kms Crypto AESEncrypter Partial

AESEncrypter.cs

using System;
using System.IO;
using System.Security.Cryptography;
using System.Threading.Tasks;
using Abstractions;
using Amazon.KeyManagementService;
using Amazon.KeyManagementService.Model;

namespace Crypto
{
    public class AESEncrypter : IEncrypter
    {        
        private readonly string _keyId = "<your-key>";
        private readonly byte[] _iv = new byte[] { 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };        

        public async Task<IEncryptionPackage> Encrypt(string plainText)
        {
            

        }
    }
}