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@dottedice/x509-asn1-builder

Zero-dependency ASN.1 DER (Distinguished Encoding Rules) serializer for JavaScript, Web Cryptography API, and X.509 certificate packaging.

Installation

npm install @dottedice/x509-asn1-builder

Features

• Zero Dependencies: Pure vanilla JavaScript module.
• DER Primitive Encoding: Serializes Sequence, Set, Integer, OID, BitString, OctetString, UTCTime, PrintableString, and UTF8String.
• X.509 Struct Generation: Standard compliant TLV (Tag-Length-Value) generators for TBSCertificate (RFC 5280) and raw DER certificate construction.

API Reference

Primitive DER Encoders

• derInteger(value): Encodes numeric values or big serial hex strings.
• derOID(oidStr): Encodes string OIDs (e.g. 1.2.840.113549.1.1.11).
• derUTCTime(date): Formats Date objects to YYMMDDHHMMSSZ format.
• derSequence(arrays) / derSet(arrays): Encodes nested structures.

X.509 Builders

• buildName(attributes): Generates Name directory entries (e.g. commonName, organization).
• buildTBSCertificate(options): Generates To-Be-Signed Certificate payload structure.
• buildX509Certificate(tbsDer, signatureAlgorithmOid, signatureBytes): Wraps TBS payload and computed signature into valid X.509 DER format.