public string Protect(FormsAuthenticationCookie cookie)
{
if (cookie == null)
{
throw new ArgumentNullException(nameof(cookie));
}
var unprotectedData = ConvertToBytes(cookie);
var cryptoProvider = AspNetCryptoServiceProvider.GetCryptoServiceProvider(_options);
var cryptoService = cryptoProvider.GetCryptoService();
byte[] protectedData = cryptoService.Protect(unprotectedData);
return(CryptoUtil.BinaryToHex(protectedData));
}
private byte[] ConvertToBytes(FormsAuthenticationCookie data)
{
if (data == null)
{
throw new ArgumentNullException(nameof(data));
}
using (var ticketBlobStream = new MemoryStream())
using (var ticketWriter = new SerializingBinaryWriter(ticketBlobStream))
{
ticketWriter.Write((byte)1);
ticketWriter.Write((byte)1);
ticketWriter.Write(data.IssuedUtc.Ticks);
ticketWriter.Write((byte)0xfe);
ticketWriter.Write(data.ExpiresUtc.Ticks);
ticketWriter.Write(data.IsPersistent);
ticketWriter.WriteBinaryString(data.UserName ?? "");
ticketWriter.WriteBinaryString(data.UserData ?? "");
ticketWriter.WriteBinaryString(data.CookiePath ?? "");
ticketWriter.Write((byte)0xff);
return(ticketBlobStream.ToArray());
}
}
