2 += (UInt16) (K[j++] + (R1 & R0) + ((~R1) & R3));
R2 = (UInt16) ((R2 << 3) | (R2 >> 13));
R3 += (UInt16) (K[j++] + (R2 & R1) + ((~R2) & R0));
R3 = (UInt16) ((R3 << 5) | (R3 >> 11));
}
// inline Mash(); j == 44
R0 += K [R3 & 63];
R1 += K [R0 & 63];
R2 += K [R1 & 63];
R3 += K [R2 & 63];
// inline, but looped, Mix(); Mix(); Mix(); Mix(); Mix();
while (j < 64) {
R0 += (UInt16) (K[j++] + (R3 & R2) + ((~R3) & R1));
R0 = (UInt16) ((R0 << 1) | (R0 >> 15));
R1 += (UInt16) (K[j++] + (R0 & R3) + ((~R0) & R2));
R1 = (UInt16) ((R1 << 2) | (R1 >> 14));
R2 += (UInt16) (K[j++] + (R1 & R0) + ((~R1) & R3));
R2 = (UInt16) ((R2 << 3) | (R2 >> 13));
R3 += (UInt16) (K[j++] + (R2 & R1) + ((~R2) & R0));
R3 = (UInt16) ((R3 << 5) | (R3 >> 11));
}
}
else {
j = 63;
// inline, but looped, RMix(); RMix(); RMix(); RMix(); RMix();
while (j >= 44) {
R3 = (UInt16) ((R3 >> 5) | (R3 << 11));
R3 -= (UInt16) (K[j--] + (R2 & R1) + ((~R2) & R0));
R2 = (UInt16) ((R2 >> 3) | (R2 << 13));
R2 -= (UInt16) (K[j--] + (R1 & R0) + ((~R1) & R3));
R1 = (UInt16) ((R1 >> 2) | (R1 << 14));
R1 -= (UInt16) (K[j--] + (R0 & R3) + ((~R0) & R2));
R0 = (UInt16) ((R0 >> 1) | (R0 << 15));
R0 -= (UInt16) (K[j--] + (R3 & R2) + ((~R3) & R1));
}
// inline RMash();
R3 -= K [R2 & 63];
R2 -= K [R1 & 63];
R1 -= K [R0 & 63];
R0 -= K [R3 & 63];
// inline, but looped, RMix(); RMix(); RMix(); RMix(); RMix(); RMix();
while (j >= 20) {
R3 = (UInt16) ((R3 >> 5) | (R3 << 11));
R3 -= (UInt16) (K[j--] + (R2 & R1) + ((~R2) & R0));
R2 = (UInt16) ((R2 >> 3) | (R2 << 13));
R2 -= (UInt16) (K[j--] + (R1 & R0) + ((~R1) & R3));
R1 = (UInt16) ((R1 >> 2) | (R1 << 14));
R1 -= (UInt16) (K[j--] + (R0 & R3) + ((~R0) & R2));
R0 = (UInt16) ((R0 >> 1) | (R0 << 15));
R0 -= (UInt16) (K[j--] + (R3 & R2) + ((~R3) & R1));
}
// inline RMash();
R3 -= K [R2 & 63];
R2 -= K [R1 & 63];
R1 -= K [R0 & 63];
R0 -= K [R3 & 63];
// inline, but looped, RMix(); RMix(); RMix(); RMix(); RMix();
while (j >= 0) {
R3 = (UInt16) ((R3 >> 5) | (R3 << 11));
R3 -= (UInt16) (K[j--] + (R2 & R1) + ((~R2) & R0));
R2 = (UInt16) ((R2 >> 3) | (R2 << 13));
R2 -= (UInt16) (K[j--] + (R1 & R0) + ((~R1) & R3));
R1 = (UInt16) ((R1 >> 2) | (R1 << 14));
R1 -= (UInt16) (K[j--] + (R0 & R3) + ((~R0) & R2));
R0 = (UInt16) ((R0 >> 1) | (R0 << 15));
R0 -= (UInt16) (K[j--] + (R3 & R2) + ((~R3) & R1));
}
}
// unrolled loop
output[0] = (byte) R0;
output[1] = (byte) (R0 >> 8);
output[2] = (byte) R1;
output[3] = (byte) (R1 >> 8);
output[4] = (byte) R2;
output[5] = (byte) (R2 >> 8);
output[6] = (byte) R3;
output[7] = (byte) (R3 >> 8);
}
static readonly byte[] pitable = {
0xd9, 0x78, 0xf9, 0xc4, 0x19, 0xdd, 0xb5, 0xed,
0x28, 0xe9, 0xfd, 0x79, 0x4a, 0xa0, 0xd8, 0x9d,
0xc6, 0x7e, 0x37, 0x83, 0x2b, 0x76, 0x53, 0x8e,
0x62, 0x4c, 0x64, 0x88, 0x44, 0x8b, 0xfb, 0xa2,
0x17, 0x9a, 0x59, 0xf5, 0x87, 0xb3, 0x4f, 0x13,
0x61, 0x45, 0x6d, 0x8d, 0x09, 0x81, 0x7d, 0x32,
0xbd, 0x8f, 0x40, 0xeb, 0x86, 0xb7, 0x7b, 0x0b,
0xf0, 0x95, 0x21, 0x22, 0x5c, 0x6b, 0x4e, 0x82,
0x54, 0xd6, 0x65, 0x93, 0xce, 0x60, 0xb2, 0x1c,
0x73, 0x56, 0xc0, 0x14, 0xa7, 0x8c, 0xf1, 0xdc,
0x12, 0x75, 0xca, 0x1f, 0x3b, 0xbe, 0xe4, 0xd1,
0x42, 0x3d, 0xd4, 0x30, 0xa3, 0x3c, 0xb6, 0x26,
0x6f, 0xbf, 0x0e, 0xda, 0x46, 0x69, 0x07, 0x57,
0x27, 0xf2, 0x1d, 0x9b, 0xbc, 0x94, 0x43, 0x03,
0xf8, 0x11, 0xc7, 0xf6, 0x90, 0xef, 0x3e, 0xe7,
0x06, 0xc3, 0xd5, 0x2f, 0xc8, 0x66, 0x1e, 0xd7,
0x08, 0xe8, 0xea, 0xde, 0x80, 0x52, 0xee, 0xf7,
0x84, 0xaa, 0x72, 0xac, 0x35, 0x4d, 0x6a, 0x2a,
0x96, 0x1a, 0xd2, 0x71, 0x5a, 0x15, 0x49, 0x74,
0x4b, 0x9f, 0xd0, 0x5e, 0x04, 0x18, 0xa4, 0xec,
0xc2, 0xe0, 0x41, 0x6e, 0x0f, 0x51, 0xcb, 0xcc,
0x24, 0x91, 0xaf, 0x50, 0xa1, 0xf4, 0x70, 0x39,
0x99, 0x7c, 0x3a, 0x85, 0x23, 0xb8, 0xb4, 0x7a,
0xfc, 0x02, 0x36, 0x5b, 0x25, 0x55, 0x97, 0x31,
0x2d, 0x5d, 0xfa, 0x98, 0xe3, 0x8a, 0x92, 0xae,
0x05, 0xdf, 0x29, 0x10, 0x67, 0x6c, 0xba, 0xc9,
0xd3, 0x00, 0xe6, 0xcf, 0xe1, 0x9e, 0xa8, 0x2c,
0x63, 0x16, 0x01, 0x3f, 0x58, 0xe2, 0x89, 0xa9,
0x0d, 0x38, 0x34, 0x1b, 0xab, 0x33, 0xff, 0xb0,
0xbb, 0x48, 0x0c, 0x5f, 0xb9, 0xb1, 0xcd, 0x2e,
0xc5, 0xf3, 0xdb, 0x47, 0xe5, 0xa5, 0x9c, 0x77,
0x0a, 0xa6, 0x20, 0x68, 0xfe, 0x7f, 0xc1, 0xad
};
}
}
#endif
|
