Enum Encoding 

pub enum Encoding {
    Der,
    Ber,
    Cer,
}

ASN.1 encoding rules

Specifies which encoding rules to use when encoding or decoding ASN.1 data. Different encoding rules have different levels of strictness and features.

Variants

Der

Distinguished Encoding Rules (deterministic subset of BER)

DER is a strict subset of BER that ensures deterministic encoding. It is commonly used in cryptographic applications where canonical encoding is required (e.g., X.509 certificates).

Ber

Basic Encoding Rules (most flexible)

BER is the most flexible encoding, allowing multiple ways to encode the same data. It supports indefinite length encoding and other features not available in DER.

Cer

Canonical Encoding Rules (similar to DER but for streaming)

CER is designed for streaming applications where the total length of a value may not be known in advance. The encoding rules are:

• Constructed types whose content exceeds 1 000 bytes must use indefinite-length encoding (terminated by end-of-contents octets 0x00 0x00). Shorter constructed types use definite length.
• Primitive types always use definite-length encoding.
• All other DER constraints (e.g. minimal integer encoding, TRUE=0xFF) remain in force.

CER is rarely used in practice; DER is preferred for certificates and most cryptographic protocols.

Trait Implementations

impl Clone for Encoding

fn clone(&self) -> Encoding

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Encoding

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

Formats the value using the given formatter.

impl PartialEq for Encoding

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

Tests for self and other values to be equal, and is used by ==.

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

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

impl Copy for Encoding

impl Eq for Encoding

impl StructuralPartialEq for Encoding