J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1999-2007 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun in the LICENSE file that accompanied this code. |
| 10 | * |
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 14 | * version 2 for more details (a copy is included in the LICENSE file that |
| 15 | * accompanied this code). |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License version |
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | * |
| 21 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | package com.sun.crypto.provider; |
| 27 | |
| 28 | import java.security.Key; |
| 29 | import java.security.PublicKey; |
| 30 | import java.security.PrivateKey; |
| 31 | import java.security.KeyFactory; |
| 32 | import java.security.InvalidKeyException; |
| 33 | import java.security.NoSuchProviderException; |
| 34 | import java.security.NoSuchAlgorithmException; |
| 35 | import java.security.spec.PKCS8EncodedKeySpec; |
| 36 | import java.security.spec.X509EncodedKeySpec; |
| 37 | import java.security.spec.InvalidKeySpecException; |
| 38 | |
| 39 | import javax.crypto.SecretKey; |
| 40 | import javax.crypto.Cipher; |
| 41 | import javax.crypto.spec.SecretKeySpec; |
| 42 | |
| 43 | /** |
| 44 | * This class is a helper class which construct key objects |
| 45 | * from encoded keys. |
| 46 | * |
| 47 | * @author Sharon Liu |
| 48 | * |
| 49 | */ |
| 50 | |
| 51 | final class ConstructKeys { |
| 52 | /** |
| 53 | * Construct a public key from its encoding. |
| 54 | * |
| 55 | * @param encodedKey the encoding of a public key. |
| 56 | * |
| 57 | * @param encodedKeyAlgorithm the algorithm the encodedKey is for. |
| 58 | * |
| 59 | * @return a public key constructed from the encodedKey. |
| 60 | */ |
| 61 | private static final PublicKey constructPublicKey(byte[] encodedKey, |
| 62 | String encodedKeyAlgorithm) |
| 63 | throws InvalidKeyException, NoSuchAlgorithmException |
| 64 | { |
| 65 | PublicKey key = null; |
| 66 | |
| 67 | try { |
| 68 | KeyFactory keyFactory = |
| 69 | KeyFactory.getInstance(encodedKeyAlgorithm, "SunJCE"); |
| 70 | X509EncodedKeySpec keySpec = new X509EncodedKeySpec(encodedKey); |
| 71 | key = keyFactory.generatePublic(keySpec); |
| 72 | } catch (NoSuchAlgorithmException nsae) { |
| 73 | // Try to see whether there is another |
| 74 | // provider which supports this algorithm |
| 75 | try { |
| 76 | KeyFactory keyFactory = |
| 77 | KeyFactory.getInstance(encodedKeyAlgorithm); |
| 78 | X509EncodedKeySpec keySpec = |
| 79 | new X509EncodedKeySpec(encodedKey); |
| 80 | key = keyFactory.generatePublic(keySpec); |
| 81 | } catch (NoSuchAlgorithmException nsae2) { |
| 82 | throw new NoSuchAlgorithmException("No installed providers " + |
| 83 | "can create keys for the " + |
| 84 | encodedKeyAlgorithm + |
| 85 | "algorithm"); |
| 86 | } catch (InvalidKeySpecException ikse2) { |
| 87 | InvalidKeyException ike = |
| 88 | new InvalidKeyException("Cannot construct public key"); |
| 89 | ike.initCause(ikse2); |
| 90 | throw ike; |
| 91 | } |
| 92 | } catch (InvalidKeySpecException ikse) { |
| 93 | InvalidKeyException ike = |
| 94 | new InvalidKeyException("Cannot construct public key"); |
| 95 | ike.initCause(ikse); |
| 96 | throw ike; |
| 97 | } catch (NoSuchProviderException nspe) { |
| 98 | // Should never happen. |
| 99 | } |
| 100 | |
| 101 | return key; |
| 102 | } |
| 103 | |
| 104 | /** |
| 105 | * Construct a private key from its encoding. |
| 106 | * |
| 107 | * @param encodedKey the encoding of a private key. |
| 108 | * |
| 109 | * @param encodedKeyAlgorithm the algorithm the wrapped key is for. |
| 110 | * |
| 111 | * @return a private key constructed from the encodedKey. |
| 112 | */ |
| 113 | private static final PrivateKey constructPrivateKey(byte[] encodedKey, |
| 114 | String encodedKeyAlgorithm) |
| 115 | throws InvalidKeyException, NoSuchAlgorithmException |
| 116 | { |
| 117 | PrivateKey key = null; |
| 118 | |
| 119 | try { |
| 120 | KeyFactory keyFactory = |
| 121 | KeyFactory.getInstance(encodedKeyAlgorithm, "SunJCE"); |
| 122 | PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(encodedKey); |
| 123 | return keyFactory.generatePrivate(keySpec); |
| 124 | } catch (NoSuchAlgorithmException nsae) { |
| 125 | // Try to see whether there is another |
| 126 | // provider which supports this algorithm |
| 127 | try { |
| 128 | KeyFactory keyFactory = |
| 129 | KeyFactory.getInstance(encodedKeyAlgorithm); |
| 130 | PKCS8EncodedKeySpec keySpec = |
| 131 | new PKCS8EncodedKeySpec(encodedKey); |
| 132 | key = keyFactory.generatePrivate(keySpec); |
| 133 | } catch (NoSuchAlgorithmException nsae2) { |
| 134 | throw new NoSuchAlgorithmException("No installed providers " + |
| 135 | "can create keys for the " + |
| 136 | encodedKeyAlgorithm + |
| 137 | "algorithm"); |
| 138 | } catch (InvalidKeySpecException ikse2) { |
| 139 | InvalidKeyException ike = |
| 140 | new InvalidKeyException("Cannot construct private key"); |
| 141 | ike.initCause(ikse2); |
| 142 | throw ike; |
| 143 | } |
| 144 | } catch (InvalidKeySpecException ikse) { |
| 145 | InvalidKeyException ike = |
| 146 | new InvalidKeyException("Cannot construct private key"); |
| 147 | ike.initCause(ikse); |
| 148 | throw ike; |
| 149 | } catch (NoSuchProviderException nspe) { |
| 150 | // Should never happen. |
| 151 | } |
| 152 | |
| 153 | return key; |
| 154 | } |
| 155 | |
| 156 | /** |
| 157 | * Construct a secret key from its encoding. |
| 158 | * |
| 159 | * @param encodedKey the encoding of a secret key. |
| 160 | * |
| 161 | * @param encodedKeyAlgorithm the algorithm the secret key is for. |
| 162 | * |
| 163 | * @return a secret key constructed from the encodedKey. |
| 164 | */ |
| 165 | private static final SecretKey constructSecretKey(byte[] encodedKey, |
| 166 | String encodedKeyAlgorithm) |
| 167 | { |
| 168 | return (new SecretKeySpec(encodedKey, encodedKeyAlgorithm)); |
| 169 | } |
| 170 | |
| 171 | static final Key constructKey(byte[] encoding, String keyAlgorithm, |
| 172 | int keyType) |
| 173 | throws InvalidKeyException, NoSuchAlgorithmException { |
| 174 | Key result = null; |
| 175 | switch (keyType) { |
| 176 | case Cipher.SECRET_KEY: |
| 177 | result = ConstructKeys.constructSecretKey(encoding, |
| 178 | keyAlgorithm); |
| 179 | break; |
| 180 | case Cipher.PRIVATE_KEY: |
| 181 | result = ConstructKeys.constructPrivateKey(encoding, |
| 182 | keyAlgorithm); |
| 183 | break; |
| 184 | case Cipher.PUBLIC_KEY: |
| 185 | result = ConstructKeys.constructPublicKey(encoding, |
| 186 | keyAlgorithm); |
| 187 | break; |
| 188 | } |
| 189 | return result; |
| 190 | } |
| 191 | } |