ecgdsa.h

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/*
* ECGDSA (BSI-TR-03111, version 2.0)
* (C) 2016 René Korthaus
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
 
#ifndef BOTAN_ECGDSA_KEY_H_
#define BOTAN_ECGDSA_KEY_H_
 
#include <botan/ecc_key.h>
 
namespace Botan {
 
/**
* This class represents ECGDSA public keys.
*/
class BOTAN_PUBLIC_API(2, 0) ECGDSA_PublicKey : public virtual EC_PublicKey {
   public:
      /**
      * Construct a public key from a given public point.
      * @param group the domain parameters associated with this key
      * @param public_key the public point defining this key
      */
      ECGDSA_PublicKey(const EC_Group& group, const EC_AffinePoint& public_key) : EC_PublicKey(group, public_key) {}
 
#if defined(BOTAN_HAS_LEGACY_EC_POINT)
      /**
      * Construct a public key from a given public point.
      * @param group the domain parameters associated with this key
      * @param public_point the public point defining this key
      */
      ECGDSA_PublicKey(const EC_Group& group, const EC_Point& public_point) : EC_PublicKey(group, public_point) {}
#endif
 
      /**
      * Load a public key.
      * @param alg_id the X.509 algorithm identifier
      * @param key_bits DER encoded public key bits
      */
      ECGDSA_PublicKey(const AlgorithmIdentifier& alg_id, std::span<const uint8_t> key_bits) :
            EC_PublicKey(alg_id, key_bits) {}
 
      /**
      * Get this keys algorithm name.
      * @result this keys algorithm name ("ECGDSA")
      */
      std::string algo_name() const override { return "ECGDSA"; }
 
      std::optional<size_t> _signature_element_size_for_DER_encoding() const override;
 
      std::unique_ptr<Private_Key> generate_another(RandomNumberGenerator& rng) const final;
 
      bool supports_operation(PublicKeyOperation op) const override { return (op == PublicKeyOperation::Signature); }
 
      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:
      ECGDSA_PublicKey() = default;
};
 
/**
* This class represents ECGDSA private keys.
*/
 
BOTAN_DIAGNOSTIC_PUSH
BOTAN_DIAGNOSTIC_IGNORE_INHERITED_VIA_DOMINANCE
 
class BOTAN_PUBLIC_API(2, 0) ECGDSA_PrivateKey final : public ECGDSA_PublicKey,
                                                       public EC_PrivateKey {
   public:
      /**
      * Load a private key.
      * @param alg_id the X.509 algorithm identifier
      * @param key_bits ECPrivateKey bits
      */
      ECGDSA_PrivateKey(const AlgorithmIdentifier& alg_id, std::span<const uint8_t> key_bits) :
            EC_PrivateKey(alg_id, key_bits, true) {}
 
      /**
      * Create a private key from a given secret @p x
      * @param group curve parameters to bu used for this key
      * @param x      the private key
      */
      ECGDSA_PrivateKey(const EC_Group& group, const EC_Scalar& x) : EC_PrivateKey(group, x, true) {}
 
      /**
      * Create a new private key
      * @param rng a random number generator
      * @param group parameters to used for this key
      */
      ECGDSA_PrivateKey(RandomNumberGenerator& rng, const EC_Group& group) : EC_PrivateKey(rng, group, true) {}
 
      /**
      * Generate a new private key.
      * @param rng a random number generator
      * @param group parameters to used for this key
      * @param x the private key (if zero, generate a new random key)
      */
      BOTAN_DEPRECATED("Use one of the other constructors")
      ECGDSA_PrivateKey(RandomNumberGenerator& rng, const EC_Group& group, const BigInt& x) :
            EC_PrivateKey(rng, group, x, true) {}
 
      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;
};
 
BOTAN_DIAGNOSTIC_POP
 
}  // namespace Botan
 
#endif