@deckyard/sealbox

One-call encryption formats for Jennifer, on top of its crypto library: sealed boxes (AES-256-GCM with the nonce stored in front), encrypt-then-MAC (AES-CBC + HMAC-SHA256), and Fernet tokens compatible with Python's cryptography.fernet. The caller never handles a nonce, an IV or a MAC, and every failure to open is one error that does not say which check failed.

Documentation

Install

jvc add @deckyard/sealbox

This vendors the deck to vendor/<scope>/sealbox/. Without jvc, unpack the src/ subtree of a release archive (<scope>-sealbox-<version>.tar.gz) there.

Usage

use convert;
import "@deckyard/sealbox/" as sealbox;

def key as bytes init sealbox.newKey();
def box as bytes init sealbox.seal(convert.bytesFromString("utf-8", "secret"), $key);
def back as bytes init sealbox.open($box, $key);

Requirements

Jennifer 0.26.0 or newer. Pure computation: no network, programs or databases, so it runs on jennifer-tiny too.

Development

tools/check-all.sh                   # the full gate, as CI runs it
jennifer test src/sealbox_test.j      # the test overlay
tools/check-docs.sh                  # docs against the code
tools/pack.sh dist                   # build the release archive

Licence

LGPL-3.0-only, see LICENSE. Copyright (C) 2026 mplx <mplx@jennifer-lang.dev>.

tools/check-headers.sh checks every source file's SPDX header against deck.toml.