/**
* Create a buffered block cipher that uses Cipher Text Stealing
*
* @param cipher the underlying block cipher this buffering object wraps.
*/
public CTSBlockCipher(BlockCipher cipher) {
if ((cipher instanceof OFBBlockCipher)
|| (cipher instanceof CFBBlockCipher)
|| (cipher instanceof SICBlockCipher)) {
// TODO: This is broken - need to introduce marker interface to differentiate block cipher
// primitive from mode?
throw new IllegalArgumentException("CTSBlockCipher can only accept ECB, or CBC ciphers");
}
this.cipher = cipher;
blockSize = cipher.getBlockSize();
buf = new byte[blockSize * 2];
bufOff = 0;
}
/**
* Create a buffered block cipher with, or without, padding.
*
* @param cipher the underlying block cipher this buffering object wraps.
*/
public PaddedBlockCipher(BlockCipher cipher) {
this.cipher = cipher;
buf = new byte[cipher.getBlockSize()];
bufOff = 0;
}
public int getBlockSize() {
return cipher.getBlockSize();
}