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//! SPKI fingerprint support.
use der::Writer;
use sha2::{Digest, Sha256};
/// Size of a SHA-256 SPKI fingerprint in bytes.
pub(crate) const SIZE: usize = 32;
/// Raw bytes of a SPKI fingerprint i.e. SHA-256 digest of
/// `SubjectPublicKeyInfo`'s DER encoding.
///
/// See [RFC7469 § 2.1.1] for more information.
///
/// [RFC7469 § 2.1.1]: https://datatracker.ietf.org/doc/html/rfc7469#section-2.1.1
pub type FingerprintBytes = [u8; SIZE];
/// Writer newtype which accepts DER being serialized on-the-fly and computes a
/// hash of the contents.
#[derive(Clone, Default)]
pub(crate) struct Builder {
/// In-progress digest being computed from streaming DER.
digest: Sha256,
}
impl Builder {
/// Create a new fingerprint builder.
pub fn new() -> Self {
Self::default()
}
/// Finish computing a fingerprint, returning the computed digest.
pub fn finish(self) -> FingerprintBytes {
self.digest.finalize().into()
}
}
impl Writer for Builder {
fn write(&mut self, der_bytes: &[u8]) -> der::Result<()> {
self.digest.update(der_bytes);
Ok(())
}
}
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