CBC using DES with an IV based on a nonce: a hypothetical message number : Encryption « Security « Java

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Java » Security » EncryptionScreenshots 
CBC using DES with an IV based on a nonce: a hypothetical message number
  
import java.security.Security;

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

/**
 * CBC using DES with an IV based on a nonce. In this case a hypothetical
 * message number.
 */
public class MainClass {
  public static void main(String[] argsthrows Exception {
    Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());        
    byte[] input = "www.java2java.com".getBytes();
    byte[] keyBytes = new byte[] { 0x010x230x450x67(byte0x89(byte0xab(byte0xcd,
        (byte0xef };
    byte[] msgNumber = new byte[] { 0x000x000x000x000x000x000x000x00 };

    IvParameterSpec zeroIv = new IvParameterSpec(new byte[8]);
    SecretKeySpec key = new SecretKeySpec(keyBytes, "DES");
    Cipher cipher = Cipher.getInstance("DES/CBC/PKCS7Padding""BC");
    System.out.println("input : " new String(input));

    // encryption pass
    cipher.init(Cipher.ENCRYPT_MODE, key, zeroIv);
    IvParameterSpec encryptionIv = new IvParameterSpec(cipher.doFinal(msgNumber)08);

    // encrypt message
    cipher.init(Cipher.ENCRYPT_MODE, key, encryptionIv);
    byte[] cipherText = new byte[cipher.getOutputSize(input.length)];
    int ctLength = cipher.update(input, 0, input.length, cipherText, 0);
    ctLength += cipher.doFinal(cipherText, ctLength);
    System.out.println("cipher: " new String(cipherText" bytes: " + ctLength);
    cipher.init(Cipher.ENCRYPT_MODE, key, zeroIv);
    IvParameterSpec decryptionIv = new IvParameterSpec(cipher.doFinal(msgNumber)08);

    // decrypt message

    cipher.init(Cipher.DECRYPT_MODE, key, decryptionIv);
    byte[] plainText = new byte[cipher.getOutputSize(ctLength)];
    int ptLength = cipher.update(cipherText, 0, ctLength, plainText, 0);
    ptLength += cipher.doFinal(plainText, ptLength);
    System.out.println("plain : " new String(plainText" bytes: " + ptLength);
  }
}

           
         
    
  
CBCusingDESwithanIVbasedonanonce.zip( 1,199 k)
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