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/*
* Base class for message authentiction codes
* (C) 1999-2007 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#ifndef BOTAN_MESSAGE_AUTH_CODE_BASE_H__
#define BOTAN_MESSAGE_AUTH_CODE_BASE_H__
#include <botan/buf_comp.h>
#include <botan/sym_algo.h>
#include <string>
namespace Botan {
/**
* This class represents Message Authentication Code (MAC) objects.
*/
class BOTAN_DLL MessageAuthenticationCode : public BufferedComputation,
public SymmetricAlgorithm
{
public:
/**
* Verify a MAC.
* @param in the MAC to verify as a byte array
* @param length the length of param in
* @return true if the MAC is valid, false otherwise
*/
virtual bool verify_mac(const byte in[], u32bit length);
/**
* Get a new object representing the same algorithm as *this
*/
virtual MessageAuthenticationCode* clone() const = 0;
/**
* Get the name of this algorithm.
* @return name of this algorithm
*/
virtual std::string name() const = 0;
/**
* Reset the internal state of this object.
*/
virtual void clear() = 0;
/**
* @param mac_len the output length of this MAC
* @param key_min the minimum key size
* @param key_max the maximum key size
* @param key_mod the modulo restriction on the key size
*/
MessageAuthenticationCode(u32bit mac_len,
u32bit key_min,
u32bit key_max = 0,
u32bit key_mod = 1) :
BufferedComputation(mac_len),
SymmetricAlgorithm(key_min, key_max, key_mod) {}
virtual ~MessageAuthenticationCode() {}
};
}
#endif
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