[−][src]Struct sequoia_openpgp::packet::signature::subpacket::Subpacket
Signature subpackets.
Most of a signature's attributes are not stored in fixed fields,
but in so-called subpackets. These subpackets are stored in a
Signature
's so-called subpacket areas, which are effectively
small key-value stores. The keys are subpacket tags
(SubpacketTag
). The values are well-structured
(SubpacketValue
).
In addition to their key and value, subpackets also include a critical flag. When set, this flag indicates to the OpenPGP implementation that if it doesn't understand the subpacket, it must consider the signature to be invalid. (Likewise, if it isn't set, then it means that it is safe for the implementation to ignore the subpacket.) This enables forward compatibility with security-relevant extensions.
It is possible to control how Sequoia's higher-level functionality
handles unknown, critical subpackets using a Policy
object.
Depending on the degree of control required, it may be sufficient
to customize a StandardPolicy
object using, for instance, the
StandardPolicy::accept_critical_subpacket
method.
The subpacket system is extensible in two ways. First, although
limited, the subpacket name space is not exhausted. So, it is
possible to introduce new packets. Second, one of the subpackets,
the Notation Data
subpacket (NotationData
), is explicitly
designed for adding arbitrary data to signatures.
Subpackets are described in Section 5.2.3.1 of RFC 4880.
Implementations
impl Subpacket
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pub fn new(value: SubpacketValue, critical: bool) -> Result<Subpacket>
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Creates a new Subpacket.
pub fn critical(&self) -> bool
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Returns whether the critical bit is set.
pub fn tag(&self) -> SubpacketTag
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Returns the Subpacket's tag.
pub fn value(&self) -> &SubpacketValue
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Returns the Subpacket's value.
Trait Implementations
impl Clone for Subpacket
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impl Debug for Subpacket
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impl Eq for Subpacket
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impl Hash for Subpacket
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fn hash<__H: Hasher>(&self, state: &mut __H)
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fn hash_slice<H>(data: &[Self], state: &mut H) where
H: Hasher,
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H: Hasher,
impl Marshal for Subpacket
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fn serialize(&self, o: &mut dyn Write) -> Result<()>
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fn export(&self, o: &mut dyn Write) -> Result<()>
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impl MarshalInto for Subpacket
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fn serialized_len(&self) -> usize
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fn serialize_into(&self, buf: &mut [u8]) -> Result<usize>
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fn to_vec(&self) -> Result<Vec<u8>>
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fn export_into(&self, buf: &mut [u8]) -> Result<usize>
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fn export_to_vec(&self) -> Result<Vec<u8>>
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impl PartialEq<Subpacket> for Subpacket
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impl StructuralEq for Subpacket
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impl StructuralPartialEq for Subpacket
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Auto Trait Implementations
impl RefUnwindSafe for Subpacket
impl Send for Subpacket
impl Sync for Subpacket
impl Unpin for Subpacket
impl UnwindSafe for Subpacket
Blanket Implementations
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
fn borrow_mut(&mut self) -> &mut T
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impl<T> DynClone for T where
T: Clone,
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T: Clone,
impl<T> From<T> for T
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T> ToOwned for T where
T: Clone,
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T: Clone,
type Owned = T
The resulting type after obtaining ownership.
fn to_owned(&self) -> T
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fn clone_into(&self, target: &mut T)
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impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,