/*
    This file is part of TON Blockchain Library.

    TON Blockchain Library is free software: you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as published by
    the Free Software Foundation, either version 2 of the License, or
    (at your option) any later version.

    TON Blockchain Library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public License
    along with TON Blockchain Library.  If not, see <http://www.gnu.org/licenses/>.

    Copyright 2017-2020 Telegram Systems LLP
*/
#pragma once

#include "td/utils/common.h"
#include "td/utils/SharedSlice.h"
#include "td/utils/Status.h"

#if TD_HAVE_OPENSSL

namespace td {

class Ed25519 {
 public:
  class PublicKey {
   public:
    static constexpr size_t LENGTH = 32;

    explicit PublicKey(SecureString octet_string);

    SecureString as_octet_string() const;

    Status verify_signature(Slice data, Slice signature) const;

   private:
    SecureString octet_string_;
  };

  class PrivateKey {
   public:
    static constexpr size_t LENGTH = 32;

    explicit PrivateKey(SecureString octet_string);

    SecureString as_octet_string() const;

    Result<PublicKey> get_public_key() const;

    Result<SecureString> sign(Slice data) const;

    Result<SecureString> as_pem(Slice password) const;

    static Result<PrivateKey> from_pem(Slice pem, Slice password);

   private:
    SecureString octet_string_;
  };

  static Result<PrivateKey> generate_private_key();

  static Result<SecureString> compute_shared_secret(const PublicKey &public_key, const PrivateKey &private_key);

  static int version();
};

}  // namespace td

#endif