AES encryption/decryption

CypherExtensions.cs

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

namespace CodeRuse
{
    // https://bitlush.com/blog/symmetric-encryption-in-c-sharp
    public static class CypherExtensions
    {
        static string _aesSalt = "really-long-alphanumeric-string";
        static string _aesPassword = "really-long-alphanumeric-string";

        static string Encrypt<T>(this string value, string password, string salt)
             where T : SymmetricAlgorithm, new()
        {
            DeriveBytes rgb = new Rfc2898DeriveBytes(password, Encoding.Unicode.GetBytes(salt));

            SymmetricAlgorithm algorithm = new T();

            byte[] rgbKey = rgb.GetBytes(algorithm.KeySize >> 3);
            byte[] rgbIV = rgb.GetBytes(algorithm.BlockSize >> 3);

            ICryptoTransform transform = algorithm.CreateEncryptor(rgbKey, rgbIV);

            using (MemoryStream buffer = new MemoryStream())
            {
                using (CryptoStream stream = new CryptoStream(buffer, transform, CryptoStreamMode.Write))
                {
                    using (StreamWriter writer = new StreamWriter(stream, Encoding.Unicode))
                    {
                        writer.Write(value);
                    }
                }

                return Convert.ToBase64String(buffer.ToArray());
            }
        }

        static string Decrypt<T>(this string text, string password, string salt)
           where T : SymmetricAlgorithm, new()
        {
            DeriveBytes rgb = new Rfc2898DeriveBytes(password, Encoding.Unicode.GetBytes(salt));

            SymmetricAlgorithm algorithm = new T();

            byte[] rgbKey = rgb.GetBytes(algorithm.KeySize >> 3);
            byte[] rgbIV = rgb.GetBytes(algorithm.BlockSize >> 3);

            ICryptoTransform transform = algorithm.CreateDecryptor(rgbKey, rgbIV);

            using (MemoryStream buffer = new MemoryStream(Convert.FromBase64String(text)))
            {
                using (CryptoStream stream = new CryptoStream(buffer, transform, CryptoStreamMode.Read))
                {
                    using (StreamReader reader = new StreamReader(stream, Encoding.Unicode))
                    {
                        return reader.ReadToEnd();
                    }
                }
            }
        }

        public static string AesEncrypt(this string value)
        {
            return value.Encrypt<AesManaged>(_aesPassword, _aesSalt);
        }

        public static string AesDecrypt(this string text)
        {
            return text.Decrypt<AesManaged>(_aesPassword, _aesSalt);
        }
    }
}

EncryptDecrypt.cs

using Newtonsoft.Json;

string encryptedString = "I want to be encrypted".AesEncrypt();
string encryptedObj = JsonConvert.SerializeObject(new User { name = "Foo", TimeStamp = DateTime.UtcNow }).AesEncrypt();

string decryptedString = encryptedString.AesDecrypt();
User decryptedObj = JsonConvert.DeserializeObject<User>(encryptedObj.AesDecrypt());