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annotate src/ch/ethz/ssh2/crypto/dh/DhGroupExchange.java @ 273:91a31873c42a ganymed

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start conversion from trilead to ganymed
author Carl Byington <carl@five-ten-sg.com>
date Fri, 18 Jul 2014 11:21:46 -0700
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children 071eccdff8ea
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1 /*
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2 * Copyright (c) 2006-2011 Christian Plattner. All rights reserved.
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3 * Please refer to the LICENSE.txt for licensing details.
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4 */
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5 package ch.ethz.ssh2.crypto.dh;
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6
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7 import java.io.IOException;
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8 import java.math.BigInteger;
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9 import java.security.SecureRandom;
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10
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11 import ch.ethz.ssh2.DHGexParameters;
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12 import ch.ethz.ssh2.crypto.digest.HashForSSH2Types;
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13
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14 /**
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15 * DhGroupExchange.
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16 *
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17 * @author Christian Plattner
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18 * @version 2.50, 03/15/10
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19 */
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20 public class DhGroupExchange {
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21 /* Given by the standard */
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22
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23 private BigInteger p;
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24 private BigInteger g;
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25
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26 /* Client public and private */
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27
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28 private BigInteger e;
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29 private BigInteger x;
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30
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31 /* Server public */
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32
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33 private BigInteger f;
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34
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35 /* Shared secret */
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36
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37 private BigInteger k;
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38
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39 public DhGroupExchange(BigInteger p, BigInteger g) {
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40 this.p = p;
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41 this.g = g;
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42 }
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43
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44 public void init(SecureRandom rnd) {
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45 k = null;
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46
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47 x = new BigInteger(p.bitLength() - 1, rnd);
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48 e = g.modPow(x, p);
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49 }
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50
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51 /**
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52 * @return Returns the e.
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53 */
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54 public BigInteger getE() {
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55 if(e == null) {
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56 throw new IllegalStateException("Not initialized!");
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57 }
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58
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59 return e;
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60 }
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61
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62 /**
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63 * @return Returns the shared secret k.
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64 */
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65 public BigInteger getK() {
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66 if(k == null) {
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67 throw new IllegalStateException("Shared secret not yet known, need f first!");
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68 }
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69
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70 return k;
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71 }
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72
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73 /**
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74 * Sets f and calculates the shared secret.
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75 */
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76 public void setF(BigInteger f) {
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77 if(e == null) {
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78 throw new IllegalStateException("Not initialized!");
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79 }
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80
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81 BigInteger zero = BigInteger.valueOf(0);
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82
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83 if(zero.compareTo(f) >= 0 || p.compareTo(f) <= 0) {
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84 throw new IllegalArgumentException("Invalid f specified!");
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85 }
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86
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87 this.f = f;
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88 this.k = f.modPow(x, p);
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89 }
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90
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91 public byte[] calculateH(byte[] clientversion, byte[] serverversion, byte[] clientKexPayload,
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92 byte[] serverKexPayload, byte[] hostKey, DHGexParameters para) throws IOException {
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93 HashForSSH2Types hash = new HashForSSH2Types("SHA1");
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94
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95 hash.updateByteString(clientversion);
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96 hash.updateByteString(serverversion);
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97 hash.updateByteString(clientKexPayload);
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98 hash.updateByteString(serverKexPayload);
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99 hash.updateByteString(hostKey);
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100 if(para.getMin_group_len() > 0) {
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101 hash.updateUINT32(para.getMin_group_len());
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102 }
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103 hash.updateUINT32(para.getPref_group_len());
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104 if(para.getMax_group_len() > 0) {
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105 hash.updateUINT32(para.getMax_group_len());
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106 }
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107 hash.updateBigInt(p);
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108 hash.updateBigInt(g);
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109 hash.updateBigInt(e);
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110 hash.updateBigInt(f);
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111 hash.updateBigInt(k);
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112
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113 return hash.getDigest();
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114 }
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115 }