entropy.h

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// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the Apache 2.0 License.
#pragma once
 
#include "ccf/crypto/entropy.h"
#include "ccf/crypto/openssl/openssl_wrappers.h"
 
#include <functional>
#include <memory>
#include <openssl/rand.h>
#include <vector>
 
namespace ccf::crypto
{
  class Entropy_OpenSSL : public Entropy
  {
  private:
    static bool gen(uint64_t& v);
 
  public:
    Entropy_OpenSSL() = default;
 
    std::vector<uint8_t> random(size_t len) override
    {
      std::vector<uint8_t> data(len);
 
      if (RAND_bytes(data.data(), data.size()) != 1)
        throw std::logic_error("Couldn't create random data");
 
      return data;
    }
 
    uint64_t random64() override
    {
      uint64_t rnd;
 
      if (RAND_bytes((unsigned char*)&rnd, sizeof(uint64_t)) != 1)
      {
        throw std::logic_error("Couldn't create random data");
      }
 
      return rnd;
    }
 
    void random(unsigned char* data, size_t len) override
    {
      if (RAND_bytes(data, len) != 1)
      {
        throw std::logic_error("Couldn't create random data");
      }
    }
  };
}