--- a/src/module.rs	Mon May 05 00:16:04 2025 -0400
+++ b/src/module.rs	Wed May 21 00:27:18 2025 -0400
@@ -1,10 +1,10 @@
 //! Functions for use in pam modules.
 
-use crate::constants::{Flags, PamResult, ErrorCode};
+use crate::constants::{ErrorCode, Flags, PamResult};
 use crate::items::{Item, ItemType};
 use libc::c_char;
+use secure_string::SecureString;
 use std::ffi::{c_int, CStr, CString};
-use secure_string::SecureString;
 
 /// Opaque type, used as a pointer when making pam API calls.
 ///
@@ -27,7 +27,7 @@
     fn pam_set_data(
         pamh: *const PamHandle,
         module_data_name: *const c_char,
-        data: *mut libc::c_void,
+        data: *const libc::c_void,
         cleanup: extern "C" fn(
             pamh: *const PamHandle,
             data: *mut libc::c_void,
@@ -43,12 +43,16 @@
 
     fn pam_set_item(pamh: *mut PamHandle, item_type: c_int, item: *const libc::c_void) -> c_int;
 
-    fn pam_get_user(pamh: *const PamHandle, user: &*mut c_char, prompt: *const c_char) -> c_int;
+    fn pam_get_user(
+        pamh: *const PamHandle,
+        user: &mut *const c_char,
+        prompt: *const c_char,
+    ) -> c_int;
 
     fn pam_get_authtok(
         pamh: *const PamHandle,
         item_type: c_int,
-        data: &*mut c_char,
+        data: &mut *const c_char,
         prompt: *const c_char,
     ) -> c_int;
 
@@ -60,7 +64,7 @@
 /// You should never call this yourself.
 extern "C" fn cleanup<T>(_: *const PamHandle, c_data: *mut libc::c_void, _: c_int) {
     unsafe {
-        let _data: Box<T> = Box::from_raw(c_data.cast::<T>());
+        let _data: Box<T> = Box::from_raw(c_data.cast());
     }
 }
 
@@ -88,7 +92,7 @@
         match ptr.is_null() {
             true => Ok(None),
             false => {
-                let typed_ptr = ptr.cast::<T>();
+                let typed_ptr = ptr.cast();
                 Ok(Some(&*typed_ptr))
             }
         }
@@ -109,7 +113,7 @@
             pam_set_data(
                 self,
                 c_key.as_ptr(),
-                Box::into_raw(data).cast::<libc::c_void>(),
+                Box::into_raw(data).cast(),
                 cleanup::<T>,
             )
         };
@@ -133,7 +137,7 @@
         let out = unsafe {
             let ret = pam_get_item(self, T::type_id().into(), &mut ptr);
             ErrorCode::result_from(ret)?;
-            let typed_ptr = ptr.cast::<T::Raw>();
+            let typed_ptr: *const T::Raw = ptr.cast();
             match typed_ptr.is_null() {
                 true => None,
                 false => Some(T::from_raw(typed_ptr)),
@@ -151,8 +155,7 @@
     ///
     /// Returns an error if the underlying PAM function call fails.
     pub fn set_item<T: Item>(&mut self, item: T) -> PamResult<()> {
-        let ret =
-            unsafe { pam_set_item(self, T::type_id().into(), item.into_raw().cast::<libc::c_void>()) };
+        let ret = unsafe { pam_set_item(self, T::type_id().into(), item.into_raw().cast()) };
         ErrorCode::result_from(ret)
     }
 
@@ -168,8 +171,8 @@
     /// Returns an error if the underlying PAM function call fails.
     pub fn get_user(&self, prompt: Option<&str>) -> PamResult<String> {
         let prompt = option_cstr(prompt)?;
-        let output: *mut c_char = std::ptr::null_mut();
-        let ret = unsafe { pam_get_user(self, &output, prompt_ptr(prompt.as_ref())) };
+        let mut output: *const c_char = std::ptr::null_mut();
+        let ret = unsafe { pam_get_user(self, &mut output, prompt_ptr(prompt.as_ref())) };
         ErrorCode::result_from(ret)?;
         copy_pam_string(output)
     }
@@ -186,12 +189,12 @@
     /// Returns an error if the underlying PAM function call fails.
     pub fn get_authtok(&self, prompt: Option<&str>) -> PamResult<SecureString> {
         let prompt = option_cstr(prompt)?;
-        let output: *mut c_char = std::ptr::null_mut();
+        let mut output: *const c_char = std::ptr::null_mut();
         let res = unsafe {
             pam_get_authtok(
                 self,
                 ItemType::AuthTok.into(),
-                &output,
+                &mut output,
                 prompt_ptr(prompt.as_ref()),
             )
         };