I am trying to encode a simple String "test" back and forth.
public static String encode(Key publicKey, String data) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException {
byte[] byteData = data.getBytes(); // convert string to byte array
Cipher cipher = Cipher.getInstance(ALGORITHM); // create conversion processing object
cipher.init(Cipher.ENCRYPT_MODE, publicKey); // initialize object's mode and key
byte[] encryptedByteData = cipher.doFinal(byteData); // use object for encryption
return new String(encryptedByteData); // convert encrypted byte array to string and return it
}
public static String decode(Key privateKey, String data) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException {
byte[] byteData = data.getBytes(); // convert string to byte array
Cipher cipher = Cipher.getInstance(ALGORITHM); // create conversion processing object
cipher.init(Cipher.DECRYPT_MODE, privateKey); // initialize object's mode and key
System.out.println(byteData.length);
byte[] decryptedByteData = cipher.doFinal(byteData); // use object for decryption
return new String(decryptedByteData); // convert decrypted byte array to string and return it
}
However, although the encryption works just fine (ALGORITHM is "RSA"), when trying to decrypt the string I have just gotten from encrypting "test", I get following exception:
javax.crypto.IllegalBlockSizeException: Data must not be longer than 256 bytes
Should I split the encrypted bytes in chunks of 256 in order to be able to decrypt it?
