BEGIN {
    define_struct(
        'EFS_HASH_BLOB',
        qw/
          DWORD cbData;
          LPBYTE pbData;
          /
    );
    define_struct(
        'ENCRYPTION_CERTIFICATE_HASH',
        qw/
          DWORD cbTotalLength;
          void* pUserSid;
          LPEFS_HASH_BLOB pHash;
          LPWSTR lpDisplayInformation;
          /
    );
    define_struct(
        'ENCRYPTION_CERTIFICATE_HASH_LIST',
        qw/
          DWORD nCert_Hash;
          LPENCRYPTION_CERTIFICATE_HASH* pUsers;
          /
    );
}