createCipheriv Returns "Invalid iv" Error

[baryon]

I'm creating a standard Electrum ECDH encryption algorithm. I encounter an error when using the createCipheriv function. However, there are no issues when using Node.js or react-native-crypto. Could you take a look at the reason? If you need test code, you can refer to the example below. The bsv library is required and can be installed using npm install [email protected].

import crypto from "react-native-quick-crypto";
import bsv from "bsv";

const PrivateKey = bsv.PrivateKey;
const PublicKey = bsv.PublicKey;
const Hash = bsv.crypto.Hash;

function electrumECDHKey(publicKey, privateKey) {
  // Get ECDH Key
  const buf = PublicKey(publicKey.point.mul(privateKey.bn)).toBuffer();
  return Hash.sha512(buf);
}

function encrypt(message: string, publicKey: string, privateKey?: string) {
  // Prepare keys
  const recvPubkey = new PublicKey(publicKey);
  // Override ephemeral_key if privateKey is given. This overriding is for traditional ECIES.
  const ephemeralKey = new PrivateKey(privateKey);
  const ecdhKey = electrumECDHKey(recvPubkey, ephemeralKey);
  const iv = ecdhKey.subarray(0, 16);
  const keyE = ecdhKey.subarray(16, 32);
  const keyM = ecdhKey.subarray(32, 64);

  // Encrypt with AES-128-CBC
  const cipher = crypto.createCipheriv("aes-128-cbc", keyE, iv);
  let crypted = cipher.update(message, "utf8", "binary");
  crypted += cipher.final("binary");

  // Build Encrypted Massage
  const ephemeralPubkey = ephemeralKey.toPublicKey().toBuffer();
  const encrypted = Buffer.concat([
    Buffer.from("BIE1"),
    ephemeralPubkey,
    Buffer.from(crypted, "binary"),
  ]);
  const hmac = Hash.sha256hmac(Buffer.from(encrypted), Buffer.from(keyM));

  return Buffer.concat([encrypted, hmac]);
}

encrypt("Hello World", new PrivateKey().publicKey)