JAVA Cryptography

JAVA Cryptography

Hey Guys am new in here so take it easy on me ... i wanna ask you about java

import javax.crypto.Cipher; import javax.crypto.spec.SecretKeySpec;

/**
* Basic symmetric encryption example
*/
public class SimpleSymmetricExample
{
public static void main(String[] args) throws Exception
{
byte[] input = new byte[] {
0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,
(byte)0x88, (byte)0x99, (byte)0xaa, (byte)0xbb,
(byte)0xcc, (byte)0xdd, (byte)0xee, (byte)0xff };
byte[] keyBytes = new byte[] {
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17 };

SecretKeySpec key = new SecretKeySpec(keyBytes, "AES");

Cipher cipher = Cipher.getInstance("AES/ECB/NoPadding", "BC");

System.out.println("input text : " + Utils.toHex(input));

// encryption pass

byte[] cipherText = new byte[input.length];
cipher.init(Cipher.ENCRYPT_MODE, key);
int ctLength = cipher.update(input, 0, input.length, cipherText, 0);
ctLength += cipher.doFinal(cipherText, ctLength);
System.out.println("cipher text: " + Utils.toHex(cipherText)
+ " bytes: " + ctLength);
//decryption pass
byte[] plainText = new byte[ctLength];
cipher.init(Cipher.DECRYPT_MODE, key);
int ptLength = cipher.update(cipherText, 0, ctLength, plainText, 0);
ptLength += cipher.doFinal(plainText, ptLength);
System.out.println("plain text : " + Utils.toHex(plainText)
+ " bytes:"  + ptLength);
}
}

its about this error after running the code :

Exception in thread "main" java.security.NoSuchProviderException: No such provider: BC
    at javax.crypto.Cipher.getInstance(Cipher.java:576)
    at chapter1.SimpleSymmetricExample.main(SimpleSymmetricExample.java:24)

can anyone explain that to me ,, and how can i fix this ?? thx for you kindness :D

View Answers

March 21, 2012 at 5:18 PM

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

   public class EncryptAndDecrypt {
     public static String asHex (byte buf[]) {
      StringBuffer strbuf = new StringBuffer(buf.length * 2);
      int i;

      for (i = 0; i < buf.length; i++) {
       if (((int) buf[i] & 0xff) < 0x10)
        strbuf.append("0");

       strbuf.append(Long.toString((int) buf[i] & 0xff, 16));
      }
      return strbuf.toString();
     }

     public static void main(String[] args) throws Exception {
       String message="Welcome";
       KeyGenerator kgen = KeyGenerator.getInstance("AES");
       kgen.init(128); 
       SecretKey skey = kgen.generateKey();
       byte[] raw = skey.getEncoded();

       SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
       Cipher cipher = Cipher.getInstance("AES");

       cipher.init(Cipher.ENCRYPT_MODE, skeySpec);

       byte[] encrypted = cipher.doFinal((args.length == 0 ?"Welcome" : args[0]).getBytes());
       System.out.println("encrypted string: " + asHex(encrypted));

       cipher.init(Cipher.DECRYPT_MODE, skeySpec);
       byte[] original = cipher.doFinal(encrypted);
       String originalString = new String(original);
       System.out.println("Original string: " +originalString + " " + asHex(original));
     }
   }

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