pub unsafe extern "C" fn sgx_pce_sign_report(
isv_svn: *const sgx_isv_svn_t,
cpu_svn: *const sgx_cpu_svn_t,
p_report: *const sgx_report_t,
p_signature: *mut u8,
signature_buf_size: u32,
p_signature_out_size: *mut u32
) -> sgx_pce_error_t