blowfish | Tech Tips & Tricks

Encrypt And Decrypt Using Blowfish In Java

July 15, 2009 by blogmeister·45 Comments

Java Cryptography classes offer a variety of ways for you to encrypt and decrypt. One of them is using Blowfish. The methods below encrypt and decrypt Strings using a String key as its secret key.

public static String encryptBlowfish(String to_encrypt, String strkey) {
  try {
    SecretKeySpec key = new SecretKeySpec(strkey.getBytes(), "Blowfish");
     Cipher cipher = Cipher.getInstance("Blowfish");
     cipher.init(Cipher.ENCRYPT_MODE, key);
     return new String(cipher.doFinal(to_encrypt.getBytes()));
  } catch (Exception e) { return null; }
}
public static String decryptBlowfish(String to_decrypt, String strkey) {
  try {
     SecretKeySpec key = new SecretKeySpec(strkey.getBytes(), "Blowfish");
     Cipher cipher = Cipher.getInstance("Blowfish");
     cipher.init(Cipher.DECRYPT_MODE, key);
     byte[] decrypted = cipher.doFinal(to_decrypt.getBytes());
     return new String(decrypted);
  } catch (Exception e) { return null; }
}

public static String encryptBlowfish(String to_encrypt, String strkey) {

try {

SecretKeySpec key = new SecretKeySpec(strkey.getBytes(), "Blowfish");

Cipher cipher = Cipher.getInstance("Blowfish");

cipher.init(Cipher.ENCRYPT_MODE, key);

return new String(cipher.doFinal(to_encrypt.getBytes()));

} catch (Exception e) { return null; }

}

public static String decryptBlowfish(String to_decrypt, String strkey) {

try {

SecretKeySpec key = new SecretKeySpec(strkey.getBytes(), "Blowfish");

Cipher cipher = Cipher.getInstance("Blowfish");

cipher.init(Cipher.DECRYPT_MODE, key);

byte[] decrypted = cipher.doFinal(to_decrypt.getBytes());

return new String(decrypted);

} catch (Exception e) { return null; }

}

Decrypt Using Blowflish And Java

May 18, 2009 by blogmeister·0 Comments

In my previous post (Encrypt Using Blowflish And Java), I talked about a way to encrypt using Blowfish in Java. To decrypt it back to its original string, use this method below. Again, part of this method’s code uses a secondary method that converts hexadecimal to binary. You can find it here.

public static String decrypt(String key, String cipher) {
  Security.insertProviderAt(new org.bouncycastle.jce.provider.BouncyCastleProvider(), 3);
  String plain = null;
  byte[] cipherText = convertHexadecimal2Binary(cipher.getBytes());
  try {
    SecretKeySpec blowfishKey = new SecretKeySpec(key.getBytes(), "Blowfish");
    Cipher blowfishCipher = Cipher.getInstance("Blowfish", "BC");
    blowfishCipher.init(Cipher.DECRYPT_MODE, (Key)blowfishKey);
    byte[] plainText = blowfishCipher.doFinal(cipherText);
    plain = new String(plainText);
  } catch (Exception e) {
    e.printStackTrace();
  }
  return plain;
}

public static String decrypt(String key, String cipher) {

Security.insertProviderAt(new org.bouncycastle.jce.provider.BouncyCastleProvider(), 3);

String plain = null;

byte[] cipherText = convertHexadecimal2Binary(cipher.getBytes());

try {

SecretKeySpec blowfishKey = new SecretKeySpec(key.getBytes(), "Blowfish");

Cipher blowfishCipher = Cipher.getInstance("Blowfish", "BC");

blowfishCipher.init(Cipher.DECRYPT_MODE, (Key)blowfishKey);

byte[] plainText = blowfishCipher.doFinal(cipherText);

plain = new String(plainText);

} catch (Exception e) {

e.printStackTrace();

}

return plain;

}

Encrypt Using Blowflish And Java

May 18, 2009 by blogmeister·1 Comment

Blowfish is a symmetric block cipher that can be used as a drop-in replacement for DES or IDEA. It takes a variable-length key, from 32 bits to 448 bits, making it an ideal way for encryption purposes. Java supports Blowflish encryption in its API. Here is a method that will encrypt using Blowfish. Part of the code converts the string to be encrypted to byte[] array so this method uses a secondary method called convertBinary2Hexadecimal() which you can find here.

public static String encrypt(String key, String plain) {
  Security.insertProviderAt(new org.bouncycastle.jce.provider.BouncyCastleProvider(), 3);
  byte[] plainText = plain.getBytes();
  String cipher = null;
  try {
    SecretKeySpec blowfishKey = new SecretKeySpec(key.getBytes(), "Blowfish");
    Cipher blowfishCipher = Cipher.getInstance("Blowfish", "BC");
    blowfishCipher.init(Cipher.ENCRYPT_MODE, (Key)blowfishKey);
    byte[] cipherText = blowfishCipher.doFinal(plainText);
    cipher = convertBinary2Hexadecimal(cipherText);
  } catch (Exception e) {
    e.printStackTrace();
  }
  return cipher;
}

public static String encrypt(String key, String plain) {

Security.insertProviderAt(new org.bouncycastle.jce.provider.BouncyCastleProvider(), 3);

byte[] plainText = plain.getBytes();

String cipher = null;

try {

SecretKeySpec blowfishKey = new SecretKeySpec(key.getBytes(), "Blowfish");

Cipher blowfishCipher = Cipher.getInstance("Blowfish", "BC");

blowfishCipher.init(Cipher.ENCRYPT_MODE, (Key)blowfishKey);

byte[] cipherText = blowfishCipher.doFinal(plainText);

cipher = convertBinary2Hexadecimal(cipherText);

} catch (Exception e) {

e.printStackTrace();

}

return cipher;

}

Tech Tips & Tricks

tech tips gadgets programming software

Tag: blowfish

Encrypt And Decrypt Using Blowfish In Java

Decrypt Using Blowflish And Java

Encrypt Using Blowflish And Java