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|
//! Macros used by this crate
/// Implements the following traits for a newtype of a `der` decodable/encodable type:
///
/// - `From` conversions to/from the inner type
/// - `AsRef` and `AsMut`
/// - `DecodeValue` and `EncodeValue`
/// - `FixedTag` mapping to the inner value's `FixedTag::TAG`
///
/// The main case is simplifying newtypes which need an `AssociatedOid`
#[macro_export]
macro_rules! impl_newtype {
($newtype:ty, $inner:ty) => {
#[allow(unused_lifetimes)]
impl<'a> From<$inner> for $newtype {
#[inline]
fn from(value: $inner) -> Self {
Self(value)
}
}
#[allow(unused_lifetimes)]
impl<'a> From<$newtype> for $inner {
#[inline]
fn from(value: $newtype) -> Self {
value.0
}
}
#[allow(unused_lifetimes)]
impl<'a> AsRef<$inner> for $newtype {
#[inline]
fn as_ref(&self) -> &$inner {
&self.0
}
}
#[allow(unused_lifetimes)]
impl<'a> AsMut<$inner> for $newtype {
#[inline]
fn as_mut(&mut self) -> &mut $inner {
&mut self.0
}
}
#[allow(unused_lifetimes)]
impl<'a> ::der::FixedTag for $newtype {
const TAG: ::der::Tag = <$inner as ::der::FixedTag>::TAG;
}
impl<'a> ::der::DecodeValue<'a> for $newtype {
fn decode_value<R: ::der::Reader<'a>>(
decoder: &mut R,
header: ::der::Header,
) -> ::der::Result<Self> {
Ok(Self(<$inner as ::der::DecodeValue>::decode_value(
decoder, header,
)?))
}
}
#[allow(unused_lifetimes)]
impl<'a> ::der::EncodeValue for $newtype {
fn encode_value(&self, encoder: &mut impl ::der::Writer) -> ::der::Result<()> {
self.0.encode_value(encoder)
}
fn value_len(&self) -> ::der::Result<::der::Length> {
self.0.value_len()
}
}
#[allow(unused_lifetimes)]
impl<'a> ::der::ValueOrd for $newtype {
fn value_cmp(&self, other: &Self) -> ::der::Result<::core::cmp::Ordering> {
self.0.value_cmp(&other.0)
}
}
};
}
/// Implements the AsExtension traits for every defined Extension paylooad
macro_rules! impl_extension {
($newtype:ty) => {
impl_extension!($newtype, critical = false);
};
($newtype:ty, critical = $critical:expr) => {
impl crate::ext::AsExtension for $newtype {
fn critical(
&self,
_subject: &crate::name::Name,
_extensions: &[crate::ext::Extension],
) -> bool {
$critical
}
}
};
}
/// Implements conversions between [`spki::SubjectPublicKeyInfo`] and [`SubjectKeyIdentifier`] or [`AuthorityKeyIdentifier`]
macro_rules! impl_key_identifier {
($newtype:ty, $out:expr) => {
#[cfg(feature = "builder")]
mod builder_key_identifier {
use super::*;
use der::asn1::OctetString;
use sha1::{Digest, Sha1};
use spki::SubjectPublicKeyInfoRef;
impl<'a> TryFrom<SubjectPublicKeyInfoRef<'a>> for $newtype {
type Error = der::Error;
fn try_from(issuer: SubjectPublicKeyInfoRef<'a>) -> Result<Self, Self::Error> {
// https://datatracker.ietf.org/doc/html/rfc5280#section-4.2.1.2
//
// For CA certificates, subject key identifiers SHOULD be derived from
// the public key or a method that generates unique values. Two common
// methods for generating key identifiers from the public key are:
// (1) The keyIdentifier is composed of the 160-bit SHA-1 hash of the
// value of the BIT STRING subjectPublicKey (excluding the tag,
// length, and number of unused bits).
// (2) The keyIdentifier is composed of a four-bit type field with
// the value 0100 followed by the least significant 60 bits of
// the SHA-1 hash of the value of the BIT STRING
// subjectPublicKey (excluding the tag, length, and number of
// unused bits).
// Here we're using the first method
let result = Sha1::digest(issuer.subject_public_key.raw_bytes());
$out(result.as_slice())
}
}
}
};
}
|
