public static bool ValidateCertificates(X509Certificate2 cert)
{
var pathCA = Directory.GetCurrentDirectory() + "/../../CryptoFiles/rootca.pem";
var caCertificate = new X509CertificateParser().ReadCertificate(File.ReadAllBytes(pathCA));
var pathCRL = Directory.GetCurrentDirectory() + "/../../CryptoFiles/crl/list.pem";
var crl = new X509CrlParser().ReadCrl(File.ReadAllBytes(pathCRL));
var receiverCert = new X509CertificateParser().ReadCertificate(cert.GetRawCertData());
try
{
receiverCert.Verify(caCertificate.GetPublicKey());
}
catch
{
MessageBox.Show("Receiver's certificate is not signed by CA!");
return(false);
}
if (crl.IsRevoked(receiverCert))
{
MessageBox.Show("Receiver's certificate is revoked!");
return(false);
}
return(true);
}
public static void Main(String[] args)
{
DirectoryInfo directory = new DirectoryInfo(DEST);
directory.Create();
Properties properties = new Properties();
// Specify the correct path to the certificate
properties.Load(new FileStream("c:/home/blowagie/key.properties", FileMode.Open, FileAccess.Read));
String path = properties.GetProperty("PRIVATE");
char[] pass = properties.GetProperty("PASSWORD").ToCharArray();
Pkcs12Store pk12 = new Pkcs12Store(new FileStream(path, FileMode.Open, FileAccess.Read), pass);
string alias = null;
foreach (var a in pk12.Aliases)
{
alias = ((string)a);
if (pk12.IsKeyEntry(alias))
{
break;
}
}
ICipherParameters pk = pk12.GetKey(alias).Key;
X509CertificateEntry[] ce = pk12.GetCertificateChain(alias);
X509Certificate[] chain = new X509Certificate[ce.Length];
for (int k = 0; k < ce.Length; ++k)
{
chain[k] = ce[k].Certificate;
}
FileStream fileStream = new FileStream(CRLURL, FileMode.Open, FileAccess.Read);
MemoryStream baos = new MemoryStream();
byte[] buf = new byte[1024];
while (fileStream.Read(buf, 0, buf.Length) != 0)
{
baos.Write(buf, 0, buf.Length);
}
/* Create a CrlClientOffline instance with the read CRL file's data.
* Given CRL file is specific to the CAcert provider and was downloaded long time ago.
* Make sure that you have the CRL specific for your certificate and CRL is up to date
* (by checking NextUpdate properties as seen below).
*/
ICrlClient crlClient = new CrlClientOffline(baos.ToArray());
X509Crl crl = new X509CrlParser().ReadCrl(new FileStream(CRLURL, FileMode.Open, FileAccess.Read));
Console.WriteLine("CRL valid until: " + crl.NextUpdate);
Console.WriteLine("Certificate revoked: " + crl.IsRevoked(chain[0]));
IList <ICrlClient> crlList = new List <ICrlClient>();
crlList.Add(crlClient);
new C3_05_SignWithCRLOffline().Sign(SRC, DEST + RESULT_FILES[0], chain, pk,
DigestAlgorithms.SHA256, PdfSigner.CryptoStandard.CMS, "Test", "Ghent",
crlList, null, null, 0);
}