# kjur/jsrsasign

CAUTION: END OF SUPPORT ON 14 AUG 2026. The 'jsrsasign' (RSA-Sign JavaScript Library) is an opensource free cryptography library supporting RSA/RSAPSS/ECDSA/DSA signing/validation, ASN.1, PKCS#1/5/8 private/public key, X.509 certificate, CRL, OCSP, CMS SignedData, TimeStamp, CAdES and JSON Web Signature/Token in pure JavaScript.

Repository: https://github.com/kjur/jsrsasign
Canonical: https://ross.abutalabs.com/products/jsrsasign
Homepage: https://kjur.github.io/jsrsasign
Language: HTML
License: NOASSERTION
License Family: other
Topics: asn1, x509, certificate, crl, ocsp, timestamp, cms, rsa, dsa, ecdsa, aes, 3des, sha1, sha2, signature, encryption, decryption
Last push: 2026-08-19T01:22:52+00:00

## Health v2 (maintenance only)
Score: 94/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 98, release rhythm 86, longevity 100
- inputs: {"age_days": 5238, "days_push": 15, "days_rel": 19, "gap_med": 61.0, "n_releases_24m": 3}
- flags: no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 3373, forks 652 (observed 2026-08-28T04:07:58.448283+00:00)

## What it is
jsrsasign is a pure JavaScript cryptography library supporting RSA/RSAPSS/ECDSA/DSA signing and validation, ASN.1, PKCS key formats, X.509 certificates, CRL, OCSP, CMS SignedData, TimeStamp, CAdES, and JSON Web Signature/Token/Key. It has reached end of support as of 14 Aug 2026 and its npm packages are deprecated.

## Use cases
- sign and verify data with RSA or ECDSA in JavaScript
- parse X.509 certificates in the browser
- generate and validate JWTs and JWS without a backend
- encode and parse ASN.1 structures
- load PEM-formatted PKCS#1/5/8 private and public keys
- generate CSR and X.509 certificate structures in JavaScript

## When to choose
- you need pure-JavaScript crypto for legacy environments without Web Crypto API
- you must parse or generate X.509, CMS, or ASN.1 structures in JavaScript
- you are maintaining an existing project already built on jsrsasign

## When to avoid
- you are starting a new project - the library is end-of-support with unfixed reported vulnerabilities
- you need maintained, security-audited cryptography
- your environment supports the standard Web Crypto API

## Facets
- artifact type: library
- maturity: abandoned
- function: cryptography, security, serialization, parser
- domain: security, developer-tools, web-development
- platform: browser, cross-platform
- tags: javascript, rsa, ecdsa, x509, asn1, jwt, jws, pkcs, cms, ocsp, end-of-support, nodejs

## Member repositories
- kjur/jsrsasign (main) score 94

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:07:58.448283+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T18:39:56.324285+00:00, confidence not recorded.
  - readme: https://github.com/kjur/jsrsasign (fetched 2026-08-28T04:07:58.448283+00:00, sha 4a4170a91373)
  - homepage: https://kjur.github.io/jsrsasign (fetched 2026-08-29T09:33:28.063851+00:00, sha d53bbf34b743)
- Data as of 2026-08-30T08:39:29.467469+00:00.