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/*
* Base class for message authentiction codes
* (C) 1999-2007 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#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 Buffered_Computation,
public SymmetricAlgorithm
{
public:
/**
* Create an instance based on a name
* If provider is empty then best available is chosen.
* @param algo_spec algorithm name
* @param provider provider implementation to use
* @return a null pointer if the algo/provider combination cannot be found
*/
static std::unique_ptr<MessageAuthenticationCode>
create(const std::string& algo_spec,
const std::string& provider = "");
/*
* Create an instance based on a name
* If provider is empty then best available is chosen.
* @param algo_spec algorithm name
* @param provider provider implementation to use
* Throws a Lookup_Error if algo/provider combination cannot be found
*/
static std::unique_ptr<MessageAuthenticationCode>
create_or_throw(const std::string& algo_spec,
const std::string& provider = "");
/**
* @return list of available providers for this algorithm, empty if not available
*/
static std::vector<std::string> providers(const std::string& algo_spec);
virtual ~MessageAuthenticationCode() {}
/**
* 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[], size_t length);
/**
* @return a new object representing the same algorithm as *this
*/
virtual MessageAuthenticationCode* clone() const = 0;
/**
* @return provider information about this implementation. Default is "base",
* might also return "sse2", "avx2", "openssl", or some other arbitrary string.
*/
virtual std::string provider() const { return "base"; }
};
typedef MessageAuthenticationCode MAC;
}
#endif
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