1 /* |
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2 * Copyright (c) 2006, 2017, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. Oracle designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Oracle in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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22 * or visit www.oracle.com if you need additional information or have any |
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23 * questions. |
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24 */ |
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25 |
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26 package sun.security.ssl; |
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27 |
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28 import java.security.*; |
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29 import java.security.interfaces.ECPublicKey; |
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30 import java.security.spec.*; |
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31 |
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32 import java.util.EnumSet; |
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33 import javax.crypto.SecretKey; |
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34 import javax.crypto.KeyAgreement; |
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35 import javax.net.ssl.SSLHandshakeException; |
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36 |
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37 /** |
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38 * Helper class for the ECDH key exchange. It generates the appropriate |
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39 * ephemeral keys as necessary and performs the actual shared secret derivation. |
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40 * |
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41 * @since 1.6 |
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42 * @author Andreas Sterbenz |
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43 */ |
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44 final class ECDHCrypt { |
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45 |
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46 // our private key |
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47 private PrivateKey privateKey; |
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48 |
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49 // our public key |
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50 private ECPublicKey publicKey; |
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51 |
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52 // Called by ServerHandshaker for static ECDH |
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53 ECDHCrypt(PrivateKey privateKey, PublicKey publicKey) { |
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54 this.privateKey = privateKey; |
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55 this.publicKey = (ECPublicKey)publicKey; |
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56 } |
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57 |
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58 // Called by ServerHandshaker for ephemeral ECDH |
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59 ECDHCrypt(NamedGroup namedGroup, SecureRandom random) { |
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60 try { |
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61 KeyPairGenerator kpg = JsseJce.getKeyPairGenerator("EC"); |
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62 ECGenParameterSpec params = |
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63 SupportedGroupsExtension.getECGenParamSpec(namedGroup); |
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64 kpg.initialize(params, random); |
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65 KeyPair kp = kpg.generateKeyPair(); |
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66 privateKey = kp.getPrivate(); |
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67 publicKey = (ECPublicKey)kp.getPublic(); |
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68 } catch (GeneralSecurityException e) { |
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69 throw new RuntimeException("Could not generate ECDH keypair", e); |
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70 } |
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71 } |
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72 |
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73 // Called by ClientHandshaker with params it received from the server |
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74 ECDHCrypt(ECParameterSpec params, SecureRandom random) { |
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75 try { |
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76 KeyPairGenerator kpg = JsseJce.getKeyPairGenerator("EC"); |
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77 kpg.initialize(params, random); |
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78 KeyPair kp = kpg.generateKeyPair(); |
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79 privateKey = kp.getPrivate(); |
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80 publicKey = (ECPublicKey)kp.getPublic(); |
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81 } catch (GeneralSecurityException e) { |
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82 throw new RuntimeException("Could not generate ECDH keypair", e); |
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83 } |
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84 } |
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85 |
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86 /** |
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87 * Gets the public key of this end of the key exchange. |
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88 */ |
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89 PublicKey getPublicKey() { |
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90 return publicKey; |
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91 } |
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92 |
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93 // called by ClientHandshaker with either the server's static or |
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94 // ephemeral public key |
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95 SecretKey getAgreedSecret( |
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96 PublicKey peerPublicKey) throws SSLHandshakeException { |
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97 |
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98 try { |
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99 KeyAgreement ka = JsseJce.getKeyAgreement("ECDH"); |
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100 ka.init(privateKey); |
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101 ka.doPhase(peerPublicKey, true); |
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102 return ka.generateSecret("TlsPremasterSecret"); |
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103 } catch (GeneralSecurityException e) { |
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104 throw (SSLHandshakeException) new SSLHandshakeException( |
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105 "Could not generate secret").initCause(e); |
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106 } |
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107 } |
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108 |
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109 // called by ServerHandshaker |
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110 SecretKey getAgreedSecret( |
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111 byte[] encodedPoint) throws SSLHandshakeException { |
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112 |
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113 try { |
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114 ECParameterSpec params = publicKey.getParams(); |
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115 ECPoint point = |
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116 JsseJce.decodePoint(encodedPoint, params.getCurve()); |
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117 KeyFactory kf = JsseJce.getKeyFactory("EC"); |
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118 ECPublicKeySpec spec = new ECPublicKeySpec(point, params); |
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119 PublicKey peerPublicKey = kf.generatePublic(spec); |
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120 return getAgreedSecret(peerPublicKey); |
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121 } catch (GeneralSecurityException | java.io.IOException e) { |
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122 throw (SSLHandshakeException) new SSLHandshakeException( |
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123 "Could not generate secret").initCause(e); |
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124 } |
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125 } |
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126 |
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127 // Check constraints of the specified EC public key. |
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128 void checkConstraints(AlgorithmConstraints constraints, |
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129 byte[] encodedPoint) throws SSLHandshakeException { |
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130 |
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131 try { |
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132 |
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133 ECParameterSpec params = publicKey.getParams(); |
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134 ECPoint point = |
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135 JsseJce.decodePoint(encodedPoint, params.getCurve()); |
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136 ECPublicKeySpec spec = new ECPublicKeySpec(point, params); |
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137 |
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138 KeyFactory kf = JsseJce.getKeyFactory("EC"); |
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139 ECPublicKey publicKey = (ECPublicKey)kf.generatePublic(spec); |
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140 |
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141 // check constraints of ECPublicKey |
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142 if (!constraints.permits( |
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143 EnumSet.of(CryptoPrimitive.KEY_AGREEMENT), publicKey)) { |
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144 throw new SSLHandshakeException( |
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145 "ECPublicKey does not comply to algorithm constraints"); |
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146 } |
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147 } catch (GeneralSecurityException | java.io.IOException e) { |
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148 throw (SSLHandshakeException) new SSLHandshakeException( |
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149 "Could not generate ECPublicKey").initCause(e); |
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150 } |
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151 } |
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152 |
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153 } |
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