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comparison src/com/trilead/ssh2/crypto/dh/GenericDhExchange.java @ 0:0ce5cc452d02

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initial version
author Carl Byington <carl@five-ten-sg.com>
date Thu, 22 May 2014 10:41:19 -0700
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-1:000000000000 0:0ce5cc452d02
1
2 package com.trilead.ssh2.crypto.dh;
3
4 import java.io.IOException;
5 import java.io.UnsupportedEncodingException;
6 import java.math.BigInteger;
7
8 import com.trilead.ssh2.crypto.digest.HashForSSH2Types;
9 import com.trilead.ssh2.log.Logger;
10
11
12 /**
13 * DhExchange.
14 *
15 * @author Christian Plattner, plattner@trilead.com
16 * @version $Id: DhExchange.java,v 1.2 2008/04/01 12:38:09 cplattne Exp $
17 */
18 public abstract class GenericDhExchange {
19 private static final Logger log = Logger.getLogger(GenericDhExchange.class);
20
21 /* Shared secret */
22
23 BigInteger sharedSecret;
24
25 protected GenericDhExchange() {
26 }
27
28 public static GenericDhExchange getInstance(String algo) {
29 if (algo.startsWith("ecdh-sha2-")) {
30 return new EcDhExchange();
31 }
32 else {
33 return new DhExchange();
34 }
35 }
36
37 public abstract void init(String name) throws IOException;
38
39 /**
40 * @return Returns the e (public value)
41 * @throws IllegalStateException
42 */
43 public abstract byte[] getE();
44
45 /**
46 * @return Returns the server's e (public value)
47 * @throws IllegalStateException
48 */
49 protected abstract byte[] getServerE();
50
51 /**
52 * @return Returns the shared secret k.
53 * @throws IllegalStateException
54 */
55 public BigInteger getK() {
56 if (sharedSecret == null)
57 throw new IllegalStateException("Shared secret not yet known, need f first!");
58
59 return sharedSecret;
60 }
61
62 /**
63 * @param f
64 */
65 public abstract void setF(byte[] f) throws IOException;
66
67 public byte[] calculateH(byte[] clientversion, byte[] serverversion, byte[] clientKexPayload,
68 byte[] serverKexPayload, byte[] hostKey) throws UnsupportedEncodingException {
69 HashForSSH2Types hash = new HashForSSH2Types(getHashAlgo());
70
71 if (log.isEnabled()) {
72 log.log(90, "Client: '" + new String(clientversion, "ISO-8859-1") + "'");
73 log.log(90, "Server: '" + new String(serverversion, "ISO-8859-1") + "'");
74 }
75
76 hash.updateByteString(clientversion);
77 hash.updateByteString(serverversion);
78 hash.updateByteString(clientKexPayload);
79 hash.updateByteString(serverKexPayload);
80 hash.updateByteString(hostKey);
81 hash.updateByteString(getE());
82 hash.updateByteString(getServerE());
83 hash.updateBigInt(sharedSecret);
84 return hash.getDigest();
85 }
86
87 public abstract String getHashAlgo();
88 }