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
|
/**
* Crypto
*
* An abstraction layer to instanciate our crypto algorithms
* Copyright (c) 2007 Henri Torgemane
*
* See LICENSE.txt for full license information.
*/
package com.hurlant.crypto
{
import com.hurlant.crypto.hash.HMAC;
import com.hurlant.crypto.hash.MAC;
import com.hurlant.crypto.hash.IHash;
import com.hurlant.crypto.hash.MD2;
import com.hurlant.crypto.hash.MD5;
import com.hurlant.crypto.hash.SHA1;
import com.hurlant.crypto.hash.SHA224;
import com.hurlant.crypto.hash.SHA256;
import com.hurlant.crypto.prng.ARC4;
import com.hurlant.crypto.rsa.RSAKey;
import com.hurlant.crypto.symmetric.AESKey;
import com.hurlant.crypto.symmetric.BlowFishKey;
import com.hurlant.crypto.symmetric.CBCMode;
import com.hurlant.crypto.symmetric.CFB8Mode;
import com.hurlant.crypto.symmetric.CFBMode;
import com.hurlant.crypto.symmetric.CTRMode;
import com.hurlant.crypto.symmetric.DESKey;
import com.hurlant.crypto.symmetric.ECBMode;
import com.hurlant.crypto.symmetric.ICipher;
import com.hurlant.crypto.symmetric.IMode;
import com.hurlant.crypto.symmetric.IPad;
import com.hurlant.crypto.symmetric.ISymmetricKey;
import com.hurlant.crypto.symmetric.IVMode;
import com.hurlant.crypto.symmetric.NullPad;
import com.hurlant.crypto.symmetric.OFBMode;
import com.hurlant.crypto.symmetric.PKCS5;
import com.hurlant.crypto.symmetric.SimpleIVMode;
import com.hurlant.crypto.symmetric.TripleDESKey;
import com.hurlant.crypto.symmetric.XTeaKey;
import com.hurlant.util.Base64;
import flash.utils.ByteArray;
/**
* A class to make it easy to use the rest of the framework.
* As a side-effect, using this class will cause most of the framework
* to be linked into your application, which is not always what you want.
*
* If you want to optimize your download size, don't use this class.
* (But feel free to read it to get ideas on how to get the algorithm you want.)
*/
public class Crypto
{
private var b64:Base64; // we don't use it, but we want the swc to include it, so cheap trick.
public function Crypto(){
}
/**
* Things that should work, among others:
* "aes"
* "aes-128-ecb"
* "aes-128-cbc"
* "aes-128-cfb"
* "aes-128-cfb8"
* "aes-128-ofb"
* "aes-192-cfb"
* "aes-256-ofb"
* "blowfish-cbc"
* "des-ecb"
* "xtea"
* "xtea-ecb"
* "xtea-cbc"
* "xtea-cfb"
* "xtea-cfb8"
* "xtea-ofb"
* "rc4"
* "simple-aes-cbc"
*/
public static function getCipher(name:String, key:ByteArray, pad:IPad=null):ICipher {
// split name into an array.
var keys:Array = name.split("-");
switch (keys[0]) {
/**
* "simple" is a special case. It means:
* "If using an IV mode, prepend the IV to the ciphertext"
*/
case "simple":
keys.shift();
name = keys.join("-");
var cipher:ICipher = getCipher(name, key, pad);
if (cipher is IVMode) {
return new SimpleIVMode(cipher as IVMode);
} else {
return cipher;
}
/**
* we support both "aes-128" and "aes128"
* Technically, you could use "aes192-128", but you'd
* only be hurting yourself.
*/
case "aes":
case "aes128":
case "aes192":
case "aes256":
keys.shift();
if (key.length*8==keys[0]) {
// support for "aes-128-..." and such.
keys.shift();
}
return getMode(keys[0], new AESKey(key), pad);
break;
case "bf":
case "blowfish":
keys.shift();
return getMode(keys[0], new BlowFishKey(key), pad);
/**
* des-ede and des-ede3 are both equivalent to des3.
* the choice between 2tdes and 3tdes is made based
* on the length of the key provided.
*/
case "des":
keys.shift();
if (keys[0]!="ede" && keys[0]!="ede3") {
return getMode(keys[0], new DESKey(key), pad);
}
if (keys.length==1) {
keys.push("ecb"); // default mode for 2tdes and 3tdes with openssl enc
}
// fall-through to triple des
case "3des":
case "des3":
keys.shift();
return getMode(keys[0], new TripleDESKey(key), pad);
case "xtea":
keys.shift();
return getMode(keys[0], new XTeaKey(key), pad);
break;
/**
* Technically, you could say "rc4-128" or whatever,
* but really, the length of the key is what counts here.
*/
case "rc4":
keys.shift();
return new ARC4(key);
break;
}
return null;
}
/**
* Returns the size of a key for a given cipher identifier.
*/
public static function getKeySize(name:String):uint {
var keys:Array = name.split("-");
switch (keys[0]) {
case "simple":
keys.shift();
return getKeySize(keys.join("-"));
case "aes128":
return 16;
case "aes192":
return 24;
case "aes256":
return 32;
case "aes":
keys.shift();
return parseInt(keys[0])/8;
case "bf":
case "blowfish":
return 16;
case "des":
keys.shift();
switch (keys[0]) {
case "ede":
return 16;
case "ede3":
return 24;
default:
return 8;
}
case "3des":
case "des3":
return 24;
case "xtea":
return 8;
case "rc4":
if (parseInt(keys[1])>0) {
return parseInt(keys[1])/8;
}
return 16; // why not.
}
return 0; // unknown;
}
private static function getMode(name:String, alg:ISymmetricKey, padding:IPad=null):IMode {
switch (name) {
case "ecb":
return new ECBMode(alg, padding);
case "cfb":
return new CFBMode(alg, padding);
case "cfb8":
return new CFB8Mode(alg, padding);
case "ofb":
return new OFBMode(alg, padding);
case "ctr":
return new CTRMode(alg, padding);
case "cbc":
default:
return new CBCMode(alg, padding);
}
}
/**
* Things that should work:
* "md5"
* "sha"
* "sha1"
* "sha224"
* "sha256"
*/
public static function getHash(name:String):IHash {
switch(name) {
case "md2":
return new MD2;
case "md5":
return new MD5;
case "sha": // let's hope you didn't mean sha-0
case "sha1":
return new SHA1;
case "sha224":
return new SHA224;
case "sha256":
return new SHA256;
}
return null;
}
/**
* Things that should work:
* "sha1"
* "md5-64"
* "hmac-md5-96"
* "hmac-sha1-128"
* "hmac-sha256-192"
* etc.
*/
public static function getHMAC(name:String):HMAC {
var keys:Array = name.split("-");
if (keys[0]=="hmac") keys.shift();
var bits:uint = 0;
if (keys.length>1) {
bits = parseInt(keys[1]);
}
return new HMAC(getHash(keys[0]), bits);
}
public static function getMAC(name:String):MAC {
var keys:Array = name.split("-");
if (keys[0]=="mac") keys.shift();
var bits:uint = 0;
if (keys.length > 1) {
bits = parseInt(keys[1]);
}
return new MAC(getHash(keys[0]), bits);
}
public static function getPad(name:String):IPad {
switch(name) {
case "null":
return new NullPad;
case "pkcs5":
default:
return new PKCS5;
}
}
/** mostly useless.
*/
public static function getRSA(E:String, M:String):RSAKey {
return RSAKey.parsePublicKey(M,E);
}
}
}
|
