| /* |
| * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package com.sun.crypto.provider; |
| |
| import java.security.Key; |
| import java.security.PublicKey; |
| import java.security.PrivateKey; |
| import java.security.KeyFactory; |
| import java.security.InvalidKeyException; |
| import java.security.NoSuchProviderException; |
| import java.security.NoSuchAlgorithmException; |
| import java.security.spec.PKCS8EncodedKeySpec; |
| import java.security.spec.X509EncodedKeySpec; |
| import java.security.spec.InvalidKeySpecException; |
| |
| import javax.crypto.Cipher; |
| import javax.crypto.CipherSpi; |
| import javax.crypto.SecretKey; |
| import javax.crypto.IllegalBlockSizeException; |
| import javax.crypto.BadPaddingException; |
| import javax.crypto.spec.SecretKeySpec; |
| |
| /** |
| * This class entends the javax.crypto.CipherSpi class with a concrete |
| * implementation of the methods for wrapping and unwrapping |
| * keys. |
| * |
| * @author Sharon Liu |
| * |
| * |
| * @see javax.crypto.CipherSpi |
| * @see BlowfishCipher |
| * @see DESCipher |
| * @see PBEWithMD5AndDESCipher |
| */ |
| |
| public abstract class CipherWithWrappingSpi extends CipherSpi { |
| |
| /** |
| * Wrap a key. |
| * |
| * @param key the key to be wrapped. |
| * |
| * @return the wrapped key. |
| * |
| * @exception IllegalBlockSizeException if this cipher is a block |
| * cipher, no padding has been requested, and the length of the |
| * encoding of the key to be wrapped is not a |
| * multiple of the block size. |
| * |
| * @exception InvalidKeyException if it is impossible or unsafe to |
| * wrap the key with this cipher (e.g., a hardware protected key is |
| * being passed to a software only cipher). |
| */ |
| protected final byte[] engineWrap(Key key) |
| throws IllegalBlockSizeException, InvalidKeyException |
| { |
| byte[] result = null; |
| |
| try { |
| byte[] encodedKey = key.getEncoded(); |
| if ((encodedKey == null) || (encodedKey.length == 0)) { |
| throw new InvalidKeyException("Cannot get an encoding of " + |
| "the key to be wrapped"); |
| } |
| |
| result = engineDoFinal(encodedKey, 0, encodedKey.length); |
| } catch (BadPaddingException e) { |
| // Should never happen |
| } |
| |
| return result; |
| } |
| |
| /** |
| * Unwrap a previously wrapped key. |
| * |
| * @param wrappedKey the key to be unwrapped. |
| * |
| * @param wrappedKeyAlgorithm the algorithm the wrapped key is for. |
| * |
| * @param wrappedKeyType the type of the wrapped key. |
| * This is one of <code>Cipher.SECRET_KEY</code>, |
| * <code>Cipher.PRIVATE_KEY</code>, or <code>Cipher.PUBLIC_KEY</code>. |
| * |
| * @return the unwrapped key. |
| * |
| * @exception InvalidKeyException if <code>wrappedKey</code> does not |
| * represent a wrapped key, or if the algorithm associated with the |
| * wrapped key is different from <code>wrappedKeyAlgorithm</code> |
| * and/or its key type is different from <code>wrappedKeyType</code>. |
| * |
| * @exception NoSuchAlgorithmException if no installed providers |
| * can create keys for the <code>wrappedKeyAlgorithm</code>. |
| */ |
| protected final Key engineUnwrap(byte[] wrappedKey, |
| String wrappedKeyAlgorithm, |
| int wrappedKeyType) |
| throws InvalidKeyException, NoSuchAlgorithmException |
| { |
| byte[] encodedKey; |
| Key result = null; |
| |
| try { |
| encodedKey = engineDoFinal(wrappedKey, 0, |
| wrappedKey.length); |
| } catch (BadPaddingException ePadding) { |
| throw new InvalidKeyException(); |
| } catch (IllegalBlockSizeException eBlockSize) { |
| throw new InvalidKeyException(); |
| } |
| |
| switch (wrappedKeyType) { |
| case Cipher.SECRET_KEY: |
| result = constructSecretKey(encodedKey, |
| wrappedKeyAlgorithm); |
| break; |
| case Cipher.PRIVATE_KEY: |
| result = constructPrivateKey(encodedKey, |
| wrappedKeyAlgorithm); |
| break; |
| case Cipher.PUBLIC_KEY: |
| result = constructPublicKey(encodedKey, |
| wrappedKeyAlgorithm); |
| break; |
| } |
| |
| return result; |
| |
| } |
| |
| /** |
| * Construct a public key from its encoding. |
| * |
| * @param encodedKey the encoding of a public key. |
| * |
| * @param encodedKeyAlgorithm the algorithm the encodedKey is for. |
| * |
| * @return a public key constructed from the encodedKey. |
| */ |
| private final PublicKey constructPublicKey(byte[] encodedKey, |
| String encodedKeyAlgorithm) |
| throws InvalidKeyException, NoSuchAlgorithmException |
| { |
| PublicKey key = null; |
| |
| try { |
| KeyFactory keyFactory = |
| KeyFactory.getInstance(encodedKeyAlgorithm, |
| SunJCE.getInstance()); |
| X509EncodedKeySpec keySpec = new X509EncodedKeySpec(encodedKey); |
| key = keyFactory.generatePublic(keySpec); |
| } catch (NoSuchAlgorithmException nsae) { |
| // Try to see whether there is another |
| // provider which supports this algorithm |
| try { |
| KeyFactory keyFactory = |
| KeyFactory.getInstance(encodedKeyAlgorithm); |
| X509EncodedKeySpec keySpec = |
| new X509EncodedKeySpec(encodedKey); |
| key = keyFactory.generatePublic(keySpec); |
| } catch (NoSuchAlgorithmException nsae2) { |
| throw new NoSuchAlgorithmException("No installed providers " + |
| "can create keys for the " + |
| encodedKeyAlgorithm + |
| "algorithm"); |
| } catch (InvalidKeySpecException ikse2) { |
| // Should never happen. |
| } |
| } catch (InvalidKeySpecException ikse) { |
| // Should never happen. |
| } |
| |
| return key; |
| } |
| |
| /** |
| * Construct a private key from its encoding. |
| * |
| * @param encodedKey the encoding of a private key. |
| * |
| * @param encodedKeyAlgorithm the algorithm the wrapped key is for. |
| * |
| * @return a private key constructed from the encodedKey. |
| */ |
| private final PrivateKey constructPrivateKey(byte[] encodedKey, |
| String encodedKeyAlgorithm) |
| throws InvalidKeyException, NoSuchAlgorithmException |
| { |
| PrivateKey key = null; |
| |
| try { |
| KeyFactory keyFactory = |
| KeyFactory.getInstance(encodedKeyAlgorithm, |
| SunJCE.getInstance()); |
| PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(encodedKey); |
| return keyFactory.generatePrivate(keySpec); |
| } catch (NoSuchAlgorithmException nsae) { |
| // Try to see whether there is another |
| // provider which supports this algorithm |
| try { |
| KeyFactory keyFactory = |
| KeyFactory.getInstance(encodedKeyAlgorithm); |
| PKCS8EncodedKeySpec keySpec = |
| new PKCS8EncodedKeySpec(encodedKey); |
| key = keyFactory.generatePrivate(keySpec); |
| } catch (NoSuchAlgorithmException nsae2) { |
| throw new NoSuchAlgorithmException("No installed providers " + |
| "can create keys for the " + |
| encodedKeyAlgorithm + |
| "algorithm"); |
| } catch (InvalidKeySpecException ikse2) { |
| // Should never happen. |
| } |
| } catch (InvalidKeySpecException ikse) { |
| // Should never happen. |
| } |
| |
| return key; |
| } |
| |
| /** |
| * Construct a secret key from its encoding. |
| * |
| * @param encodedKey the encoding of a secret key. |
| * |
| * @param encodedKeyAlgorithm the algorithm the secret key is for. |
| * |
| * @return a secret key constructed from the encodedKey. |
| */ |
| private final SecretKey constructSecretKey(byte[] encodedKey, |
| String encodedKeyAlgorithm) |
| { |
| return (new SecretKeySpec(encodedKey, encodedKeyAlgorithm)); |
| } |
| } |