/*

* KDF2

* (C) 1999-2007 Jack Lloyd

*

* Botan is released under the Simplified BSD License (see license.txt)

*/

#ifndef BOTAN_KDF2_H_

#define BOTAN_KDF2_H_

#include <botan/hash.h>

#include <botan/kdf.h>

namespace Botan {

/**

* KDF2, from IEEE 1363

*/

class KDF2 final : public KDF {

   public:

      std::string name() const override;

      std::unique_ptr<KDF> new_object() const override;

      /**

      * @param hash the hash function to use

      */

      explicit KDF2(std::unique_ptr<HashFunction> hash) : m_hash(std::move(hash)) {}

   private:

      void perform_kdf(std::span<uint8_t> key,

                       std::span<const uint8_t> secret,

                       std::span<const uint8_t> salt,

                       std::span<const uint8_t> label) const override;

   private:

      std::unique_ptr<HashFunction> m_hash;

};

}  // namespace Botan

#endif