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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.mac;

import javax.crypto.spec.SecretKeySpec;

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

/**
 * Base class for Mac implementations based on the JCE provider.
 *
 * @author Apache MINA SSHD Project
 */
public class BaseMac implements Mac {

    private final String algorithm;
    private final int defbsize;
    private final int bsize;
    private final byte[] tmp;
    private final boolean etmMode;
    private javax.crypto.Mac mac;
    private String s;

    public BaseMac(String algorithm, int bsize, int defbsize, boolean etmMode) {
        this.algorithm = algorithm;
        this.bsize = bsize;
        this.defbsize = defbsize;
        this.tmp = new byte[defbsize];
        this.etmMode = etmMode;
    }

    @Override
    public String getAlgorithm() {
        return algorithm;
    }

    @Override
    public int getBlockSize() {
        return bsize;
    }

    @Override
    public int getDefaultBlockSize() {
        return defbsize;
    }

    @Override
    public boolean isEncryptThenMac() {
        return etmMode;
    }

    @Override
    public void init(byte[] key) throws Exception {
        if (key.length > defbsize) {
            byte[] tmp = new byte[defbsize];
            System.arraycopy(key, 0, tmp, 0, defbsize);
            key = tmp;
        }

        SecretKeySpec skey = new SecretKeySpec(key, algorithm);
        mac = SecurityUtils.getMac(algorithm);
        mac.init(skey);
    }

    @Override
    public void updateUInt(long i) {
        tmp[0] = (byte) (i >>> 24);
        tmp[1] = (byte) (i >>> 16);
        tmp[2] = (byte) (i >>> 8);
        tmp[3] = (byte) i;
        update(tmp, 0, 4);
    }

    @Override
    public void update(byte[] buf, int offset, int len) {
        mac.update(buf, offset, len);
    }

    @Override
    public void doFinal(byte[] buf, int offset) throws Exception {
        int blockSize = getBlockSize();
        int defaultSize = getDefaultBlockSize();
        if (blockSize != defaultSize) {
            mac.doFinal(tmp, 0);
            System.arraycopy(tmp, 0, buf, offset, blockSize);
        } else {
            mac.doFinal(buf, offset);
        }
    }

    @Override
    public String toString() {
        synchronized (this) {
            if (s == null) {
                s = getClass().getSimpleName() + "[" + getAlgorithm() + "] - "
                    + " block=" + getBlockSize() + "/" + getDefaultBlockSize() + " bytes"
                    + ", encrypt-then-mac=" + isEncryptThenMac();
            }
        }

        return s;
    }
}