Image Encryption Using RC5

Er.NikKsagar

Hi everyone. I've implemented :

1. "RC5 code for encoding 2 bytes in Java" and other

2. "Blowfish Image Encryption".

Can anyone please help me for implementing "Image Encryption using RC5" ?

I'm attaching both codes txt file...

/*************************RC5 2 bytes Encryption Decryption**********************************/

package b_MainRC5;
class Main_RC5{
  public static final int w = 32;
  public static final int r = 12;
  public static final int b = 16;
  public static final int c = 4;
  public static final int t = 26;

  public int[] S = new int[t]; // expanded key table
  public int P = (int)0xb7e15163; // magic constants
  public int Q = (int)0x9e3779b9;

  void RC5_ENCRYPT(int[] pt, int[] ct){ // 2 WORD input pt/output ct
  int i;
  int A = pt[0] + S[0];
  int B = pt[1] + S[1];
  for (i = 1; i <= r; i++){
  A = (((A ^  << (B & (w - 1))) | ((A ^ >>>(w - (B & (w - 1))))) + S[2 * i];
  B = (((B ^ A) << (A & (w - 1))) | ((B ^ A)>>>(w - (A & (w - 1))))) + S[2 * i + 1];
  }
  ct[0] = A;
  ct[1] = B;
  }


  void RC5_DECRYPT(int[] ct, int[] pt){ // 2 WORD input ct/output pt
  int i;
  int B = ct[1];
  int A = ct[0];
  for (i = r; i > 0; i--){
  B = (((B - S[2 * i + 1])>>>(A & (w - 1))) | ((B - S[2 * i + 1]) << (w - (A & (w - 1))))) ^ A;
  A = (((A - S[2 * i])>>>(B & (w - 1))) | ((A - S[2 * i]) << (w - (B & (w - 1))))) ^ B;
  }
  pt[1] = B - S[1];
  pt[0] = A - S[0];
  }


  void RC5_SETUP(byte[] K){ // secret input key K[0...b-1]
  int i;
  int j;
  int k;
  int u = w / 8;
  int A;
  int B;
  int[] L = new int[c];
  /* Initialize L, then S, then mix key into S */
  for (i = b - 1,L[c - 1] = 0; i != -1; i--){
  L[i / u] = (L[i / u] << 8) + K[i];
  }
  for (S[0] = P,i = 1; i < t; i++) {
  S[i] = S[i - 1] + Q;
  }
  for (A = B = i = j = k = 0; k < 3 * t; k++,i = (i + 1) % t,j = (j + 1) % c) {// 3*t > 3*c
  A = S[i] = (((S[i] + (A + ) << (3 & (w - 1))) | ((S[i] + (A + )>>>(w - (3 & (w - 1)))));
  B = L[j] = (((L[j] + (A + ) << ((A +  & (w - 1))) | ((L[j] + (A + )>>>(w - ((A +  & (w - 1)))));
  }
  }

  public static String hex(int n) {
     // call toUpperCase() if that's required
     //return String.format("0x%8s", Integer.toHexString(n)).replace(' ', '0');
   return String.format("0x%s", Integer.toHexString(n)).replace(' ', '0');
  }


// byte[] myEncrypt(int n){
// int i;
// int j;
// int[] pt1 = new int[2]; //*
// int[] pt2 = new int[2]; //*
// int[] ct = {0,0}; //*
// byte[] key = new byte[b]; //*
//
//  pt1[0] = 0;//ct[0];
//  pt1[1] = n;//ct[1];
//
//  for (j = 0;j < b;j++){
////  key[j] = (byte) (ct[0] % (255 - j));
//  key[j] = (byte) (ct[0] % (255 - 199));
//  }
//  /* Setup, encrypt, and decrypt */
//  RC5_SETUP(key);
//  RC5_ENCRYPT(pt1, ct);
//  RC5_DECRYPT(ct, pt2);
//
//  /* Print out results, checking for decryption failure */
////  System.out.printf("\n%d. key = ",i);
//  System.out.printf("\n key = ");
//  for (j = 0; j < b; j++){
//  System.out.print(hex(key[j])+" ");
//  }
//  System.out.println("\n   plaintext:"  + pt1[1] +   " --->" +  "ciphertext:" + ct[0]+ct[1]);
//  System.out.println("   Decypted:"  + pt2[1] );
//  //System.out.printf("\n   Decrypted plaintext: (%.8lX %.8lX) \n",pt2[0], pt2[1]);
//
//  if (pt1[0] != pt2[0] || pt1[1] != pt2[1]){
//  System.out.print("Decryption Error!");
//  }
// //time (&t0);
// //RC5_ENCRYPT(ct, ct);
//  return (key);
// }
//
// void myDecrypt(byte[] key){
//// int[] pt2 = new int[2]; //*
//// RC5_SETUP(key);
//// RC5_DECRYPT(ct, pt2);
//
// }


  public static void main(String[] args){
  int i;
  int j;
  int[] pt1 = new int[2];
  int[] pt2 = new int[2];
  int[] ct = {9,7};
  byte[] key = new byte[b];

  //time_t t0, t1;
  Main_RC5 h=new  Main_RC5();

  System.out.print("RC5-32/12/16 examples:\n");
  for (i = 1;i < 6;i++){ // Initialize pt1 and key pseudorandomly based on previous ct
   pt1[0] = ct[0];
   pt1[1] = ct[1];


   for (j = 0;j < b;j++){
   key[j] = (byte) (ct[0] % (255 - j));
   }
   /* Setup, encrypt, and decrypt */
   h.RC5_SETUP(key);
   h.RC5_ENCRYPT(pt1, ct);
   h.RC5_DECRYPT(ct, pt2);


   /* Print out results, checking for decryption failure */
   System.out.printf("\n%d. key = ",i);
   for (j = 0; j < b; j++){
   System.out.print((key[j])+" ");
   }
   System.out.println("\n   Plaintext:"  + pt1[0]  + pt1[1] +   " --->" +  "ciphertext:" + ct[0]+ct[1]);
   System.out.println("   Decypted:"  + pt2[0]  + pt2[1] );


   if (pt1[0] != pt2[0] || pt1[1] != pt2[1]){
   System.out.print("Decryption Error!");
   }
  }
  }
}

Blowfish Image Encryption Code:

/***************BlowFish Image Encryption*****************/

package b_pkg;
/**
 * package;
 * package com.java.blowfish;  
**/
import java.io.File;  
import java.io.FileInputStream;  
import java.io.FileNotFoundException;  
import java.io.FileOutputStream;  
import java.io.IOException;  
import java.io.InputStream;  
import java.io.OutputStream;  
import java.security.InvalidKeyException;  
import java.security.NoSuchAlgorithmException;  
import javax.crypto.BadPaddingException;  
import javax.crypto.Cipher;  
import javax.crypto.IllegalBlockSizeException;  
import javax.crypto.KeyGenerator;  
import javax.crypto.NoSuchPaddingException;  
import javax.crypto.SecretKey;  


/** @author Nikhil Kshirsagar*/  
public class MyImageEncryption {  

  KeyGenerator keyGenerator = null;  
  SecretKey secretKey = null;  
  Cipher cipher = null;  

  public MyImageEncryption() {  
      try {  
          keyGenerator = KeyGenerator.getInstance("Blowfish");  
          secretKey = keyGenerator.generateKey();  

          cipher = Cipher.getInstance("Blowfish");  
      } catch (NoSuchPaddingException ex) {  
          System.out.println(ex);  
      } catch (NoSuchAlgorithmException ex) {  
          System.out.println(ex);  
      }  
  }  

  /** @param srcPath 
   *  @param destPath 
   * Encrypts the file in srcPath and creates a file in destPath */  
  private void encrypt(String srcPath, String destPath) {  
      File rawFile = new File(srcPath);  
      File encryptedFile = new File(destPath);  
      InputStream inStream = null;  
      OutputStream outStream = null;  
      try {  
          /** Initialize the cipher for encryption */   //main Encryption part
          cipher.init(Cipher.ENCRYPT_MODE, secretKey);  
          /** Initialize input and output streams */  
          inStream = new FileInputStream(rawFile);  
          outStream = new FileOutputStream(encryptedFile);  
          byte[] buffer = new byte[1024];  
          int len;  
          while ((len = inStream.read(buffer)) > 0) {  
              outStream.write(cipher.update(buffer, 0, len));  
              outStream.flush();  
          }  
          outStream.write(cipher.doFinal());  
          inStream.close();  
          outStream.close();  
      } catch (IllegalBlockSizeException ex) {  
          System.out.println(ex);  
      } catch (BadPaddingException ex) {  
          System.out.println(ex);  
      } catch (InvalidKeyException ex) {  
          System.out.println(ex);  
      } catch (FileNotFoundException ex) {  
          System.out.println(ex);  
      } catch (IOException ex) {  
          System.out.println(ex);  
      }  
  }  

  /** @param srcPath 
   *  @param destPath 
   * Decrypts the file in srcPath and creates a file in destPath */  
  private void decrypt(String srcPath, String destPath) {  
      File encryptedFile = new File(srcPath);  
      File decryptedFile = new File(destPath);  
      InputStream inStream = null;  
      OutputStream outStream = null;  
      try {  
          /** Initialize the cipher for decryption */   //main Decryption part
          cipher.init(Cipher.DECRYPT_MODE, secretKey);  
          /** Initialize input and output streams */  
          inStream = new FileInputStream(encryptedFile);  
          outStream = new FileOutputStream(decryptedFile);  
          byte[] buffer = new byte[1024];  
          int len;  
          while ((len = inStream.read(buffer)) > 0) {  
              outStream.write(cipher.update(buffer, 0, len));  
              outStream.flush();  
          }  
          outStream.write(cipher.doFinal());  
          inStream.close();  
          outStream.close();  
      } catch (IllegalBlockSizeException ex) {  
          System.out.println(ex);  
      } catch (BadPaddingException ex) {  
          System.out.println(ex);  
      } catch (InvalidKeyException ex) {  
          System.out.println(ex);  
      } catch (FileNotFoundException ex) {  
          System.out.println(ex);  
      } catch (IOException ex) {  
          System.out.println(ex);  
      }  
  }  
   
  public static void main(String[] args) {  
  String fileToEncrypt = "team.jpg";  
  String encryptedFile = "enc.jpg";  
  String decryptedFile = "dec.jpg";  
  String directoryPath = "D:/TEMP/";  
   
  MyImageEncryption encryptFile = new MyImageEncryption();  
  System.out.println("Starting Encryption...");  
  encryptFile.encrypt(directoryPath + fileToEncrypt,directoryPath + encryptedFile);  
  System.out.println("Starting Decryption...");  
  encryptFile.decrypt(directoryPath + encryptedFile,directoryPath + decryptedFile);  


  System.out.println("Program end...");  
  }  
}