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annotate app/src/main/java/ch/ethz/ssh2/crypto/dh/EcDhExchange.java @ 438:d29cce60f393

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migrate from Eclipse to Android Studio
author Carl Byington <carl@five-ten-sg.com>
date Thu, 03 Dec 2015 11:23:55 -0800
parents src/ch/ethz/ssh2/crypto/dh/EcDhExchange.java@1d400fd78e4a
children
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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.interfaces.ECPrivateKey;
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15 import java.security.interfaces.ECPublicKey;
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16 import java.security.spec.ECParameterSpec;
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17 import java.security.spec.ECPoint;
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18 import java.security.spec.ECPublicKeySpec;
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19 import java.security.spec.InvalidKeySpecException;
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20
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21 import javax.crypto.KeyAgreement;
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22
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23 import ch.ethz.ssh2.signature.ECDSASHA2Verify;
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24
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25 /**
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26 * @author kenny
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27 *
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28 */
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29 public class EcDhExchange extends GenericDhExchange {
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30
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31 /* Client public and private */
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32
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33 private ECPrivateKey clientPrivate;
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34 private ECPublicKey clientPublic;
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35
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36 /* Server public */
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37
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38 private ECPublicKey serverPublic;
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39 private byte[] f;
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40
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41 @Override
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42 public void init(String name) throws IOException {
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43 final ECParameterSpec spec;
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44
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45 if ("ecdh-sha2-nistp256".equals(name)) {
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46 spec = ECDSASHA2Verify.EllipticCurves.nistp256;
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47 }
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48 else if ("ecdh-sha2-nistp384".equals(name)) {
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49 spec = ECDSASHA2Verify.EllipticCurves.nistp384;
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50 }
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51 else if ("ecdh-sha2-nistp521".equals(name)) {
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52 spec = ECDSASHA2Verify.EllipticCurves.nistp521;
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53 }
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54 else {
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55 throw new IllegalArgumentException("Unknown EC curve " + name);
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56 }
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57
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58 KeyPairGenerator kpg;
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59
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60 try {
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61 kpg = KeyPairGenerator.getInstance("EC");
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62 kpg.initialize(spec);
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63 KeyPair pair = kpg.generateKeyPair();
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64 clientPrivate = (ECPrivateKey) pair.getPrivate();
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65 clientPublic = (ECPublicKey) pair.getPublic();
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66 }
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67 catch (NoSuchAlgorithmException e) {
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68 throw(IOException) new IOException("No DH keypair generator").initCause(e);
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69 }
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70 catch (InvalidAlgorithmParameterException e) {
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71 throw(IOException) new IOException("Invalid DH parameters").initCause(e);
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72 }
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73 }
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74
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75 @Override
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76 public byte[] getE() {
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77 return ECDSASHA2Verify.encodeECPoint(clientPublic.getW(), clientPublic.getParams()
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78 .getCurve());
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79 }
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80
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81 @Override
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82 protected byte[] getServerE() {
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83 return ECDSASHA2Verify.encodeECPoint(serverPublic.getW(), serverPublic.getParams()
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84 .getCurve());
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85 }
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86
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87 @Override
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88 public byte[] getF() {
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89 return f;
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90 }
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91
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92 @Override
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93 public void setF(byte[] f) throws IOException {
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94 if (clientPublic == null)
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95 throw new IllegalStateException("DhDsaExchange not initialized!");
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96
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97 final KeyAgreement ka;
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98
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99 try {
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100 KeyFactory kf = KeyFactory.getInstance("EC");
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101 ECParameterSpec params = clientPublic.getParams();
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102 ECPoint serverPoint = ECDSASHA2Verify.decodeECPoint(f, params.getCurve());
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103 this.f = f;
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104 this.serverPublic = (ECPublicKey) kf.generatePublic(new ECPublicKeySpec(serverPoint,
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105 params));
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106 ka = KeyAgreement.getInstance("ECDH");
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107 ka.init(clientPrivate);
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108 ka.doPhase(serverPublic, true);
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109 }
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110 catch (NoSuchAlgorithmException e) {
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111 throw(IOException) new IOException("No ECDH key agreement method").initCause(e);
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112 }
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113 catch (InvalidKeyException e) {
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114 throw(IOException) new IOException("Invalid ECDH key").initCause(e);
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115 }
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116 catch (InvalidKeySpecException e) {
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117 throw(IOException) new IOException("Invalid ECDH key").initCause(e);
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118 }
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119
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120 sharedSecret = new BigInteger(ka.generateSecret());
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121 }
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122
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123 @Override
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124 public String getHashAlgo() {
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125 return ECDSASHA2Verify.getDigestAlgorithmForParams(clientPublic.getParams());
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126 }
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127 }