DES3 Encryption example in JDK1.4

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  18 years ago

  by jacksu

  su yu

  NY,US, United States

  Joined 18 years ago

  Since DES3 has used more and more popular, here I show how to perform DES3 encryption. It compiled in JDK1.4, works
  

  
  import javax.crypto.;
  import java.security.;
  import javax.crypto.spec.*;
  

  
  public class DES3Encryption {
     public static void main(String[] args) throws Exception {
             Security.addProvider(new com.sun.crypto.provider.SunJCE());
  

  
             DESKeySpec keySpec        = new DESKeySpec("24characterpassword12345".getBytes());
             SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
         Key key            = keyFactory.generateSecret(keySpec);
  

  
             Cipher cipher = Cipher.getInstance("DES/ECB/NoPadding");
  

  
             byte[] data = "Hello World!    ".getBytes();
             System.out.println("Original data : " + new String(data));
  

  
             cipher.init(Cipher.ENCRYPT_MODE, key);
             byte[] result = cipher.doFinal(data);
             System.out.println("Encrypted data: " + toByteArrayString(result));
  

  
             cipher.init(Cipher.DECRYPT_MODE, key);
       
             byte[] original = cipher.doFinal(result);
             System.out.println("Decrypted data: " + new String(original));
       
     }
  

  
     public static String toByteArrayString(byte bBuf[]) {
     StringBuffer buf = new StringBuffer();
  

  
     for (int i = 0; i < bBuf.length; i++) {
         buf.append(to2Digit(bBuf));
     }
     return buf.toString();
     }
     public static String to2Digit(byte b) {
     String s = "0" + Integer.toHexString(b);
     return s.substring(s.length() - 2, s.length());
     }
  }
  

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