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use core::convert::{TryFrom, TryInto};
use der::{
asn1::{Any, ObjectIdentifier},
Decodable, Encodable, Error, ErrorKind, Message, Result,
};
#[derive(Copy, Clone, Debug, Eq, PartialEq)]
pub struct AlgorithmIdentifier<'a> {
pub oid: ObjectIdentifier,
pub parameters: Option<Any<'a>>,
}
impl<'a> AlgorithmIdentifier<'a> {
pub fn assert_algorithm_oid(&self, expected_oid: ObjectIdentifier) -> Result<ObjectIdentifier> {
if self.oid == expected_oid {
Ok(expected_oid)
} else {
Err(ErrorKind::UnknownOid { oid: expected_oid }.into())
}
}
pub fn assert_parameters_oid(
&self,
expected_oid: ObjectIdentifier,
) -> Result<ObjectIdentifier> {
let actual_oid = self.parameters_oid()?;
if actual_oid == expected_oid {
Ok(actual_oid)
} else {
Err(ErrorKind::UnknownOid { oid: expected_oid }.into())
}
}
pub fn assert_oids(
&self,
algorithm: ObjectIdentifier,
parameters: ObjectIdentifier,
) -> Result<()> {
self.assert_algorithm_oid(algorithm)?;
self.assert_parameters_oid(parameters)?;
Ok(())
}
pub fn parameters_any(&self) -> Result<Any<'a>> {
self.parameters.ok_or_else(|| ErrorKind::Truncated.into())
}
pub fn parameters_oid(&self) -> Result<ObjectIdentifier> {
self.parameters_any().and_then(TryInto::try_into)
}
}
impl<'a> TryFrom<&'a [u8]> for AlgorithmIdentifier<'a> {
type Error = Error;
fn try_from(bytes: &'a [u8]) -> Result<Self> {
Self::from_der(bytes)
}
}
impl<'a> TryFrom<Any<'a>> for AlgorithmIdentifier<'a> {
type Error = Error;
fn try_from(any: Any<'a>) -> Result<AlgorithmIdentifier<'a>> {
any.sequence(|decoder| {
let oid = decoder.decode()?;
let parameters = decoder.decode()?;
Ok(Self { oid, parameters })
})
}
}
impl<'a> Message<'a> for AlgorithmIdentifier<'a> {
fn fields<F, T>(&self, f: F) -> Result<T>
where
F: FnOnce(&[&dyn Encodable]) -> Result<T>,
{
f(&[&self.oid, &self.parameters])
}
}