com.hierynomus.security.bc.BCMac 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.Mac;
import org.bouncycastle.crypto.digests.MD5Digest;
import org.bouncycastle.crypto.digests.SHA256Digest;
import org.bouncycastle.crypto.engines.AESEngine;
import org.bouncycastle.crypto.macs.CMac;
import org.bouncycastle.crypto.macs.HMac;
import org.bouncycastle.crypto.params.KeyParameter;

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

public class BCMac implements Mac {
    private static Map> lookup = new HashMap<>();

    static {
        lookup.put("HMACSHA256", new Factory() {
            @Override
            public org.bouncycastle.crypto.Mac create() {
                return new HMac(new SHA256Digest());
            }
        });
        lookup.put("HMACMD5", new Factory() {
            @Override
            public org.bouncycastle.crypto.Mac create() {
                return new HMac(new MD5Digest());
            }
        });
        lookup.put("AESCMAC", new Factory() {
            @Override
            public org.bouncycastle.crypto.Mac create() {
                return new CMac(new AESEngine());
            }
        });

    }

    private final org.bouncycastle.crypto.Mac mac;

    BCMac(String name) {
        this.mac = getMacFactory(name).create();
    }

    private Factory getMacFactory(String name) {
        Factory macFactory = lookup.get(name.toUpperCase());
        if (macFactory == null) {
            throw new IllegalArgumentException("No Mac defined for " + name);
        }
        return macFactory;
    }

    @Override
    public void init(byte[] key) {
        mac.init(new KeyParameter(key));
    }

    @Override
    public void update(byte b) {
        mac.update(b);
    }

    @Override
    public void update(byte[] array) {
        mac.update(array, 0, array.length);
    }

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

    @Override
    public byte[] doFinal() {
        byte[] output = new byte[mac.getMacSize()];
        mac.doFinal(output, 0);
        return output;
    }

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