Struct sequoia_openpgp::cert::prelude::UserIDRevocationBuilder

pub struct UserIDRevocationBuilder { /* fields omitted */ }

A builder for revocation certificates for User ID.

A revocation certificate for a User ID has three degrees of freedom: the certificate, the key used to generate the revocation certificate, and the User ID being revoked.

Normally, the key used to sign the revocation certificate is the certificate’s primary key, and the User ID is a User ID that is bound to the certificate. However, this is not required. For instance, if Alice has marked Robert’s certificate (R) as a designated revoker for her certificate (A), then R can revoke A or parts of A. In such a case, the certificate is A, the key used to sign the revocation certificate comes from R, and the User ID being revoked is bound to A.

But, the User ID doesn’t technically need to be bound to the certificate either. For instance, it is technically possible for R to create a revocation certificate for a User ID in the context of A, even if that User ID is not bound to A. Semantically, such a revocation certificate is currently meaningless.

Examples

Revoke a User ID that is no longer valid:

use sequoia_openpgp as openpgp;
use openpgp::cert::prelude::*;
use openpgp::policy::StandardPolicy;
use openpgp::types::ReasonForRevocation;
use openpgp::types::RevocationStatus;
use openpgp::types::SignatureType;

let p = &StandardPolicy::new();

// Create and sign a revocation certificate.
let mut signer = cert.primary_key().key().clone()
    .parts_into_secret()?.into_keypair()?;
let ua = cert.userids().nth(0).unwrap();
let sig = UserIDRevocationBuilder::new()
    .set_reason_for_revocation(ReasonForRevocation::UIDRetired,
                               b"Left example.org.")?
    .build(&mut signer, &cert, ua.userid(), None)?;

// Merge it into the certificate.
let cert = cert.insert_packets(sig.clone())?;

// Now it's revoked.
let ua = cert.userids().nth(0).unwrap();
if let RevocationStatus::Revoked(revocations) = ua.revocation_status(p, None) {
    assert_eq!(revocations.len(), 1);
    assert_eq!(*revocations[0], sig);
} else {
    panic!("User ID is not revoked.");
}

// But the certificate isn't.
assert_eq!(RevocationStatus::NotAsFarAsWeKnow,
           cert.revocation_status(p, None));

Implementations

impl UserIDRevocationBuilder

pub fn new() -> Self

Returns a new UserIDRevocationBuilder.

Examples

use sequoia_openpgp as openpgp;
use openpgp::cert::prelude::*;

let builder = UserIDRevocationBuilder::new();

pub fn set_reason_for_revocation(
    self,
    code: ReasonForRevocation,
    reason: &[u8]
) -> Result<Self>

Sets the reason for revocation.

Note: of the assigned reasons for revocation, only ReasonForRevocation::UIDRetired is appropriate for User IDs. This parameter is not fixed, however, to allow the use of the private name space.

Examples

Revoke a User ID that is no longer valid:

use sequoia_openpgp as openpgp;
use openpgp::cert::prelude::*;
use openpgp::types::ReasonForRevocation;

let builder = UserIDRevocationBuilder::new()
    .set_reason_for_revocation(ReasonForRevocation::UIDRetired,
                               b"Left example.org.");

pub fn set_signature_creation_time(
    self,
    creation_time: SystemTime
) -> Result<Self>

Sets the revocation certificate’s creation time.

The creation time is interpreted as the time at which the User ID should be considered revoked.

You’ll usually want to set this explicitly and not use the current time. In particular, if a User ID is retired, you’ll want to set this to the time when the User ID was actually retired.

Examples

Create a revocation certificate for a User ID that was retired yesterday:

use sequoia_openpgp as openpgp;
use openpgp::cert::prelude::*;

let builder = UserIDRevocationBuilder::new()
    .set_signature_creation_time(yesterday);

pub fn build<H>(
    self,
    signer: &mut dyn Signer,
    cert: &Cert,
    userid: &UserID,
    hash_algo: H
) -> Result<Signature> where
    H: Into<Option<HashAlgorithm>>, 

Returns a signed revocation certificate.

A revocation certificate is generated for cert and userid and signed using signer with the specified hash algorithm. Normally, you should pass None to select the default hash algorithm.

Examples

Revoke a User ID, because the user has left the organization:

use sequoia_openpgp as openpgp;
use openpgp::cert::prelude::*;
use openpgp::policy::StandardPolicy;
use openpgp::types::ReasonForRevocation;

let p = &StandardPolicy::new();

// Create and sign a revocation certificate.
let mut signer = cert.primary_key().key().clone()
    .parts_into_secret()?.into_keypair()?;
let ua = cert.userids().nth(0).unwrap();
let sig = UserIDRevocationBuilder::new()
    .set_reason_for_revocation(ReasonForRevocation::UIDRetired,
                               b"Left example.org.")?
    .build(&mut signer, &cert, ua.userid(), None)?;

Methods from Deref<Target = SignatureBuilder>

Trait Implementations

impl Deref for UserIDRevocationBuilder

type Target = SignatureBuilder

The resulting type after dereferencing.

fn deref(&self) -> &Self::Target

Dereferences the value.

impl TryFrom<SignatureBuilder> for UserIDRevocationBuilder

type Error = Error

The type returned in the event of a conversion error.

fn try_from(builder: SignatureBuilder) -> Result<Self>

Performs the conversion.