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|
use std::convert::TryFrom;
use std::cmp;
use std::cmp::Ordering;
use std::borrow::Borrow;
use crate::{
Error,
Fingerprint,
KeyID,
Result,
};
/// Enum representing an identifier for certificates and keys.
///
/// A `KeyHandle` contains either a [`Fingerprint`] or a [`KeyID`].
/// This is needed because signatures can reference their issuer
/// either by `Fingerprint` or by `KeyID`.
///
/// Currently, Sequoia supports *version 4* fingerprints and Key ID
/// only. *Version 3* fingerprints and Key ID were deprecated by [RFC
/// 4880] in 2007.
///
/// A *v4* fingerprint is, essentially, a 20-byte SHA-1 hash over the
/// key's public key packet. A *v4* Key ID is defined as the
/// fingerprint's lower 8 bytes.
///
/// For the exact definition, see [Section 12.2 of RFC 4880].
///
/// Both fingerprint and Key ID are used to identify a key, e.g., the
/// issuer of a signature.
///
/// [RFC 4880]: https://tools.ietf.org/html/rfc4880
/// [Section 12.2 of RFC 4880]: https://tools.ietf.org/html/rfc4880#section-12.2
///
/// # Examples
///
/// ```rust
/// # fn main() -> sequoia_openpgp::Result<()> {
/// # use sequoia_openpgp as openpgp;
/// use openpgp::KeyHandle;
/// use openpgp::Packet;
/// use openpgp::parse::Parse;
///
/// let p = Packet::from_bytes(
/// "-----BEGIN PGP SIGNATURE-----
/// #
/// # wsBzBAABCgAdFiEEwD+mQRsDrhJXZGEYciO1ZnjgJSgFAlnclx8ACgkQciO1Znjg
/// # JShldAf+NBvUTVPnVPhYM4KihWOUlup8lbD6g1IduSM5rpsGvOVb+uKF6ik+GOBB
/// # RlMT4s183r3teFxiTkDx2pRhUz0MnOMPfbXovjF6Y93fKCOxCQWLBa0ukjNmE+ax
/// # gu9nZ3XXDGXZW22iGE52uVjPGSfuLfqvdMy5bKHn8xow/kepuGHZwy8yn7uFv7sl
/// # LnOBUz1FKA7iRl457XKPUhw5K7BnfRW/I2BRlnrwTDkjfXaJZC+bUTIJvm682Bvt
/// # ZNn8zc0JucyEkuL9WXYNuZg0znDE3T7D/6+tzfEdSf706unsXFXWHf83vL2eHCcw
/// # qhImm1lmcC+agFtWQ6/qD923LR9xmg==
/// # =htNu
/// # -----END PGP SIGNATURE-----" /* docstring trickery ahead:
/// // ...
/// -----END PGP SIGNATURE-----")?;
/// # */)?;
/// if let Packet::Signature(sig) = p {
/// let issuers = sig.get_issuers();
/// assert_eq!(issuers.len(), 2);
/// assert_eq!(&issuers[0],
/// &KeyHandle::Fingerprint(
/// "C03F A641 1B03 AE12 5764 6118 7223 B566 78E0 2528"
/// .parse()?));
/// assert_eq!(&issuers[1],
/// &KeyHandle::KeyID("7223 B566 78E0 2528".parse()?));
/// } else {
/// unreachable!("It's a signature!");
/// }
/// # Ok(()) }
/// ```
#[derive(Debug, Clone)]
pub enum KeyHandle {
/// A Fingerprint.
Fingerprint(Fingerprint),
/// A KeyID.
KeyID(KeyID),
}
assert_send_and_sync!(KeyHandle);
impl std::fmt::Display for KeyHandle {
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
match self {
KeyHandle::Fingerprint(v) => v.fmt(f),
KeyHandle::KeyID(v) => v.fmt(f),
}
}
}
impl std::fmt::UpperHex for KeyHandle {
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
match &self {
KeyHandle::Fingerprint(ref fpr) => write!(f, "{:X}", fpr),
KeyHandle::KeyID(ref keyid) => write!(f, "{:X}", keyid),
}
}
}
impl std::fmt::LowerHex for KeyHandle {
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
match &self {
KeyHandle::Fingerprint(ref fpr) => write!(f, "{:x}", fpr),
KeyHandle::KeyID(ref keyid) => write!(f, "{:x}", keyid),
}
}
}
impl From<KeyID> for KeyHandle {
fn from(i: KeyID) -> Self {
KeyHandle::KeyID(i)
}
}
impl From<&KeyID> for KeyHandle {
fn from(i: &KeyID) -> Self {
KeyHandle::KeyID(i.clone())
}
}
impl From<KeyHandle> for KeyID {
fn from(i: KeyHandle) -> Self {
match i {
KeyHandle::Fingerprint(i) => i.into(),
KeyHandle::KeyID(i) => i,
}
}
}
impl From<&KeyHandle> for KeyID {
fn from(i: &KeyHandle) -> Self {
match i {
KeyHandle::Fingerprint(i) => i.clone().into(),
KeyHandle::KeyID(i) => i.clone(),
}
}
}
impl From<Fingerprint> for KeyHandle {
fn from(i: Fingerprint) -> Self {
KeyHandle::Fingerprint(i)
}
}
impl From<&Fingerprint> for KeyHandle {
fn from(i: &Fingerprint) -> Self {
KeyHandle::Fingerprint(i.clone())
}
}
impl TryFrom<KeyHandle> for Fingerprint {
type Error = anyhow::Error;
fn try_from(i: KeyHandle) -> Result<Self> {
match i {
KeyHandle::Fingerprint(i) => Ok(i),
KeyHandle::KeyID(i) => Err(Error::InvalidOperation(
format!("Cannot convert keyid {} to fingerprint", i)).into()),
}
}
}
impl TryFrom<&KeyHandle> for Fingerprint {
type Error = anyhow::Error;
fn try_from(i: &KeyHandle) -> Result<Self> {
match i {
KeyHandle::Fingerprint(i) => Ok(i.clone()),
KeyHandle::KeyID(i) => Err(Error::InvalidOperation(
format!("Cannot convert keyid {} to fingerprint", i)).into()),
}
}
}
impl PartialOrd for KeyHandle {
fn partial_cmp(&self, other: &KeyHandle) -> Option<Ordering> {
let a = self.as_bytes();
let b = other.as_bytes();
let l = cmp::min(a.len(), b.len());
// Do a little endian comparison so that for v4 keys (where
// the KeyID is a suffix of the Fingerprint) equivalent KeyIDs
// and Fingerprints sort next to each other.
for (a, b) in a[a.len()-l..].iter().zip(b[b.len()-l..].iter()) {
let cmp = a.cmp(b);
if cmp != Ordering::Equal {
return Some(cmp);
}
}
if a.len() == b.len() {
Some(Ordering::Equal)
} else {
// One (a KeyID) is the suffix of the other (a
|