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.MessageDigest;
020import java.security.NoSuchAlgorithmException;
021
022public class SHA1 {
023
024    /**
025     * Used by the hash method.
026     */
027    private static MessageDigest SHA1_DIGEST;
028
029    static {
030        try {
031            SHA1_DIGEST = MessageDigest.getInstance(StringUtils.SHA1);
032        }
033        catch (NoSuchAlgorithmException e) {
034            // Smack wont be able to function normally if this exception is thrown, wrap it into
035            // an ISE and make the user aware of the problem.
036            throw new IllegalStateException(e);
037        }
038    }
039
040    public static synchronized byte[] bytes(byte[] bytes) {
041        SHA1_DIGEST.update(bytes);
042        return SHA1_DIGEST.digest();
043    }
044
045    public static byte[] bytes(String string) {
046        return bytes(StringUtils.toUtf8Bytes(string));
047    }
048
049    public static String hex(byte[] bytes) {
050        return StringUtils.encodeHex(bytes(bytes));
051    }
052
053    public static String hex(String string) {
054        return hex(StringUtils.toUtf8Bytes(string));
055    }
056
057}