@oslojs/asn1

Documentation: https://asn1.oslojs.dev

A JavaScript library for encoding and decoding ASN.1 with Distinguished Encoding Rules (DER) by Oslo.

• Runtime-agnostic
• No third-party dependencies
• Fully typed

import { parseASN1NoLeftoverBytes } from "@oslojs/asn1";

const parsed = parseASN1NoLeftoverBytes(encoded);
const oid = parsed.sequence().at(0).objectIdentifier();
if (!oid.is("1.2.840.10045.4.3.2")) {
    throw new Error("Invalid OID");
}

This library only supports DER and not CER or BER.

Installation

npm i @oslojs/asn1

@oslojs/asn1

1.0.0

• No changes.

0.2.3

• Update dependencies.

0.2.2

• Add missing error messages.

0.2.1

• Add stricter parameter checks in ASN1BitString

0.2.0

• [Breaking] Replace decodeASN1() with parseASN1()
• Add ASN1Value and ASN1Encodable

0.1.3

• Update dependencies.

0.1.2

• Replace const enum with enum

0.1.1

• Fix issue where ASN1Sequence and ASN1Set were tagged as primitive