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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you 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 org.apache.sshd.common.cipher;

import javax.crypto.spec.SecretKeySpec;

import org.apache.sshd.common.util.security.SecurityUtils;

/**
 * @author Apache MINA SSHD Project
 */
public class BaseRC4Cipher extends BaseCipher {
    public static final int SKIP_SIZE = 1536;

    public BaseRC4Cipher(int ivsize, int kdfSize, int keySize, int blkSize) {
        super(ivsize, 0, kdfSize, "ARCFOUR", keySize, "RC4", blkSize);
    }

    @Override
    protected byte[] initializeIVData(Mode mode, byte[] iv, int reqLen) {
        return iv; // not used in any way
    }

    @Override
    protected javax.crypto.Cipher createCipherInstance(Mode mode, byte[] key, byte[] iv) throws Exception {
        javax.crypto.Cipher instance = SecurityUtils.getCipher(getTransformation());
        instance.init(
                Mode.Encrypt.equals(mode)
                        ? javax.crypto.Cipher.ENCRYPT_MODE
                        : javax.crypto.Cipher.DECRYPT_MODE,
                new SecretKeySpec(key, getAlgorithm()));

        byte[] foo = new byte[1];
        for (int i = 0; i < SKIP_SIZE; i++) {
            instance.update(foo, 0, 1, foo, 0);
        }

        return instance;
    }

    @Override
    public void update(byte[] input, int inputOffset, int inputLen) throws Exception {
        getCipherInstance().update(input, inputOffset, inputLen, input, inputOffset);
    }
}