hash_provider.h

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// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the Apache 2.0 License.
#pragma once
 
#include "ccf/crypto/hash_bytes.h"
#include "ccf/crypto/md_type.h"
#include "ccf/crypto/sha256_hash.h"
 
#include <array>
#include <cstdint>
#include <iostream>
#include <vector>
 
namespace ccf::crypto
{
  class HashProvider
  {
  public:
    virtual HashBytes Hash(
      const uint8_t* data, size_t size, MDType type) const = 0;
 
    virtual ~HashProvider() = default;
  };
 
  std::shared_ptr<HashProvider> make_hash_provider();
 
  // Incremental Hash Objects
  class ISha256Hash
  {
  public:
    ISha256Hash() {}
    virtual ~ISha256Hash() {}
 
    virtual void update_hash(std::span<const uint8_t> data) = 0;
    virtual Sha256Hash finalise() = 0;
 
    template <typename T>
    void update(const T& t)
    {
      update_hash({reinterpret_cast<const uint8_t*>(&t), sizeof(T)});
    }
 
    template <>
    void update(const std::vector<uint8_t>& d)
    {
      update_hash(d);
    }
  };
 
  std::shared_ptr<ISha256Hash> make_incremental_sha256();
}