Please Help!!! Encrypt/Decrypt Password

Question

i'm a newbie to Cryptography...and i know that this question have been asked MILLIONS of time...but i'm going to ask it again. i searched through the forum, and i didn't find anything useful...but:
i want to write a program to encrypt the password i type in the JPasswordField...save it out to a Properties file...when i'm trying to authentication, get the password...decrypt the password...and authentication.
i pretty much have the JPasswordField and Properties file done...i just need the encryption and decryption left.
can someone please help??? please post example code...please don't suggest hashcode!!!
sin sai

Answer 1

Try this, found at:
[ http://java.ittoolbox.com/documents/document.asp?i=1676 ]
You can convert your password to MD5 format as follows:
import java.security.*;
import java.lang.*;
public class PasswordEncrypt {
* Constructor for the PasswordEncrypt object
public PasswordEncrypt() { }
* This is the method which converts the any string value to MD5
format.
*@param str password
*@return encrypted password in MD5
public String encrypt(String str) {
StringBuffer retString = new StringBuffer();
try {
MessageDigest alg = MessageDigest.getInstance("MD5", "SUN");
String myVar = str;
byte bs[] = myVar.getBytes();
byte digest[] = alg.digest(bs);
for (int i = 0; i < digest.length; ++i) {
retString.append(Integer.toHexString(0x0100 + (digest[i] &
0x00FF)).substring(1));
} catch (Exception e) {
System.out.println("there appears to have been an error " + e);
return retString.toString();
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