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annotate src/ch/ethz/ssh2/crypto/dh/DhExchange.java @ 283:3855f58ffd2b ganymed

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start conversion from trilead to ganymed
author Carl Byington <carl@five-ten-sg.com>
date Fri, 18 Jul 2014 17:32:11 -0700
parents 91a31873c42a
children 071eccdff8ea
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
273
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1 /*
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2 * Copyright (c) 2006-2013 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.crypto.digest.HashForSSH2Types;
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12 import ch.ethz.ssh2.log.Logger;
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13 import ch.ethz.ssh2.util.StringEncoder;
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14
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15 /**
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16 * @author Christian Plattner
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17 * @version $Id: DhExchange.java 152 2014-04-28 11:02:23Z dkocher@sudo.ch $
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18 */
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19 public class DhExchange {
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20 private static final Logger log = Logger.getLogger(DhExchange.class);
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21
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22 /* Given by the standard */
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23
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24 static final BigInteger p1, p14;
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25 static final BigInteger g;
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26
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27 BigInteger p;
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28
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29 /* Client public and private */
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30
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31 BigInteger e;
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32 BigInteger x;
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33
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34 /* Server public and private */
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35
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36 BigInteger f;
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37 BigInteger y;
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38
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39 /* Shared secret */
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40
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41 BigInteger k;
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42
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43 static {
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44 final String p1_string = "17976931348623159077083915679378745319786029604875"
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45 + "60117064444236841971802161585193689478337958649255415021805654859805036464"
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46 + "40548199239100050792877003355816639229553136239076508735759914822574862575"
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47 + "00742530207744771258955095793777842444242661733472762929938766870920560605"
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48 + "0270810842907692932019128194467627007";
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49
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50 final String p14_string = "FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129"
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51 + "024E088A67CC74020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0"
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52 + "A6DF25F14374FE1356D6D51C245E485B576625E7EC6F44C42E9A637ED6B0BFF5CB"
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53 + "6F406B7EDEE386BFB5A899FA5AE9F24117C4B1FE649286651ECE45B3DC2007CB8A"
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54 + "163BF0598DA48361C55D39A69163FA8FD24CF5F83655D23DCA3AD961C62F356208"
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55 + "552BB9ED529077096966D670C354E4ABC9804F1746C08CA18217C32905E462E36C"
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56 + "E3BE39E772C180E86039B2783A2EC07A28FB5C55DF06F4C52C9DE2BCBF69558171"
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57 + "83995497CEA956AE515D2261898FA051015728E5A8AACAA68FFFFFFFFFFFFFFFF";
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58
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59 p1 = new BigInteger(p1_string);
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60 p14 = new BigInteger(p14_string, 16);
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61 g = new BigInteger("2");
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62 }
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63
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64 public DhExchange() {
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65 }
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66
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67 public void clientInit(int group, SecureRandom rnd) {
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68 k = null;
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69
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70 if(group == 1) {
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71 p = p1;
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72 }
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73 else if(group == 14) {
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74 p = p14;
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75 }
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76 else {
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77 throw new IllegalArgumentException("Unknown DH group " + group);
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78 }
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79
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80 while(true) {
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81 x = new BigInteger(p.bitLength() - 1, rnd);
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82 if(x.compareTo(BigInteger.ONE) > 0) {
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83 break;
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84 }
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85 }
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86
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87 e = g.modPow(x, p);
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88 }
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89
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90 public void serverInit(int group, SecureRandom rnd) {
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91 k = null;
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92
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93 if(group == 1) {
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94 p = p1;
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95 }
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96 else if(group == 14) {
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97 p = p14;
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98 }
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99 else {
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100 throw new IllegalArgumentException("Unknown DH group " + group);
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101 }
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102
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103 y = new BigInteger(p.bitLength() - 1, rnd);
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104
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105 f = g.modPow(y, p);
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106 }
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107
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108 /**
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109 * @return Returns the e.
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110 * @throws IllegalStateException
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111 */
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112 public BigInteger getE() {
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113 if(e == null) {
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114 throw new IllegalStateException("DhDsaExchange not initialized!");
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115 }
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116
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117 return e;
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118 }
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119
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120 /**
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121 * @return Returns the f.
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122 * @throws IllegalStateException
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123 */
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124 public BigInteger getF() {
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125 if(f == null) {
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126 throw new IllegalStateException("DhDsaExchange not initialized!");
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127 }
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128
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129 return f;
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130 }
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131
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132 /**
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133 * @return Returns the shared secret k.
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134 * @throws IllegalStateException
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135 */
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136 public BigInteger getK() {
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137 if(k == null) {
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138 throw new IllegalStateException("Shared secret not yet known, need f first!");
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139 }
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140
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141 return k;
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142 }
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143
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144 /**
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145 * @param f
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146 */
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147 public void setF(BigInteger f) {
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148 if(e == null) {
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149 throw new IllegalStateException("DhDsaExchange not initialized!");
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150 }
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151
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152 if(BigInteger.ZERO.compareTo(f) >= 0 || p.compareTo(f) <= 0) {
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153 throw new IllegalArgumentException("Invalid f specified!");
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154 }
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155
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156 this.f = f;
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157 this.k = f.modPow(x, p);
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158 }
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159
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160 /**
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161 * @param e
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162 */
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163 public void setE(BigInteger e) {
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164 if(f == null) {
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165 throw new IllegalStateException("DhDsaExchange not initialized!");
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166 }
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167
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168 if(BigInteger.ZERO.compareTo(e) >= 0 || p.compareTo(e) <= 0) {
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169 throw new IllegalArgumentException("Invalid e specified!");
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170 }
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171
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172 this.e = e;
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173 this.k = e.modPow(y, p);
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174 }
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175
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176 public byte[] calculateH(byte[] clientversion, byte[] serverversion, byte[] clientKexPayload,
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177 byte[] serverKexPayload, byte[] hostKey) throws IOException {
91a31873c42a start conversion from trilead to ganymed
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178 HashForSSH2Types hash = new HashForSSH2Types("SHA1");
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179
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180 if(log.isInfoEnabled()) {
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181 log.info("Client: '" + StringEncoder.GetString(clientversion) + "'");
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182 log.info("Server: '" + StringEncoder.GetString(serverversion) + "'");
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183 }
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184
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185 hash.updateByteString(clientversion);
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186 hash.updateByteString(serverversion);
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187 hash.updateByteString(clientKexPayload);
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diff changeset
188 hash.updateByteString(serverKexPayload);
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189 hash.updateByteString(hostKey);
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diff changeset
190 hash.updateBigInt(e);
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diff changeset
191 hash.updateBigInt(f);
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diff changeset
192 hash.updateBigInt(k);
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diff changeset
193
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194 return hash.getDigest();
91a31873c42a start conversion from trilead to ganymed
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195 }
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196 }