Function nginx::OCSP_request_sign

pub unsafe extern "C" fn OCSP_request_sign(
    req: *mut OCSP_REQUEST, 
    signer: *mut X509, 
    key: *mut EVP_PKEY, 
    dgst: *const EVP_MD, 
    certs: *mut stack_st_X509, 
    flags: c_ulong
) -> c_int