Struct sequoia_openpgp::packet::user_attribute::UserAttribute [−][src]
pub struct UserAttribute { /* fields omitted */ }
Expand description
Holds a UserAttribute packet.
See Section 5.12 of RFC 4880 for details.
Implementations
Returns a new UserAttribute
packet.
Note: a valid UserAttribute has at least one subpacket.
The security requirements of the hash algorithm for self-signatures.
A cryptographic hash algorithm usually has three security properties: pre-image resistance, second pre-image resistance, and collision resistance. If an attacker can influence the signed data, then the hash algorithm needs to have both second pre-image resistance, and collision resistance. If not, second pre-image resistance is sufficient.
In general, an attacker may be able to influence third-party signatures. But direct key signatures, and binding signatures are only over data fully determined by signer. And, an attacker’s control over self signatures over User IDs is limited due to their structure.
These observations can be used to extend the life of a hash algorithm after its collision resistance has been partially compromised, but not completely broken. For more details, please refer to the documentation for HashAlgoSecurity.
Gets the user attribute packet’s raw, unparsed value.
Most likely you will want to use subpackets()
to iterate
over the subpackets.
Gets a mutable reference to the user attribute packet’s raw value.
pub fn subpackets(&self) -> SubpacketIterator<'_>ⓘNotable traits for SubpacketIterator<'a>
impl<'a> Iterator for SubpacketIterator<'a> type Item = Result<Subpacket>;
[src]
pub fn subpackets(&self) -> SubpacketIterator<'_>ⓘNotable traits for SubpacketIterator<'a>
impl<'a> Iterator for SubpacketIterator<'a> type Item = Result<Subpacket>;
[src]Iterates over the subpackets.
Creates a binding signature.
The signature binds this user attribute to cert
. signer
will be used to create a signature using signature
as
builder. Thehash_algo
defaults to SHA512, creation_time
to the current time.
This function adds a creation time subpacket, a issuer fingerprint subpacket, and a issuer subpacket to the signature.
Examples
This example demonstrates how to bind this user attribute to a
Cert. Note that in general, the CertBuilder
is a better way
to add userids to a Cert.
// Generate a Cert, and create a keypair from the primary key. let (cert, _) = CertBuilder::new() .generate()?; let mut keypair = cert.primary_key().key().clone() .parts_into_secret()?.into_keypair()?; assert_eq!(cert.userids().len(), 0); // Generate a user attribute and a binding signature. let user_attr = UserAttribute::new(&[ Subpacket::Image( Image::Private(100, vec![0, 1, 2].into_boxed_slice())), ])?; let builder = signature::SignatureBuilder::new(SignatureType::PositiveCertification); let binding = user_attr.bind(&mut keypair, &cert, builder)?; // Now merge the user attribute and binding signature into the Cert. let cert = cert.insert_packets(vec![Packet::from(user_attr), binding.into()])?; // Check that we have a user attribute. assert_eq!(cert.user_attributes().count(), 1);
pub fn certify<S, H, T>(
&self,
signer: &mut dyn Signer,
cert: &Cert,
signature_type: S,
hash_algo: H,
creation_time: T
) -> Result<Signature> where
S: Into<Option<SignatureType>>,
H: Into<Option<HashAlgorithm>>,
T: Into<Option<SystemTime>>,
[src]
pub fn certify<S, H, T>(
&self,
signer: &mut dyn Signer,
cert: &Cert,
signature_type: S,
hash_algo: H,
creation_time: T
) -> Result<Signature> where
S: Into<Option<SignatureType>>,
H: Into<Option<HashAlgorithm>>,
T: Into<Option<SystemTime>>,
[src]Returns a certification for the user attribute.
The signature binds this user attribute to cert
. signer
will be
used to create a certification signature of type
signature_type
. signature_type
defaults to
SignatureType::GenericCertification
, hash_algo
to SHA512,
creation_time
to the current time.
This function adds a creation time subpacket, a issuer fingerprint subpacket, and a issuer subpacket to the signature.
Errors
Returns Error::InvalidArgument
if signature_type
is not
one of SignatureType::{Generic, Persona, Casual, Positive}Certification
Examples
This example demonstrates how to certify a userid.
// Generate a Cert, and create a keypair from the primary key. let (alice, _) = CertBuilder::new() .add_userid("alice@example.org") .generate()?; let mut keypair = alice.primary_key().key().clone() .parts_into_secret()?.into_keypair()?; // Generate a Cert for Bob. let user_attr = UserAttribute::new(&[ Subpacket::Image( Image::Private(100, vec![0, 1, 2].into_boxed_slice())), ])?; let (bob, _) = CertBuilder::new() .set_primary_key_flags(KeyFlags::empty().set_certification()) .add_user_attribute(user_attr) .generate()?; // Alice now certifies the binding between `bob@example.org` and `bob`. let certification = bob.user_attributes().nth(0).unwrap() .certify(&mut keypair, &bob, SignatureType::PositiveCertification, None, None)?; // `certification` can now be used, e.g. by merging it into `bob`. let bob = bob.insert_packets(certification)?; // Check that we have a certification on the userid. assert_eq!(bob.user_attributes().nth(0).unwrap() .certifications().count(), 1);
Trait Implementations
Performs the conversion.
Implement IntoIterator
so that
cert::insert_packets(sig)
just works.
type Item = UserAttribute
type Item = UserAttribute
The type of the elements being iterated over.
type IntoIter = Once<UserAttribute>
type IntoIter = Once<UserAttribute>
Which kind of iterator are we turning this into?
Reads from the given reader.
This method tests for self
and other
values to be equal, and is used
by ==
. Read more
This method tests for !=
.
This method returns an ordering between self
and other
values if one exists. Read more
This method tests less than (for self
and other
) and is used by the <
operator. Read more
This method tests less than or equal to (for self
and other
) and is used by the <=
operator. Read more
This method tests greater than (for self
and other
) and is used by the >
operator. Read more
Auto Trait Implementations
impl RefUnwindSafe for UserAttribute
impl Send for UserAttribute
impl Sync for UserAttribute
impl Unpin for UserAttribute
impl UnwindSafe for UserAttribute
Blanket Implementations
Mutably borrows from an owned value. Read more
type Output = T
type Output = T
Should always be Self