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1 /* |
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2 * Copyright (c) 1997, 2013, 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 com.sun.crypto.provider; |
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27 |
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28 import javax.crypto.SecretKey; |
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29 import javax.crypto.SecretKeyFactorySpi; |
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30 import javax.crypto.spec.DESedeKeySpec; |
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31 import java.security.InvalidKeyException; |
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32 import java.security.spec.KeySpec; |
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33 import java.security.spec.InvalidKeySpecException; |
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34 import javax.crypto.spec.SecretKeySpec; |
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35 |
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36 /** |
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37 * This class implements the DES-EDE key factory of the Sun provider. |
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38 * |
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39 * @author Jan Luehe |
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40 * |
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41 */ |
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42 |
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43 public final class DESedeKeyFactory extends SecretKeyFactorySpi { |
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44 |
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45 /** |
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46 * Empty constructor |
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47 */ |
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48 public DESedeKeyFactory() { |
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49 } |
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50 |
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51 /** |
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52 * Generates a <code>SecretKey</code> object from the provided key |
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53 * specification (key material). |
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54 * |
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55 * @param keySpec the specification (key material) of the secret key |
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56 * |
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57 * @return the secret key |
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58 * |
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59 * @exception InvalidKeySpecException if the given key specification |
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60 * is inappropriate for this key factory to produce a public key. |
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61 */ |
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62 protected SecretKey engineGenerateSecret(KeySpec keySpec) |
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63 throws InvalidKeySpecException { |
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64 |
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65 try { |
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66 if (keySpec instanceof DESedeKeySpec) { |
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67 return new DESedeKey(((DESedeKeySpec)keySpec).getKey()); |
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68 } |
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69 if (keySpec instanceof SecretKeySpec) { |
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70 return new DESedeKey(((SecretKeySpec)keySpec).getEncoded()); |
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71 |
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72 } |
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73 throw new InvalidKeySpecException |
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74 ("Inappropriate key specification"); |
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75 } catch (InvalidKeyException e) { |
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76 throw new InvalidKeySpecException(e.getMessage()); |
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77 } |
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78 } |
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79 |
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80 /** |
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81 * Returns a specification (key material) of the given key |
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82 * in the requested format. |
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83 * |
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84 * @param key the key |
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85 * |
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86 * @param keySpec the requested format in which the key material shall be |
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87 * returned |
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88 * |
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89 * @return the underlying key specification (key material) in the |
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90 * requested format |
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91 * |
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92 * @exception InvalidKeySpecException if the requested key specification is |
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93 * inappropriate for the given key, or the given key cannot be processed |
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94 * (e.g., the given key has an unrecognized algorithm or format). |
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95 */ |
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96 protected KeySpec engineGetKeySpec(SecretKey key, Class<?> keySpec) |
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97 throws InvalidKeySpecException { |
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98 |
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99 try { |
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100 if ((key instanceof SecretKey) |
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101 && (key.getAlgorithm().equalsIgnoreCase("DESede")) |
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102 && (key.getFormat().equalsIgnoreCase("RAW"))) { |
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103 |
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104 // Check if requested key spec is amongst the valid ones |
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105 if (DESedeKeySpec.class.isAssignableFrom(keySpec)) { |
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106 return new DESedeKeySpec(key.getEncoded()); |
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107 |
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108 } else { |
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109 throw new InvalidKeySpecException |
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110 ("Inappropriate key specification"); |
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111 } |
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112 |
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113 } else { |
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114 throw new InvalidKeySpecException |
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115 ("Inappropriate key format/algorithm"); |
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116 } |
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117 } catch (InvalidKeyException e) { |
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118 throw new InvalidKeySpecException("Secret key has wrong size"); |
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119 } |
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120 } |
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121 |
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122 /** |
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123 * Translates a <code>SecretKey</code> object, whose provider may be |
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124 * unknown or potentially untrusted, into a corresponding |
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125 * <code>SecretKey</code> object of this key factory. |
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126 * |
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127 * @param key the key whose provider is unknown or untrusted |
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128 * |
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129 * @return the translated key |
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130 * |
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131 * @exception InvalidKeyException if the given key cannot be processed by |
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132 * this key factory. |
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133 */ |
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134 protected SecretKey engineTranslateKey(SecretKey key) |
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135 throws InvalidKeyException { |
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136 |
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137 try { |
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138 |
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139 if ((key != null) |
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140 && (key.getAlgorithm().equalsIgnoreCase("DESede")) |
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141 && (key.getFormat().equalsIgnoreCase("RAW"))) { |
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142 // Check if key originates from this factory |
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143 if (key instanceof com.sun.crypto.provider.DESedeKey) { |
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144 return key; |
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145 } |
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146 // Convert key to spec |
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147 DESedeKeySpec desEdeKeySpec |
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148 = (DESedeKeySpec)engineGetKeySpec(key, |
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149 DESedeKeySpec.class); |
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150 // Create key from spec, and return it |
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151 return engineGenerateSecret(desEdeKeySpec); |
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152 |
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153 } else { |
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154 throw new InvalidKeyException |
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155 ("Inappropriate key format/algorithm"); |
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156 } |
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157 |
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158 } catch (InvalidKeySpecException e) { |
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159 throw new InvalidKeyException("Cannot translate key"); |
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160 } |
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161 } |
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162 } |