001/**
002 *
003 * Copyright © 2014 Florian Schmaus
004 *
005 * Licensed under the Apache License, Version 2.0 (the "License");
006 * you may not use this file except in compliance with the License.
007 * You may obtain a copy of the License at
008 *
009 *     http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.jivesoftware.smack.util;
018
019import java.security.InvalidKeyException;
020import java.security.NoSuchAlgorithmException;
021
022import javax.crypto.Mac;
023import javax.crypto.spec.SecretKeySpec;
024
025public class MAC {
026
027    public static final String HMACSHA1 = "HmacSHA1";
028
029    private static Mac HMAC_SHA1;
030
031    static {
032        try {
033            HMAC_SHA1 = Mac.getInstance(HMACSHA1);
034        }
035        catch (NoSuchAlgorithmException e) {
036            // Smack wont be able to function normally if this exception is thrown, wrap it into
037            // an ISE and make the user aware of the problem.
038            throw new IllegalStateException(e);
039        }
040    }
041
042
043    public static synchronized byte[] hmacsha1(SecretKeySpec key, byte[] input) throws InvalidKeyException {
044        HMAC_SHA1.init(key);
045        return HMAC_SHA1.doFinal(input);
046    }
047
048    public static byte[] hmacsha1(byte[] keyBytes, byte[] input) throws InvalidKeyException {
049        SecretKeySpec key = new SecretKeySpec(keyBytes, HMACSHA1);
050        return hmacsha1(key, input);
051    }
052
053
054}