Шифрование и дешифрование с использованием C# и JS

Вот пример функций шифрования и дешифрования AES (режим ECB) с использованием .NET Core и JS с использованием CryptoJS.

using System.Security.Cryptography;
using System.Text;
using System.IO;
using System;

public class Program
{
    public static void Main(string[] args)
    {
       string secret = "abcdefghijklmnop";
        byte[] key = Encoding.UTF8.GetBytes(secret);

        string plainText = "Text to encode";
        byte[] plainBytes = Encoding.UTF8.GetBytes(plainText);

        byte[] cipherBytes = Encrypt(plainBytes, key);
        string cipherText = Convert.ToBase64String(cipherBytes);
        Console.WriteLine("Cipher Text: " + cipherText);

        byte[] decryptedBytes = Decrypt(cipherBytes, key);
        string decryptedText = Encoding.UTF8.GetString(decryptedBytes);
        Console.WriteLine("Decrypted Text: " + decryptedText);

        Console.ReadLine();
    }

    static byte[] Encrypt(byte[] plainBytes, byte[] key)
    {
        byte[] encryptedBytes = null;

        // Set up the encryption objects
        using (Aes aes = Aes.Create())
        {
            aes.Key = key;
            aes.Mode = CipherMode.ECB;
            aes.Padding = PaddingMode.PKCS7;

            // Encrypt the input plaintext using the AES algorithm
            using (ICryptoTransform encryptor = aes.CreateEncryptor())
            {
                encryptedBytes = encryptor.TransformFinalBlock(plainBytes, 0, plainBytes.Length);
            }
        }

        return encryptedBytes;
    }

    static byte[] Decrypt(byte[] cipherBytes, byte[] key)
    {
        byte[] decryptedBytes = null;

        // Set up the encryption objects
        using (Aes aes = Aes.Create())
        {
            aes.Key = key;
            aes.Mode = CipherMode.ECB;
            aes.Padding = PaddingMode.PKCS7;

            // Decrypt the input ciphertext using the AES algorithm
            using (ICryptoTransform decryptor = aes.CreateDecryptor())
            {
                decryptedBytes = decryptor.TransformFinalBlock(cipherBytes, 0, cipherBytes.Length);
            }
        }

        return decryptedBytes;
    }
}
const crypto = require('cryptojs').Crypto;

let plainText = "Text to encrypt";
let cipherText = "<cipher text from encryption function>";
let secret = "abcdefghijklmnop";

let key = CryptoJS.enc.Utf8.parse(secret);

let encryptedBytes = CryptoJS.AES.encrypt(plainText, key, {mode: CryptoJS.mode.ECB, padding: CryptoJS.pad.Pkcs7});
let encryptedString = encryptedBytes.toString();

console.log(encryptedString);

let decryptedBytes = CryptoJS.AES.decrypt(cipherText, key, {mode: CryptoJS.mode.ECB, padding: CryptoJS.pad.Pkcs7});
let decryptedText = decryptedBytes.toString(CryptoJS.enc.Utf8);

console.log(decryptedText);