Function nginx::DSA_meth_get_sign_setup

pub unsafe extern "C" fn DSA_meth_get_sign_setup(
    dsam: *const DSA_METHOD
) -> Option<unsafe extern "C" fn(dsam: *mut DSA, arg1: *mut BN_CTX, arg2: *mut *mut BIGNUM, arg3: *mut *mut BIGNUM) -> c_int>