x448.h

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/*
* X448
* (C) 2024 Jack Lloyd
*     2024 Fabian Albert - Rohde & Schwarz Cybersecurity
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_X448_H_
#define BOTAN_X448_H_
 
#include <botan/pk_keys.h>
 
#include <array>
 
namespace Botan {
/**
 * @brief A public key for the X448 key agreement scheme according to RFC 7748.
 */
class BOTAN_PUBLIC_API(3, 4) X448_PublicKey : public virtual Public_Key {
   public:
      /**
      * Create a Curve25519 Public Key.
      * @param alg_id the X.509 algorithm identifier
      * @param key_bits DER encoded public key bits
      */
      X448_PublicKey(const AlgorithmIdentifier& alg_id, std::span<const uint8_t> key_bits);
 
      /**
      * Create a X448 Public Key.
      * @param pub 56-byte raw public key
      */
      explicit X448_PublicKey(std::span<const uint8_t> pub);
 
      std::string algo_name() const override { return "X448"; }
 
      size_t estimated_strength() const override { return 224; }
 
      size_t key_length() const override { return 448; }
 
      bool check_key(RandomNumberGenerator& rng, bool strong) const override;
 
      AlgorithmIdentifier algorithm_identifier() const override;
 
      std::vector<uint8_t> public_value() const { return {m_public.begin(), m_public.end()}; }
 
      std::vector<uint8_t> public_key_bits() const override;
 
      bool supports_operation(PublicKeyOperation op) const override { return (op == PublicKeyOperation::KeyAgreement); }
 
      std::unique_ptr<Private_Key> generate_another(RandomNumberGenerator& rng) const final;
 
   protected:
      X448_PublicKey() = default;
      std::array<uint8_t, 56> m_public;
};
 
BOTAN_DIAGNOSTIC_PUSH
BOTAN_DIAGNOSTIC_IGNORE_INHERITED_VIA_DOMINANCE
 
/**
 * @brief A private key for the X448 key agreement scheme according to RFC 7748.
 */
class BOTAN_PUBLIC_API(3, 4) X448_PrivateKey final : public X448_PublicKey,
                                                     public virtual Private_Key,
                                                     public virtual PK_Key_Agreement_Key {
   public:
      /**
      * Construct a private key from the specified parameters.
      * @param alg_id the X.509 algorithm identifier
      * @param key_bits PKCS #8 structure
      */
      X448_PrivateKey(const AlgorithmIdentifier& alg_id, std::span<const uint8_t> key_bits);
 
      /**
      * Generate a private key.
      * @param rng the RNG to use
      */
      explicit X448_PrivateKey(RandomNumberGenerator& rng);
 
      /**
      * Construct a private key from the specified parameters.
      * @param secret_key the private key
      */
      explicit X448_PrivateKey(std::span<const uint8_t> secret_key);
 
      std::vector<uint8_t> public_value() const override { return X448_PublicKey::public_key_bits(); }
 
      secure_vector<uint8_t> raw_private_key_bits() const override { return {m_private.begin(), m_private.end()}; }
 
      secure_vector<uint8_t> private_key_bits() const override;
 
      std::unique_ptr<Public_Key> public_key() const override;
 
      bool check_key(RandomNumberGenerator& rng, bool strong) const override;
 
      std::unique_ptr<PK_Ops::Key_Agreement> create_key_agreement_op(RandomNumberGenerator& rng,
                                                                     std::string_view params,
                                                                     std::string_view provider) const override;
 
   private:
      secure_vector<uint8_t> m_private;
};
 
BOTAN_DIAGNOSTIC_POP
 
}  // namespace Botan
 
#endif