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}