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/*
* Comb4P hash combiner
* (C) 2010 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#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 final : public HashFunction
{
public:
/**
* @param h1 the first hash
* @param h2 the second hash
*/
Comb4P(HashFunction* h1, HashFunction* h2);
size_t hash_block_size() const override;
size_t output_length() const override
{
return m_hash1->output_length() + m_hash2->output_length();
}
HashFunction* clone() const override
{
return new Comb4P(m_hash1->clone(), m_hash2->clone());
}
std::unique_ptr<HashFunction> copy_state() const override;
std::string name() const override
{
return "Comb4P(" + m_hash1->name() + "," + m_hash2->name() + ")";
}
void clear() override;
private:
Comb4P() {}
void add_data(const uint8_t input[], size_t length) override;
void final_result(uint8_t out[]) override;
std::unique_ptr<HashFunction> m_hash1, m_hash2;
};
}
#endif
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