Mercurial > 510Connectbot
annotate src/ch/ethz/ssh2/crypto/dh/DhExchange.java @ 315:eeb7ae13833b ganymed
add ecdsa key support everywhere
author | Carl Byington <carl@five-ten-sg.com> |
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date | Wed, 30 Jul 2014 16:36:13 -0700 |
parents | 1d400fd78e4a |
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1 /** |
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2 * |
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3 */ |
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4 package ch.ethz.ssh2.crypto.dh; |
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5 |
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6 import java.io.IOException; |
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7 import java.math.BigInteger; |
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8 import java.security.InvalidAlgorithmParameterException; |
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9 import java.security.InvalidKeyException; |
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10 import java.security.KeyFactory; |
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11 import java.security.KeyPair; |
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12 import java.security.KeyPairGenerator; |
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13 import java.security.NoSuchAlgorithmException; |
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14 import java.security.spec.InvalidKeySpecException; |
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15 |
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16 import javax.crypto.KeyAgreement; |
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17 import javax.crypto.interfaces.DHPrivateKey; |
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18 import javax.crypto.interfaces.DHPublicKey; |
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19 import javax.crypto.spec.DHParameterSpec; |
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20 import javax.crypto.spec.DHPublicKeySpec; |
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21 |
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22 /** |
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23 * @author kenny |
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24 * |
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25 */ |
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26 public class DhExchange extends GenericDhExchange { |
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27 |
307 | 28 /* Given by the standard */ |
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29 |
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30 private static final BigInteger P1 = new BigInteger( |
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31 "FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD1" |
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32 + "29024E088A67CC74020BBEA63B139B22514A08798E3404DD" |
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33 + "EF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245" |
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34 + "E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED" |
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35 + "EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE65381" |
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36 + "FFFFFFFFFFFFFFFF", 16); |
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37 |
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38 private static final BigInteger P14 = new BigInteger( |
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39 "FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD1" |
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40 + "29024E088A67CC74020BBEA63B139B22514A08798E3404DD" |
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41 + "EF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245" |
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42 + "E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED" |
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43 + "EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE45B3D" |
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44 + "C2007CB8A163BF0598DA48361C55D39A69163FA8FD24CF5F" |
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45 + "83655D23DCA3AD961C62F356208552BB9ED529077096966D" |
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46 + "670C354E4ABC9804F1746C08CA18217C32905E462E36CE3B" |
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47 + "E39E772C180E86039B2783A2EC07A28FB5C55DF06F4C52C9" |
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48 + "DE2BCBF6955817183995497CEA956AE515D2261898FA0510" |
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49 + "15728E5A8AACAA68FFFFFFFFFFFFFFFF", 16); |
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50 |
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51 private static final BigInteger G = BigInteger.valueOf(2); |
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52 |
307 | 53 /* Client public and private */ |
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54 |
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55 private DHPrivateKey clientPrivate; |
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56 private DHPublicKey clientPublic; |
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57 |
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58 /* Server public */ |
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59 |
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60 private DHPublicKey serverPublic; |
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61 private byte[] f; |
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62 |
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63 @Override |
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64 public void init(String name) throws IOException { |
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65 final DHParameterSpec spec; |
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66 |
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67 if ("diffie-hellman-group1-sha1".equals(name)) { |
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68 spec = new DHParameterSpec(P1, G); |
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69 } |
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70 else if ("diffie-hellman-group14-sha1".equals(name)) { |
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71 spec = new DHParameterSpec(P14, G); |
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72 } |
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73 else { |
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74 throw new IllegalArgumentException("Unknown DH group " + name); |
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75 } |
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76 |
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77 try { |
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78 KeyPairGenerator kpg = KeyPairGenerator.getInstance("DH"); |
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79 kpg.initialize(spec); |
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80 KeyPair pair = kpg.generateKeyPair(); |
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81 clientPrivate = (DHPrivateKey) pair.getPrivate(); |
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82 clientPublic = (DHPublicKey) pair.getPublic(); |
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83 } |
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84 catch (NoSuchAlgorithmException e) { |
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85 throw(IOException) new IOException("No DH keypair generator").initCause(e); |
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86 } |
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87 catch (InvalidAlgorithmParameterException e) { |
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88 throw(IOException) new IOException("Invalid DH parameters").initCause(e); |
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89 } |
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90 } |
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91 |
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92 @Override |
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93 public byte[] getE() { |
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94 if (clientPublic == null) |
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95 throw new IllegalStateException("DhExchange not initialized!"); |
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96 |
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97 return clientPublic.getY().toByteArray(); |
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98 } |
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99 |
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100 @Override |
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101 protected byte[] getServerE() { |
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102 if (serverPublic == null) |
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103 throw new IllegalStateException("DhExchange not initialized!"); |
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104 |
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105 return serverPublic.getY().toByteArray(); |
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106 } |
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107 |
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108 @Override |
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109 public byte[] getF() { |
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110 return f; |
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111 } |
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112 |
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113 @Override |
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114 public void setF(byte[] f) throws IOException { |
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115 if (clientPublic == null) |
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116 throw new IllegalStateException("DhExchange not initialized!"); |
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117 |
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118 final KeyAgreement ka; |
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119 |
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120 try { |
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121 KeyFactory kf = KeyFactory.getInstance("DH"); |
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122 DHParameterSpec params = clientPublic.getParams(); |
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123 this.f = f; |
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124 this.serverPublic = (DHPublicKey) kf.generatePublic(new DHPublicKeySpec( |
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125 new BigInteger(f), params.getP(), params.getG())); |
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126 ka = KeyAgreement.getInstance("DH"); |
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127 ka.init(clientPrivate); |
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128 ka.doPhase(serverPublic, true); |
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129 } |
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130 catch (NoSuchAlgorithmException e) { |
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131 throw(IOException) new IOException("No DH key agreement method").initCause(e); |
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132 } |
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133 catch (InvalidKeyException e) { |
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134 throw(IOException) new IOException("Invalid DH key").initCause(e); |
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135 } |
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136 catch (InvalidKeySpecException e) { |
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137 throw(IOException) new IOException("Invalid DH key").initCause(e); |
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138 } |
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139 |
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140 sharedSecret = new BigInteger(ka.generateSecret()); |
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141 } |
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142 |
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143 @Override |
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144 public String getHashAlgo() { |
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145 return "SHA1"; |
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146 } |
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147 } |