com.hierynomus.security.bc.BCCipherFactory Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of smbj Show documentation
SMB2 protocol library for communication with Windows servers
There is a newer version: 0.13.0
/*
 * Copyright (C)2016 - SMBJ Contributors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.hierynomus.security.bc;

import com.hierynomus.protocol.commons.Factory;
import com.hierynomus.security.Cipher;
import com.hierynomus.security.SecurityException;
import org.bouncycastle.crypto.BufferedBlockCipher;
import org.bouncycastle.crypto.CipherParameters;
import org.bouncycastle.crypto.InvalidCipherTextException;
import org.bouncycastle.crypto.StreamCipher;
import org.bouncycastle.crypto.engines.DESEngine;
import org.bouncycastle.crypto.engines.RC4Engine;
import org.bouncycastle.crypto.params.DESedeParameters;
import org.bouncycastle.crypto.params.KeyParameter;

import java.util.HashMap;
import java.util.Map;

public class BCCipherFactory {
    private static final Map> lookup = new HashMap<>();

    static {
        lookup.put("DES/ECB/NoPadding", new Factory() {
            @Override
            public Cipher create() {
                return new BCBlockCipher(new BufferedBlockCipher(new DESEngine())) {
                    @Override
                    protected CipherParameters createParams(byte[] key) {
                        return new DESedeParameters(key);
                    }
                };
            }
        });
        lookup.put("RC4", new Factory() {
            @Override
            public Cipher create() {
                return new BCStreamCipher(new RC4Engine()) {
                    @Override
                    protected CipherParameters createParams(byte[] key) {
                        return new KeyParameter(key);
                    }
                };
            }
        });
    }

    public static Cipher create(String name) {
        Factory cipherFactory = lookup.get(name);
        if (cipherFactory == null) {
            throw new IllegalArgumentException("Unknown Cipher " + name);
        }
        return cipherFactory.create();
    }

    private static abstract class BCBlockCipher implements Cipher {
        private BufferedBlockCipher wrappedCipher;

        BCBlockCipher(BufferedBlockCipher bufferedBlockCipher) {
            wrappedCipher = bufferedBlockCipher;
        }

        @Override
        public void init(CryptMode cryptMode, byte[] bytes) {
            wrappedCipher.init(cryptMode == CryptMode.ENCRYPT, createParams(bytes));
        }

        @Override
        public int update(byte[] in, int inOff, int bytes, byte[] out, int outOff) {
            return wrappedCipher.processBytes(in, inOff, bytes, out, outOff);
        }

        @Override
        public int doFinal(byte[] out, int outOff) throws SecurityException {
            try {
                return wrappedCipher.doFinal(out, outOff);
            } catch (InvalidCipherTextException e) {
                throw new SecurityException(e);
            }
        }

        @Override
        public void reset() {
            wrappedCipher.reset();
        }

        protected abstract CipherParameters createParams(byte[] key);
    }

    private static abstract class BCStreamCipher implements Cipher {
        private StreamCipher streamCipher;

        BCStreamCipher(StreamCipher streamCipher) {
            this.streamCipher = streamCipher;
        }

        @Override
        public void init(CryptMode cryptMode, byte[] bytes) {
            streamCipher.init(cryptMode == CryptMode.ENCRYPT, createParams(bytes));
        }

        protected abstract CipherParameters createParams(byte[] key);

        @Override
        public int update(byte[] in, int inOff, int bytes, byte[] out, int outOff) {
            return streamCipher.processBytes(in, inOff, bytes, out, outOff);
        }

        @Override
        public int doFinal(byte[] out, int outOff) {
            streamCipher.reset();
            return 0;
        }

        @Override
        public void reset() {
            streamCipher.reset();
        }


    }

}