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/*
* HKDF
* (C) 2013,2015 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>
#include <botan/kdf.h>
namespace Botan {
/**
* HKDF, see RFC 5869 for details.
* This is only the expansion portion of HKDF.
* An appropriate extraction function should be used before.
*/
class BOTAN_DLL HKDF final : public KDF
{
public:
/**
* @param prf MAC algorithm to use
*/
explicit HKDF(MessageAuthenticationCode* prf) : m_prf(prf) {}
static HKDF* make(const Spec& spec);
KDF* clone() const override { return new HKDF(m_prf->clone()); }
std::string name() const override { return "HKDF(" + m_prf->name() + ")"; }
size_t kdf(byte out[], size_t out_len,
const byte secret[], size_t secret_len,
const byte salt[], size_t salt_len,
const byte label[], size_t label_len) const override;
private:
std::unique_ptr<MessageAuthenticationCode> m_prf;
};
}
#endif
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