1 files changed, 90 insertions, 0 deletions
diff --git a/vendor/der/src/asn1/oid.rs b/vendor/der/src/asn1/oid.rs
new file mode 100644
index 000000000..8b287183d
--- /dev/null
+++ b/vendor/der/src/asn1/oid.rs
@@ -0,0 +1,90 @@
+//! ASN.1 `OBJECT IDENTIFIER`
+
+use crate::{
+    asn1::AnyRef, ord::OrdIsValueOrd, DecodeValue, EncodeValue, Error, FixedTag, Header, Length,
+    Reader, Result, Tag, Tagged, Writer,
+};
+use const_oid::ObjectIdentifier;
+
+impl<'a> DecodeValue<'a> for ObjectIdentifier {
+    fn decode_value<R: Reader<'a>>(reader: &mut R, header: Header) -> Result<Self> {
+        let mut buf = [0u8; ObjectIdentifier::MAX_SIZE];
+        let slice = buf
+            .get_mut(..header.length.try_into()?)
+            .ok_or_else(|| Self::TAG.length_error())?;
+
+        let actual_len = reader.read_into(slice)?.len();
+        debug_assert_eq!(actual_len, header.length.try_into()?);
+        Ok(Self::from_bytes(slice)?)
+    }
+}
+
+impl EncodeValue for ObjectIdentifier {
+    fn value_len(&self) -> Result<Length> {
+        Length::try_from(self.as_bytes().len())
+    }
+
+    fn encode_value(&self, writer: &mut dyn Writer) -> Result<()> {
+        writer.write(self.as_bytes())
+    }
+}
+
+impl FixedTag for ObjectIdentifier {
+    const TAG: Tag = Tag::ObjectIdentifier;
+}
+
+impl OrdIsValueOrd for ObjectIdentifier {}
+
+impl<'a> From<&'a ObjectIdentifier> for AnyRef<'a> {
+    fn from(oid: &'a ObjectIdentifier) -> AnyRef<'a> {
+        // Note: ensuring an infallible conversion is possible relies on the
+        // invariant that `const_oid::MAX_LEN <= Length::max()`.
+        //
+        // The `length()` test below ensures this is the case.
+        let value = oid
+            .as_bytes()
+            .try_into()
+            .expect("OID length invariant violated");
+
+        AnyRef::from_tag_and_value(Tag::ObjectIdentifier, value)
+    }
+}
+
+impl TryFrom<AnyRef<'_>> for ObjectIdentifier {
+    type Error = Error;
+
+    fn try_from(any: AnyRef<'_>) -> Result<ObjectIdentifier> {
+        any.tag().assert_eq(Tag::ObjectIdentifier)?;
+        Ok(ObjectIdentifier::from_bytes(any.value())?)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::ObjectIdentifier;
+    use crate::{Decode, Encode, Length};
+
+    const EXAMPLE_OID: ObjectIdentifier = ObjectIdentifier::new_unwrap("1.2.840.113549");
+    const EXAMPLE_OID_BYTES: &[u8; 8] = &[0x06, 0x06, 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d];
+
+    #[test]
+    fn decode() {
+        let oid = ObjectIdentifier::from_der(EXAMPLE_OID_BYTES).unwrap();
+        assert_eq!(EXAMPLE_OID, oid);
+    }
+
+    #[test]
+    fn encode() {
+        let mut buffer = [0u8; 8];
+        assert_eq!(
+            EXAMPLE_OID_BYTES,
+            EXAMPLE_OID.encode_to_slice(&mut buffer).unwrap()
+        );
+    }
+
+    #[test]
+    fn length() {
+        // Ensure an infallible `From` conversion to `Any` will never panic
+        assert!(ObjectIdentifier::MAX_SIZE <= Length::MAX.try_into().unwrap());
+    }
+}