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/*
* HKDF
* (C) 2013 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_HKDF_H__
#define BOTAN_HKDF_H__
#include <botan/mac.h>
#include <botan/hash.h>
namespace Botan {
/**
* HKDF, see @rfc 5869 for details
*/
class BOTAN_DLL HKDF
{
public:
HKDF(MessageAuthenticationCode* extractor,
MessageAuthenticationCode* prf) :
m_extractor(extractor), m_prf(prf) {}
HKDF(MessageAuthenticationCode* prf) :
m_extractor(prf), m_prf(m_extractor->clone()) {}
void start_extract(const byte salt[], size_t salt_len);
void extract(const byte input[], size_t input_len);
void finish_extract();
/**
* Only call after extract
* @param output_len must be less than 256*hashlen
*/
void expand(byte output[], size_t output_len,
const byte info[], size_t info_len);
std::string name() const;
void clear();
private:
std::unique_ptr<MessageAuthenticationCode> m_extractor;
std::unique_ptr<MessageAuthenticationCode> m_prf;
};
}
#endif
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