Product
Introducing Enhanced Alert Actions and Triage Functionality
Socket now supports four distinct alert actions instead of the previous two, and alert triaging allows users to override the actions taken for all individual alerts.
@peculiar/asn1-schema
Advanced tools
Readme
@peculiar/asn1-schema
This package uses ES2015 decorators to simplify working with ASN.1 creation and parsing.
Abstract Syntax Notation One (ASN.1) is a standard interface description language for defining data structures that can be serialized and deserialized in a cross-platform way. Working with ASN.1 can be complicated as there are many ways to represent the same data and many solutions handcraft, incorrectly, the ASN.1 representation of the data.
asn1-schema
addresses this by using decorators to make both serialization and parsing of ASN.1 possible via a simple class that handles these problems for you.
This is important because validating input data before its use is important to do because all input data is evil.
Installation is handled via npm
:
$ npm install @peculiar/asn1-schema
Node.js:
ASN.1 schema
Extension ::= SEQUENCE {
extnID OBJECT IDENTIFIER,
critical BOOLEAN DEFAULT FALSE,
extnValue OCTET STRING
-- contains the DER encoding of an ASN.1 value
-- corresponding to the extension type identified
-- by extnID
}
id-ce-basicConstraints OBJECT IDENTIFIER ::= { id-ce 19 }
BasicConstraints ::= SEQUENCE {
cA BOOLEAN DEFAULT FALSE,
pathLenConstraint INTEGER (0..MAX) OPTIONAL
}
ASN.1 schema declaration in TypeScript project
import { Asn1Prop, Asn1PropTypes, Asn1Serializer } from "@peculiar/asn1-schema";
class Extension {
public static CRITICAL = false;
@AsnProp({ type: Asn1PropTypes.ObjectIdentifier })
public extnID: string = "";
@AsnProp({
type: Asn1PropTypes.Boolean,
defaultValue: Extension.CRITICAL,
})
public critical = Extension.CRITICAL;
@AsnProp({ type: Asn1PropTypes.OctetString })
public extnValue: ArrayBuffer = new ArrayBuffer(0);
}
class BasicConstraints {
@AsnProp({ type: Asn1PropTypes.Boolean, defaultValue: false })
public ca = false;
@AsnProp({ type: Asn1PropTypes.Integer, optional: true })
public pathLenConstraint?: number;
}
Encoding ASN.1 data
const basicConstraints = new BasicConstraints();
basicConstraints.ca = true;
basicConstraints.pathLenConstraint = 1;
const extension = new Extension();
extension.critical = true;
extension.extnID = "2.5.29.19";
extension.extnValue = AsnSerializer.serialize(basicConstraints);
console.log(Buffer.from(AsnSerializer.serialize(extension)).toString("hex")); // 30120603551d130101ff040830060101ff020101
Decoding ASN.1 data
const extension = AsnParser.parse(Buffer.from("30120603551d130101ff040830060101ff020101", "hex"), Extension);
console.log("Extension ID:", extension.extnID); // Extension ID: 2.5.29.19
console.log("Critical:", extension.critical); // Critical: true
const basicConstraints = AsnParser.parse(extension.extnValue, BasicConstraints);
console.log("CA:", basicConstraints.ca); // CA: true
console.log("Path length:", basicConstraints.pathLenConstraint); // Path length: 1
FAQs
Decorators for ASN.1 schemas building
The npm package @peculiar/asn1-schema receives a total of 3,171,291 weekly downloads. As such, @peculiar/asn1-schema popularity was classified as popular.
We found that @peculiar/asn1-schema demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 6 open source maintainers collaborating on the project.
Did you know?
Socket for GitHub automatically highlights issues in each pull request and monitors the health of all your open source dependencies. Discover the contents of your packages and block harmful activity before you install or update your dependencies.
Product
Socket now supports four distinct alert actions instead of the previous two, and alert triaging allows users to override the actions taken for all individual alerts.
Security News
Polyfill.io has been serving malware for months via its CDN, after the project's open source maintainer sold the service to a company based in China.
Security News
OpenSSF is warning open source maintainers to stay vigilant against reputation farming on GitHub, where users artificially inflate their status by manipulating interactions on closed issues and PRs.