Recipe017.java

package com.example.android.recipe017;

import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;

public class Recipe017 extends Activity {

    private static final String TAG = "Recipe016";

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        Log.d(TAG, md5("is same?"));
        Log.d(TAG, md5("is same?"));
        Log.d(TAG, md5("other strings."));
    }

    public static String md5(String input) {
        try {
            MessageDigest md = MessageDigest.getInstance("MD5");
            byte[] digest = md.digest(input.getBytes());
            BigInteger number = new BigInteger(1, digest);
            String md5 = number.toString(16);

            while (md5.length() < 32)
                md5 = "0" + md5;

            return md5;
        } catch (NoSuchAlgorithmException e) {
            Log.e("MD5", e.getMessage());
            return null;
        }
    }
}