Fix warnings

Cargo.toml

@@ -58,7 +58,7 @@ serde_test = "1.0.176"
 littlefs2 = { git = "https://github.com/trussed-dev/littlefs2.git", rev = "960e57d9fc0d209308c8e15dc26252bbe1ff6ba8" }
 apdu-dispatch = { git = "https://github.com/trussed-dev/apdu-dispatch.git", rev = "915fc237103fcecc29d0f0b73391f19abf6576de" }
 ctaphid-dispatch = { git = "https://github.com/trussed-dev/ctaphid-dispatch.git", rev = "57cb3317878a8593847595319aa03ef17c29ec5b" }
-trussed = { git = "https://github.com/trussed-dev/trussed.git", rev = "c7a4722b9f414c40ac635c568c595a5ec257082f" }
+trussed = { git = "https://github.com/nitrokey/trussed.git", rev = "0ccdd468859ea14b43e2e95790b9712c398ae5e1" }
 trussed-auth = { git = "https://github.com/trussed-dev/trussed-auth.git", tag = "v0.3.0"}
 trussed-manage = { git = "https://github.com/trussed-dev/trussed-staging.git", tag = "manage-v0.1.0" }
 trussed-rsa-alloc = { git = "https://github.com/trussed-dev/trussed-rsa-backend.git", tag = "v0.2.1" }

src/core_api.rs

@@ -1578,7 +1578,6 @@ impl<Twi: I2CForT1, D: DelayUs<u32>> Se050Backend<Twi, D> {
                 Error::FunctionFailed
             })?;
 
-        p256::ecdsa::Signature::from_der;
         let signature_der = ecdsa_der::DerSignature::from_der(res.signature).map_err(|_err| {
             error!("Failed to parse DER signature: {_err:?}");
             Error::FunctionFailed

src/core_api/ecdsa_der.rs

@@ -26,8 +26,10 @@ impl<'a> DerSignature<'a> {
     }
 
     pub fn to_bytes(&self, field_bytes_size: usize) -> impl Iterator<Item = u8> + 'a {
+        // Required zero padding
         let r_begin = field_bytes_size.saturating_sub(self.r.as_bytes().len());
         let s_begin = field_bytes_size.saturating_sub(self.s.as_bytes().len());
+
         iter::repeat(0)
             .take(r_begin)
             .chain(self.r.as_bytes().iter().cloned())