Java MD5 Byte Array md5(byte[] data)

Description

Compute a MD5 hash using Java built-in MessageDigest, and format the result in hex.

License

Apache License

Parameter

Parameter	Description
data	a parameter

Declaration

public static String md5(byte[] data) 

Method Source Code

//package com.java2s;
/*/*from  w  w w .j  a  va  2s  . c  o m*/
 Licensed to Diennea S.r.l. under one
 or more contributor license agreements. See the NOTICE file
 distributed with this work for additional information
 regarding copyright ownership. Diennea S.r.l. licenses this file
 to you 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.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;

public class Main {
    /**
     * Compute a MD5 hash using Java built-in MessageDigest, and format the
     * result in hex. Beware that hash-computation is a CPU intensive operation
     *
     * @param data
     * @return
     */
    public static String md5(byte[] data) {
        try {
            MessageDigest md = MessageDigest.getInstance("md5", "SUN");
            byte[] sign = md.digest(data);
            return arraytohexstring(sign);
        } catch (NoSuchAlgorithmException | NoSuchProviderException imp) {
            throw new RuntimeException(imp);
        }
    }

    public static String md5(String data) {
        return md5(data.getBytes(StandardCharsets.UTF_8));
    }

    private static String arraytohexstring(byte[] bytes) {
        StringBuilder string = new StringBuilder();
        for (byte b : bytes) {
            String hexString = Integer.toHexString(0x00FF & b);
            string.append(hexString.length() == 1 ? "0" + hexString : hexString);
        }
        return string.toString();
    }
}

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