From 777cbd0fee8187325b0272d3264b535828d4b4ea Mon Sep 17 00:00:00 2001
From: Robin Krahl <robin.krahl@ireas.org>
Date: Tue, 28 Jan 2020 19:47:39 +0100
Subject: Remove AuthenticatedDevice::temp_password_ptr

We introduced the AuthenticatedDevice::temp_password_ptr function to
reduce the number of casts needed in our code base.  Since we switched
from Vec<u8> to CString, we no longer have to cast the return value of
as_ptr.  Therefore we can remove the temp_password_ptr function to
reduce code complexity.
---
 src/auth.rs | 24 +++++++-----------------
 1 file changed, 7 insertions(+), 17 deletions(-)

diff --git a/src/auth.rs b/src/auth.rs
index 571e198..6748ca1 100644
--- a/src/auth.rs
+++ b/src/auth.rs
@@ -119,8 +119,6 @@ pub trait Authenticate<'a> {
 
 trait AuthenticatedDevice<T> {
     fn new(device: T, temp_password: CString) -> Self;
-
-    fn temp_password_ptr(&self) -> *const c_char;
 }
 
 /// A Nitrokey device with user authentication.
@@ -235,13 +233,13 @@ impl<'a, T: Device<'a>> ops::DerefMut for User<'a, T> {
 impl<'a, T: Device<'a>> GenerateOtp for User<'a, T> {
     fn get_hotp_code(&mut self, slot: u8) -> Result<String, Error> {
         result_from_string(unsafe {
-            nitrokey_sys::NK_get_hotp_code_PIN(slot, self.temp_password_ptr())
+            nitrokey_sys::NK_get_hotp_code_PIN(slot, self.temp_password.as_ptr())
         })
     }
 
     fn get_totp_code(&self, slot: u8) -> Result<String, Error> {
         result_from_string(unsafe {
-            nitrokey_sys::NK_get_totp_code_PIN(slot, 0, 0, 0, self.temp_password_ptr())
+            nitrokey_sys::NK_get_totp_code_PIN(slot, 0, 0, 0, self.temp_password.as_ptr())
         })
     }
 }
@@ -254,10 +252,6 @@ impl<'a, T: Device<'a>> AuthenticatedDevice<T> for User<'a, T> {
             marker: marker::PhantomData,
         }
     }
-
-    fn temp_password_ptr(&self) -> *const c_char {
-        self.temp_password.as_ptr()
-    }
 }
 
 impl<'a, T: Device<'a>> ops::Deref for Admin<'a, T> {
@@ -319,7 +313,7 @@ impl<'a, T: Device<'a>> Admin<'a, T> {
                 raw_config.scrollock,
                 raw_config.user_password,
                 false,
-                self.temp_password_ptr(),
+                self.temp_password.as_ptr(),
             )
         })
     }
@@ -338,7 +332,7 @@ impl<'a, T: Device<'a>> ConfigureOtp for Admin<'a, T> {
                 raw_data.use_enter,
                 raw_data.use_token_id,
                 raw_data.token_id.as_ptr(),
-                self.temp_password_ptr(),
+                self.temp_password.as_ptr(),
             )
         })
     }
@@ -355,20 +349,20 @@ impl<'a, T: Device<'a>> ConfigureOtp for Admin<'a, T> {
                 raw_data.use_enter,
                 raw_data.use_token_id,
                 raw_data.token_id.as_ptr(),
-                self.temp_password_ptr(),
+                self.temp_password.as_ptr(),
             )
         })
     }
 
     fn erase_hotp_slot(&mut self, slot: u8) -> Result<(), Error> {
         get_command_result(unsafe {
-            nitrokey_sys::NK_erase_hotp_slot(slot, self.temp_password_ptr())
+            nitrokey_sys::NK_erase_hotp_slot(slot, self.temp_password.as_ptr())
         })
     }
 
     fn erase_totp_slot(&mut self, slot: u8) -> Result<(), Error> {
         get_command_result(unsafe {
-            nitrokey_sys::NK_erase_totp_slot(slot, self.temp_password_ptr())
+            nitrokey_sys::NK_erase_totp_slot(slot, self.temp_password.as_ptr())
         })
     }
 }
@@ -381,10 +375,6 @@ impl<'a, T: Device<'a>> AuthenticatedDevice<T> for Admin<'a, T> {
             marker: marker::PhantomData,
         }
     }
-
-    fn temp_password_ptr(&self) -> *const c_char {
-        self.temp_password.as_ptr()
-    }
 }
 
 impl<'a> Authenticate<'a> for DeviceWrapper<'a> {
-- 
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