curve.h

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// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the Apache 2.0 License.
#pragma once
 
#include "ccf/crypto/md_type.h"
#include "ccf/ds/enum_formatter.h"
#include "ccf/ds/json.h"
 
#define FMT_HEADER_ONLY
#include <fmt/format.h>
#include <stdexcept>
#include <string>
 
namespace ccf::crypto
{
  // SNIPPET_START: supported_curves
  enum class CurveID
  {
    NONE = 0,
    SECP384R1,
    SECP256R1,
    SECP256K1,
    CURVE25519,
    X25519
  };
 
  DECLARE_JSON_ENUM(
    CurveID,
    {{CurveID::NONE, "None"},
     {CurveID::SECP384R1, "Secp384R1"},
     {CurveID::SECP256R1, "Secp256R1"},
     {CurveID::SECP256K1, "Secp256K1"},
     {CurveID::CURVE25519, "Curve25519"},
     {CurveID::X25519, "X25519"}});
 
  static constexpr CurveID service_identity_curve_choice = CurveID::SECP384R1;
  // SNIPPET_END: supported_curves
 
  // Get message digest algorithm to use for given elliptic curve
  inline MDType get_md_for_ec(CurveID ec)
  {
    switch (ec)
    {
      case CurveID::SECP384R1:
        return MDType::SHA384;
      case CurveID::SECP256R1:
        return MDType::SHA256;
      case CurveID::SECP256K1:
        return MDType::SHA256;
      default:
      {
        throw std::logic_error(fmt::format("Unhandled CurveID: {}", ec));
      }
    }
  }
}