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How to store a MessageDigest object in Oracle Database

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import java.io.*;
import java.security.*;
import sun.misc.BASE64Encoder;
import java.sql.*;
import java.sql.Blob;
import javax.servlet.*;
import javax.servlet.http.*;

public class administratorLogin extends HttpServlet
public void service(HttpServletRequest req,HttpServletResponse res)
throws ServletException,IOException
PrintWriter out = res.getWriter();
String s1 = req.getParameter("uname");
String s2 = req.getParameter("pwd");

String s3 = s2;

MessageDigest md = MessageDigest.getInstance("SHA","SUN");

BASE64Encoder encoder = new BASE64Encoder();
String encoded = encoder.encode(md.digest());


Connection con = DriverManager.getConnection("jdbc racle:thin:@","scott","tiger");
Statement stmt = con.createStatement();
stmt.execute("insert into userlogin values('"+s1+"','"+encoded+"')");

}catch(Exception e)
out.println("Error in process " + e);

Using this code i tried to store a MessageDigest object in Oracle database but it's giving me an invalid hex error Plz help me out.
Thanx in advance
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Help us out by indicating what is throwing the exception!
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