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RavindraNaidu
How to encrypt password and retrive orginal password from database i.e decrypted form of password reply as early as possible.........
Thanks in advance ravindra
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May 3, 2012 at 10:46 AM
1)form.jsp:
<html> <body> <form name="userform" method="post" action="encrypt.jsp"> <table> <tr><td>User Name</td><td><input type="text" name="name"></td></tr> <tr><td>Password</td><td><input type="password" name="pass"></td></tr> <tr><td>Address</td><td><input type="text" name="address"></td></tr> <tr><td>Contact No</td><td><input type="text" name="phone"></td></tr> <tr><td><input type="submit" value="Search"></td></tr> </table> </form> </body> </html>
2)encrypt.jsp:
<%@page import="java.sql.*"%>
<%@page import=" java.security.*"%>
<%@page import="javax.crypto.*"%>
<%!
private static String algorithm = "DESede";
private static Key key = null;
private static Cipher cipher = null;
private static byte[] encrypt(String input)throws Exception {
cipher.init(Cipher.ENCRYPT_MODE, key);
byte[] inputBytes = input.getBytes();
return cipher.doFinal(inputBytes);
}
%>
<%!
private static String decrypt(byte[] encryptionBytes)throws Exception {
cipher.init(Cipher.DECRYPT_MODE, key);
byte[] recoveredBytes = cipher.doFinal(encryptionBytes);
String recovered = new String(recoveredBytes);
return recovered;
}
%>
<%
String name=request.getParameter("name");
String password=request.getParameter("pass");
String address=request.getParameter("address");
String phone=request.getParameter("phone");
int ph=Integer.parseInt(phone);
StringBuffer buffer=new StringBuffer();
key = KeyGenerator.getInstance(algorithm).generateKey();
cipher = Cipher.getInstance(algorithm);
String input = password;
System.out.println("Entered: " + input);
byte[] encryptionBytes = encrypt(input);
String passw=new String(encryptionBytes);
String connectionURL = "jdbc:mysql://localhost:3306/test";
Connection con=null;
try{
Class.forName("com.mysql.jdbc.Driver");
con = DriverManager.getConnection(connectionURL, "root", "root");
PreparedStatement ps = con.prepareStatement("INSERT INTO user(name,password,address,telno) VALUES(?,?,?,?)");
ps.setString(1,name);
ps.setString(2,passw);
ps.setString(3,address);
ps.setInt(4,ph);
int i = ps.executeUpdate();
ps.close();
}
catch(Exception ex){
System.out.println(ex);
}
try{
Statement st=con.createStatement();
ResultSet rs=st.executeQuery("Select * from user where id='1'");
String str="";
if(rs.next()){
str=rs.getString("password");
}
out.println("Your password is: "+decrypt(str.getBytes()));
System.out.println("Your password is: "+decrypt(str.getBytes()));
}
catch(Exception e){}
%>
For the above code, we have create a database table:
CREATE TABLE `user` (
`id` bigint(255) NOT NULL auto_increment,
`name` varchar(255) default NULL,
`password` varchar(255) default NULL,
`address` varchar(255) default NULL,
`telno` int(255) default NULL,
PRIMARY KEY (`id`)
);
May 3, 2012 at 10:49 AM
import java.io.*;
import java.security.*;
import javax.crypto.*;
class EncryptAndDecrypt {
public static void main (String[] args) throws Exception{
KeyPairGenerator keygenerator = KeyPairGenerator.getInstance("RSA");
SecureRandom random = SecureRandom.getInstance("SHA1PRNG", "SUN");
keygenerator.initialize(1024, random);
KeyPair keypair = keygenerator.generateKeyPair();
PrivateKey privateKey = keypair.getPrivate();
PublicKey publicKey = keypair.getPublic();
Cipher cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.ENCRYPT_MODE, publicKey);
String st= "roseindia";
byte[] cleartext = null;
cleartext = st.getBytes();
byte[] ciphertext = null;
ciphertext = cipher.doFinal(cleartext);
System.out.println("the encrypted text is: " + ciphertext.toString());
cipher.init(Cipher.DECRYPT_MODE, privateKey);
byte[] cleartext1 = cipher.doFinal(ciphertext);
System.out.println("the decrypted cleartext is: " + new String(cleartext1));
}
}
The above code will encrypt and decrypt any string.
May 5, 2012 at 11:34 AM
Hi i am using the jsp code,
it is generating error
javax.crypto.IllegalBlockSizeException: Input length must be multiple of 8 when decrypting with padded cipher
please give me some idea about........
thanks in advance surya.p
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