Encrypting with DES Using a Pass Phrase : DES « Security « Java

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Java » Security » DES 




Encrypting with DES Using a Pass Phrase
    


import java.security.spec.AlgorithmParameterSpec;
import java.security.spec.KeySpec;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.PBEParameterSpec;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

class DesEncrypter {
  Cipher ecipher;

  Cipher dcipher;

  byte[] salt = { (byte0xA9(byte0x9B(byte0xC8(byte0x32(byte0x56(byte0x35,
      (byte0xE3(byte0x03 };

  DesEncrypter(String passPhrasethrows Exception {
    int iterationCount = 2;
    KeySpec keySpec = new PBEKeySpec(passPhrase.toCharArray(), salt, iterationCount);
    SecretKey key = SecretKeyFactory.getInstance("PBEWithMD5AndDES").generateSecret(keySpec);
    ecipher = Cipher.getInstance(key.getAlgorithm());
    dcipher = Cipher.getInstance(key.getAlgorithm());

    AlgorithmParameterSpec paramSpec = new PBEParameterSpec(salt, iterationCount);

    ecipher.init(Cipher.ENCRYPT_MODE, key, paramSpec);
    dcipher.init(Cipher.DECRYPT_MODE, key, paramSpec);
  }

  public String encrypt(String strthrows Exception {
    return new BASE64Encoder().encode(ecipher.doFinal(str.getBytes()));
  }

  public String decrypt(String strthrows Exception {
    return new String(dcipher.doFinal(new BASE64Decoder().decodeBuffer(str)));
  }
}

public class Main {
  public static void main(String[] argvthrows Exception {
    DesEncrypter encrypter = new DesEncrypter("My Pass Phrase!");

    String encrypted = encrypter.encrypt("Don't tell anybody!");

    String decrypted = encrypter.decrypt(encrypted);
  }
}

   
    
    
    
  














Related examples in the same category
1.DES Crypter and Decrypter
2.Decrypt an object with DES
3.Encrypt an object with DES
4.Encrypting a String with DES
5.Encrypting an Object with DES
6.Encrypting a File or Stream with DES
7.Triple DES
8.DES Engine
9.DES algorithm
10.Des Encrypter
11.DES Decrypt
12.DES Encrypt
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