Key Engineering Takeaways (TL;DR)

  • Core Premise: Implement AES-GCM client encryption, SHA-256 hashing, and RSA keypair generation directly in the browser with native Web Crypto primitives.
  • Implementation Safety: Zero-dependency, client-first implementation ensuring maximum data privacy and low operational complexity.
  • Production Standard: Adheres to latest 2026 performance benchmarks and strict web security guidelines.
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Zero-Knowledge Client Encryption Without Third-Party Libraries

Modern browser engines include the native window.crypto.subtle API, providing cryptographically secure primitives executed in hardware-accelerated C++ without external npm dependencies like CryptoJS.

// Generate a 256-bit AES-GCM cryptographic key
async function generateKey() {
    return await window.crypto.subtle.generateKey(
        { name: 'AES-GCM', length: 256 },
        true,
        ['encrypt', 'decrypt']
    );
}