Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;

import java.security.MessageDigest;
import android.util.SparseArray;

public class Main {
    private static final SparseArray<String> md5Cache = new SparseArray<String>();
    private static MessageDigest MD5 = null;

    /**
     * Calculation md5 hash of string
     * 
     * @param s - string for hash calculation
     * @return md5 hash of input string
     */
    public static String MD5Hash(String s) {
        int sHash = s.hashCode();

        String result = md5Cache.get(sHash);

        if (result != null)
            return result;

        try {
            if (MD5 == null)
                MD5 = MessageDigest.getInstance("MD5");

            MessageDigest alg = (MessageDigest) MD5.clone();
            alg.update(s.getBytes());

            StringBuffer hexString = new StringBuffer(32);

            for (byte b : alg.digest())
                hexString.append(intToHexChars(0xFF & b));

            result = hexString.toString();
        } catch (Exception e) {
        }

        if (result == null)
            result = String.valueOf(s.hashCode());
        md5Cache.put(sHash, result);

        return result;
    }

    private static char[] intToHexChars(int n) {
        char[] chars = new char[2];
        for (int i = 0; i < 2; i++) {
            chars[1 - i] = toHexChar(n);
            n >>= 4;
        }
        return chars;
    }

    private static char toHexChar(int i) {
        i &= 15;
        return (i < 10) ? (char) (i + 48) : (char) (i + 87);
    }
}