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annotate src/ch/ethz/ssh2/crypto/dh/DhGroupExchange.java @ 380:162c001c8142

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fix url link in help file
author Carl Byington <carl@five-ten-sg.com>
date Mon, 04 Aug 2014 15:25:34 -0700
parents 1d400fd78e4a
children
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1
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2 package ch.ethz.ssh2.crypto.dh;
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3
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4 import java.math.BigInteger;
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5 import java.security.SecureRandom;
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6 import java.io.IOException;
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7
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8 import ch.ethz.ssh2.DHGexParameters;
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9 import ch.ethz.ssh2.crypto.digest.HashForSSH2Types;
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12 /**
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13 * DhGroupExchange.
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14 *
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15 * @author Christian Plattner, plattner@trilead.com
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16 * @version $Id: DhGroupExchange.java,v 1.1 2007/10/15 12:49:57 cplattne Exp $
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17 */
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18 public class DhGroupExchange {
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19 /* Given by the standard */
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20
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21 private BigInteger p;
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22 private BigInteger g;
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23
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24 /* Client public and private */
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26 private BigInteger e;
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27 private BigInteger x;
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28
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29 /* Server public */
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30
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31 private BigInteger f;
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32
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33 /* Shared secret */
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34
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35 private BigInteger k;
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36
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37 public DhGroupExchange(BigInteger p, BigInteger g) {
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38 this.p = p;
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39 this.g = g;
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40 }
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41
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42 public void init(SecureRandom rnd) {
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43 k = null;
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44 x = new BigInteger(p.bitLength() - 1, rnd);
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45 e = g.modPow(x, p);
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46 }
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47
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48 /**
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49 * @return Returns the e.
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50 */
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51 public BigInteger getE() {
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52 if (e == null)
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53 throw new IllegalStateException("Not initialized!");
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54
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55 return e;
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56 }
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57
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58 /**
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59 * @return Returns the shared secret k.
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60 */
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61 public BigInteger getK() {
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62 if (k == null)
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63 throw new IllegalStateException("Shared secret not yet known, need f first!");
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64
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65 return k;
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66 }
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67
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68 /**
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69 * Sets f and calculates the shared secret.
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70 */
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71 public void setF(BigInteger f) {
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72 if (e == null)
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73 throw new IllegalStateException("Not initialized!");
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75 BigInteger zero = BigInteger.valueOf(0);
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76
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77 if (zero.compareTo(f) >= 0 || p.compareTo(f) <= 0)
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78 throw new IllegalArgumentException("Invalid f specified!");
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80 this.f = f;
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81 this.k = f.modPow(x, p);
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82 }
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83
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84 public byte[] calculateH(String hashAlgo, byte[] clientversion, byte[] serverversion,
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85 byte[] clientKexPayload, byte[] serverKexPayload, byte[] hostKey, DHGexParameters para) throws IOException {
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86 HashForSSH2Types hash = new HashForSSH2Types(hashAlgo);
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87 hash.updateByteString(clientversion);
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88 hash.updateByteString(serverversion);
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89 hash.updateByteString(clientKexPayload);
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90 hash.updateByteString(serverKexPayload);
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91 hash.updateByteString(hostKey);
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93 if (para.getMin_group_len() > 0)
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94 hash.updateUINT32(para.getMin_group_len());
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95
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96 hash.updateUINT32(para.getPref_group_len());
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97
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98 if (para.getMax_group_len() > 0)
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99 hash.updateUINT32(para.getMax_group_len());
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100
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101 hash.updateBigInt(p);
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102 hash.updateBigInt(g);
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103 hash.updateBigInt(e);
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104 hash.updateBigInt(f);
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105 hash.updateBigInt(k);
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106 return hash.getDigest();
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107 }
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108 }