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
|
/**
* TLSConnectionState
*
* This class encapsulates the read or write state of a TLS connection,
* and implementes the encrypting and hashing of packets.
* Copyright (c) 2007 Henri Torgemane
*
* See LICENSE.txt for full license information.
*/
package com.hurlant.crypto.tls {
import flash.utils.IDataInput;
import flash.utils.ByteArray;
import com.hurlant.crypto.hash.MD5;
import com.hurlant.crypto.hash.MAC;
import com.hurlant.crypto.hash.IHash;
import com.hurlant.crypto.symmetric.ICipher;
import com.hurlant.crypto.symmetric.IVMode;
import com.hurlant.util.Hex;
import com.hurlant.util.ArrayUtil;
public class SSLConnectionState implements IConnectionState {
// compression state
// cipher state
private var bulkCipher:uint;
private var cipherType:uint;
private var CIPHER_key:ByteArray;
private var CIPHER_IV:ByteArray;
private var cipher:ICipher;
private var ivmode:IVMode;
// mac secret
private var macAlgorithm:uint;
private var MAC_write_secret:ByteArray;
private var mac:MAC;
// sequence number. uint64
private var seq_lo:uint = 0x0;
private var seq_hi:uint = 0x0;
public function SSLConnectionState(
bulkCipher:uint=0, cipherType:uint=0, macAlgorithm:uint=0,
mac_enc:ByteArray=null, key:ByteArray=null, IV:ByteArray=null) {
this.bulkCipher = bulkCipher;
this.cipherType = cipherType;
this.macAlgorithm = macAlgorithm;
MAC_write_secret = mac_enc;
mac = MACs.getMAC(macAlgorithm);
CIPHER_key = key;
CIPHER_IV = IV;
cipher = BulkCiphers.getCipher(bulkCipher, key, 0x0300);
if (cipher is IVMode) {
ivmode = cipher as IVMode;
ivmode.IV = IV;
}
}
public function decrypt(type:uint, length:uint, p:ByteArray):ByteArray {
// decompression is a nop.
if (cipherType == BulkCiphers.STREAM_CIPHER) {
if (bulkCipher == BulkCiphers.NULL) {
// no-op
} else {
cipher.decrypt(p);
}
} else {
p.position = 0;
// block cipher
if (bulkCipher == BulkCiphers.NULL) {
} else {
var nextIV:ByteArray = new ByteArray;
nextIV.writeBytes(p, p.length-CIPHER_IV.length, CIPHER_IV.length);
p.position = 0;
cipher.decrypt(p);
CIPHER_IV = nextIV;
ivmode.IV = nextIV;
}
}
if (macAlgorithm!=MACs.NULL) {
// there will be CTX delay here as well,
// I should probably optmize the hell out of it
var data:ByteArray = new ByteArray;
var len:uint = p.length - mac.getHashSize();
data.writeUnsignedInt(seq_hi);
data.writeUnsignedInt(seq_lo);
data.writeByte(type);
data.writeShort(len);
if (len!=0) {
data.writeBytes(p, 0, len);
}
var mac_enc:ByteArray = mac.compute(MAC_write_secret, data);
// compare "mac" with the last X bytes of p.
var mac_received:ByteArray = new ByteArray;
mac_received.writeBytes(p, len, mac.getHashSize());
if (ArrayUtil.equals(mac_enc, mac_received)) {
// happy happy joy joy
} else {
throw new TLSError("Bad Mac Data", TLSError.bad_record_mac);
}
p.length = len;
p.position = 0;
}
// increment seq
seq_lo++;
if (seq_lo==0) seq_hi++;
return p;
}
public function encrypt(type:uint, p:ByteArray):ByteArray {
var mac_enc:ByteArray = null;
if (macAlgorithm!=MACs.NULL) {
var data:ByteArray = new ByteArray;
// data.writeUnsignedInt(seq);
// Sequence
data.writeUnsignedInt(seq_hi);
data.writeUnsignedInt(seq_lo);
// Type
data.writeByte(type);
// Length
data.writeShort(p.length);
// The data
if (p.length!=0) {
data.writeBytes(p);
}
// trace("data for the MAC: " + Hex.fromArray(data));
mac_enc = mac.compute(MAC_write_secret, data);
// trace("MAC: " + Hex.fromArray( mac_enc ));
p.position = p.length;
p.writeBytes(mac_enc);
}
// trace("Record to encrypt: " + Hex.fromArray(p));
p.position = 0;
if (cipherType == BulkCiphers.STREAM_CIPHER) {
// stream cipher
if (bulkCipher == BulkCiphers.NULL) {
// no-op
} else {
cipher.encrypt(p);
}
} else {
// block cipher
cipher.encrypt(p);
// adjust IV
var nextIV:ByteArray = new ByteArray;
nextIV.writeBytes(p, p.length-CIPHER_IV.length, CIPHER_IV.length);
CIPHER_IV = nextIV;
ivmode.IV = nextIV;
}
// increment seq
seq_lo++;
if (seq_lo==0) seq_hi++;
return p;
}
}
}
|
