A Node.js elliptic curve and RSA crypto helper library.

Usage no npm install needed!

<script type="module">
  import eccCryptoHelper from '';


Elliptic Curve Cryptography Helper Library

License: Apache-2.0 Coverage Status JavaScript Style Guide

Discalaimer: This library contains encryption software that is subject to the U.S. Export Administration Regulations. You may not export, re-export, transfer or download this code or any part of it in violation of any United States law, directive or regulation. In particular this software may not be exported or re-exported in any form or on any media to Iran, North Sudan, Syria, Cuba, or North Korea, or to denied persons or entities mentioned on any US maintained blocked list.


Provides basic functions to start using ECC in your next project. Please see the Features section for a quick description of what is available.


  • aescbc128: Encrypt and decrypt using AES-CBC-128 scheme.
  • aescbc192: Encrypt and decrypt using AES-CBC-192 scheme.
  • aescbc256: Encrypt and decrypt using AES-CBC-256 scheme.
  • aesgcm128: Encrypt and decrypt using AES-GCM-128 scheme.
  • aesgcm192: Encrypt and decrypt using AES-GCM-192 scheme.
  • aesgcm256: Encrypt and decrypt using AES-GCM-256 scheme.
  • base62: Base62 Encode/decode functions.
  • base64: Base64 URL encode/decode functions.
  • common: Random string, numbers, and UTC timestamp.
  • ecc256: ECC with P-256 functions. Also contains functions to sign and verify the signatures, and convert PEM certificates to JWK.
  • ecc384: ECC with P-384 functions. Also contains functions to sign and verify the signatures, and convert PEM certificates to JWK.
  • ecc521: ECC with P-521 functions. Also contains functions to sign and verify the signatures, and convert PEM certificates to JWK.
  • hash: SHA-256, SHA-384, and SHA-512 functions.
  • hmac: Generate HMAC.
  • hkdf: Key contraction and expansion algorithm to derive additional bytes.
  • jwt: Generate and verify JSON Web Tokens. The JWTs support ES384, ES512, HS384, and HS512 algorithms.
  • ksuid: Generate and parse KSUID identifiers. You can use this instead of a UUID.
  • password: Password hash and match functions. Uses Scrypt + HKDF for password hashing.
  • rsa: Generate key pairs, perform public key encryption and private key decryption, sign and verify using private and public keys respectively. Convert RSA keys between PEM and JWK.

Example Usage

  1. Install the library.
gt; yarn add ecc-crypto-helper
  1. Just import the file in your NodeJS project and start using it.
// Import individual libraries
var common = require("ecc-crypto-helper/common");
common.random().then(function (result) {


var eccHelper = require("ecc-crypto-helper")

// Generate a random value
var random = await eccHelper.common.random();

// Generate a random number between 1 and 100
var randomNumber = await eccHelper.common.randomNumber(1, 100);

// Base64 URL encode a string
var encoded = await eccHelper.base64.urlEncode("Hello world");

// Hash a password before storing it in your database
var plainPassword = "I am a super password";
var hashedPassword = (await eccHelper.password.hash(plainPassword)).toString("hex");

// Did the user supply the correct password?
var passwordMatch = await eccHelper.password.match(plainPassword, hashedPassword);

if (passwordMatch) {
    // Let the user in to the application
} else {
    // Password was not correct

// Encrypt a string using AES-GCM-256
var password = "This is a secret";
var cipherText = await eccHelper.aesGcm256.encrypt("This is a message", password);

// Decrypt the previously encrypted string
var plainText = await eccHelper.aesGcm256.decrypt(cipherText, password);

// Derive a random set of characters using HKDF
var initialKeyMaterial = "This is a secret";
var size = 64;
var bytesBuffer = await eccHelper.hkdf.derive(initialKeyMaterial, size);

// Generate a JSON Web Token using HS512
var sharedSecret = "This is a secret";
var claims = {"username":"bob"};
var webToken = await eccHelper.jwt.hs512.create(sharedSecret, claims);

// Decode the JSON Web Token
var decodedToken = await eccHelper.jwt.decode(webToken);

// Generate a RSA key pair
var rsaKeyPair = await eccHelper.rsa.generateKeyPair(2048) // 1024, 2048, or 4096
var jwkPrivateKey = await eccHelper.rsa.convertPemToJwk(rsaKeyPair.privateKey)
var jwkPublicKey = await eccHelper.rsa.convertPemToJwk(rsaKeyPair.publicKey)
var rsaPrivateKey = await eccHelper.rsa.convertJwkToPem(jwkPrivateKey)
var rsaPublicKey = await eccHelper.rsa.convertJwkToPem(jwkPublicKey)

// Generate an ECDH key pair
var keyPair = await eccHelper.ecc521.generatePemKeyPair();

// Generate a JSON Web Token using ES512
webToken = await eccHelper.jwt.es512.create(keyPair.privateKey, claims);

// Create and parse KSUID
var ksuid = await eccHelper.ksuid.create();
var parsed = await eccHelper.ksuid.parse(ksuid);

// Generate a shared secret
var sharedSecret = await eccHelper.sharedSecretGenerator.generateSharedSecret(32) // 256-bit key
var sharedSecretToJSONWebKey = await eccHelper.sharedSecretGenerator.convertSharedSecretToJwk(sharedSecret)
var sharedSecretAsJSONWebKey = await eccHelper.sharedSecretGenerator.generateSharedSecretAsJwk(32) // 256-bit key

See the test/spec.js file for more examples.