sm2.h

Go to the documentation of this file.

/*
* SM2
* (C) 2017 Ribose Inc
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
 
#ifndef BOTAN_SM2_KEY_H_
#define BOTAN_SM2_KEY_H_
 
#include <botan/bigint.h>
#include <botan/ec_scalar.h>
#include <botan/ecc_key.h>
 
namespace Botan {
 
/**
* This class represents SM2 public keys
*/
class BOTAN_PUBLIC_API(2, 2) SM2_PublicKey : public virtual EC_PublicKey {
   public:
      /**
      * Create 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
      */
      SM2_PublicKey(const EC_Group& group, const EC_AffinePoint& public_key) : EC_PublicKey(group, public_key) {}
 
#if defined(BOTAN_HAS_LEGACY_EC_POINT)
      /**
      * Create 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
      */
      SM2_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
      */
      SM2_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
      */
      std::string algo_name() const override;
 
      std::unique_ptr<Private_Key> generate_another(RandomNumberGenerator& rng) const final;
 
      bool supports_operation(PublicKeyOperation op) const override {
         return (op == PublicKeyOperation::Signature || op == PublicKeyOperation::Encryption);
      }
 
      std::optional<size_t> _signature_element_size_for_DER_encoding() const override;
 
      std::unique_ptr<PK_Ops::Verification> create_verification_op(std::string_view params,
                                                                   std::string_view provider) const override;
 
      std::unique_ptr<PK_Ops::Encryption> create_encryption_op(RandomNumberGenerator& rng,
                                                               std::string_view params,
                                                               std::string_view provider) const override;
 
   protected:
      SM2_PublicKey() = default;
};
 
/**
* This class represents SM2 private keys
*/
 
BOTAN_DIAGNOSTIC_PUSH
BOTAN_DIAGNOSTIC_IGNORE_INHERITED_VIA_DOMINANCE
 
class BOTAN_PUBLIC_API(2, 2) SM2_PrivateKey final : public SM2_PublicKey,
                                                    public EC_PrivateKey {
   public:
      /**
      * Load a private key
      * @param alg_id the X.509 algorithm identifier
      * @param key_bits ECPrivateKey bits
      */
      SM2_PrivateKey(const AlgorithmIdentifier& alg_id, std::span<const uint8_t> key_bits);
 
      /**
      * 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
      */
      SM2_PrivateKey(const EC_Group& group, const EC_Scalar& x);
 
      /**
      * Create a new private key
      * @param rng a random number generator
      * @param group parameters to used for this key
      */
      SM2_PrivateKey(RandomNumberGenerator& rng, const EC_Group& group);
 
      /**
      * Create a 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")
      SM2_PrivateKey(RandomNumberGenerator& rng, const EC_Group& group, const BigInt& x);
 
      bool check_key(RandomNumberGenerator& rng, bool strong) const override;
 
      std::unique_ptr<Public_Key> public_key() const override;
 
      std::unique_ptr<PK_Ops::Signature> create_signature_op(RandomNumberGenerator& rng,
                                                             std::string_view params,
                                                             std::string_view provider) const override;
 
      std::unique_ptr<PK_Ops::Decryption> create_decryption_op(RandomNumberGenerator& rng,
                                                               std::string_view params,
                                                               std::string_view provider) const override;
 
      // TODO(Botan4) remove this and the member variable
      BOTAN_DEPRECATED("Deprecated no replacement") const BigInt& get_da_inv() const { return m_da_inv_legacy; }
 
      const EC_Scalar& _get_da_inv() const { return m_da_inv; }
 
   private:
      EC_Scalar m_da_inv;
      BigInt m_da_inv_legacy;
};
 
BOTAN_DIAGNOSTIC_POP
 
class HashFunction;
 
/*
* This is deprecated because it's not clear what it is useful for
*
* Open an issue on GH if you are using this
*/
BOTAN_DEPRECATED("Deprecated unclear usage")
std::vector<uint8_t> BOTAN_PUBLIC_API(3, 7)
   sm2_compute_za(HashFunction& hash, std::string_view user_id, const EC_Group& group, const EC_AffinePoint& pubkey);
 
#if defined(BOTAN_HAS_LEGACY_EC_POINT)
/*
* This is deprecated because it's not clear what it is useful for
*
* Open an issue on GH if you are using this
*/
BOTAN_DEPRECATED("Deprecated unclear usage")
inline std::vector<uint8_t> sm2_compute_za(HashFunction& hash,
                                           std::string_view user_id,
                                           const EC_Group& group,
                                           const EC_Point& pubkey);
#endif
 
// For compat with versions 2.2 - 2.7
typedef SM2_PublicKey SM2_Signature_PublicKey;
typedef SM2_PublicKey SM2_Encryption_PublicKey;
 
typedef SM2_PrivateKey SM2_Signature_PrivateKey;
typedef SM2_PrivateKey SM2_Encryption_PrivateKey;
 
}  // namespace Botan
 
#endif