ed25519_enc

ed25519_enc: A Rust and Node.js library that facilitates secure encryption and decryption by converting Ed25519 keys to X25519 keys. It utilizes elliptic-curve Diffie-Hellman (ECDH) to derive a shared secret, which is then used for symmetric encryption with AES-256-GCM.

This project was bootstrapped by create-neon.

Table of Contents

• NPM usage
  • Installation
  • From ed25519 private key to x25519
  • From ed25519 public key to x25519
  • Encrypt and decrypt data using ed25519 keys
• Cargo usage
  • Installation
  • From ed25519 private key to x25519
  • From ed25519 public key to x25519
  • Encrypt and decrypt data using ed25519 keys
• Building ed25519_enc
• Exploring ed25519_enc
• Available Scripts
  • npm run build
  • npm run debug
  • npm run cross
  • npm run release
  • npm run dryrun
  • npm test
• Project Layout
• Learn More
• LICENSE

Table of contents generated with markdown-toc

NPM usage

Installation

npm i ed25519_enc

From ed25519 private key to x25519

import { to_x25519_priv } from "ed25519_enc";
...
const ed25519_priv = Buffer.from(
  "D12549B4AE46086002E4110B1F94D0BA942C2967AA83D3003590FD7A5087C6A8",
  "hex"
);
const x25519_priv = to_x25519_priv(ed25519_priv);

From ed25519 public key to x25519

import { to_x25519_pub } from "ed25519_enc";
...
const ed25519_pub = Buffer.from(
  "B68F106DAA004E7AE715C5159E1C27CB864EED20D3ACB332BD6F87E89226E925",
  "hex"
);
const x25519_pub = to_x25519_pub(ed25519_pub);

Encrypt and decrypt data using ed25519 keys

import { encrypt } from "ed25519_enc";
...
const sender_priv = Buffer.from(
  "D12549B4AE46086002E4110B1F94D0BA942C2967AA83D3003590FD7A5087C6A8",
  "hex"
);
const sender_pub = Buffer.from(
  "B68F106DAA004E7AE715C5159E1C27CB864EED20D3ACB332BD6F87E89226E925",
  "hex"
);
const receiver_priv = Buffer.from(
  "3C659C3FD72E56861C81C1684C5C342958645E2C459A11A2282B46161E47BF2E",
  "hex"
);
const receiver_pub = Buffer.from(
  "C02ABDA285014F207D5D31219E0F5647484F6DFF09E595DF38BDBDB07CE6E1B2",
  "hex"
);
const data = Buffer.from("Hello world!");
const encrypted_data = encrypt(sender_priv, receiver_pub, data);
const decrypted_data = decrypt(receiver_priv, sender_pub, encrypted_data);

console.log("Decrypted data: ", new TextDecoder().decode(dec_data));
// Decrypted data:  Hello World!

Cargo usage

Installation

cargo add ed25519_enc

From ed25519 private key to x25519

use ed25519_enc::{to_x25519_priv};
...
let ed25519_priv: [u8; 32] = [
  157, 097, 177, 157, 239, 253, 090, 096,
  186, 132, 074, 244, 146, 236, 044, 196,
  068, 073, 197, 105, 123, 050, 105, 025,
  112, 059, 172, 003, 028, 174, 127, 096,
];
let x25519_priv: [u8; 32] = to_x25519_priv(ed25519_priv);

From ed25519 public key to x25519

use ed25519_enc::{to_x25519_pub};
...
let ed25519_pub: [u8; 32] = [
  215, 090, 152, 001, 130, 177, 010, 183,
  213, 075, 254, 211, 201, 100, 007, 058,
  014, 225, 114, 243, 218, 166, 035, 037,
  175, 002, 026, 104, 247, 007, 081, 026,
];
let x25519_pub: [u8; 32] = to_x25519_pub(ed25519_pub);

Encrypt and decrypt data using ed25519 keys

use ed25519_enc::{encrypt, decrypt}

...

let sender_ed25519_priv: [u8; 32] = [
    157, 097, 177, 157, 239, 253, 090, 096,
    186, 132, 074, 244, 146, 236, 044, 196,
    068, 073, 197, 105, 123, 050, 105, 025,
    112, 059, 172, 003, 028, 174, 127, 096,
];

let sender_ed25519_pub: [u8; 32] = [
    215, 090, 152, 001, 130, 177, 010, 183,
    213, 075, 254, 211, 201, 100, 007, 058,
    014, 225, 114, 243, 218, 166, 035, 037,
    175, 002, 026, 104, 247, 007, 081, 026,
];

let receiver_ed25519_priv: [u8; 32] = [
    074, 032, 095, 005, 083, 039, 001, 050,
    066, 088, 090, 056, 021, 011, 031, 011,
    087, 068, 033, 014, 025, 028, 010, 043,
    024, 066, 058, 076, 030, 074, 017, 076,
];

let receiver_ed25519_pub: [u8; 32] = [
    204, 095, 038, 061, 080, 055, 143, 219,
    253, 138, 015, 190, 145, 041, 028, 081,
    001, 004, 227, 080, 197, 078, 000, 043,
    160, 130, 158, 047, 197, 058, 228, 232
];

let data: &[u8] = b"Hello world!";

let enc_msg: Vec<u8> = encrypt(
    sender_ed25519_priv,
    receiver_ed25519_pub,
    data
);

let dec_data: Vec<u8> = decrypt(
    receiver_ed25519_priv,
    sender_ed25519_pub,
    &enc_msg
);

println!("{:?}", dec_data); // should prints "Hello world!"

Building ed25519_enc

Building ed25519_enc requires a supported version of Node and Rust.

To run the build, run:

$ npm run build

This command uses the @neon-rs/cli utility to assemble the binary Node addon from the output of cargo.

Exploring ed25519_enc

After building ed25519_enc, you can explore its exports at the Node console:

$ npm i
$ npm run build
$ node
> const lib = require('.');
> const sender_priv = Buffer.from("D12549B4AE46086002E4110B1F94D0BA942C2967AA83D3003590FD7A5087C6A8", "hex");
> const sender_pub = Buffer.from("B68F106DAA004E7AE715C5159E1C27CB864EED20D3ACB332BD6F87E89226E925", "hex");
> const receiver_priv = Buffer.from("3C659C3FD72E56861C81C1684C5C342958645E2C459A11A2282B46161E47BF2E", "hex");
> const receiver_pub = Buffer.from("C02ABDA285014F207D5D31219E0F5647484F6DFF09E595DF38BDBDB07CE6E1B2", "hex");
> const data = Buffer.from("Hello World!");
> const enc_data = lib.encrypt(sender_priv, receiver_pub, data);
> const dec_data = lib.decrypt(receiver_priv, sender_pub, enc_data);
> console.log("Decrypted data: ", new TextDecoder().decode(dec_data));

Decrypted data:  Hello World!

Available Scripts

In the project directory, you can run:

npm run build

Builds the Node addon (index.node) from source, generating a release build with cargo --release.

Additional cargo build arguments may be passed to npm run build and similar commands. For example, to enable a cargo feature:

npm run build -- --feature=beetle

npm run debug

Similar to npm run build but generates a debug build with cargo.

npm run cross

Similar to npm run build but uses cross-rs to cross-compile for another platform. Use the CARGO_BUILD_TARGET environment variable to select the build target.

npm run release

Initiate a full build and publication of a new patch release of this library via GitHub Actions.

npm run dryrun

Initiate a dry run of a patch release of this library via GitHub Actions. This performs a full build but does not publish the final result.

npm test

Runs the unit tests by calling cargo test. You can learn more about adding tests to your Rust code from the Rust book.

Project Layout

The directory structure of this project is:

ed25519_enc/
├── Cargo.toml
├── README.md
├── lib/
├── src/
|   ├── index.mts
|   └── index.cts
├── crates/
|   └── ed25519_enc/
|       └── src/
|           └── lib.rs
├── platforms/
├── package.json
└── target/

Entry	Purpose
Cargo.toml	The Cargo manifest file, which informs the cargo command.
README.md	This file.
lib/	The directory containing the generated output from tsc.
src/	The directory containing the TypeScript source files.
index.mts	Entry point for when this library is loaded via ESM import syntax.
index.cts	Entry point for when this library is loaded via CJS require.
crates/	The directory tree containing the Rust source code for the project.
lib.rs	Entry point for the Rust source code.
platforms/	The directory containing distributions of the binary addon backend for each platform supported by this library.
package.json	The npm manifest file, which informs the npm command.
target/	Binary artifacts generated by the Rust build.

Learn More

Learn more about:

• Neon.
• Rust.
• Node.

LICENSE

MIT or Apache License 2.0 (at your option).