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//! X.509 `SubjectPublicKeyInfo`
use crate::{AlgorithmIdentifier, Error, Result};
use core::cmp::Ordering;
use der::{
asn1::BitStringRef, Decode, DecodeValue, DerOrd, Encode, Header, Reader, Sequence, ValueOrd,
};
#[cfg(feature = "alloc")]
use der::Document;
#[cfg(feature = "fingerprint")]
use crate::{fingerprint, FingerprintBytes};
#[cfg(all(feature = "alloc", feature = "fingerprint"))]
use {
alloc::string::String,
base64ct::{Base64, Encoding},
};
#[cfg(feature = "pem")]
use der::pem::PemLabel;
/// X.509 `SubjectPublicKeyInfo` (SPKI) as defined in [RFC 5280 § 4.1.2.7].
///
/// ASN.1 structure containing an [`AlgorithmIdentifier`] and public key
/// data in an algorithm specific format.
///
/// ```text
/// SubjectPublicKeyInfo ::= SEQUENCE {
/// algorithm AlgorithmIdentifier,
/// subjectPublicKey BIT STRING }
/// ```
///
/// [RFC 5280 § 4.1.2.7]: https://tools.ietf.org/html/rfc5280#section-4.1.2.7
#[derive(Copy, Clone, Debug, Eq, PartialEq)]
pub struct SubjectPublicKeyInfo<'a> {
/// X.509 [`AlgorithmIdentifier`] for the public key type
pub algorithm: AlgorithmIdentifier<'a>,
/// Public key data
pub subject_public_key: &'a [u8],
}
impl<'a> SubjectPublicKeyInfo<'a> {
/// Calculate the SHA-256 fingerprint of this [`SubjectPublicKeyInfo`] and
/// encode it as a Base64 string.
///
/// See [RFC7469 § 2.1.1] for more information.
///
/// [RFC7469 § 2.1.1]: https://datatracker.ietf.org/doc/html/rfc7469#section-2.1.1
#[cfg(all(feature = "fingerprint", feature = "alloc"))]
#[cfg_attr(docsrs, doc(cfg(all(feature = "fingerprint", feature = "alloc"))))]
pub fn fingerprint_base64(&self) -> Result<String> {
Ok(Base64::encode_string(&self.fingerprint_bytes()?))
}
/// Calculate the SHA-256 fingerprint of this [`SubjectPublicKeyInfo`] as
/// a raw byte array.
///
/// See [RFC7469 § 2.1.1] for more information.
///
/// [RFC7469 § 2.1.1]: https://datatracker.ietf.org/doc/html/rfc7469#section-2.1.1
#[cfg(feature = "fingerprint")]
#[cfg_attr(docsrs, doc(cfg(feature = "fingerprint")))]
pub fn fingerprint_bytes(&self) -> Result<FingerprintBytes> {
let mut builder = fingerprint::Builder::new();
self.encode(&mut builder)?;
Ok(builder.finish())
}
/// Get a [`BitString`] representing the `subject_public_key`
fn bitstring(&self) -> der::Result<BitStringRef<'a>> {
BitStringRef::from_bytes(self.subject_public_key)
}
}
impl<'a> DecodeValue<'a> for SubjectPublicKeyInfo<'a> {
fn decode_value<R: Reader<'a>>(reader: &mut R, header: Header) -> der::Result<Self> {
reader.read_nested(header.length, |reader| {
Ok(Self {
algorithm: reader.decode()?,
subject_public_key: BitStringRef::decode(reader)?
.as_bytes()
.ok_or_else(|| der::Tag::BitString.value_error())?,
})
})
}
}
impl<'a> Sequence<'a> for SubjectPublicKeyInfo<'a> {
fn fields<F, T>(&self, f: F) -> der::Result<T>
where
F: FnOnce(&[&dyn Encode]) -> der::Result<T>,
{
f(&[&self.algorithm, &self.bitstring()?])
}
}
impl<'a> TryFrom<&'a [u8]> for SubjectPublicKeyInfo<'a> {
type Error = Error;
fn try_from(bytes: &'a [u8]) -> Result<Self> {
Ok(Self::from_der(bytes)?)
}
}
impl ValueOrd for SubjectPublicKeyInfo<'_> {
fn value_cmp(&self, other: &Self) -> der::Result<Ordering> {
match self.algorithm.der_cmp(&other.algorithm)? {
Ordering::Equal => self.bitstring()?.der_cmp(&other.bitstring()?),
other => Ok(other),
}
}
}
#[cfg(feature = "alloc")]
#[cfg_attr(docsrs, doc(cfg(feature = "alloc")))]
impl TryFrom<SubjectPublicKeyInfo<'_>> for Document {
type Error = Error;
fn try_from(spki: SubjectPublicKeyInfo<'_>) -> Result<Document> {
Self::try_from(&spki)
}
}
#[cfg(feature = "alloc")]
#[cfg_attr(docsrs, doc(cfg(feature = "alloc")))]
impl TryFrom<&SubjectPublicKeyInfo<'_>> for Document {
type Error = Error;
fn try_from(spki: &SubjectPublicKeyInfo<'_>) -> Result<Document> {
Ok(Self::encode_msg(spki)?)
}
}
#[cfg(feature = "pem")]
#[cfg_attr(docsrs, doc(cfg(feature = "pem")))]
impl PemLabel for SubjectPublicKeyInfo<'_> {
const PEM_LABEL: &'static str = "PUBLIC KEY";
}
|
