private byte[] iv(byte[] encrypted) {
		return this.ivGenerator != NULL_IV_GENERATOR ? subArray(encrypted, 0,
				this.ivGenerator.getKeyLength()) : NULL_IV_GENERATOR.generateKey();
	}
private byte [ ] iv ( byte [ ] encrypted ) { return this . ivGenerator != NULL_IV_GENERATOR ? subArray ( encrypted , 0 , this . ivGenerator . getKeyLength ( ) ) : NULL_IV_GENERATOR . generateKey ( ) ; }
internal helpers