Function nginx::RSA_meth_get_mod_exp

pub unsafe extern "C" fn RSA_meth_get_mod_exp(
    meth: *const RSA_METHOD
) -> Option<unsafe extern "C" fn(meth: *mut BIGNUM, arg1: *const BIGNUM, arg2: *mut RSA, arg3: *mut BN_CTX) -> c_int>