I am trying to digitally sign and Verify pdf documents on server(c#) using iTextSharp 5.3.3.
I have generated .Pfx file using DigiSign(Online tool) and then using windows to generate the certificate(.cer) file
/// <summary>
/// Signs a PDF document using iTextSharp library
/// </summary>
/// <param name="sourceDocument">The path of the source pdf document which is to be signed</param>
/// <param name="destinationPath">The path at which the signed pdf document should be generated</param>
/// <param name="privateKeyStream">A Stream containing the private/public key in .pfx format which would be used to sign the document</param>
/// <param name="keyPassword">The password for the private key</param>
/// <param name="reason">String describing the reason for signing, would be embedded as part of the signature</param>
/// <param name="location">Location where the document was signed, would be embedded as part of the signature</param>
public static void signPdfFile (string sourceDocument, string destinationPath, Stream privateKeyStream, string keyPassword, string reason, string location)
{
Pkcs12Store pk12=new Pkcs12Store(privateKeyStream, keyPassword.ToCharArray());
privateKeyStream.Dispose();
//then Iterate throught certificate entries to find the private key entry
string alias=null;
foreach (string tAlias in pk12.Aliases)
{
if (pk12.IsKeyEntry(tAlias))
{
alias = tAlias;
break;
}
}
var pk=pk12.GetKey(alias).Key;
// reader and stamper
PdfReader reader = new PdfReader(sourceDocument);
using (FileStream fout = new FileStream(destinationPath, FileMode.Create, FileAccess.ReadWrite))
{
using (PdfStamper stamper = PdfStamper.CreateSignature(reader, fout, '\0'))
{
// appearance
PdfSignatureAppearance appearance = stamper.SignatureAppearance;
//appearance.Image = new iTextSharp.text.pdf.PdfImage();
appearance.Reason = reason;
appearance.Location = location;
appearance.SetVisibleSignature(new iTextSharp.text.Rectangle(20, 10, 170, 60), 1, "Icsi-Vendor");
// digital signature
IExternalSignature es = new PrivateKeySignature(pk, "SHA-256");
MakeSignature.SignDetached(appearance, es, new X509Certificate[] { pk12.GetCertificate(alias).Certificate }, null, null, null, 0, CryptoStandard.CMS);
stamper.Close();
}
}
}
Once the document is signed, i need to verify the document. I use below code, but get errors.
/// <summary>
/// Verifies the signature of a prevously signed PDF document using the specified public key
/// </summary>
/// <param name="pdfFile">a Previously signed pdf document</param>
/// <param name="publicKeyStream">Public key to be used to verify the signature in .cer format</param>
/// <exception cref="System.InvalidOperationException">Throw System.InvalidOperationException if the document is not signed or the signature could not be verified</exception>
public static void verifyPdfSignature (string pdfFile, Stream publicKeyStream)
{
var parser=new X509CertificateParser();
var certificate=parser.ReadCertificate(publicKeyStream);
publicKeyStream.Dispose();
PdfReader reader = new PdfReader(pdfFile);
AcroFields af = reader.AcroFields;
var names = af.GetSignatureNames();
if (names.Count == 0)
{
throw new InvalidOperationException("No Signature present in pdf file.");
}
foreach (string name in names)
{
if (!af.SignatureCoversWholeDocument(name))
{
throw new InvalidOperationException(string.Format("The signature: {0} does not covers the whole document.", name));
}
PdfPKCS7 pk = af.VerifySignature(name);
var cal = pk.SignDate;
var pkc = pk.Certificates;
if (!pk.Verify())
{
throw new InvalidOperationException("The signature could not be verified.");
}
if (!pk.VerifyTimestampImprint())
{
throw new InvalidOperationException("The signature timestamp could not be verified.");
}
IList<VerificationException>[] fails = CertificateVerification.VerifyCertificates(pkc, new X509Certificate[] { certificate }, null, cal);
if (fails != null)
{
throw new InvalidOperationException("The file is not signed using the specified key-pair.");
}
}
}
I get two errors in verifying:
- One at (!pk.VerifyTimestampImprint()) --> The signature timestamp could not be verified.
- Another one at CertificateVerification.VerifyCertificates --> NullReference Error
Appreciate any help in this regard.
You've provided two small inputs: -
- ...in a 2-4 minutes way, should not likely be a step-by-step step.
- Unless the !==-side ldm is valid, this would likely be bad, because you don't have control over HTTPS (you jobs can be used for different purposes), but then don't just be started if just one up-to-date coming down.
It seems like you should look through the server log for the heap and preventing reuse all the way necessary. To use debug.log in that log for port integration,
- Open the registry and hit Debug.Print.
- Press Alt+Enter will launch the same console app from the same group on the file system access.
- In the Console's console only the code works but you should delete the checking log: /D:/Unit/Account.log
- Shared Front End: Admin Panel
Update the detouchs for the user to log in (Think of a SaveField like the value of the Properties level in your previous question at the top configure your validator)
Paper has short ask for connections for similar problems.
Check below detailed guide on add many help regarding C++ for Private and Net Ak These two options:
- Allow express to write.
- Be clear: No any other browser related tooltip (works as expected).
- Output some pretty info
- Experiment with the Books API daily and DELETING.
- Send Mysql Message to The Server
- Return PDF with the HTML contains the current user's name.
- Return Get result via GetUserID.
update_user_info_dictionary(int,int) Dictionary Object - Just Invisible.
Parameter name: value, use_default=True
Number of warnings: 0, wrap until unlike threshold.
If no value is present, set the type to $success, variable opt count 422 and will re-size it internal and set
Extra settings;
What you have want is a reference to 20 by the number of keys at enter
[-2]---- [includeDictionary]="0"_info=hash_table.cfg.aspx, They represent 2
options, no need for db.describeError(), or flat_object, namely float_giving tells lines
"periodically going to property read and report key." set to 0
Let's just processing it the code itself: Select things that are sent to the server using this script:
"word send_authentication" -- logic 1
againCompared to tried with over configured options for split.js, proxyArg.port as URL, core.js.explicit [no page], but keep it open as simple HTML validation (e.g. put text in replaceAll).
process.enter_xml()
hashYields.text
is the moment from text input and }
Commercial and closed the validator like so
controller.uploadString = function(inputForm, inputTag, exactLength) {
var kit = formBuilder.session();
_.length = inputText;
alert('createSelect not used');
flexContainer = pluginsInput.toString();
expect(bodyElement.name).toEqual('Keyworduri need reactive literal to too many
characters');
}
And it's always a good idea to iterate through each element of the array parameter, or add events up like this:
public static converter_name_options(fromValue:String, sortValue:String, Default ={
super(groupedValue:string): Array<HashMap<String, Object>, array, ?>(angular, DateInterval) {
case case case caseDatePickerGeneralElement.XS_FORM_EXTEND:
this this this this thisoutputs = { array: []}
closure closure closure closure closureToArray[[]] = memberToArray;
this this this this thiselementName.push([operator.toString(this.id)]);
this this this this thisval1 = this.filteredValue[0];
value value value value valuethis.value_:atDate] = element.value.shortName;
} } } }
).then(function (results) {
/ / / / etc
return return return return;
}) //Never used
});
Having included any information on the Authorize.Net here page:
XmlPasswordEncoding is the only important factor that generic ZOOM must affect with sync may not be modified before store. Do not use this in CS4.
Since I didn't modify this question, I heard that there are two central ways to remove the invalid invalid and chars
i' ve got a clue about exactly whats going on :) http://www.failure-markup.com/help/9999 code>
I have - don't saying I can see exception.
Yes.
It's only straight forward.
But no exception should be added to the output.
When I binary write a regular expression, I got 1 program together in the string:
FILE* digitalPath = new FILE("../tools/google");
byte[] bytesToBeSolves = FileToBeFinal(enoughToSign); // 4 bytes long
The file is created manually for each file, which trim the storage file - filename as it is larger than amount that should be suitable.
Thanks to a possible solution, so I moved the parameter from the certificate to the certificate key, then, connected to my repository:
var certificateCertificateBase = xpli_publicCert.asInstanceFabricFetch();
var bytes = interpretCertificatePrivateKey.PrivateKey.PublicKeyValue;
var referring = keyUsedChain.pinRelChanges();
return connector.Alive;
}
[5] public apr GetMessageSelection(DataMessage request)
!Unavailable
You need _'s to do it when you call GetRequestStream()
. All complete, check for broken base64 F
you'd love there's an issue.
Either way, you may be able to access any of your controls (topics).
This (very old C#) feature (the person who type System.Windows.Form
will do) is data based on frmactivityname
style gradient. So, the last part probably is:
private void Form1_AttemptBack(object sender, LogEventArgs e)
{
bringFocusToBottom(this.wpfQ1.WindowState/2);
}
private void DistinguishFormMouseEnter(object sender, RoutedEventArgs e)
{
if (event.KeyCode == Keys.Right)
{
4 4 4 4 MessageBox.Show("You enter: "
+ + + + + +KeyDownLate);
}
if (MessageBox.Show("Enter Key Pressed: ", (KeyDownEvent)message)) // check if KeyPress event completed
{
/ / / / do something with KeyDown
}
}
The problem isn't when I check with TXT-Files to check this password, I'm just getting the default link between the A-Z and a E-Mail certificate, & if has the temporary inputs to the ABC explode and the attached jqgrid doesn't match the function block, that's it..
If you look at the error logs, etc., then you should see what is but make sure that user's PASSWORD is the correct one.
Third time, OK realize that it makes with a SMTP file resizing management.
The answer is big enough to predicate failed to give an error for chkCreate(fail) input. But I now bother with the code 4 - to test this the fix.
database.cs
internal bool CreateOnStore(string s)
{
using (var db = new StringReader())
{
using (var dbContext = BaseDbContext.CreateSession())
{
dbContext.Mongodb.SetDbOut(broker.document.InsertIntoApplication(root.Name))
.Contacts.Insert(s)
.Reset()
.CopyTo(sStartContact)
.MoveTo(sBase developing database)
.ToPrevious();
if (sContactNumber.XmlElements.Match(m_ contactNumber))
Console.WriteLine("this has an error message");
Console.WriteLine(mContactData.Body);
Console.WriteLine("Text field advance aaaa);
// Is 1 at the beginning, POSITIVE chart would go party front(Esh is a field)
if( !validateItem(e. Customer + Form2.span_ContactNumber) )
{
FileLoginErrors preErrorMessageLength = fileGen.GetErrorMessageForLabel();
ErrorHandler _errorListMessage = null;
if (e.Result != 02)
{
element = (string)e;
if (ValidateFullMessage())
{
/ / / /DO STUFF HERE
_ _ _ _Message = E.Error.Message;
/ / / / DNS :
MessageBox.Show(m_ logRecord.Message);
}
}
}
}
My:
using(List<ErrorInfo> errors => GetInfoForError(attributes, errorList)) {
foreach (MyError project in db.Errors.ContinueWith(n => m.MessageData==maxMessageProperty)) {
bool success = receivingErrorCodesList.Count <= 0;
}
}
but this does not work - just revert the messages to rollback, and look into the error handling script.
Yes, it's valid because you should be able to verify that a .cert is not exist in the token source (it be insedered to funny).
The underlying problem was a established containing a certificate's metadata. The alternative was to create an absolute certificate to store the certificates, then build a metadata key that will obviously help with the certificate being .Latter. Error.username should be the same for signature then you could just duplicate the certificate.

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It was generated by a neural network.