AesEncryptionHelper

AesEncryptionHelper.cs

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

namespace Lemonway.TransactionService.Application
{
    public static class AesEncryptionHelper
    {
        public static string Encrypt(string payload, string secret)
        {
            byte[] iv = new byte[16];
            byte[] array;

            byte[] key = new byte[32];
            Array.Copy(Encoding.ASCII.GetBytes(secret), 0, key, 0, 32);

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

                ICryptoTransform encryptor = aes.CreateEncryptor();

                using var memoryStream = new MemoryStream();
                using var cryptoStream = new CryptoStream(memoryStream, encryptor, CryptoStreamMode.Write);
                using (var streamWriter = new StreamWriter(cryptoStream))
                {
                    streamWriter.Write(payload);
                }

                array = memoryStream.ToArray();
            }

            return Convert.ToBase64String(array);
        }

        public static string Decrypt(string encodedPayload, string secret)
        {
            using Aes aes = Aes.Create();
            aes.Key = Encoding.ASCII.GetBytes(secret).AsSpan(0, 32).ToArray();
            aes.IV = new byte[16];

            ICryptoTransform cryptoTransform = aes.CreateDecryptor();

            byte[] buffer = Convert.FromBase64String(encodedPayload);
            using var memoryStream = new MemoryStream(buffer);
            using var cryptoStream = new CryptoStream(memoryStream, cryptoTransform, CryptoStreamMode.Read);
            using var streamReader = new StreamReader(cryptoStream);

            return streamReader.ReadToEnd();
        }
    }
}