public static bool validatePDF(string filename, ref MessageReport msg)
{
try
{
X509CertificateParser parser = new X509CertificateParser();
if (certificates.Count() == 0)
{
certificates.Add(parser.ReadCertificate(new FileStream(ROOT1, FileMode.Open)));
certificates.Add(parser.ReadCertificate(new FileStream(ROOT2, FileMode.Open)));
certificates.Add(parser.ReadCertificate(new FileStream(ROOT3, FileMode.Open)));
}
PdfReader pdfReader = new PdfReader(filename);
AcroFields acroFields = pdfReader.AcroFields;
List <String> signatureNames = acroFields.GetSignatureNames();
msg.signaturesCount = signatureNames.Count();
if (signatureNames.Count == 0)
{
msg.StatusText = "Δεν βρέθηκαν ψηφιακές υπογραφές στο έγγραφο!";
return(false);
}
SignaturePermissions perms = null;
MessageReport.Signature sigInfo = new MessageReport.Signature();
foreach (String name in signatureNames)
{
sigInfo = InspectSignature(acroFields, name, perms);
UpdateSignatureResults(ref sigInfo); //produce human friendly result text
msg.Signatures.Add(sigInfo);
}
msg.StatusText = String.Format("Ο έλεγχος ολοκληρώθηκε επιτυχώς. Βρέθηκαν {0} ψηφιακές υπογραφές στο έγγραφο!", msg.signaturesCount);
return(true);
}
catch
{
return(false);
}
} //end validatePDF
private static void UpdateSignatureResults(ref MessageReport.Signature s)
{
MessageReport.Results r = new MessageReport.Results();
string hm = string.Empty;
r.result = false;
hm = "Το αρχείο ";
if (s.Certificate.isHardCertificate == false)
{
hm += "δεν ";
}
hm += "έχει υπογραφεί με χρήση πιστοποιητικού σκληρής αποθήκευσης της ΑΠΕΔ, ";
hm += "το οποίο ";
if (s.isValidDateSigning == false)
{
hm += "δεν ";
}
hm += " ήταν έγκυρο κατά την ημερομηνία υπογραφής. ";
hm += "Το αρχείο ";
if (s.isIntegral)
{
hm += "δεν ";
}
hm += " έχει τροποποιηθεί μετά την υπογραφή του και ";
if (s.isTimestampped == false)
{
hm += "δεν ";
}
hm += " φέρει ενσωματωμένη χρονοσφραγίδα. ";
if (s.isValidDateSigning && s.isIntegral && s.isTimestampped && s.Certificate.isHardCertificate)
{
r.result = true;
}
r.resultText = hm;
s.Results = r;
}
private static PdfPKCS7 VerifySignature(AcroFields fields, String name, ref MessageReport.Signature sigInfo)
{
sigInfo.isCoveringWholeDocument = fields.SignatureCoversWholeDocument(name);
PdfPKCS7 pkcs7 = fields.VerifySignature(name);
sigInfo.isIntegral = pkcs7.Verify();
X509Certificate[] certs = pkcs7.SignCertificateChain;
DateTime cal = pkcs7.SignDate;
IList <VerificationException> errors = CertificateVerification.VerifyCertificates(certs, certificates, null, cal);
if (errors == null)
{
Console.WriteLine("Certificates verified against the KeyStore");
}
else
{
foreach (object error in errors)
{
Console.WriteLine(error);
}
}
for (int i = 0; i < certs.Length; ++i)
{
X509Certificate cert = certs[i];
}
X509Certificate signCert = certs[0];
X509Certificate issuerCert = (certs.Length > 1 ? certs[1] : null);
sigInfo.Certificate = GetCertificateInfo(signCert, cal.ToLocalTime());
sigInfo.isValidDateSigning = CheckRevocation(pkcs7, signCert, issuerCert, cal);
sigInfo.isValidToday = CheckRevocation(pkcs7, signCert, issuerCert, DateTime.Now.AddDays(-1));
return(pkcs7);
}
private static MessageReport.Signature InspectSignature(AcroFields fields, String name, SignaturePermissions perms)
{
MessageReport.Signature sigInfo = new MessageReport.Signature();
IList<AcroFields.FieldPosition> fps = fields.GetFieldPositions(name);
if (fps != null && fps.Count > 0)
{
AcroFields.FieldPosition fp = fps[0];
Rectangle pos = fp.position;
if (pos.Width == 0 || pos.Height == 0)
{
sigInfo.visible = false;
}
else
{
sigInfo.visible = true;
}
}
PdfPKCS7 pkcs7 = VerifySignature(fields, name, ref sigInfo);
sigInfo.digestAlgorithm = pkcs7.GetHashAlgorithm();
sigInfo.encryptionAlgorithm = pkcs7.GetEncryptionAlgorithm();
sigInfo.isRevocationValid = pkcs7.IsRevocationValid();
X509Certificate cert = pkcs7.SigningCertificate;
sigInfo.signerName = CertificateInfo.GetSubjectFields(cert).GetField("CN");
if (pkcs7.SignName != null)
sigInfo.signerName = pkcs7.SignName;
sigInfo.signDate = pkcs7.SignDate.ToString("yyyy-MM-dd HH:mm:ss.ff");
if (!pkcs7.TimeStampDate.Equals(DateTime.MaxValue))
{
sigInfo.isTimestampped = true;
sigInfo.timestampDate = pkcs7.TimeStampDate.ToString("yyyy-MM-dd HH:mm:ss.ff");
TimeStampToken ts = pkcs7.TimeStampToken;
sigInfo.timestampName = ts.TimeStampInfo.Tsa.ToString();
}
sigInfo.signLocation = pkcs7.Location;
sigInfo.signReason = pkcs7.Reason;
PdfDictionary sigDict = fields.GetSignatureDictionary(name);
PdfString contact = sigDict.GetAsString(PdfName.CONTACTINFO);
if (contact != null)
Console.WriteLine("Contact info: " + contact);
perms = new SignaturePermissions(sigDict, perms);
sigInfo.signatureType = (perms.Certification ? "certification" : "approval");
return sigInfo;
}
public static bool validatePDF(string filename, ref MessageReport msg)
{
try
{
X509CertificateParser parser = new X509CertificateParser();
if (certificates.Count() == 0)
{
certificates.Add(parser.ReadCertificate(new FileStream(ROOT1, FileMode.Open)));
certificates.Add(parser.ReadCertificate(new FileStream(ROOT2, FileMode.Open)));
certificates.Add(parser.ReadCertificate(new FileStream(ROOT3, FileMode.Open)));
}
PdfReader pdfReader = new PdfReader(filename);
AcroFields acroFields = pdfReader.AcroFields;
List<String> signatureNames = acroFields.GetSignatureNames();
msg.signaturesCount = signatureNames.Count();
if (signatureNames.Count == 0)
{
msg.StatusText = "Δεν βρέθηκαν ψηφιακές υπογραφές στο έγγραφο!";
return false;
}
SignaturePermissions perms = null;
MessageReport.Signature sigInfo = new MessageReport.Signature();
foreach (String name in signatureNames)
{
sigInfo = InspectSignature(acroFields, name, perms);
UpdateSignatureResults(ref sigInfo); //produce human friendly result text
msg.Signatures.Add(sigInfo);
}
msg.StatusText = String.Format("Ο έλεγχος ολοκληρώθηκε επιτυχώς. Βρέθηκαν {0} ψηφιακές υπογραφές στο έγγραφο!", msg.signaturesCount);
return true;
}
catch
{
return false;
}
}
private static MessageReport.Signature InspectSignature(AcroFields fields, String name, SignaturePermissions perms)
{
MessageReport.Signature sigInfo = new MessageReport.Signature();
IList <AcroFields.FieldPosition> fps = fields.GetFieldPositions(name);
if (fps != null && fps.Count > 0)
{
AcroFields.FieldPosition fp = fps[0];
Rectangle pos = fp.position;
if (pos.Width == 0 || pos.Height == 0)
{
sigInfo.visible = false;
}
else
{
sigInfo.visible = true;
}
}
PdfPKCS7 pkcs7 = VerifySignature(fields, name, ref sigInfo);
sigInfo.digestAlgorithm = pkcs7.GetHashAlgorithm();
sigInfo.encryptionAlgorithm = pkcs7.GetEncryptionAlgorithm();
sigInfo.isRevocationValid = pkcs7.IsRevocationValid();
X509Certificate cert = pkcs7.SigningCertificate;
sigInfo.signerName = CertificateInfo.GetSubjectFields(cert).GetField("CN");
if (pkcs7.SignName != null)
{
sigInfo.signerName = pkcs7.SignName;
}
sigInfo.signDate = pkcs7.SignDate.ToString("yyyy-MM-dd HH:mm:ss.ff");
if (!pkcs7.TimeStampDate.Equals(DateTime.MaxValue))
{
sigInfo.isTimestampped = true;
sigInfo.timestampDate = pkcs7.TimeStampDate.ToString("yyyy-MM-dd HH:mm:ss.ff");
TimeStampToken ts = pkcs7.TimeStampToken;
sigInfo.timestampName = ts.TimeStampInfo.Tsa.ToString();
}
sigInfo.signLocation = pkcs7.Location;
sigInfo.signReason = pkcs7.Reason;
PdfDictionary sigDict = fields.GetSignatureDictionary(name);
PdfString contact = sigDict.GetAsString(PdfName.CONTACTINFO);
if (contact != null)
{
Console.WriteLine("Contact info: " + contact);
}
perms = new SignaturePermissions(sigDict, perms);
sigInfo.signatureType = (perms.Certification ? "certification" : "approval");
return(sigInfo);
}