jsrsasign is a pure JavaScript cryptography library that provides signing, validation, and certificate handling capabilities.
The library addresses the need for cryptographic operations in JavaScript environments without external dependencies. It implements RSA, ECDSA, and DSA signing and validation, handles ASN.1 structures, manages PKCS#1/5/8 private and public keys, processes X.509 certificates, and supports standards like CMS SignedData, OCSP, CRL, TimeStamp, CAdES, and JSON Web Signature and Token formats. All operations run in pure JavaScript, making it portable across browsers and Node.js environments.
Developers should be aware that the project has announced end of support. The library suits projects requiring cryptographic operations in JavaScript where external native libraries are impractical or undesirable. It is particularly useful for certificate handling, signature generation and verification, and standards-based cryptographic workflows. The project is undergoing modernization in upcoming releases, moving away from legacy JavaScript patterns toward modern ECMAScript features, introducing W3C Web Crypto API support, and modularizing the previously monolithic codebase.
Development activity shows ongoing maintenance with pull request contributions welcomed. The project is transitioning its tooling and architecture substantially, discontinuing support for older platforms like Internet Explorer and package managers like bower, while adopting modern build tools, test frameworks, and module systems. The codebase is being refactored to use contemporary JavaScript patterns including Promise, let declarations, and class syntax.
