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/*
* Comb4P hash combiner
* (C) 2010 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#ifndef BOTAN_COMB4P_H__
#define BOTAN_COMB4P_H__
#include <botan/hash.h>
namespace Botan {
/**
* Combines two hash functions using a Feistel scheme. Described in
* "On the Security of Hash Function Combiners", Anja Lehmann
*/
class BOTAN_DLL Comb4P : public HashFunction
{
public:
/**
* @param h1 the first hash
* @param h2 the second hash
*/
Comb4P(HashFunction* h1, HashFunction* h2);
Comb4P(const Comb4P&) = delete;
Comb4P& operator=(const Comb4P&) = delete;
~Comb4P() { delete hash1; delete hash2; }
size_t hash_block_size() const;
size_t output_length() const
{
return hash1->output_length() + hash2->output_length();
}
HashFunction* clone() const
{
return new Comb4P(hash1->clone(), hash2->clone());
}
std::string name() const
{
return "Comb4P(" + hash1->name() + "," + hash2->name() + ")";
}
void clear();
private:
void add_data(const byte input[], size_t length);
void final_result(byte out[]);
HashFunction* hash1;
HashFunction* hash2;
};
}
#endif
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