High-throughput, zero-dependency cryptographic workbench executing natively inside your browser engine via the W3C Web Cryptography API (window.crypto.subtle).
All digests, authenticated ciphers, file checksums, and key derivations run strictly inside local non-persistent memory with zero server transit, zero external scripts, and zero telemetry.
Deterministic one-way compression functions mapping arbitrary-length byte streams into fixed-length message digests. Computed asynchronously via OS-backed cryptographic providers.
Verify software binaries, ISO images, and archive checksums directly inside browser RAM. Files are read locally via the HTML5 FileReader interface and never uploaded over the network.
Generate cryptographic authentication tags for webhook verification, JWT signing, and API request authentication using a secret symmetric signing key.
Authenticated Encryption with Associated Data (AEAD) combining 256-bit AES in Galois/Counter Mode with a 128-bit GHASH authentication tag. Passphrases are stretched via 100,000 iterations of PBKDF2-HMAC-SHA256 with a fresh 16-byte salt and 12-byte IV per execution.
Extract raw cryptographic randomness directly from the operating system kernel entropy pool (/dev/urandom, getrandom(2), or Windows CNG via crypto.getRandomValues). Never uses predictable user-space PRNGs like Math.random().
Inspect and transcode UTF-8 string buffers into hexadecimal byte representations, standard Base64 (RFC 4648 §4), and URL-safe Base64URL (RFC 4648 §5) for JWT and cryptographic header inspection.
Engineering reference detailing primitive parameters, formal security bounds, and browser runtime memory constraints.
| Primitive | Standard / Specification | Block / State Size | Output / Tag Size | Classical Security Bound |
|---|---|---|---|---|
| SHA-256 | NIST FIPS 180-4 / RFC 6234 | 512-bit (64 bytes) | 256-bit (32 bytes) | 128-bit collision / 256-bit preimage |
| SHA-384 | NIST FIPS 180-4 | 1024-bit (128 bytes) | 384-bit (48 bytes) | 192-bit collision / 384-bit preimage |
| SHA-512 | NIST FIPS 180-4 / RFC 6234 | 1024-bit (128 bytes) | 512-bit (64 bytes) | 256-bit collision / 512-bit preimage |
| HMAC-SHA256 | NIST FIPS 198-1 / RFC 2104 | 512-bit internal block | 256-bit (32 bytes) | Up to 256-bit key authentication |
| AES-256-GCM | NIST SP 800-38D / RFC 5116 | 128-bit AES block | Ciphertext + 128-bit Tag | 256-bit confidentiality / 128-bit integrity |
| PBKDF2-SHA256 | PKCS #5 v2.1 / RFC 2898 | 128-bit CSPRNG Salt | 256-bit Derived Key | 100,000 HMAC-SHA256 rounds |
Galois/Counter Mode requires that the 96-bit Initialization Vector (IV/nonce) is never reused under the same key. A single nonce collision permits an attacker to XOR ciphertexts and recover the GHASH authentication key $H$ via polynomial root-finding over $ ext{GF}(2^{128})$. Every encryption call on this node draws a fresh 12-byte IV from the OS CSPRNG.
Human-memorable passphrases lack sufficient bit-entropy to resist offline GPU dictionary attacks directly. Before invoking AES-GCM, user passphrases are salted with 16 random bytes and iterated through 100,000 rounds of PBKDF2-HMAC-SHA256, producing a non-extractable 256-bit CryptoKey handle.
While window.crypto.subtle executes cryptographic math inside compiled C++/Rust browser internals with constant-time guarantees, JavaScript DOM strings are immutable objects on the garbage-collected heap. Explicit memory zeroing (explicit_bzero) is only possible on typed Uint8Array buffers, not on rendered DOM text nodes.
User-space JavaScript cryptography libraries run inside the JIT interpreter, making them slower, susceptible to cache-timing side-channel variations, and vulnerable to supply-chain CDN tampering. By relying strictly on the W3C window.crypto.subtle specification, all primitives execute in native compiled browser code (BoringSSL in Chromium, NSS in Firefox, CoreCrypto in WebKit) backed by CPU hardware instructions (AES-NI and Intel SHA extensions).
To make payloads self-contained and portable, the binary output concatenates three segments prior to Base64 encoding: bytes 0..15 store the 128-bit PBKDF2 salt, bytes 16..27 store the 96-bit AES-GCM initialization vector, and bytes 28..N contain the encrypted ciphertext suffixed with the 128-bit (16-byte) GHASH authentication tag.
Curated directory of independent web engineering tools constructed without third-party frontend frameworks, executing entirely on native browser APIs with zero telemetry overhead.
Statistical modeling interface computing real-time demographic height percentiles, standard normal cumulative distribution functions (CDF), and population z-scores entirely in client memory.
Hardware power-management utility utilizing the native W3C navigator.wakeLock API to prevent OS display dimming or system sleep during long-running compilations and monitoring jobs.
Comprehensive directory of dependency-free browser utilities engineered with raw DOM interfaces, HTML5 Canvas 2D pipelines, and client-side numerical processors.