@mryhryki/simple-encryption

Simple encryption/decryption library for Node.js/Deno/Bun/Browser.

Concept

• No dependencies, Only use Web Cryptography API
• Easy to use without detailed knowledge for encryption (Please use other libraries for complex usage)

License

MIT

Available on

• npm: https://www.npmjs.com/package/@mryhryki/simple-encryption

Demo Page (Browser)

• Encrypt (Source)
• Decrypt (Source)

Supported Runtimes

This works on JavaScript runtimes that support the Web Cryptography API.

This has been tested on these runtimes.

• Node.js: v18, v20, v22, latest (Workflow file)
• Deno: v1.x, v2.x, canary (Workflow file)
• Bun: latest, canary (Workflow file)

Supported Algorithms

You can use these algorithm:

• AES-GCM (Default, Recommended)
• AES-CBC

How to Use

Generate Secret Key

NOTICE: The generated secret key must be kept secret.

# Generate by OpenSSL
$ openssl rand -hex 32
51bf5c934cc23e8498fdb636eed56c05fb0dc6d148a127a34c118b0fced1fc22 # Example Value (256 bits hex string)

# Generate by Node.js
cat << EOS | node
const crypto = require("crypto");
const arr = new Uint8Array(32);
crypto.getRandomValues(arr);
console.log(Buffer.from(arr).toString("hex"));
EOS

# Generate by Deno
cat << EOS | deno
import { encode } from "https://deno.land/[email protected]/encoding/hex.ts";
const arr = new Uint8Array(32);
crypto.getRandomValues(arr);
console.log(new TextDecoder().decode(encode(arr)));
EOS

Use by Node.js

Add @mryhryki/simple-encryption to your package.json:

$ npm install @mryhryki/simple-encryption

Set "type": "module" in your package.json. (If you use bundler (webpack, esbuild, etc.), you may don't need to set this.)

# Check settings
$ cat package.json | grep '"type":'
  "type": "module",

Add index.js file:

// If you are using Node.js v19 or later, there is `crypto` in `globalThis`, you don't need to import crypto.
//
// Ref:
// - https://github.com/nodejs/node/pull/42083
// - https://github.com/nodejs/node/blob/main/doc/changelogs/CHANGELOG_V19.md#19.0.0
import { webcrypto as crypto } from "crypto";
import { decrypt, encrypt } from "@mryhryki/simple-encryption";

(async () => {
  const key = "522a432195523d9f8cb65ee85c42e06f6e4f1839e8e6cf11a19631600e17d726"; // This value is sample
  const plainData = new TextEncoder().encode("cf0f2168-ddfc-4c98-be81-1d34e660dd1a"); // Use TextEncoder if you want to encrypt string

  // Encrypt
  const encryptResult = await encrypt({ key, plainData, crypto });
  console.log("Encrypt Result:", JSON.stringify(encryptResult, null, 2));

  // Decrypt
  const decryptResult = await decrypt({ ...encryptResult, key, crypto });
  console.log("Decrypt Result:", new TextDecoder().decode(decryptResult.plainData)); // Use TextDecoder if you want to decrypt as string
})();

And run index.js by Node.js:

$ node ./index.js
Encrypt Result: {
  "alg": "AES-GCM",
  "data": "955518aaedc18ed0a761d289a3a5fa91c69c003da99b11d1efa7282a0325d24049fe65fb67b6552d935a1a3407129120c00b9c47",
  "iv": "a7dd2a80bd982113ba5fe7a77a6b22b7"
}
Decrypt Result: cf0f2168-ddfc-4c98-be81-1d34e660dd1a

Use by Deno

Add index.js file:

// index.js
import { decrypt, encrypt } from "npm:@mryhryki/simple-encryption";
// or Using CDN
// import { decrypt, encrypt } from "https://cdn.skypack.dev/@mryhryki/simple-encryption";
// import { decrypt, encrypt } from "https://esm.sh/@mryhryki/simple-encryption";

const key = "522a432195523d9f8cb65ee85c42e06f6e4f1839e8e6cf11a19631600e17d726"; // This value is sample
const plainData = new TextEncoder().encode("cf0f2168-ddfc-4c98-be81-1d34e660dd1a"); // Use TextEncoder if you want to encrypt string

// Encrypt
const encryptResult = await encrypt({ key, plainData });
console.log("Encrypt Result:", JSON.stringify(encryptResult, null, 2));

// Decrypt
const decryptResult = await decrypt({ ...encryptResult, key });
console.log("Decrypt Result:", new TextDecoder().decode(decryptResult.plainData)); // Use TextDecoder if you want to decrypt as string

And run index.js by Deno:

$ deno run ./index.js
Encrypt Result: {
  "alg": "AES-GCM",
  "data": "955518aaedc18ed0a761d289a3a5fa91c69c003da99b11d1efa7282a0325d24049fe65fb67b6552d935a1a3407129120c00b9c47",
  "iv": "a7dd2a80bd982113ba5fe7a77a6b22b7"
}
Decrypt Result: cf0f2168-ddfc-4c98-be81-1d34e660dd1a

Use by Browser

Add index.js file:

(async () => {
  const { encrypt, decrypt } = await import("https://cdn.skypack.dev/@mryhryki/simple-encryption");
  // or
  // const {encrypt, decrypt} = await import("https://esm.sh/@mryhryki/simple-encryption")

  const key = "522a432195523d9f8cb65ee85c42e06f6e4f1839e8e6cf11a19631600e17d726"; // This value is sample
  const plainData = new TextEncoder().encode("cf0f2168-ddfc-4c98-be81-1d34e660dd1a"); // Use TextEncoder if you want to encrypt string

  // Encrypt
  const encryptResult = await encrypt({ key, plainData });
  console.log("Encrypt Result:", JSON.stringify(encryptResult, null, 2));

  // Decrypt
  const decryptResult = await decrypt({ ...encryptResult, key });
  console.log("Decrypt Result:", new TextDecoder().decode(decryptResult.plainData)); // Use TextDecoder if you want to decrypt as string
})();

Add HTML file and import index.js by <script> tag:

<!-- index.html -->
...
<script src="./index.js"></script>
...

Open index.html by Browser and check that the following logs are output to the Developer Tools Console:

Encrypt Result: {
  "alg": "AES-GCM",
  "data": "955518aaedc18ed0a761d289a3a5fa91c69c003da99b11d1efa7282a0325d24049fe65fb67b6552d935a1a3407129120c00b9c47",
  "iv": "a7dd2a80bd982113ba5fe7a77a6b22b7"
}
Decrypt Result: cf0f2168-ddfc-4c98-be81-1d34e660dd1a

API

encrypt()

Arguments

Name	Type	Required	Description
alg	string	No	Algorithm name: AES-GCM or AES-CBC (Default: AES-GCM)
iv	string (Hex)	No	Initial vector. DON'T specify this if you don't need.
key	string (Hex)	Yes	Your secret key.
plainData	Uint8Array	Yes	Plain data you want to encrypt.
crypto	Crypto	No	Crypto object. Required if using Node.js (<19.x).

Return Value

Name	Type	Description
alg	string	Encrypt algorithm name. Same value as args.alg if you specified.
data	string (Hex)	Encrypted data.
iv	string (Hex)	Initial vector. Use when decryption. Same value as args.alg if you specified.

decrypt()

Arguments

Name	Type	Required	Description
alg	string	Yes	Algorithm name: AES-GCM or AES-CBC. Must specify same value as during encryption.
data	string (Hex)	Yes	Encrypted data.
iv	string (Hex)	Yes	Initial vector. Must specify same value as during encryption.
key	string (Hex)	Yes	Your secret key. Must specify same value as during encryption.
crypto	Crypto	No	Crypto object. Required if using Node.js (<19.x).

Return Value

Name	Type	Description
plainData	Uint8Array	Decrypted data.

Development

1. Fork this repository.
2. Install Node.js.
3. Install dependencies for development by npm install.
4. Edit source code.
5. Check by npm run check.
6. Push to GitHub and create Pull Request, so CI will run tests.

Release

Run release workflow.