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Leviathan Crypto Library

A zero-dependency WebAssembly cryptography library for TypeScript, featuring the paranoia of Serpent-256 and the elegance of XChaCha20-Poly1305, with SHA-2/3, HMAC, HKDF, and Fortuna CSPRNG included. All cryptographic computation runs in WASM, outside the JavaScript JIT, behind a strictly typed API built on vector-verified primitives.

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Install

npm install leviathan-crypto
# or
bun add leviathan-crypto

No bundler? Load directly from a CDN. See: CDN usage.

Quick Start

import { init, SerpentSeal, XChaCha20Seal, randomBytes } from 'leviathan-crypto'

await init(['serpent', 'sha2', 'chacha20'])

// Serpent-256
const sKey       = randomBytes(64)
const seal       = new SerpentSeal()
const ciphertext = seal.encrypt(sKey, plaintext)
const decrypted  = seal.decrypt(sKey, ciphertext)     // throws on tamper
seal.dispose()

// XChaCha20-Poly1305
const xSeal      = new XChaCha20Seal(randomBytes(32))
const ct         = xSeal.encrypt(plaintext)           // nonce managed internally
const pt         = xSeal.decrypt(ct)                  // throws on tamper
xSeal.dispose()

See examples for streaming, chunking, hashing, key derivation, and both ciphers.

Demos

Name	Link	Code	Docs	Description
lvthn-web	▼	🛈	¶	Encrypt text or files using Serpent-256-CBC and Argon2id key derivation from a single local HTML file, with armored output. No server, installation, or network connection required after initial load.
lvthn-chat	▼	🛈	¶	End-to-end encrypted chat over X25519 key exchange and XChaCha20-Poly1305. Relay server functions as a dumb WebSocket pipe and never sees plaintexts.
lvthn-cli	▼	🛈	¶	File encryption CLI supporting both Serpent-256 and XChaCha20-Poly1305 via --cipher. Keyfiles are compatible across both ciphers; the header byte determines decryption automatically.

Full Documentation Index