sha256.h

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#pragma once
 
#include <openssl/evp.h>
 
#include <algorithm>
#include <filesystem>
#include <string>
 
namespace hgps {
 
std::string compute_sha256_for_file(const std::filesystem::path &file_path,
                                    size_t buffer_size = static_cast<size_t>(1024 * 1024));
 
class SHA256Context {
  public:
    SHA256Context();
    ~SHA256Context();
 
    template <class R> void update(const R &range) {
        if (const auto size = std::distance(std::begin(range), std::end(range))) {
            EVP_DigestUpdate(ctx_, &*std::begin(range), size);
        }
    }
 
    std::string finalise();
 
  private:
    EVP_MD_CTX *ctx_;
};
} // namespace hgps