Java Hash Calculate getHashChars(byte[] bytes)

Description

get Hash Chars

License

Apache License

Declaration

private static char[] getHashChars(byte[] bytes) 

Method Source Code

//package com.java2s;
/*//from ww w.  j  ava  2  s  .c o  m
 * Copyright 2002-2009 the original author or authors.
 *
 * 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.
 */

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class Main {
    private static final char[] HEX_CHARS = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd',
            'e', 'f' };

    private static char[] getHashChars(byte[] bytes) {
        byte[] hash = getHash(bytes);
        char chars[] = new char[32];
        for (int i = 0; i < chars.length; i = i + 2) {
            byte b = hash[i / 2];
            chars[i] = HEX_CHARS[(b >>> 0x4) & 0xf];
            chars[i + 1] = HEX_CHARS[b & 0xf];
        }
        return chars;
    }

    /**
     * Calculate the MD5 hash of the given bytes.
     * @param bytes the bytes to calculate the hash over
     * @return the hash
     */
    public static byte[] getHash(byte[] bytes) {
        try {
            // MessageDigest is not thread-safe
            MessageDigest messageDigest = MessageDigest.getInstance("MD5");
            return messageDigest.digest(bytes);
        } catch (NoSuchAlgorithmException ex) {
            throw new IllegalStateException("Could not find MD5 MessageDigest instance", ex);
        }
    }
}

Related

1. getHash(String str, String algorithm)
2. getHash(String strDate)
3. getHash(String text)
4. getHash(String valueToHash)
5. getHash(String var)
6. getHashedPassword(String plainPassword)
7. getHashFromString(String str)
8. getHashInstance(final String alg)
9. getHashKey(String input)