////////////////////////////////////////////////////////////////////////////////
// Copyright 2019 Google LLC.
//
// This software is licensed under the terms defined in the Widevine Master
// License Agreement. For a copy of this agreement, please contact
// widevine-licensing@google.com.
////////////////////////////////////////////////////////////////////////////////
//
// Description:
//   Helper methods for the Root of Trust Id.

#include "common/rot_id_util.h"

#include <memory>

#include "glog/logging.h"
#include "absl/strings/str_cat.h"
#include "common/crypto_util.h"
#include "common/ec_key.h"
#include "common/sha_util.h"

namespace widevine {

std::string GenerateRotIdHash(const std::string& salt, uint32_t system_id,
                              const std::string& unique_id_hash) {
  if (salt.empty() || unique_id_hash.empty()) {
    return "";
  }
  return Sha256_Hash(absl::StrCat(salt, system_id, unique_id_hash));
}

std::string GenerateUniqueIdHash(const std::string& unique_id,
                                 const std::string& salt) {
  if (unique_id.empty()) {
    LOG(WARNING) << "unique_id should not be empty.";
    return "";
  }
  if (salt.empty()) {
    LOG(WARNING) << "salt should not be empty.";
    return "";
  }
  return widevine::Sha256_Hash(absl::StrCat(unique_id, salt));
}

}  // namespace widevine