Crate tsumiki_der 

tsumiki-der

DER (Distinguished Encoding Rules) parsing and encoding.

This crate implements DER encoding as defined in ITU-T X.690.

What is DER?

DER is a binary encoding format for ASN.1 data structures. It uses a Tag-Length-Value (TLV) structure where:

• Tag: Identifies the data type (INTEGER, SEQUENCE, etc.)
• Length: The size of the value in bytes
• Value: The actual data

Example

use tsumiki::decoder::Decoder;
use tsumiki_der::Der;

// DER-encoded SEQUENCE with one INTEGER (value 42)
let bytes = vec![0x30, 0x03, 0x02, 0x01, 0x2a];

// Parse DER
let der: Der = bytes.decode()?;

assert_eq!(der.elements().len(), 1);

Encoding

use tsumiki::encoder::Encoder;
use tsumiki_der::{Der, Tlv, Tag, PrimitiveTag};

// Create DER structure
let tlv = Tlv::new_primitive(Tag::Primitive(PrimitiveTag::Integer, 0x02), vec![0x2a]);
let der = Der::new(vec![tlv]);

// Encode to bytes
let bytes: Vec<u8> = der.encode()?;

Modules

error

Error types for DER parsing and encoding operations.

Structs

Der

Represents a DER (Distinguished Encoding Rules) encoded structure.

Tlv

Tag-Length-Value structure representing a single DER element.

Enums

PrimitiveTag

Primitive ASN.1 tag types.

Tag

Represents a DER tag that identifies the type of data in a TLV structure.

Constants

TAG_CONSTRUCTED

Tag byte constructed flag (bit 5).