MachineKeyBasedEncryptor

MachineKeyBasedEncryptor.cs

using System;
using System.IO;
using System.IO.Compression;
using System.Text;
using System.Web;
using System.Web.Security;

public static class MachineKeyBasedEncryptor
{
    public static string Encrypt(string value)
    {
        if (string.IsNullOrEmpty(value))
        {
            throw new ArgumentNullException("value");
        }

        string encryptedValue = MachineKey.Encode(Encoding.ASCII.GetBytes(value), MachineKeyProtection.Encryption);

        return encryptedValue;
    }

    public static string Decrypt(string value)
    {
        if (string.IsNullOrEmpty(value))
        {
            throw new ArgumentNullException("value");
        }

        return Encoding.Unicode.GetString(MachineKey.Decode(value, MachineKeyProtection.Encryption));
    }

    public static string EncryptAndUrlEncode(string value)
    {
        if (string.IsNullOrEmpty(value))
        {
            throw new ArgumentNullException("value");
        }

        string encryptedValue = Encrypt(value);

        byte[] encryptedValueBuffer = Encoding.ASCII.GetBytes(encryptedValue);
            
        return HttpServerUtility.UrlTokenEncode(encryptedValueBuffer);
    }

    public static string UrlDecodeAndDecrypt(string value)
    {
        if (string.IsNullOrEmpty(value))
        {
            throw new ArgumentNullException("value");
        }

        byte[] unencodedValueBuffer = HttpServerUtility.UrlTokenDecode(value);

        string unencodedValue = Encoding.UTF8.GetString(unencodedValueBuffer);

        string decryptedValue = Decrypt(unencodedValue);

        return decryptedValue;
    }

    public static string Compress(string value)
    {
        using (var ms = new MemoryStream())
        {
            using (var zip = new GZipStream(ms, CompressionMode.Compress, true))
            {
                zip.Write(Encoding.UTF8.GetBytes(value), 0, value.Length);
            }
            return Convert.ToBase64String(ms.ToArray());
        }
    }

    public static string Decompress(string value)
    {
        using (var ms = new MemoryStream(Convert.FromBase64String(value)))
        {
            using (var zip = new GZipStream(ms, CompressionMode.Decompress, true))
            {
                using (var reader = new BinaryReader(zip))
                {
                    return Encoding.UTF8.GetString(reader.ReadBytes(10000));
                }
            }
        }
    }
}