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/*
* Crystals Kyber key encapsulation mechanism and key codec
*
* (C) 2024 Jack Lloyd
* (C) 2024 René Meusel, Rohde & Schwarz Cybersecurity
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_KYBER_R3_ENCAPSULATION_H_
#define BOTAN_KYBER_R3_ENCAPSULATION_H_
#include <botan/rng.h>
#include <botan/internal/kyber_encaps_base.h>
#include <botan/internal/kyber_keys.h>
namespace Botan {
class Kyber_KEM_Encryptor final : public Kyber_KEM_Encryptor_Base {
public:
Kyber_KEM_Encryptor(std::shared_ptr<const Kyber_PublicKeyInternal> key, std::string_view kdf) :
Kyber_KEM_Encryptor_Base(kdf, *key), m_public_key(std::move(key)) {}
protected:
void encapsulate(StrongSpan<KyberCompressedCiphertext> out_encapsulated_key,
StrongSpan<KyberSharedSecret> out_shared_key,
RandomNumberGenerator& rng) override;
const KyberConstants& mode() const override { return m_public_key->mode(); }
private:
std::shared_ptr<const Kyber_PublicKeyInternal> m_public_key;
};
class Kyber_KEM_Decryptor final : public Kyber_KEM_Decryptor_Base {
public:
Kyber_KEM_Decryptor(std::shared_ptr<const Kyber_PrivateKeyInternal> private_key,
std::shared_ptr<const Kyber_PublicKeyInternal> public_key,
std::string_view kdf) :
Kyber_KEM_Decryptor_Base(kdf, *public_key),
m_public_key(std::move(public_key)),
m_private_key(std::move(private_key)) {}
protected:
void decapsulate(StrongSpan<KyberSharedSecret> out_shared_key,
StrongSpan<const KyberCompressedCiphertext> encapsulated_key) override;
const KyberConstants& mode() const override { return m_private_key->mode(); }
private:
std::shared_ptr<const Kyber_PublicKeyInternal> m_public_key;
std::shared_ptr<const Kyber_PrivateKeyInternal> m_private_key;
};
} // namespace Botan
#endif