private bool VerifySignature(byte[] messageBytes, byte[] encodeMessage)
{
try
{
ContentInfo cont = new ContentInfo(messageBytes);
SignedCms verified = new SignedCms(cont, true);
verified.Decode(encodeMessage);
X509Certificate2Collection Collection =
new X509Certificate2Collection(_RecipientCert);
try
{
verified.CheckSignature(Collection, true);
if (verified.Certificates.Count > 0)
{
if (!verified.Certificates[0].Equals(_RecipientCert))
{
return(false);
}
}
}
catch (Exception exx)
{
NLogLogger.Info("" + exx);
return(false);
}
return(true);
}
catch (Exception ex)
{
NLogLogger.Info("" + ex);
throw ex;
}
}
/// <summary>
/// Verifies the digital signatures on the signed CMS/PKCS #7 message.
/// </summary>
public bool Verify(string TextData, string DigitalSignature)
{
byte[] encodeMessage = null;
try
{
encodeMessage = Convert.FromBase64String(DigitalSignature);
}
catch (Exception ex)
{
NLogLogger.Info("" + ex);
return(false);
}
return(VerifySignature(_Enc.GetBytes(TextData), encodeMessage));
}
public static void Download(string filepath, string filename)
{
Stream iStream = null;
var buffer = new Byte[100000];
try
{
iStream = new FileStream(filepath, FileMode.Open, FileAccess.Read, FileShare.Read);
var dataToRead = iStream.Length;
HttpContext.Current.Response.ContentType = "application/octet-stream";
HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment; filename=" + filename);
while (dataToRead > 0)
{
if (HttpContext.Current.Response.IsClientConnected)
{
var length = iStream.Read(buffer, 0, 100000);
HttpContext.Current.Response.OutputStream.Write(buffer, 0, length);
HttpContext.Current.Response.Flush();
buffer = new Byte[100000];
dataToRead = dataToRead - length;
}
else
{
dataToRead = -1;
}
}
}
catch (Exception ex)
{
File.Delete(filepath);
NLogLogger.Info(ex.ToString());
HttpContext.Current.Response.Write("Error : " + ex.Message);
Back();
}
finally
{
if (iStream != null)
{
iStream.Close();
}
HttpContext.Current.Response.Close();
File.Delete(filepath);
}
}