# AES Encryption with BASE64

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

public static string Encrypt(string plainText, byte[] key, byte[] iv)
{
byte[] encrypted;

using (Aes aes = Aes.Create())
{
aes.Key = key;
aes.IV = iv;

ICryptoTransform encryptor = aes.CreateEncryptor(aes.Key, aes.IV);

using (MemoryStream ms = new MemoryStream())
{
using (CryptoStream cs = new CryptoStream(ms, encryptor, CryptoStreamMode.Write))
{
using (StreamWriter sw = new StreamWriter(cs))
{
sw.Write(plainText);
}

encrypted = ms.ToArray();
}
}
}

return Convert.ToBase64String(encrypted);
}

public static string Decrypt(string cipherText, byte[] key, byte[] iv)
{
byte[] cipherBytes = Convert.FromBase64String(cipherText);
string plaintext = null;

using (Aes aes = Aes.Create())
{
aes.Key = key;
aes.IV = iv;

ICryptoTransform decryptor = aes.CreateDecryptor(aes.Key, aes.IV);

using (MemoryStream ms = new MemoryStream(cipherBytes))
{
using (CryptoStream cs = new CryptoStream(ms, decryptor, CryptoStreamMode.Read))
{
using (StreamReader sr = new StreamReader(cs))
{
plaintext = sr.ReadToEnd();
}
}
}
}

return plaintext;
}