rust/pv: Add-Secret: Add user-data types

Add four new user-data types an add-secret request could have:
Unsigned, Signed(EcSECP521R1, Rsa(2048, 3072))

As the user-data enum was not marked as non-exaustive this might be a
breaking change for users. (Not for any crate in this repo though).

The addition of such user-data is provided by following patches.

Reviewed-by: Marc Hartmayer <mhartmay@linux.ibm.com>
Signed-off-by: Steffen Eiden <seiden@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>

rust/pv/src/uvsecret/asrcb.rs

@@ -240,11 +240,7 @@ impl AddSecretRequest {
         self.keyslots.iter().for_each(|k| aad.push(Aad::Ks(k)));
         aad.push(Aad::Plain(&secr_auth));
 
-        ctx.build_aad(self.version.into(), &aad, conf_len, self.magic())
-    }
-
-    fn magic(&self) -> crate::request::RequestMagic {
-        self.magic.as_bytes().try_into().unwrap()
+        ctx.build_aad(self.version.into(), &aad, conf_len, self.magic.get())
     }
 
     #[doc(hidden)]

rust/pv/src/uvsecret/uvc.rs

@@ -63,7 +63,7 @@ impl AddCmd {
         let mut data = Vec::with_capacity(PAGESIZE);
         bin_add_secret_req.read_to_end(&mut data)?;
 
-        if !AddSecretMagic::starts_with_magic(&data[..6]) {
+        if !AddSecretMagic::starts_with_magic(&data) {
             return Err(Error::NoAsrcb);
         }
         Ok(Self(data))