bayern.steinbrecher.jsch.jce.HMAC Maven / Gradle / Ivy

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/* -*-mode:java; c-basic-offset:2; indent-tabs-mode:nil -*- */
/*
Copyright (c) 2012-2018 ymnk, JCraft,Inc. All rights reserved.

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  1. Redistributions of source code must retain the above copyright notice,
     this list of conditions and the following disclaimer.

  2. Redistributions in binary form must reproduce the above copyright
     notice, this list of conditions and the following disclaimer in
     the documentation and/or other materials provided with the distribution.

  3. The names of the authors may not be used to endorse or promote products
     derived from this software without specific prior written permission.

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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
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*/

package bayern.steinbrecher.jsch.jce;

import bayern.steinbrecher.jsch.MAC;

import javax.crypto.Mac;
import javax.crypto.ShortBufferException;
import javax.crypto.spec.SecretKeySpec;

abstract class HMAC implements MAC {
    protected String name;
    protected int bsize;
    protected String algorithm;
    private Mac mac;

    public int getBlockSize() {
        return bsize;
    }

    ;

    public void init(byte[] key) throws Exception {
        if (key.length > bsize) {
            byte[] tmp = new byte[bsize];
            System.arraycopy(key, 0, tmp, 0, bsize);
            key = tmp;
        }
        SecretKeySpec skey = new SecretKeySpec(key, algorithm);
        mac = Mac.getInstance(algorithm);
        mac.init(skey);
    }

    private final byte[] tmp = new byte[4];

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

    public void update(byte foo[], int s, int l) {
        mac.update(foo, s, l);
    }

    public void doFinal(byte[] buf, int offset) {
        try {
            mac.doFinal(buf, offset);
        } catch (ShortBufferException e) {
            System.err.println(e);
        }
    }

    public String getName() {
        return name;
    }
}