Enum sequoia_openpgp::KeyHandle

pub enum KeyHandle {
    Fingerprint(Fingerprint),
    KeyID(KeyID),
}

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.

Examples

use openpgp::KeyHandle;
use openpgp::Packet;
use openpgp::parse::Parse;

let p = Packet::from_bytes(
    "-----BEGIN PGP SIGNATURE-----
     // ...
     -----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!");
}

Variants

Fingerprint(Fingerprint)

A Fingerprint.

KeyID(KeyID)

A KeyID.

Implementations

impl KeyHandle

pub fn as_bytes(&self) -> &[u8]

Returns the raw identifier as a byte slice.

pub fn aliases<H>(&self, other: H) -> bool where
    H: Borrow<KeyHandle>, 

Returns whether self and other could be aliases of each other.

KeyHandle's PartialEq implementation cannot assert that a Fingerprint and a KeyID are equal, because distinct fingerprints may have the same KeyID, and PartialEq must be transitive, i.e.,

a == b and b == c implies a == c.

That is, if fpr1 and fpr2 are distinct fingerprints with the same key ID then:

fpr1 == keyid and fpr2 == keyid, but fpr1 != fpr2.

In these cases (and only these cases) KeyHandle's PartialOrd implementation returns None to correctly indicate that a comparison is not possible.

This definition of equality makes searching for a given KeyHandle using PartialEq awkward. This function fills that gap. It answers the question: given two KeyHandles, could they be aliases? That is, it implements the desired, non-transitive equality relation:

// fpr1 and fpr2 are different fingerprints with the same KeyID.
assert!(! fpr1.eq(&fpr2));
assert!(fpr1.aliases(&keyid));
assert!(fpr2.aliases(&keyid));
assert!(! fpr1.aliases(&fpr2));

Trait Implementations

impl Clone for KeyHandle

fn clone(&self) -> KeyHandle

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for KeyHandle

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Display for KeyHandle

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'_> From<&'_ Fingerprint> for KeyHandle

fn from(i: &Fingerprint) -> Self

Performs the conversion.

impl<'_> From<&'_ KeyHandle> for KeyID

fn from(i: &KeyHandle) -> Self

Performs the conversion.

impl<'_> From<&'_ KeyID> for KeyHandle

fn from(i: &KeyID) -> Self

Performs the conversion.

impl From<Fingerprint> for KeyHandle

fn from(i: Fingerprint) -> Self

Performs the conversion.

impl From<KeyHandle> for KeyID

fn from(i: KeyHandle) -> Self

Performs the conversion.

impl From<KeyID> for KeyHandle

fn from(i: KeyID) -> Self

Performs the conversion.

impl LowerHex for KeyHandle

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl PartialEq<KeyHandle> for KeyHandle

fn eq(&self, other: &Self) -> bool

This method tests for self and other values to be equal, and is used by ==.

#[must_use]fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl PartialOrd<KeyHandle> for KeyHandle

fn partial_cmp(&self, other: &KeyHandle) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

#[must_use]fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator.

#[must_use]fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator.

#[must_use]fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator.

#[must_use]fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl<'_> TryFrom<&'_ KeyHandle> for Fingerprint

type Error = Error

The type returned in the event of a conversion error.

fn try_from(i: &KeyHandle) -> Result<Self>

Performs the conversion.

impl TryFrom<KeyHandle> for Fingerprint

type Error = Error

The type returned in the event of a conversion error.

fn try_from(i: KeyHandle) -> Result<Self>

Performs the conversion.

impl UpperHex for KeyHandle

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.