#include "common.hh"

#include "hash_method.hh"

#include <openssl/sha.h>

namespace {

class Sha256HashMethod : public HashMethod {
public:
  Sha256HashMethod() {
    SHA256_Init(&ctx_);
  }

  void update(void const* data, size_t count) override {
    SHA256_Update(&ctx_, data, count);
  }

  std::string finish() override {
    uint8_t out[SHA256_DIGEST_LENGTH];
    SHA256_Final(out, &ctx_);
    SHA256_Init(&ctx_);
    return to_string(out, sizeof(out));
  }

private:
  SHA256_CTX ctx_;
};

}  // namespace

std::unique_ptr<HashMethod> HashMethod::sha256() {
  return std::make_unique<Sha256HashMethod>();
}