Enum der::Tag

#[non_exhaustive]
#[repr(u8)]
pub enum Tag {
    Boolean,
    Integer,
    BitString,
    OctetString,
    Null,
    ObjectIdentifier,
    Utf8String,
    Set,
    PrintableString,
    Ia5String,
    UtcTime,
    GeneralizedTime,
    Sequence,
    ContextSpecific0,
    ContextSpecific1,
    ContextSpecific2,
    ContextSpecific3,
}

ASN.1 tags.

Tags are the leading byte of the Tag-Length-Value encoding used by ASN.1 DER and identify the type of the subsequent value.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Boolean

BOOLEAN tag.

Integer

INTEGER tag.

BitString

BIT STRING tag.

OctetString

OCTET STRING tag.

Null

NULL tag.

ObjectIdentifier

OBJECT IDENTIFIER tag.

Utf8String

UTF8String tag.

Set

SET and SET OF tag.

PrintableString

PrintableString tag.

Ia5String

IA5String tag.

UtcTime

UTCTime tag.

GeneralizedTime

GeneralizedTime tag.

Sequence

SEQUENCE tag.

Note that the universal tag number for SEQUENCE is technically 0x10 however we presently only support the constructed form, which has the 6th bit (i.e. 0x20) set.

ContextSpecific0

Context-specific tag (0) unique to a particular structure.

ContextSpecific1

Context-specific tag (1) unique to a particular structure.

ContextSpecific2

Context-specific tag (2) unique to a particular structure.

ContextSpecific3

Context-specific tag (3) unique to a particular structure.

Implementations

impl Tag

pub fn assert_eq(self, expected: Tag) -> Result<Tag>

Assert that this Tag matches the provided expected tag.

On mismatch, returns an Error with ErrorKind::UnexpectedTag.

pub fn type_name(self) -> &'static str

Names of ASN.1 type which corresponds to a given Tag.

Trait Implementations

impl Clone for Tag

fn clone(&self) -> Tag

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Tag

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

Formats the value using the given formatter.

impl Decodable<'_> for Tag

fn decode(decoder: &mut Decoder<'_>) -> Result<Self>

Attempt to decode this message using the provided decoder.

fn from_der(bytes: &'a [u8]) -> Result<Self>

Parse Self from the provided DER-encoded byte slice.

impl Display for Tag

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

Formats the value using the given formatter.

impl Encodable for Tag

fn encoded_len(&self) -> Result<Length>

Compute the length of this value in bytes when encoded as ASN.1 DER.

fn encode(&self, encoder: &mut Encoder<'_>) -> Result<()>

Encode this value as ASN.1 DER using the provided Encoder.

fn encode_to_slice<'a>(&self, buf: &'a mut [u8]) -> Result<&'a [u8]>

Encode this value to the provided byte slice, returning a sub-slice containing the encoded message.

fn encode_to_vec(&self, buf: &mut Vec<u8>) -> Result<Length>

This is supported on crate feature alloc only.

Encode this message as ASN.1 DER, appending it to the provided byte vector.

fn to_vec(&self) -> Result<Vec<u8>>

This is supported on crate feature alloc only.

Serialize this message as a byte vector.

impl Ord for Tag

fn cmp(&self, other: &Tag) -> Ordering

This method returns an Ordering between self and other.

#[must_use]

fn max(self, other: Self) -> Self

Compares and returns the maximum of two values.

#[must_use]

fn min(self, other: Self) -> Self

Compares and returns the minimum of two values.

#[must_use]

fn clamp(self, min: Self, max: Self) -> Self

Restrict a value to a certain interval.

impl PartialEq<Tag> for Tag

fn eq(&self, other: &Tag) -> 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<Tag> for Tag

fn partial_cmp(&self, other: &Tag) -> 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<u8> for Tag

type Error = Error

The type returned in the event of a conversion error.

fn try_from(byte: u8) -> Result<Tag>

Performs the conversion.

impl Copy for Tag

impl Eq for Tag

impl StructuralEq for Tag

impl StructuralPartialEq for Tag