Question:

How to do PHP Decryption from Node.js Encryption

Decrypting data in PHP that has been encrypted using Node.js requires ensuring that both platforms use compatible encryption algorithms and configurations. Here is a basic guide on how you can achieve PHP decryption from Node.js encryption:

Node.js Encryption (Example using crypto module):

const crypto = require('crypto');

// Your secret key and initialization vector (IV)

const secretKey = 'yourSecretKey';

const iv = Buffer.from('yourInitializationVector', 'hex');

// Data to be encrypted

const dataToEncrypt = 'Hello, this is a secret message!';

// Create a cipher using AES-256-CBC algorithm

const cipher = crypto.createCipheriv('aes-256-cbc', Buffer.from(secretKey), iv);

// Update the cipher with the data and finalize

let encryptedData = cipher.update(dataToEncrypt, 'utf-8', 'hex');

encryptedData += cipher.final('hex');

console.log('Encrypted Data:', encryptedData);

To decrypt data in PHP that was encrypted in Node.js using aes-256-ctr, you'll need to make sure the key, IV, and encrypted data are correctly transferred and decoded. Here's how you can do it:

Make sure you have hex-encoded versions of your encrypted data (encryptedData), key (key), and initialization vector (iv) from Node.js.

Use the hex2bin() function in PHP to convert these hex-encoded strings to binary data.

Finally, use openssl_decrypt to decrypt the data.

// Your hex-encoded encrypted data, key, and iv from Node.js

$encryptedData = "your_hex_encoded_encrypted_data";

$key = "your_hex_encoded_key";

$iv = "your_hex_encoded_iv";

// Convert hex-encoded values to binary

$key = hex2bin($key);

$iv = hex2bin($iv);

$encryptedData = hex2bin($encryptedData);

// Decrypt using openssl_decrypt