pkcs8/
version.rs

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1//! PKCS#8 version identifier.
2
3use crate::Error;
4use der::{Decode, Encode, FixedTag, Reader, Tag, Writer};
5
6/// Version identifier for PKCS#8 documents.
7///
8/// (RFC 5958 designates `0` and `1` as the only valid versions for PKCS#8 documents)
9#[derive(Clone, Debug, Copy, PartialEq)]
10pub enum Version {
11    /// Denotes PKCS#8 v1: no public key field.
12    V1 = 0,
13
14    /// Denotes PKCS#8 v2: `OneAsymmetricKey` with public key field.
15    V2 = 1,
16}
17
18impl Version {
19    /// Is this version expected to have a public key?
20    pub fn has_public_key(self) -> bool {
21        match self {
22            Version::V1 => false,
23            Version::V2 => true,
24        }
25    }
26}
27
28impl<'a> Decode<'a> for Version {
29    fn decode<R: Reader<'a>>(decoder: &mut R) -> der::Result<Self> {
30        Version::try_from(u8::decode(decoder)?).map_err(|_| Self::TAG.value_error())
31    }
32}
33
34impl Encode for Version {
35    fn encoded_len(&self) -> der::Result<der::Length> {
36        der::Length::from(1u8).for_tlv()
37    }
38
39    fn encode(&self, writer: &mut dyn Writer) -> der::Result<()> {
40        u8::from(*self).encode(writer)
41    }
42}
43
44impl From<Version> for u8 {
45    fn from(version: Version) -> Self {
46        version as u8
47    }
48}
49
50impl TryFrom<u8> for Version {
51    type Error = Error;
52    fn try_from(byte: u8) -> Result<Version, Error> {
53        match byte {
54            0 => Ok(Version::V1),
55            1 => Ok(Version::V2),
56            _ => Err(Self::TAG.value_error().into()),
57        }
58    }
59}
60
61impl FixedTag for Version {
62    const TAG: Tag = Tag::Integer;
63}
pkcs8/version.rs

pkcs8/
version.rs
