DES with ECB mode example in Java

DESECB.java

import bsr.*;
import java.security.*;
import javax.crypto.*;
import javax.crypto.spec.*;
/*A code from www.bipinrupadiya.com*/
class DESECB
{
public KeyGenerator keygenerator;
public SecretKey myDesKey;
Cipher c;



public DESECB() throws Exception
{
// Genrate the Key
keygenerator = KeyGenerator.getInstance("DES");
myDesKey = keygenerator.generateKey();

// Create the cipher
c = Cipher.getInstance("DES/ECB/PKCS5Padding");


}
public byte[] doEncryption(String s) throws Exception
{

   // Initialize the cipher for encryption
   c.init(Cipher.ENCRYPT_MODE, myDesKey);

   //sensitive information
   byte[] text = s.getBytes();

// Encrypt the text
   byte[] textEncrypted = c.doFinal(text);

return(textEncrypted);
}
public String doDecryption(byte[] s)throws Exception
{

   // Initialize the same cipher for decryption
   c.init(Cipher.DECRYPT_MODE, myDesKey);

   // Decrypt the text
   byte[] textDecrypted = c.doFinal(s);

return(new String(textDecrypted));
}
}

DES.java

import bsr.*;
/*A code from www.bipinrupadiya.com*/
public class DES
{  

public static void main(String[] argv) throws Exception
{
 
DESECB d=new DESECB();

byte[] str=d.doEncryption("BipinRupadiya");
System.out.println("Encrypted String : "+str);
System.out.println("Encrypted String : "+d.doDecryption(str));
 
}
}

To execute this code

• open two command prompt
• compile bsr package
• compile DES.java
• execute DES.java