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/*
* Ed448 Signature Algorithm (RFC 8032)
* (C) 2024 Jack Lloyd
* 2024 Fabian Albert - Rohde & Schwarz Cybersecurity
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_ED448_H_
#define BOTAN_ED448_H_
#include <botan/pk_keys.h>
#include <array>
namespace Botan {
/**
* @brief A public key for Ed448/Ed448ph according to RFC 8032.
*
* By default, Ed448 without prehash is used (recommended). To use
* Ed448ph, "Ed448ph" or a custom hash function identifier is passed
* as a parameter to the create_verification_op method.
*
* Note that contexts (i.e. Ed448ctx) are not supported by this interface.
*/
class BOTAN_PUBLIC_API(3, 4) Ed448_PublicKey : public virtual Public_Key {
public:
std::string algo_name() const override { return "Ed448"; }
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> raw_public_key_bits() const override;
std::vector<uint8_t> public_key_bits() const override;
std::unique_ptr<Private_Key> generate_another(RandomNumberGenerator& rng) const final;
bool supports_operation(PublicKeyOperation op) const override { return (op == PublicKeyOperation::Signature); }
/**
* Create a Ed448 Public Key.
* @param alg_id the X.509 algorithm identifier
* @param key_bits DER encoded public key bits
*/
Ed448_PublicKey(const AlgorithmIdentifier& alg_id, std::span<const uint8_t> key_bits);
/**
* Create a Ed448 Public Key from bytes (57 Bytes).
*/
Ed448_PublicKey(std::span<const uint8_t> key_bits);
std::unique_ptr<PK_Ops::Verification> create_verification_op(std::string_view params,
std::string_view provider) const override;
std::unique_ptr<PK_Ops::Verification> create_x509_verification_op(const AlgorithmIdentifier& signature_algorithm,
std::string_view provider) const override;
protected:
Ed448_PublicKey() = default;
std::array<uint8_t, 57> m_public;
};
BOTAN_DIAGNOSTIC_PUSH
BOTAN_DIAGNOSTIC_IGNORE_INHERITED_VIA_DOMINANCE
/**
* @brief A private key for Ed448/Ed448ph according to RFC 8032.
*
* By default, Ed448 without prehash is used (recommended). To use
* Ed448ph, "Ed448ph" or a custom hash function identifier is passed
* as a parameter to the create_verification_op method.
*
* Note that contexts (i.e. Ed448ctx) are not supported by this interface.
*/
class BOTAN_PUBLIC_API(3, 4) Ed448_PrivateKey final : public Ed448_PublicKey,
public virtual Private_Key {
public:
/**
* Construct a private key from the specified parameters.
*
* @param alg_id the X.509 algorithm identifier
* @param key_bits PKCS #8 structure
*/
Ed448_PrivateKey(const AlgorithmIdentifier& alg_id, std::span<const uint8_t> key_bits);
/**
* Construct a private key from bytes.
*
* @param key_bits private key bytes (57 Bytes)
*/
Ed448_PrivateKey(std::span<const uint8_t> key_bits);
/**
* Generate a new private key.
*
* @param rng the RNG to use
*/
explicit Ed448_PrivateKey(RandomNumberGenerator& rng);
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::Signature> create_signature_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