Derive Integer for pkcs10::Version

Signed-off-by: Nathaniel McCallum <nathaniel@profian.com>

pkcs10/src/version.rs

@@ -1,49 +1,14 @@
 //! Certification request information version identifier.
 
-use der::{Decodable, Decoder, Encodable, Encoder, FixedTag, Tag};
+use der::Enumerated;
 
 /// Version identifier for certification request information.
 ///
 /// (RFC 2986 designates `0` as the only valid version)
-#[derive(Clone, Debug, Copy, PartialEq, Eq)]
+#[derive(Clone, Debug, Copy, PartialEq, Eq, Enumerated)]
+#[asn1(type = "INTEGER")]
+#[repr(u8)]
 pub enum Version {
     /// Denotes PKCS#8 v1
     V1 = 0,
 }
-
-impl Decodable<'_> for Version {
-    fn decode(decoder: &mut Decoder<'_>) -> der::Result<Self> {
-        Version::try_from(u8::decode(decoder)?).map_err(|_| Self::TAG.value_error())
-    }
-}
-
-impl Encodable for Version {
-    fn encoded_len(&self) -> der::Result<der::Length> {
-        der::Length::from(1u8).for_tlv()
-    }
-
-    fn encode(&self, encoder: &mut Encoder<'_>) -> der::Result<()> {
-        u8::from(*self).encode(encoder)
-    }
-}
-
-impl From<Version> for u8 {
-    fn from(version: Version) -> Self {
-        version as u8
-    }
-}
-
-impl TryFrom<u8> for Version {
-    type Error = der::Error;
-
-    fn try_from(byte: u8) -> Result<Version, der::Error> {
-        match byte {
-            0 => Ok(Version::V1),
-            _ => Err(Self::TAG.value_error()),
-        }
-    }
-}
-
-impl FixedTag for Version {
-    const TAG: Tag = Tag::Integer;
-}