encrypt | Tech Tips & Tricks

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;

}

Here are two methods to encrypt and decrypt using Base64. I forgot where I got this from but these 2 methods are pretty handy. Make sure you remember your key as your string will be encrypted and decrypted according to what you specify as key. Key is a string here.
Usage is as follows: $encrypted = encrypt("to encrypt string", "chitgoks"); $decrypted = decrypt($encrypted, "chitgoks");
$decrypted will return to encrypt string.
function encrypt($string, $key) { $result = ''; for($i=0; $i<strlen($string); $i++) { $char = substr($string, $i, 1); $keychar = substr($key, ($i % strlen($key))-1, 1); $char = chr(ord($char)+ord($keychar)); $result.=$char; }


  return base64_encode($result);
}
function decrypt($string, $key) {
  $result = '';
  $string = base64_decode($string);
  for($i=0; $i<strlen($string); $i++) {
    $char = substr($string, $i, 1);
    $keychar = substr($key, ($i % strlen($key))-1, 1);
    $char = chr(ord($char)-ord($keychar));
    $result.=$char;
  }

return $result; }

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