//This code sample was created using Java 8.
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.util.Arrays;
import java.util.Base64;
private static final String CIPHER = "AES/ECB/PKCS5PADDING";
private static final String KEY_ALGO = "AES";
public static String encrypt(final String plainText, final String secret) {
        try {
            SecretKeySpec keySpec = makeKey(secret);
            byte[] plainTextByte = plainText.getBytes();
            Cipher cipher = Cipher.getInstance(CIPHER);
            cipher.init(Cipher.ENCRYPT_MODE, keySpec);
            byte[] encryptedByte = cipher.doFinal(plainTextByte);
            Base64.Encoder encoder = Base64.getEncoder();
            return encoder.encodeToString(encryptedByte);
        } catch (Exception exception) {
            LOGGER.log(Level.SEVERE, "Error while encrypting: ", exception);
        }
            return null;
    }
 
private static SecretKeySpec makeKey(final String secret)
{
    SecretKeySpec secretKey = null;
    try {
            byte[] key = secret.getBytes(StandardCharsets.UTF_8);
            key = Arrays.copyOf(key, 16);
            secretKey = new SecretKeySpec(key, KEY_ALGO);
         }
    catch(Exception exception){
            LOGGER.error("Error while secret key creation: ", exception);
    }
    return secretKey;
}

//This code sample was created using C# 6.0.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Security.Cryptography;
using System.IO;
public static string Encrypt(string plainText, string secret)
    {
     using (var rijAlg = new RijndaelManaged())
     {
     rijAlg.Mode = CipherMode.ECB;
     rijAlg.Padding = PaddingMode.PKCS7;
     rijAlg.Key = MakeKey(secret);
     using (var encryptor = rijAlg.CreateEncryptor())
     {
     byte[] plainBytes = Encoding.UTF8.GetBytes(plainText);
     using (var msEncrypt = new MemoryStream())
     {
     using (var csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
     {
     csEncrypt.Write(plainBytes, 0, plainBytes.Length);
     csEncrypt.FlushFinalBlock();
     }
     byte[] encryptedBytes = msEncrypt.ToArray();
     return Convert.ToBase64String(encryptedBytes);
     }
     }
     }
    }
public static byte[] MakeKey(string key)
{
byte[] bytes = Encoding.UTF8.GetBytes(key);
return bytes.Take(16).ToArray();
    }

//This code sample was created using Node v18.0.
const crypto = require('crypto');
const ciphertext = 'encrypted text'; // encrypted text
const ciphering = 'AES-128-ECB'; // encryption algorithm and mode
const saltkey = 'sharedsecretkey'; // shared secret key
function makeKey(saltkey) {
return saltkey.slice(0, 16);
}
function encrypt(plaintext,secretkey){
// Create the cipher object
const cipher = crypto.createCipheriv('aes-128-ecb', secretkey, '');
// Update the cipher with the plaintext input
let ciphertext = cipher.update(plaintext, 'utf8', 'base64');
// Finalize the cipher and append any remaining data
ciphertext += cipher.final('base64');
return ciphertext;
}
secretkey = makeKey(saltkey);
plaintext = encrypt(ciphertext,secretkey);
// Print the encrypted ciphertext
console.log(ciphertext);

"This code sample was created using Python 3"
from base64 import b64decode
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives import padding
from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
UTF_8 = "utf-8"
SHARED_ENCODING_KEY = "secret key"
ENCRYPTED_TEXT = "encrypted text"
def make_aes_ecb_cipher(secret: str, key_size: int = 16) -> Cipher:
"""Makes the AES/ECB cipher using python stdlib packages.
Args:
secret (str): Shared secret
key_size (int): Size of the key made using the secret
Returns:
Cipher: Returns the AES/ECB cipher for encryption/decryption
"""
return Cipher(
algorithms.AES(make_key(secret, key_size)),
modes.ECB(),
backend=default_backend(),
)
def make_key(secret: str, key_size: int) -> str:
"""Create the key used for AES encryption/decryption using
the shared secret.
Args:
secret (str): Shared secret
key_size (int): Size of the key made using the secret
Returns:
str: Key used for AES encryption/decryption
"""
if key_size <= 0:
AssertionError("key_size cannot be <=0.")
return secret.encode(UTF_8)[:key_size]
def encrypt_to_base64(plain_text: str, secret: str, key_size: int) -> str:
"""Encrypts plain_text to AES/ECB/PKCS5 encrypted text.
Args:
plain_text (str): Text which will be encrypted to aes_ecb_pkcs5 b64
secret (str): Shared secret
key_size (int): Size of the key made using the secret
Returns:
str: Encrypted text using AES/ECB/PKCS5 encryption in base64
"""
padder = padding.PKCS7(algorithms.AES.block_size).padder()
padded_bytes = padder.update(plain_text.encode(UTF_8)) + padder.finalize()
cipher = make_aes_ecb_cipher(secret, key_size)
encryptor = cipher.encryptor()
encrypted_bytes = encryptor.update(padded_bytes) + encryptor.finalize()
return b64encode(encrypted_bytes).decode(UTF_8)
print(encrypt_to_base64(PLAIN_TEXT, SHARED_ENCODING_KEY, 16))

//This code sample was created using PHP 5.5
<!--?php
function makeKey($saltkey) {
return substr($saltkey, 0, 16);
}
// Store the cipher method - AES/ECB/PKCS5PADDING
$ciphering = "AES-128-ECB";
// Store a string into the variable which need to be Encrypted
$plain_text = "plain text";
// Store the encryption key
$saltkey = "sharedsecretkey";
// make secret key from saltkey
$secretkey = makeKey($saltkey);
// Use openssl_encrypt() function to encrypt the data
$encryption = base64_encode(openssl_encrypt($plain_text, $ciphering, $secretkey, 1));
// Display the encrypted string
echo "\nEncrypted String: " . $encryption . "\n";
?-->