MSR JavaScript Cryptography Library

msrCrypto is a JavaScript cryptography library, originally developed by Microsoft Research and subsequently maintained by Kevlened. It serves as a polyfill for the W3C Web Cryptography API, enabling modern cryptographic primitives like RSA-OAEP, AES-CBC, SHA-256/384/512, HMAC, ECDH, and ECDSA in environments where native Web Crypto API support is absent or inconsistent. Its primary differentiation is its broad browser compatibility, extending to older browsers like Internet Explorer 8, 9, 10, and 11, alongside modern browsers. Since version 1.4, it has adopted a Promise-based API for asynchronous operations, aligning with the Web Crypto API specification. The current stable version, as per the user's input, is 1.5.8, though a `1.6.5` version appears on npm under `@dashdot/msrcrypto` with the last publish 4 years ago, and `1.5.8` itself was published 6 years ago. Its release cadence appears infrequent, with updates primarily addressing API compliance, security bug fixes, and feature enhancements for specific algorithms.