get md5 string for input byte array buffer - Android File Input Output

Android examples for File Input Output:Byte Array

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Description

get md5 string for input byte array buffer

Demo Code


//package com.java2s;

import java.security.MessageDigest;

public class Main {
    /**//from   w w w.j a  v  a2s.c  om
     * get md5 string for input buffer
     *
     * @param buffer data to be calculated
     * @return md5 result in string format
     */
    public final static String getMessageDigest(byte[] buffer) {
        char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8',
                '9', 'a', 'b', 'c', 'd', 'e', 'f' };
        try {
            MessageDigest mdTemp = MessageDigest.getInstance("MD5");
            mdTemp.update(buffer);
            byte[] md = mdTemp.digest();
            int j = md.length;
            char str[] = new char[j * 2];
            int k = 0;
            for (int i = 0; i < j; i++) {
                byte byte0 = md[i];
                str[k++] = hexDigits[byte0 >>> 4 & 0xf];
                str[k++] = hexDigits[byte0 & 0xf];
            }
            return new String(str);
        } catch (Exception e) {
            return null;
        }
    }
}

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