#include <iostream>
#include <fstream>

#include "EtsiTs103097Module.hh"

#include "certificates_loader.hh"

#include "etsi_ts103097_certificate_codec.hh"

#include "sha256.hh"
#include "sha384.hh"

#include "converter.hh"

#include "loggers.hh"

certificates_loader * certificates_loader::instance = nullptr;

certificates_loader::certificates_loader(): _certificateExt{".oer"}, _privateKeyExt{".vkey"}, _privateEncKeyExt{".ekey"}, _publicKeysExt{".vkey_pub"}, _publicCompKeysExt(".cvkey"), _publicEncKeysExt{".ekey_pub"}, _hashedidDigestExt{".hashedid"}, _issuerDigestExt{".issuer"}, _publicEncCompKeysExt{".cekey"}, _full_path(), _is_cache_initialized{false}, _directory_filter{".svn", "._.DS_Store", ".DS_Store"} {
  loggers::get_instance().log(">>> certificates_loader::certificates_loader");
} // End of ctor

int certificates_loader::build_path(const std::string& p_root_directory) {
  loggers::get_instance().log(">>> certificates_loader::build_path: '%s'", p_root_directory.c_str());

  // Build full path
  if (!p_root_directory.empty()) {
    _full_path = p_root_directory;
    if (!std::experimental::filesystem::exists(_full_path) || !std::experimental::filesystem::is_directory(_full_path)) { // FIXME Coredump when app hasn't the rights to create the directory!!!!
      // Create directory
      if (!std::experimental::filesystem::create_directory(_full_path)) {
        _full_path = "./";
      } else { // Set rights for all users
        std::experimental::filesystem::permissions(_full_path, std::experimental::filesystem::perms::add_perms | std::experimental::filesystem::perms::owner_all | std::experimental::filesystem::perms::group_all | std::experimental::filesystem::perms::others_all);
      }
    }
  } else {
    _full_path = "./";
  }
  std::experimental::filesystem::canonical(_full_path);
  loggers::get_instance().log("certificates_loader::build_path: full path: %s", _full_path.string().c_str());
  if (!std::experimental::filesystem::exists(_full_path)) {
    loggers::get_instance().warning("certificates_loader::build_path: Invalid path");
    _full_path.clear();
    return -1;
  }

  return 0;
} // End of method build_path

int certificates_loader::load_certificates(std::map<std::string, std::unique_ptr<security_db_record> >& p_certificates, std::map<std::vector<unsigned char>, std::string>& p_hashed_id8s) {
  loggers::get_instance().log(">>> certificates_loader::load_certificates");

  // Sanity check
  if (_is_cache_initialized) {
    return 0;
  }
  
  // Retrieve the list of the files in the path
  std::set<std::experimental::filesystem::path> files;
  if (retrieve_certificates_list(files) == -1) {
    loggers::get_instance().warning("certificates_loader::load_certificates: Failed to build the list of certificate files");
    return -1;
  }
  // Build the certificates cache
  if (build_certificates_cache(files, p_certificates, p_hashed_id8s) == -1) {
    loggers::get_instance().warning("certificates_loader::load_certificates: Failed to build the certificate cache");
    return -1;
  }
  
  _is_cache_initialized = true;
  
  return 0;
} // End of method load_certificates

int certificates_loader::retrieve_certificates_list(std::set<std::experimental::filesystem::path>& p_files) {
  loggers::get_instance().log(">>> certificates_loader::retrieve_certificates_list");

  // Walk through directories
  std::set<std::experimental::filesystem::path> folders;
  for (const std::experimental::filesystem::directory_entry it : std::experimental::filesystem::recursive_directory_iterator(_full_path.string())) {
    //loggers::get_instance().log("certificates_loader::retrieve_certificates_list: Processing directory '%s'", it.path().string().c_str());
    if (std::experimental::filesystem::is_directory(it)) {
      std::set<std::string>::const_iterator i = _directory_filter.find(it.path().filename());
      if (i != _directory_filter.cend()) {
        //loggers::get_instance().log("certificates_loader::retrieve_certificates_list: Exclude directory '%s'", it.path().string().c_str());
        continue;
      }
      //loggers::get_instance().log("certificates_loader::retrieve_certificates_list: Add directory '%s'", it.path().string().c_str());
      folders.insert(it.path());
    }
  } // End of 'for' statement

  if (folders.size() == 0) {
    loggers::get_instance().warning("certificates_loader::retrieve_certificates_list: No folder after filtering");
    folders.insert(_full_path);
  }
  // Process files
  p_files.clear();
  std::set<std::string> extensions_filter{ _certificateExt, _privateKeyExt, _privateEncKeyExt, _publicKeysExt, _publicCompKeysExt, _publicEncKeysExt, _hashedidDigestExt, _issuerDigestExt };
  for (std::set<std::experimental::filesystem::path>::const_reverse_iterator f = folders.crbegin(); f != folders.crend(); ++f) {
    //loggers::get_instance().log("certificates_loader::retrieve_certificates_list: Processing directory '%s'", f->string().c_str());
    for(const std::experimental::filesystem::directory_entry it : std::experimental::filesystem::recursive_directory_iterator(*f)) {
      //loggers::get_instance().log("certificates_loader::retrieve_certificates_list: Processing file '%s'", it.path().filename().string().c_str());
      if (std::experimental::filesystem::is_regular_file(it)) {
        //loggers::get_instance().log("certificates_loader::retrieve_certificates_list: Check extension '%s'", it.path().extension().string().c_str());
        std::set<std::string>::const_iterator i = extensions_filter.find(it.path().extension().string());
        if (i != extensions_filter.cend()) {
          //loggers::get_instance().log("certificates_loader::retrieve_certificates_list: Add file '%s'", it.path().filename().string().c_str());
          p_files.insert(it);
        }
      }
    } // End of 'for' statement
  } // End of 'for' statement
  loggers::get_instance().log("certificates_loader::retrieve_certificates_list: # of files to cache: %d", p_files.size());
  if (p_files.size() == 0) {
    loggers::get_instance().warning("certificates_loader::retrieve_certificates_list: No certificate found");
    return -1;
  }
  
  return 0;
} // End of method retrieve_certificates_list

int certificates_loader::build_certificates_cache(std::set<std::experimental::filesystem::path>& p_files, std::map<std::string, std::unique_ptr<security_db_record> >& p_certificates, std::map<std::vector<unsigned char>, std::string>& p_hashed_id8s) {
  loggers::get_instance().log(">>> certificates_loader::build_certificates_cache");

  std::set<std::experimental::filesystem::path>::const_iterator it = p_files.cbegin();
  std::pair<std::map<std::string, std::unique_ptr<security_db_record> >::iterator, bool> result;
  do {
    loggers::get_instance().log("certificates_loader::build_certificates_cache: Caching '%s'", it->string().c_str());
    std::experimental::filesystem::path p = *it;
    const std::string& key = p.stem();
    loggers::get_instance().log("certificates_loader::build_certificates_cache: Key = '%s'", key.c_str());

    if(p_certificates.find(key) != p_certificates.cend()) {
      p_files.erase(it);
      it = p_files.cbegin();
      continue;
    }
    
    // Load certificate file
    it = p_files.find(p.replace_extension(_certificateExt));
    if (it == p_files.cend()) {
      loggers::get_instance().warning("certificates_loader::build_certificates_cache: Certificate file not found for '%s'", key.c_str());
      return -1;
    }
    loggers::get_instance().log("certificates_loader::build_certificates_cache: Caching certificate '%s'", it->string().c_str());
    std::ifstream is(it->string(), ios::in | ios::binary);
    std::vector<unsigned char> certificate(std::experimental::filesystem::file_size(*it), 0x00);
    is.read(reinterpret_cast<char *>(certificate.data()), certificate.size());
    is.close();
    // Remove items from the list
    p_files.erase(it);

    // Load private key file
    it = p_files.find(p.replace_extension(_privateKeyExt));
    if (it == p_files.cend()) {
      loggers::get_instance().warning("certificates_loader::build_certificates_cache: Private keys file not found for '%s'", key.c_str());
      return -1;
    }
    loggers::get_instance().log("certificates_loader::build_certificates_cache: Caching private keys '%s'", it->string().c_str());
    is.open(it->string(), ios::in | ios::binary);
    int size = std::experimental::filesystem::file_size(*it);
    if ((size != 32) && (size != 48)) {
      loggers::get_instance().warning("certificates_loader::build_certificates_cache: Private key size is incorrect for '%s'", key.c_str());
      return -1;
    }
    std::vector<unsigned char> private_key(size, 0x00);
    is.read(reinterpret_cast<char *>(private_key.data()), private_key.size());
    is.close();
    // Remove items from the list
    p_files.erase(it);
    
    // Load private encryption key file if present
    std::vector<unsigned char> private_enc_key;
    it = p_files.find(p.replace_extension(_privateEncKeyExt));
    if (it != p_files.cend()) {
      loggers::get_instance().log("certificates_loader::build_certificates_cache: Caching private encryption keys '%s'", it->string().c_str());
      is.open(it->string(), ios::in | ios::binary);
      int size = std::experimental::filesystem::file_size(*it);
      if (size != 32) { // IEEE Std 1609.2 2017: NistP256 or BrainpoolP256r1
        loggers::get_instance().warning("certificates_loader::build_certificates_cache: Private encryption key size is incorrect for '%s'", key.c_str());
        return -1;
      }
      private_enc_key.resize(size, 0x00);
      is.read(reinterpret_cast<char *>(private_enc_key.data()), private_enc_key.size());
      is.close();
      // Remove items from the list
      p_files.erase(it);
    }
    
    // Load public keys file
    it = p_files.find(p.replace_extension(_publicKeysExt));
    if (it == p_files.cend()) {
      loggers::get_instance().warning("certificates_loader::build_certificates_cache: Public keys file not found for '%s'", key.c_str());
      // Try with only binary format of the certificate and the private key
      etsi_ts103097_certificate_codec codec;
      IEEE1609dot2::CertificateBase decoded_certificate;
      OCTETSTRING os(certificate.size(), certificate.data());
      codec.decode(os, decoded_certificate);
      if (!decoded_certificate.is_value()) {
        loggers::get_instance().warning("certificates_loader::build_certificates_cache: Failed to decode certificate for '%s'", key.c_str());
        return -1;
      } else {
        loggers::get_instance().log_msg("certificates_loader::build_certificates_cache: Decoded certificate: ", decoded_certificate);
        // Prepare all fields
        if (!decoded_certificate.toBeSigned().verifyKeyIndicator().ischosen(IEEE1609dot2::VerificationKeyIndicator::ALT_verificationKey)) {
          loggers::get_instance().warning("certificates_loader::build_certificates_cache: Wrong VerificationKeyIndicator variant for '%s'", key.c_str());
          return -1;
        }
        std::vector<unsigned char> public_key_x;
        std::vector<unsigned char> public_key_y;
        std::vector<unsigned char> public_comp_key; // public compressed key, 33 or 49 bytes length, byte #0 indicating compressed-y-0 (0x02) or compressed-y-1 (0x03)
        IEEE1609dot2BaseTypes::PublicVerificationKey& b = decoded_certificate.toBeSigned().verifyKeyIndicator().verificationKey();
        if (b.ischosen(IEEE1609dot2BaseTypes::PublicVerificationKey::ALT_ecdsaNistP256)) {
          IEEE1609dot2BaseTypes::EccP256CurvePoint& p = b.ecdsaNistP256();
          fill_public_key_vectors(p, public_comp_key, public_key_x, public_key_y);
        } else if (b.ischosen(IEEE1609dot2BaseTypes::PublicVerificationKey::ALT_ecdsaBrainpoolP256r1)) {
          IEEE1609dot2BaseTypes::EccP256CurvePoint& p = b.ecdsaBrainpoolP256r1();
          fill_public_key_vectors(p, public_comp_key, public_key_x, public_key_y);
        } else { // ALT_ecdsaBrainpoolP384r1
          IEEE1609dot2BaseTypes::EccP384CurvePoint& p = b.ecdsaBrainpoolP384r1();
          fill_public_key_vectors(p, public_comp_key, public_key_x, public_key_y);
        }
        loggers::get_instance().log_to_hexa("certificates_loader::build_certificates_cache: public_key_x: ", public_key_x.data(), public_key_x.size());
        loggers::get_instance().log_to_hexa("certificates_loader::build_certificates_cache: public_key_y: ", public_key_y.data(), public_key_y.size());
        loggers::get_instance().log_to_hexa("certificates_loader::build_certificates_cache: public_comp_key: ", public_comp_key.data(), public_comp_key.size());
        
        std::vector<unsigned char> public_enc_key_x;
        std::vector<unsigned char> public_enc_key_y;
        std::vector<unsigned char> public_enc_comp_key;
        if (decoded_certificate.toBeSigned().encryptionKey().ispresent()) {
          IEEE1609dot2BaseTypes::PublicEncryptionKey& v = static_cast<IEEE1609dot2BaseTypes::PublicEncryptionKey&>(decoded_certificate.toBeSigned().encryptionKey());
          IEEE1609dot2BaseTypes::BasePublicEncryptionKey& b = v.publicKey();
          if (b.ischosen(IEEE1609dot2BaseTypes::BasePublicEncryptionKey::ALT_eciesNistP256)) {
            IEEE1609dot2BaseTypes::EccP256CurvePoint& p = v.publicKey().eciesNistP256();
            fill_public_key_vectors(p, public_enc_comp_key, public_enc_key_x, public_enc_key_y);
          } else if (b.ischosen(IEEE1609dot2BaseTypes::BasePublicEncryptionKey::ALT_eciesBrainpoolP256r1)) {
            IEEE1609dot2BaseTypes::EccP256CurvePoint& p = v.publicKey().eciesBrainpoolP256r1();
            fill_public_key_vectors(p, public_enc_comp_key, public_enc_key_x, public_enc_key_y);
          }
        }
        
        std::vector<unsigned char> hashed_id;
        std::vector<unsigned char> issuer;
        if (decoded_certificate.issuer().ischosen(IEEE1609dot2::IssuerIdentifier::ALT_sha256AndDigest)) {
          std::vector<unsigned char> hash;
          sha256 sha;
          sha.generate(certificate, hash);
          loggers::get_instance().log_to_hexa("certificates_loader::build_certificates_cache: Whole-certificate SHA-256 hash: ", hash.data(), hash.size());
          hashed_id.insert(hashed_id.begin(), hash.cend() - 8, hash.cend());
          issuer.assign(
                        static_cast<const unsigned char*>(decoded_certificate.issuer().sha256AndDigest()),
                        decoded_certificate.issuer().sha256AndDigest().lengthof() + static_cast<const unsigned char*>(decoded_certificate.issuer().sha256AndDigest())
                        );
        } else if (decoded_certificate.issuer().ischosen(IEEE1609dot2::IssuerIdentifier::ALT_sha384AndDigest)) {
          std::vector<unsigned char> hash;
          sha384 sha;
          sha.generate(certificate, hash);
          loggers::get_instance().log_to_hexa("certificates_loader::build_certificates_cache: Whole-certificate SHA-384 hash: ", hash.data(), hash.size());
          hashed_id.insert(hashed_id.begin(), hash.cend() - 8, hash.cend());
          issuer.assign(
                        static_cast<const unsigned char*>(decoded_certificate.issuer().sha384AndDigest()),
                        decoded_certificate.issuer().sha384AndDigest().lengthof() + static_cast<const unsigned char*>(decoded_certificate.issuer().sha384AndDigest())
                        );
        } else {
          hashed_id.resize(8);
          issuer.resize(8);
        }
        loggers::get_instance().log_to_hexa("certificates_loader::build_certificates_cache: hashed_id: ", hashed_id.data(), hashed_id.size());
        loggers::get_instance().log_to_hexa("certificates_loader::build_certificates_cache: issuer: ", issuer.data(), issuer.size());
        
        // Create new record
        security_db_record* p = new security_db_record(
                                                       key,
                                                       certificate, // Certificate
                                                       decoded_certificate,
                                                       issuer, // Hashed ID fo the issuer
                                                       hashed_id, // Hashed ID
                                                       private_key, // Private key
                                                       public_key_x, // public keys X-coordinate
                                                       public_key_y, // public keys Y-coordinate
                                                       public_comp_key, // public compressed key, 33 or 49 bytes length, byte #0 indicating compressed-y-0 (0x02) or compressed-y-1 (0x03)
                                                       private_enc_key, // Private enciption key
                                                       public_enc_key_x, // Public enciption key X-coordinate
                                                       public_enc_key_y, // Public enciption key Y-coordinate
                                                       public_enc_comp_key // Public compressed enciption key
                                                       );
        result = p_certificates.insert(std::pair<const std::string, std::unique_ptr<security_db_record> >(key, std::unique_ptr<security_db_record>(p)));
        if (result.second == false) {
          loggers::get_instance().warning("certificates_loader::build_certificates_cache: Failed to insert new record '%s'", key.c_str());
          delete p;
          return -1;
        }
        p_hashed_id8s.insert(std::pair<std::vector<unsigned char>, std::string>(result.first->second.get()->hashed_id(), result.first->first));
        
        // Reset pointer
        it = p_files.cbegin();
        // Continue with next certificte in the list
        continue;
      }
    } // else, continue with detailed files
    loggers::get_instance().log("certificates_loader::build_certificates_cache: Caching public keys '%s'", it->string().c_str());
    is.open(it->string(), ios::in | ios::binary);
    size = std::experimental::filesystem::file_size(*it);
    if ((size != 64) && (size != 96)) {
      loggers::get_instance().warning("certificates_loader::build_certificates_cache: Public keys size is incorrect for '%s'", key.c_str());
      return -1;
    }
    std::vector<unsigned char> public_key_x(size / 2, 0x00);
    is.read(reinterpret_cast<char *>(public_key_x.data()), public_key_x.size());
    std::vector<unsigned char> public_key_y(size / 2, 0x00);
    is.read(reinterpret_cast<char *>(public_key_y.data()), public_key_y.size());
    is.close();
    // Remove items from the list
    p_files.erase(it);

    // Load public compressed key file
    it = p_files.find(p.replace_extension(_publicCompKeysExt));
    if (it == p_files.cend()) {
      loggers::get_instance().warning("certificates_loader::build_certificates_cache: Public compress key file not found for '%s'", key.c_str());
      return -1;
    }
    loggers::get_instance().log("certificates_loader::build_certificates_cache: Caching public compressed ke '%s'", it->string().c_str());
    is.open(it->string(), ios::in | ios::binary);
    size = std::experimental::filesystem::file_size(*it);
    if ((size != 33) && (size != 49)) {
      loggers::get_instance().warning("certificates_loader::build_certificates_cache: Public compressed key size is incorrect for '%s'", key.c_str());
      return -1;
    }
    std::vector<unsigned char> public_comp_key(size, 0x00);
    is.read(reinterpret_cast<char *>(public_comp_key.data()), public_comp_key.size());
    is.close();
    // Remove items from the list
    p_files.erase(it);

    // Load public encryption key file
    std::vector<unsigned char> public_enc_key_x;
    std::vector<unsigned char> public_enc_key_y;
    it = p_files.find(p.replace_extension(_publicEncKeysExt));
    if (it != p_files.cend()) {
      loggers::get_instance().log("certificates_loader::build_certificates_cache: Caching public encryption keys '%s'", it->string().c_str());
      is.open(it->string(), ios::in | ios::binary);
      size = std::experimental::filesystem::file_size(*it);
      if (size != 64) { // IEEE Std 1609.2 2017: NistP256 or BrainpoolP256r1
        loggers::get_instance().warning("certificates_loader::build_certificates_cache: Public encryption keys size is incorrect for '%s'", key.c_str());
        return -1;
      }
      public_enc_key_x.resize(size / 2, 0x00);
      is.read(reinterpret_cast<char *>(public_enc_key_x.data()), public_enc_key_x.size());
      public_enc_key_y.resize(size / 2, 0x00);
      is.read(reinterpret_cast<char *>(public_enc_key_y.data()), public_enc_key_y.size());
      is.close();
      // Remove items from the list
      p_files.erase(it);
    }
    
    std::vector<unsigned char> public_enc_comp_key;
    it = p_files.find(p.replace_extension(_publicEncCompKeysExt));
    if (it != p_files.cend()) {
      loggers::get_instance().log("certificates_loader::build_certificates_cache: Caching public compressed encryption keys '%s'", it->string().c_str());
      is.open(it->string(), ios::in | ios::binary);
      size = std::experimental::filesystem::file_size(*it);
      if (size != 33) { // IEEE Std 1609.2 2017: NistP256 or BrainpoolP256r1
        loggers::get_instance().warning("certificates_loader::build_certificates_cache: Public compressed encryption keys size is incorrect for '%s'", key.c_str());
        return -1;
      }
      public_enc_comp_key.resize(33, 0x00);
      is.read(reinterpret_cast<char *>(public_enc_comp_key.data()), public_enc_comp_key.size());
      is.close();
      // Remove items from the list
      p_files.erase(it);
    }
    
    // Load issuer
    it = p_files.find(p.replace_extension(_issuerDigestExt));
    if (it == p_files.cend()) {
      loggers::get_instance().warning("certificates_loader::build_certificates_cache: Issuer keys file not found for '%s'", key.c_str());
      return -1;
    }
    loggers::get_instance().log("certificates_loader::build_certificates_cache: Caching issuer keys '%s'", it->string().c_str());
    is.open(it->string(), ios::in | ios::binary);
    size = std::experimental::filesystem::file_size(*it);
    if (size != 8) {
      loggers::get_instance().warning("certificates_loader::build_certificates_cache: Issuer keys file not found for '%s'", key.c_str());
      return -1;
    }
    std::vector<unsigned char> issuer(size, 0x00);
    is.read(reinterpret_cast<char *>(issuer.data()), issuer.size());
    is.close();
    // Remove items from the list
    p_files.erase(it);

    // Load hashed_id
    it = p_files.find(p.replace_extension(_hashedidDigestExt));
    if (it == p_files.cend()) {
      loggers::get_instance().warning("certificates_loader::build_certificates_cache: Hashed_Id keys file not found for '%s'", key.c_str());
      return -1;
    }
    loggers::get_instance().log("certificates_loader::build_certificates_cache: Caching hashed_id keys '%s'", it->string().c_str());
    is.open(it->string(), ios::in | ios::binary);
    size = std::experimental::filesystem::file_size(*it);
    if (size != 8) {
      loggers::get_instance().warning("certificates_loader::build_certificates_cache: Hashed_Id keys file not found for '%s'", key.c_str());
      return -1;
    }
    std::vector<unsigned char> hashed_id(size, 0x00);
    is.read(reinterpret_cast<char *>(hashed_id.data()), hashed_id.size());
    is.close();
    // Remove items from the list
    p_files.erase(it);

    // Create new record
    etsi_ts103097_certificate_codec codec;
    IEEE1609dot2::CertificateBase decoded_certificate;
    OCTETSTRING os(certificate.size(), certificate.data());
    codec.decode(os, decoded_certificate);
    loggers::get_instance().log_msg("certificates_loader::build_certificates_cache: Decoded certificate: ", decoded_certificate);
    p_certificates.insert(std::pair<const std::string, std::unique_ptr<security_db_record> >(key, std::unique_ptr<security_db_record>(
                                                                                                                                      new security_db_record(
                                                                                                                                                             key,
                                                                                                                                                             certificate, // Certificate
                                                                                                                                                             decoded_certificate,
                                                                                                                                                             issuer, // Hashed ID fo the issuer
                                                                                                                                                             hashed_id, // Hashed ID
                                                                                                                                                             private_key, // Private key
                                                                                                                                                             public_key_x, // public keys X-coordinate
                                                                                                                                                             public_key_y, // public keys Y-coordinate
                                                                                                                                                             public_comp_key, // public compressed key, 33 or 49 bytes length, byte #0 indicating compressed-y-0 (0x02) or compressed-y-1 (0x03)
                                                                                                                                                             private_enc_key, // Private enciption key
                                                                                                                                                             public_enc_key_x, // Public enciption key X-coordinate
                                                                                                                                                             public_enc_key_y, // Public enciption key Y-coordinate
                                                                                                                                                             public_enc_comp_key // Public compressed enciption key
                                                                                                                                                             ))
                                                                                             ));
    std::map<std::string, std::unique_ptr<security_db_record> >::const_iterator i = p_certificates.find(key);
    if (i == p_certificates.cend()) {
      loggers::get_instance().warning("certificates_loader::build_certificates_cache: Failed to insert new record '%s'", key.c_str());
      return -1;
    }
    p_hashed_id8s.insert(std::pair<std::vector<unsigned char>, std::string>(i->second.get()->hashed_id(), i->first));
    
    // Reset pointer
    it = p_files.cbegin();
  } while (it != p_files.cend());
  
  return 0;
} // End of method build_certificates_cache

int certificates_loader::save_certificate(const security_db_record& p_certificate) {
  loggers::get_instance().log(">>> certificates_loader::save_certificate");

  // Certificate file
  std::experimental::filesystem::path p(_full_path);
  p /= p_certificate.certificate_id();
  p += _certificateExt;
  if (std::experimental::filesystem::exists(p)) {
    std::experimental::filesystem::remove(p);
  }
  loggers::get_instance().log("certificates_loader::save_certificate: Certificate file: '%s'", p.string().c_str());
  std::ofstream os(p.string(), ios::out | ios::binary);
  os.write(reinterpret_cast<const char *>(p_certificate.certificate().data()), p_certificate.certificate().size());
  os.close();
  std::experimental::filesystem::permissions(p, std::experimental::filesystem::perms::add_perms | std::experimental::filesystem::perms::owner_all | std::experimental::filesystem::perms::group_all | std::experimental::filesystem::perms::others_all);

  // Private key
  p = _full_path;
  p /= p_certificate.certificate_id();
  p += _privateKeyExt;
  if (std::experimental::filesystem::exists(p)) {
    std::experimental::filesystem::remove(p);
  }
  loggers::get_instance().log("certificates_loader::save_certificate: Private key file: '%s'", p.string().c_str());
  os.open(p.string(), ios::out | ios::binary);
  os.write(reinterpret_cast<const char *>(p_certificate.private_key().data()), p_certificate.private_key().size());
  os.close();
  std::experimental::filesystem::permissions(p, std::experimental::filesystem::perms::add_perms | std::experimental::filesystem::perms::owner_all | std::experimental::filesystem::perms::group_all | std::experimental::filesystem::perms::others_all);
  
  // Public keys
  p = _full_path;
  p /= p_certificate.certificate_id();
  p += _publicKeysExt;
  if (std::experimental::filesystem::exists(p)) {
    std::experimental::filesystem::remove(p);
  }
  loggers::get_instance().log("certificates_loader::save_certificate: Public keys file: '%s'", p.string().c_str());
  os.open(p.string(), ios::out | ios::binary);
  os.write(reinterpret_cast<const char *>(p_certificate.public_key_x().data()), p_certificate.public_key_x().size());
  os.write(reinterpret_cast<const char *>(p_certificate.public_key_y().data()), p_certificate.public_key_y().size());
  os.close();
  std::experimental::filesystem::permissions(p, std::experimental::filesystem::perms::add_perms | std::experimental::filesystem::perms::owner_all | std::experimental::filesystem::perms::group_all | std::experimental::filesystem::perms::others_all);

  // Public compressed key
  p = _full_path;
  p /= p_certificate.certificate_id();
  p += _publicCompKeysExt;
  if (std::experimental::filesystem::exists(p)) {
    std::experimental::filesystem::remove(p);
  }
  loggers::get_instance().log("certificates_loader::save_certificate: Public compressed keys file: '%s'", p.string().c_str());
  os.open(p.string(), ios::out | ios::binary);
  os.write(reinterpret_cast<const char *>(p_certificate.public_comp_key().data()), p_certificate.public_comp_key().size());
  os.close();
  std::experimental::filesystem::permissions(p, std::experimental::filesystem::perms::add_perms | std::experimental::filesystem::perms::owner_all | std::experimental::filesystem::perms::group_all | std::experimental::filesystem::perms::others_all);

  // Private encryption key
  if (p_certificate.private_enc_key().size() != 0) {
    p = _full_path;
    p /= p_certificate.certificate_id();
    p += _privateEncKeyExt;
    if (std::experimental::filesystem::exists(p)) {
      std::experimental::filesystem::remove(p);
    }
    loggers::get_instance().log("certificates_loader::save_certificate: Private encryption key file: '%s'", p.string().c_str());
    os.open(p.string(), ios::out | ios::binary);
    os.write(reinterpret_cast<const char *>(p_certificate.private_enc_key().data()), p_certificate.private_enc_key().size());
    os.close();
    std::experimental::filesystem::permissions(p, std::experimental::filesystem::perms::add_perms | std::experimental::filesystem::perms::owner_all | std::experimental::filesystem::perms::group_all | std::experimental::filesystem::perms::others_all);
    
    // Public encription keys
    p = _full_path;
    p /= p_certificate.certificate_id();
    p += _publicEncKeysExt;
    if (std::experimental::filesystem::exists(p)) {
      std::experimental::filesystem::remove(p);
    }
    loggers::get_instance().log("certificates_loader::save_certificate: Public encryption keys file: '%s'", p.string().c_str());
    os.open(p.string(), ios::out | ios::binary);
    os.write(reinterpret_cast<const char *>(p_certificate.public_enc_key_x().data()), p_certificate.public_enc_key_x().size());
    os.write(reinterpret_cast<const char *>(p_certificate.public_enc_key_y().data()), p_certificate.public_enc_key_y().size());
    os.close();
    std::experimental::filesystem::permissions(p, std::experimental::filesystem::perms::add_perms | std::experimental::filesystem::perms::owner_all | std::experimental::filesystem::perms::group_all | std::experimental::filesystem::perms::others_all);
  }
  
  // Issuer
  p = _full_path;
  p /= p_certificate.certificate_id();
  p += _issuerDigestExt;
  if (std::experimental::filesystem::exists(p)) {
    std::experimental::filesystem::remove(p);
  }
  loggers::get_instance().log("certificates_loader::save_certificate: Issuer digest file: '%s'", p.string().c_str());
  os.open(p.string(), ios::out | ios::binary);
  os.write(reinterpret_cast<const char *>(p_certificate.issuer().data()), p_certificate.issuer().size());
  os.close();
  std::experimental::filesystem::permissions(p, std::experimental::filesystem::perms::add_perms | std::experimental::filesystem::perms::owner_all | std::experimental::filesystem::perms::group_all | std::experimental::filesystem::perms::others_all);
   
  // Hashedid8
  p = _full_path;
  p /= p_certificate.certificate_id();
  p += _hashedidDigestExt;
  if (std::experimental::filesystem::exists(p)) {
    std::experimental::filesystem::remove(p);
  }
  loggers::get_instance().log("certificates_loader::save_certificate: Hashedid8 digest file: '%s'", p.string().c_str());
  os.open(p.string(), ios::out | ios::binary);
  os.write(reinterpret_cast<const char *>(p_certificate.hashed_id().data()), p_certificate.hashed_id().size());
  os.close();
  std::experimental::filesystem::permissions(p, std::experimental::filesystem::perms::add_perms | std::experimental::filesystem::perms::owner_all | std::experimental::filesystem::perms::group_all | std::experimental::filesystem::perms::others_all);
  
  return 0;
} // End of method save_certificate

void certificates_loader::fill_public_key_vectors(const IEEE1609dot2BaseTypes::EccP256CurvePoint& p_ecc_point, std::vector<unsigned char>& p_public_comp_key, std::vector<unsigned char>& p_public_key_x, std::vector<unsigned char>& p_public_key_y) {
  loggers::get_instance().log_msg(">>> certificates_loader::fill_public_key_vectors: ", p_ecc_point);
  
  if (p_ecc_point.ischosen(IEEE1609dot2BaseTypes::EccP256CurvePoint::ALT_compressed__y__0)) {
    p_public_comp_key.resize(33);
    p_public_comp_key[0] = 0x02;
    std::copy(static_cast<const unsigned char*>(p_ecc_point.compressed__y__0()), p_ecc_point.compressed__y__0().lengthof() + static_cast<const unsigned char*>(p_ecc_point.compressed__y__0()), p_public_comp_key.begin() + 1);
    p_public_key_x.resize(32);
    p_public_key_y.resize(32);
  } else if (p_ecc_point.ischosen(IEEE1609dot2BaseTypes::EccP256CurvePoint::ALT_compressed__y__1)) {
    p_public_comp_key.resize(33);
    p_public_comp_key[0] = 0x03;
    std::copy(static_cast<const unsigned char*>(p_ecc_point.compressed__y__1()), p_ecc_point.compressed__y__1().lengthof() + static_cast<const unsigned char*>(p_ecc_point.compressed__y__1()), p_public_comp_key.begin() + 1);
    p_public_key_x.resize(32);
    p_public_key_y.resize(32);
  } else if (p_ecc_point.ischosen(IEEE1609dot2BaseTypes::EccP256CurvePoint::ALT_uncompressedP256)) {
    p_public_key_x.assign(static_cast<const unsigned char*>(p_ecc_point.uncompressedP256().x()), p_ecc_point.uncompressedP256().x().lengthof() + static_cast<const unsigned char*>(p_ecc_point.uncompressedP256().x()));
    p_public_key_x.assign(static_cast<const unsigned char*>(p_ecc_point.uncompressedP256().y()), p_ecc_point.uncompressedP256().y().lengthof() + static_cast<const unsigned char*>(p_ecc_point.uncompressedP256().y()));
    p_public_comp_key.assign(33, 0x00);
  } else {
    p_public_key_x.resize(32);
    p_public_key_y.resize(32);
    p_public_comp_key.resize(33);
  }
}
void certificates_loader::fill_public_key_vectors(const IEEE1609dot2BaseTypes::EccP384CurvePoint& p_ecc_point, std::vector<unsigned char>& p_public_comp_key, std::vector<unsigned char>& p_public_key_x, std::vector<unsigned char>& p_public_key_y) {
  loggers::get_instance().log_msg(">>> certificates_loader::fill_public_key_vectors: ", p_ecc_point);

  if (p_ecc_point.ischosen(IEEE1609dot2BaseTypes::EccP384CurvePoint::ALT_compressed__y__0)) {
    p_public_comp_key.resize(49);
    p_public_comp_key[0] = 0x02;
    std::copy(static_cast<const unsigned char*>(p_ecc_point.compressed__y__0()), p_ecc_point.compressed__y__0().lengthof() + static_cast<const unsigned char*>(p_ecc_point.compressed__y__0()), p_public_comp_key.begin() + 1);
    p_public_key_x.resize(48);
    p_public_key_y.resize(48);
  } else if (p_ecc_point.ischosen(IEEE1609dot2BaseTypes::EccP384CurvePoint::ALT_compressed__y__1)) {
    p_public_comp_key.resize(49);
    p_public_comp_key[0] = 0x03;
    std::copy(static_cast<const unsigned char*>(p_ecc_point.compressed__y__1()), p_ecc_point.compressed__y__1().lengthof() + static_cast<const unsigned char*>(p_ecc_point.compressed__y__1()), p_public_comp_key.begin() + 1);
    p_public_key_x.resize(48);
    p_public_key_y.resize(48);
  } else if (p_ecc_point.ischosen(IEEE1609dot2BaseTypes::EccP384CurvePoint::ALT_uncompressedP384)) {
    p_public_key_x.assign(static_cast<const unsigned char*>(p_ecc_point.uncompressedP384().x()), p_ecc_point.uncompressedP384().x().lengthof() + static_cast<const unsigned char*>(p_ecc_point.uncompressedP384().x()));
    p_public_key_x.assign(static_cast<const unsigned char*>(p_ecc_point.uncompressedP384().y()), p_ecc_point.uncompressedP384().y().lengthof() + static_cast<const unsigned char*>(p_ecc_point.uncompressedP384().y()));
    p_public_comp_key.assign(49, 0x00);
  } else {
    p_public_key_x.resize(48);
    p_public_key_y.resize(48);
    p_public_comp_key.resize(49);
  }
}