/**
* Decrypts a String encrypted encrypted by the encrypt(String, Key) function.
*
* @param encryptedVersion The encrypted string
* @param keyData The byte[] representation of the Key used in encryption.
* @return The decrypted String.
* @throws EncryptionException
* @throws InvalidKeyException
* @throws NoSuchAlgorithmException
* @throws NoSuchPaddingException
* @throws IllegalBlockSizeException
* @throws BadPaddingException
* @throws IOException
*/
public static byte[] decrypt(byte[] encryptedVersion, Key salt) throws EncryptionException {
// Get a cipher object.
byte[] result = null;
Cipher cipher;
try {
cipher = Cipher.getInstance(EncryptionAlgorithm.DES.toString());
cipher.init(Cipher.DECRYPT_MODE, salt);
result = cipher.doFinal(encryptedVersion);
} catch (NoSuchAlgorithmException e) {
throw new EncryptionException(e);
} catch (NoSuchPaddingException e) {
throw new EncryptionException(e);
} catch (InvalidKeyException e) {
throw new EncryptionException(e);
} catch (IllegalBlockSizeException e) {
throw new EncryptionException(e);
} catch (BadPaddingException e) {
throw new EncryptionException(e);
}
return result;
}
public static byte[] encrypt(byte[] toEncrypt, byte[] rawSaltKey) throws EncryptionException {
byte[] result = null;
Key salt =
new SecretKeySpec(rawSaltKey, 0, rawSaltKey.length, EncryptionAlgorithm.DES.toString());
try {
Cipher cipher = Cipher.getInstance(EncryptionAlgorithm.DES.toString());
cipher.init(Cipher.ENCRYPT_MODE, salt);
result = cipher.doFinal(toEncrypt);
} catch (NoSuchAlgorithmException e) {
throw new EncryptionException(e);
} catch (InvalidKeyException e) {
throw new EncryptionException(e);
} catch (NoSuchPaddingException e) {
throw new EncryptionException(e);
} catch (IllegalBlockSizeException e) {
throw new EncryptionException(e);
} catch (BadPaddingException e) {
throw new EncryptionException(e);
}
return result;
}
/**
* Decrypts a String encrypted encrypted by the encrypt(String, Key) function.
*
* @param encryptedVersion The encrypted string
* @param rawSaltKey The byte[] representation of the Key used in encryption.
* @return The decrypted String.
* @throws EncryptionException
* @throws InvalidKeyException
* @throws NoSuchAlgorithmException
* @throws NoSuchPaddingException
* @throws IllegalBlockSizeException
* @throws BadPaddingException
* @throws IOException
*/
public static byte[] decrypt(byte[] encryptedVersion, byte[] rawSaltKey)
throws EncryptionException {
// Get a cipher object.
byte[] result = null;
Key salt =
new SecretKeySpec(rawSaltKey, 0, rawSaltKey.length, EncryptionAlgorithm.DES.toString());
Cipher cipher;
// decode the BASE64 coded message
// BASE64Decoder decoder = new BASE64Decoder();
// byte[] raw = decoder.decodeBuffer(encrypted);
try {
cipher = Cipher.getInstance(EncryptionAlgorithm.DES.toString());
cipher.init(Cipher.DECRYPT_MODE, salt);
result = cipher.doFinal(encryptedVersion);
} catch (NoSuchAlgorithmException e) {
throw new EncryptionException(e);
} catch (NoSuchPaddingException e) {
throw new EncryptionException(e);
} catch (IllegalBlockSizeException e) {
throw new EncryptionException(e);
} catch (BadPaddingException e) {
throw new EncryptionException(e);
} catch (InvalidKeyException e) {
throw new EncryptionException(e);
}
// If you want to return a string
// String clear = new String(stringBytes, "UTF8");
// return clear;
return result;
}
public static byte[] decrypt(String encryptedString, String rawSaltKeyString)
throws EncryptionException {
byte[] result = null;
try {
byte[] rawSaltKey = decode(rawSaltKeyString);
byte[] encryptedVersion = decode(encryptedString);
Key salt =
new SecretKeySpec(rawSaltKey, 0, rawSaltKey.length, EncryptionAlgorithm.DES.toString());
result = decrypt(encryptedVersion, salt);
} catch (IOException e) {
throw new EncryptionException(e);
}
// If you want to return a string
// String clear = new String(stringBytes, "UTF8");
// return clear;
return result;
}
/**
* Generates a java.security.Key using the 'DES' algorithm.
*
* @return The newly generated Key.
* @throws NoSuchAlgorithmException
*/
public static Key generateKey() throws NoSuchAlgorithmException {
KeyGenerator generator;
generator = KeyGenerator.getInstance(EncryptionAlgorithm.DES.toString());
generator.init(new SecureRandom());
return generator.generateKey();
}