ecies-25519

Isomorphic Cryptography Library for X25519 ECIES

Description

This library supports ECIES encryption using Curve25519 Diffie–Hellman key exchange (aka X25519).

AES, HMAC and SHA methods are supported through native NodeJS and Browser APIs when available and fallbacks to vanilla javascript are already provided.

Usage

ECIES

import * as ecies25519 from "ecies-25519";
import * as encoding from "@u-connect/encoding";

const keyPair = ecies25519.generateKeyPair();

const str = "test message to encrypt";
const msg = encoding.utf8ToArray(str);

const encrypted = await ecies25519.encrypt(msg, keyPairB.publicKey);

const decrypted = await ecies25519.decrypt(encrypted, keyPairB.privateKey);

// decrypted === msg

ECDH

import * as ecies25519 from "ecies-25519";

const keyPairA = ecies25519.generateKeyPair();
const keyPairB = ecies25519.generateKeyPair();

const sharedKey1 = await ecies25519.derive(
  keyPairA.privateKey,
  keyPairB.publicKey
);

const sharedKey2 = await ecies25519.derive(
  keyPairB.privateKey,
  keyPairA.publicKey
);

// sharedKey1 === sharedKey2

RandomBytes

import * as ecies25519 from "ecies-25519";

const length = 32;
const key = ecies25519.randomBytes(length);

// key.length === length

AES

import * as ecies25519 from "ecies-25519";
import * as encoding from "@u-connect/encoding";

const key = ecies25519.randomBytes(32);
const iv = ecies25519.randomBytes(16);

const str = "test message to encrypt";
const msg = encoding.utf8ToArray(str);

const ciphertext = await ecies25519.aesCbcEncrypt(iv, key, msg);

const decrypted = await ecies25519.aesCbcDecrypt(iv, key, ciphertext);

// decrypted === str

HMAC

import * as ecies25519 from "ecies-25519";
import * as encoding from "@u-connect/encoding";

const key = ecies25519.randomBytes(32);
const iv = ecies25519.randomBytes(16);

const macKey = encoding.concatArrays(iv, key);
const dataToMac = encoding.concatArrays(iv, key, msg);

const mac = await ecies25519.hmacSha256Sign(macKey, dataToMac);

const result = await ecies25519.hmacSha256Verify(macKey, dataToMac, mac);

// result will return true if match

SHA2

import * as ecies25519 from "ecies-25519";
import * as encoding from "@u-connect/encoding";

// SHA256
const str = "test message to hash";
const msg = encoding.utf8ToArray(str);
const hash = await ecies25519.sha256(str);

// SHA512
const str = "test message to hash";
const msg = encoding.utf8ToArray(str);
const hash = await ecies25519.sha512(str);

React-Native Support

This library is intended for use in a Browser or NodeJS environment, however it is possible to use in a React-Native environment if NodeJS modules are polyfilled with react-native-crypto, read more here.

License

MIT License