1 files changed, 63 insertions, 0 deletions
diff --git a/vendor/pkcs8/src/version.rs b/vendor/pkcs8/src/version.rs
new file mode 100644
index 000000000..339368392
--- /dev/null
+++ b/vendor/pkcs8/src/version.rs
@@ -0,0 +1,63 @@
+//! PKCS#8 version identifier.
+
+use crate::Error;
+use der::{Decode, Encode, FixedTag, Reader, Tag, Writer};
+
+/// Version identifier for PKCS#8 documents.
+///
+/// (RFC 5958 designates `0` and `1` as the only valid versions for PKCS#8 documents)
+#[derive(Clone, Debug, Copy, PartialEq)]
+pub enum Version {
+    /// Denotes PKCS#8 v1: no public key field.
+    V1 = 0,
+
+    /// Denotes PKCS#8 v2: `OneAsymmetricKey` with public key field.
+    V2 = 1,
+}
+
+impl Version {
+    /// Is this version expected to have a public key?
+    pub fn has_public_key(self) -> bool {
+        match self {
+            Version::V1 => false,
+            Version::V2 => true,
+        }
+    }
+}
+
+impl<'a> Decode<'a> for Version {
+    fn decode<R: Reader<'a>>(decoder: &mut R) -> der::Result<Self> {
+        Version::try_from(u8::decode(decoder)?).map_err(|_| Self::TAG.value_error())
+    }
+}
+
+impl Encode for Version {
+    fn encoded_len(&self) -> der::Result<der::Length> {
+        der::Length::from(1u8).for_tlv()
+    }
+
+    fn encode(&self, writer: &mut dyn Writer) -> der::Result<()> {
+        u8::from(*self).encode(writer)
+    }
+}
+
+impl From<Version> for u8 {
+    fn from(version: Version) -> Self {
+        version as u8
+    }
+}
+
+impl TryFrom<u8> for Version {
+    type Error = Error;
+    fn try_from(byte: u8) -> Result<Version, Error> {
+        match byte {
+            0 => Ok(Version::V1),
+            1 => Ok(Version::V2),
+            _ => Err(Self::TAG.value_error().into()),
+        }
+    }
+}
+
+impl FixedTag for Version {
+    const TAG: Tag = Tag::Integer;
+}