001 /*
002 * Cumulus4j - Securing your data in the cloud - http://cumulus4j.org
003 * Copyright (C) 2011 NightLabs Consulting GmbH
004 *
005 * This program is free software: you can redistribute it and/or modify
006 * it under the terms of the GNU Affero General Public License as
007 * published by the Free Software Foundation, either version 3 of the
008 * License, or (at your option) any later version.
009 *
010 * This program is distributed in the hope that it will be useful,
011 * but WITHOUT ANY WARRANTY; without even the implied warranty of
012 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
013 * GNU Affero General Public License for more details.
014 *
015 * You should have received a copy of the GNU Affero General Public License
016 * along with this program. If not, see <http://www.gnu.org/licenses/>.
017 */
018 package org.cumulus4j.crypto.internal.asymmetric;
019
020 import org.bouncycastle.crypto.BufferedAsymmetricBlockCipher;
021 import org.bouncycastle.crypto.CipherParameters;
022 import org.bouncycastle.crypto.CryptoException;
023 import org.bouncycastle.crypto.DataLengthException;
024 import org.cumulus4j.crypto.AbstractCipher;
025 import org.cumulus4j.crypto.CipherOperationMode;
026
027 /**
028 * @author Marco หงุ่ยตระกูล-Schulze - marco at nightlabs dot de
029 */
030 public class AsymmetricBlockCipherImpl
031 extends AbstractCipher
032 {
033 private BufferedAsymmetricBlockCipher delegate;
034
035 public AsymmetricBlockCipherImpl(String transformation, BufferedAsymmetricBlockCipher delegate) {
036 super(transformation);
037 this.delegate = delegate;
038 }
039
040 @Override
041 public void _init(CipherOperationMode mode, CipherParameters parameters) {
042 delegate.init(CipherOperationMode.ENCRYPT == mode, parameters);
043 }
044
045 @Override
046 public int getInputBlockSize() {
047 return delegate.getInputBlockSize();
048 }
049
050 @Override
051 public int getOutputBlockSize() {
052 return delegate.getOutputBlockSize();
053 }
054
055 @Override
056 public void reset() {
057 // does not exist in delegate => not necessary?!
058 }
059
060 @Override
061 public int getUpdateOutputSize(int length) {
062 return getOutputSize(length); // this is not correct and very pessimistic, but for now, it is at least sth. that shouldn't produce any errors (the result should be >= the real value).
063 }
064
065 @Override
066 public int getOutputSize(int length) {
067 return getOutputBlockSize(); // Copied this from org.bouncycastle.jce.provider.JCERSACipher.
068 }
069
070 @Override
071 public int update(byte in, byte[] out, int outOff)
072 throws DataLengthException, IllegalStateException, CryptoException
073 {
074 delegate.processByte(in);
075 return 0;
076 }
077
078 @Override
079 public int update(byte[] in, int inOff, int inLen, byte[] out, int outOff)
080 throws DataLengthException, IllegalStateException, CryptoException
081 {
082 delegate.processBytes(in, inOff, inLen);
083 return 0;
084 }
085
086 @Override
087 public int doFinal(byte[] out, int outOff)
088 throws DataLengthException, IllegalStateException, CryptoException
089 {
090 byte[] encrypted = delegate.doFinal();
091 System.arraycopy(encrypted, 0, out, outOff, encrypted.length);
092 return encrypted.length;
093 }
094
095 @Override
096 public int getIVSize() {
097 return 0;
098 }
099
100 // @Override
101 // public AsymmetricCipherKeyPairGenerator createKeyPairGenerator(boolean initWithDefaults)
102 // {
103 // String algorithmName = CryptoRegistry.splitTransformation(getTransformation())[0];
104 // try {
105 // return CryptoRegistry.sharedInstance().createKeyPairGenerator(algorithmName, initWithDefaults);
106 // } catch (NoSuchAlgorithmException e) {
107 // throw new RuntimeException(e); // We should be able to provide an Asymmetric...KeyPairGenerator for every Cipher => RuntimeException
108 // }
109 // }
110 //
111 // @Override
112 // public SecretKeyGenerator createSecretKeyGenerator(boolean initWithDefaults)
113 // throws UnsupportedOperationException
114 // {
115 // throw new UnsupportedOperationException("This is an ASYMMETRIC cipher! Cannot get an appropriate secret key generator.");
116 // }
117 }