CCCID/CHUID refactoring

- Move generate methods to the appropriate static types
- Remove redundant name prefixes (Rust [RFC#356])

[RFC#356]: https://github.com/rust-lang/rfcs/pull/356

src/cccid.rs

@@ -48,27 +48,29 @@ const CCC_TMPL: &[u8] = &[
     0x00, 0xfe, 0x00,
 ];
 
-/// Cardholder Capability Container (CCC) Identifier card ID
+/// Cardholder Capability Container (CCC) Identifier Card ID
 #[derive(Copy, Clone, Debug, Eq, PartialEq)]
-pub struct CccCardId(pub [u8; YKPIV_CCCID_SIZE]);
+pub struct CardId(pub [u8; YKPIV_CCCID_SIZE]);
+
+impl CardId {
+    /// Generate a random CCC Card ID
+    pub fn generate() -> Result<Self, Error> {
+        let mut id = [0u8; YKPIV_CCCID_SIZE];
+        getrandom(&mut id).map_err(|_| Error::RandomnessError)?;
+        Ok(Self(id))
+    }
+}
 
 /// Cardholder Capability Container (CCC) Identifier
 #[derive(Copy, Clone)]
 pub struct CCC(pub [u8; YKPIV_CCC_SIZE]);
 
 impl CCC {
-    /// Return CardId component of CHUID
-    pub fn cccid(&self) -> Result<CccCardId, Error> {
+    /// Return CardId component of CCC
+    pub fn cccid(&self) -> Result<CardId, Error> {
         let mut cccid = [0u8; YKPIV_CCCID_SIZE];
         cccid.copy_from_slice(&self.0[CCC_ID_OFFS..(CCC_ID_OFFS + YKPIV_CCCID_SIZE)]);
-        Ok(CccCardId(cccid))
-    }
-
-    /// Generate a random CCCID
-    pub fn generate() -> Result<CccCardId, Error> {
-        let mut id = [0u8; YKPIV_CCCID_SIZE];
-        getrandom(&mut id).map_err(|_| Error::RandomnessError)?;
-        Ok(CccCardId(id))
+        Ok(CardId(cccid))
     }
 
     /// Get Cardholder Capability Container (CCC) ID
@@ -82,7 +84,7 @@ impl CCC {
 
         let mut ccc = [0u8; YKPIV_CCC_SIZE];
         ccc.copy_from_slice(&response[0..YKPIV_CCC_SIZE]);
-        Ok(CCC { 0: ccc })
+        Ok(Self(ccc))
     }
 
     /// Get Cardholder Capability Container (CCC) ID