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/*
* Cipher Modes
* (C) 2013 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_CIPHER_MODE_H__
#define BOTAN_CIPHER_MODE_H__
#include <botan/transform.h>
#include <botan/stream_cipher.h>
namespace Botan {
/**
* Interface for cipher modes
*/
class BOTAN_DLL Cipher_Mode : public Keyed_Transform
{
public:
/**
* Returns true iff this mode provides authentication as well as
* confidentiality.
*/
virtual bool authenticated() const { return false; }
/**
* Return the size of the authentication tag used (in bytes)
*/
virtual size_t tag_size() const { return 0; }
};
/**
* The two possible directions for cipher filters, determining whether they
* actually perform encryption or decryption.
*/
enum Cipher_Dir { ENCRYPTION, DECRYPTION };
BOTAN_DLL Cipher_Mode* get_cipher_mode(const std::string& algo_spec, Cipher_Dir direction);
}
#endif
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