Revert "Review: check if the target key is symmetric before use"

This reverts commit fdc90f3.

This is required to make Nitrokey Webcrypt working at the moment, but should be removed in the future.

src/hmacsha256p256/mod.rs

@@ -11,7 +11,6 @@ use trussed::{
     types::{Bytes, CoreContext, KeyId, Location, Mechanism},
     Error,
 };
-use trussed::key::Kind::Symmetric;
 
 #[derive(Debug, Default)]
 pub struct HmacSha256P256Extension;
@@ -148,7 +147,7 @@ pub fn derive_key_from_hash(
     type HmacSha256P256 = Hmac<sha2::Sha256>;
 
     let key_id = request.key;
-    let key = keystore.load_key(key::Secrecy::Secret, Some(Symmetric(32)), &key_id)?;
+    let key = keystore.load_key(key::Secrecy::Secret, None, &key_id)?;
     let shared_secret = key.material;
 
     let mut mac =