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/**
* 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.HMAC;
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 TLSConnectionState 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 hmac:HMAC;
// sequence number. uint64
private var seq_lo:uint;
private var seq_hi:uint;
public function TLSConnectionState(
bulkCipher:uint=0, cipherType:uint=0, macAlgorithm:uint=0,
mac:ByteArray=null, key:ByteArray=null, IV:ByteArray=null) {
this.bulkCipher = bulkCipher;
this.cipherType = cipherType;
this.macAlgorithm = macAlgorithm;
MAC_write_secret = mac;
hmac = MACs.getHMAC(macAlgorithm);
CIPHER_key = key;
CIPHER_IV = IV;
cipher = BulkCiphers.getCipher(bulkCipher, key, 0x0301);
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 {
// block cipher
var nextIV:ByteArray = new ByteArray;
nextIV.writeBytes(p, p.length-CIPHER_IV.length, CIPHER_IV.length);
cipher.decrypt(p);
CIPHER_IV = nextIV;
ivmode.IV = nextIV;
}
if (macAlgorithm!=MACs.NULL) {
var data:ByteArray = new ByteArray;
var len:uint = p.length - hmac.getHashSize();
data.writeUnsignedInt(seq_hi);
data.writeUnsignedInt(seq_lo);
data.writeByte(type);
data.writeShort(TLSSecurityParameters.PROTOCOL_VERSION);
data.writeShort(len);
if (len!=0) {
data.writeBytes(p, 0, len);
}
var mac:ByteArray = hmac.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, hmac.getHashSize());
if (ArrayUtil.equals(mac, 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:ByteArray = null;
if (macAlgorithm!=MACs.NULL) {
var data:ByteArray = new ByteArray;
data.writeUnsignedInt(seq_hi);
data.writeUnsignedInt(seq_lo);
data.writeByte(type);
data.writeShort(TLSSecurityParameters.PROTOCOL_VERSION);
data.writeShort(p.length);
if (p.length!=0) {
data.writeBytes(p, 0, p.length);
}
mac = hmac.compute(MAC_write_secret, data);
p.position = p.length;
p.writeBytes(mac);
}
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++;
// compression is a nop.
return p;
}
}
}
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