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.

A Note on Equality

Like other data types, two KeyHandles are considered equal if their serialized forms are the same. That is, if you compare a key handle that contains a Fingerprint, and a key handle that contains a KeyID, they will not be considered equal even if the key ID aliases the fingerprint. If you want to check for aliasing, you should use KeyHandle::aliases.

Examples

use openpgp::KeyHandle;
use openpgp::KeyID;
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);
    let kh: KeyHandle
        = "C03F A641 1B03 AE12 5764  6118 7223 B566 78E0 2528".parse()?;
    assert!(&issuers[0].aliases(&kh));
    assert!(&issuers[1].aliases(&kh));
} 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.

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));

pub fn is_invalid(&self) -> bool

Returns whether the KeyHandle is invalid.

A KeyHandle is invalid if the Fingerprint or KeyID that it contains is invalid.

use sequoia_openpgp as openpgp;
use openpgp::Fingerprint;
use openpgp::KeyID;
use openpgp::KeyHandle;

// A perfectly valid fingerprint:
let kh : KeyHandle = "8F17 7771 18A3 3DDA 9BA4  8E62 AACB 3243 6300 52D9"
    .parse()?;
assert!(! kh.is_invalid());

// But, V3 fingerprints are invalid.
let kh : KeyHandle = "9E 94 45 13 39 83 5F 70 7B E7 D8 ED C4 BE 5A A6"
    .parse()?;
assert!(kh.is_invalid());

// A perfectly valid Key ID:
let kh : KeyHandle = "AACB 3243 6300 52D9"
    .parse()?;
assert!(! kh.is_invalid());

// But, short Key IDs are invalid:
let kh : KeyHandle = "6300 52D9"
    .parse()?;
assert!(kh.is_invalid());

pub fn to_hex(&self) -> String

Converts this KeyHandle to its canonical hexadecimal representation.

This representation is always uppercase and without spaces and is suitable for stable key identifiers.

The output of this function is exactly the same as formatting this object with the :X format specifier.

use openpgp::KeyHandle;

let h: KeyHandle =
    "0123 4567 89AB CDEF 0123 4567 89AB CDEF 0123 4567".parse()?;

assert_eq!("0123456789ABCDEF0123456789ABCDEF01234567", h.to_hex());
assert_eq!(format!("{:X}", h), h.to_hex());

pub fn to_spaced_hex(&self) -> String

Converts this KeyHandle to its hexadecimal representation with spaces.

This representation is always uppercase and with spaces grouping the hexadecimal digits into groups of four. It is only suitable for manual comparison of key handles.

Note: The spaces will hinder other kind of use cases. For example, it is harder to select the whole key handle for copying, and it has to be quoted when used as a command line argument. Only use this form for displaying a key handle with the intent of manual comparisons.

use openpgp::KeyHandle;

let h: KeyHandle =
    "0123 4567 89AB CDEF 0123 4567 89AB CDEF 0123 4567".parse()?;

assert_eq!("0123 4567 89AB CDEF 0123  4567 89AB CDEF 0123 4567",
           h.to_spaced_hex());

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

Converts to this type from the input type.

impl From<&KeyHandle> for KeyID

fn from(i: &KeyHandle) -> Self

Converts to this type from the input type.

impl From<&KeyID> for KeyHandle

fn from(i: &KeyID) -> Self

Converts to this type from the input type.

impl From<Fingerprint> for KeyHandle

fn from(i: Fingerprint) -> Self

Converts to this type from the input type.

impl From<KeyHandle> for KeyID

fn from(i: KeyHandle) -> Self

Converts to this type from the input type.

impl From<KeyID> for KeyHandle

fn from(i: KeyID) -> Self

Converts to this type from the input type.

impl FromStr for KeyHandle

type Err = Error

The associated error which can be returned from parsing.

fn from_str(s: &str) -> Result<Self, Self::Err>

Parses a string s to return a value of this type.

impl LowerHex for KeyHandle

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

Formats the value using the given formatter.

impl PartialEq for KeyHandle

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

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

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for KeyHandle

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

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

fn lt(&self, other: &Rhs) -> bool

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

fn le(&self, other: &Rhs) -> bool

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

fn gt(&self, other: &Rhs) -> bool

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

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.