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/*
* KDF defined in NIST SP 800-56a revision 2 (Single-step key-derivation function)
*
* (C) 2017 Ribose Inc.
* Written by Krzysztof Kwiatkowski.
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_SP800_56A_H__
#define BOTAN_SP800_56A_H__
#include <botan/kdf.h>
namespace Botan {
/**
* NIST SP 800-56A KDF
*/
template<class AuxiliaryFunction_t>
class BOTAN_DLL SP800_56A final : public KDF
{
public:
std::string name() const override { return "SP800-56A(" + m_auxfunc->name() + ")"; }
KDF* clone() const override { return new SP800_56A(m_auxfunc->clone()); }
/**
* Derive a key using the SP800-56A KDF.
*
* The implementation hard codes the context value for the
* expansion step to the empty string.
*
* @param key derived keying material K_M
* @param key_len the desired output length in bytes
* @param secret shared secret Z
* @param secret_len size of Z in bytes
* @param salt salt used only if HMAC is used as a hash function
* @param salt_len not used by an algorithm
* @param label label for the expansion step
* @param label_len size of label in bytes
*
* @throws Invalid_Argument key_len > 2^32 or MAC is not a HMAC
*/
size_t kdf(uint8_t key[], size_t key_len,
const uint8_t secret[], size_t secret_len,
const uint8_t salt[], size_t salt_len,
const uint8_t label[], size_t label_len) const override;
/**
* @param auxfunc HASH or HMAC algorithm to be used as auxiliary function
*/
explicit SP800_56A(AuxiliaryFunction_t* auxfunc) : m_auxfunc(auxfunc) {}
private:
std::unique_ptr<AuxiliaryFunction_t> m_auxfunc;
};
}
#endif
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