Validating Digital Signatures using javascript

i have created a sign field and a button. if user doesnt fill the sign and presses the button,the a error msg should appear. i have written the following java script for tat.kinldy help.its not working.
if
(event.target.getField("data.page.SignatureField1").signatureInfo().name == null)
app.alert("fill signature");
note:the following code is written in button's click event.
: data.page.SignatureField1 is the signature field.

Hi,
Please check the Acrobat forum:http://forums.adobe.com/community/acrobat
If you are trying to modify a FormsCentral PDF form, you'll need to follow a few steps before you can edit it, please see:
http://forums.adobe.com/docs/DOC-3661
(please note that FormsCentral does not support signature currently)
Thanks,
Lucia

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That suggests that the installer is getting damaged during the download.
I'd first try downloading an installer from the Apple website using a different web browser:
http://www.apple.com/itunes/download/
If you use Firefox instead of IE for the download (or vice versa), do you get a working installer?

"valid digital signature" required????

I am trying to download a poker website that i have been using for years and i now get a message saying "...valid digital signature missing...". I don't understand. I would appreciate any help. Thanks

Sounds like your security settings for their site are missing - such as might happen when you delete temproary Internet files and cookies.
Best bet would be to call their support number.
If you have a secure password... then you can use the "unable to view secure web sites" steps in this document to "reset" secure connections:
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... an HP employee expressing his own opinion.
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No Valid Digital Signature

I'm trying to install the latest Itunes, but my computer won't let me becuase it keep saying that the publisher is unknown and the file was blocked becuase it does not have a valid digital signature that verifies it's publisher. I have no clue what to do. I have a Windows XP system.

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Try restarting your PC.
Using a different browser.
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These can be frustrating.
Try restarting your PC.
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TS3212 I have removed my pop-up blocker completely and still receive the following error message when attempting to download iTunes: "The file was blocked because it does not have a valid digital signature that verifies its publisher".....any ideas?

have removed my pop-up blocker completely and still receive the following error message when attempting to download iTunes: "The file was blocked because it does not have a valid digital signature that verifies its publisher".....any ideas?

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What is your operating system? What is your Reader version? What means "can not"?
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ASHISH

Regarding your first question about bookmarks, I think you discovered the answer in when you pressed the address bar. The second tab there has your bookmarks.
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W. Spu

Hi,
It looks like it is related with this
https://technet.microsoft.com/library/security/2749655
This issue might be caused by a missing timestamp Enhanced Key Usage (EKU) extension during certificate generation and signing of Microsoft core components and software.
Microsoft is aware of an issue involving specific digital certificates that were generated by Microsoft without proper timestamp attributes. These digital certificates were later used to sign some Microsoft core components and software binaries. This
could cause compatibility issues between affected binaries and Microsoft Windows. While this is not a security issue, because the digital signature on files produced and signed by Microsoft will expire prematurely, this issue could adversely impact the ability
to properly install and uninstall affected Microsoft components and security updates.
So have you applied this update on XP\Vista\Server 2003?
http://support.microsoft.com/kb/2749655
This update will help to ensure the continued functionality of all software that was signed with a specific certificate that did not use a timestamp Enhanced Key Usage (EKU) extension. To extend their functionality, WinVerifyTrust will ignore the lack of
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Yolanda Zhu
TechNet Community Support

Acrobat is not validating digital signature

Hi Everybody...
I have generated a pdf file which includes digital signatures.
But the acrobat is not validating the digital signature. But if
we open this file in PDF-xchange viewer, it shows that the
signatures are valid. Acrobat generates the following error...
Error during signature verification.
Signature contains incorrect, unrecognized, corrupted or
suspicious data.
Support Information: SigDict /Contents illegal data
What may be the problem?

Thank you Bernd for your kind and simple reply
I am uploading my file with my certificate which i am using for my digital
signatures. Please have a deep look at contents entry. Use ASNVIEWER or
decoder etc......
Thanks again and Best Regards

Add Digital Signature Using C# and Acrobat SDK

Hi everybody!
Please, how can I digitally sign PDF documents using Acrobat Professional 8 API and C# language?
I know that I need use JavaScript APIs (IAC) but I can't find anything really helpful in the Acrobat SDK Documentation. Could anyone post a sample of how use javascript manipulation inside C# (Framework 2.0), or give me a direction?
Thank in advance!

Hi Felipe,
when i am signing the document.
I believe i am missing something in my code. After executing the code to sign, when i open it i get "The following signature fields are not signed".
Please let me know where i m doing wrong?
Here is my VB.NET Code
Dim gapp As Acrobat.CAcroApp
Dim gpddoc As Acrobat.CAcroPDDoc
Dim jso As Object
gapp = CreateObject("acroexch.app")
gpddoc = CreateObject("acroexch.pddoc")
If gpddoc.Open("C:\Test1.pdf") Then
jso = gpddoc.GetJSObject()
jso.SetUserPassword("'testpassword12'")
'jso.ShowMyMessage("SetUserDigitalIDPath")
jso.SetUserDigitalIDPath("'c:\\DrTest.pfx'")
jso.app.execMenuItem("ADBESDK:AddSignature")
jso.AddSignature(jso)
gapp.Show()
and here is the javascript
// password to use the digital signature
var sigUserPwd = "UNKNOWN";
// to test the sample without user input, specify:
// var sigUserPwd = "testpassword";
// path to the digital signature file
var sigDigitalIDPath = "UNKNOWN";
// to test the sample without user input, specify:
//var sigDigitalIDPath = "/C/DrTest.pfx";
// other variables the user can modify
var sigHandlerName = "Adobe.PPKLite";
var sigFieldname = "sdkSignatureTest";
var sigReason = "I want to test my digital signature program.";
var sigLocation = "San Jose, CA";
var sigContactInfo = "[email protected]";
/* Add a menu item for AddSignature */
app.addMenuItem( { cName: "ADBESDK:AddSignature", cUser: "Add My Signature", cParent: "Advanced",
cEnable: "event.rc = (event.target != null);",
cExec: "AddSignature(event.target)" });
// main function
AddSignature=app.trustedFunction(function (doc)
app.beginPriv(); // explicitly raise privilege
// if sigDigitalIDPath is not spcified, ask for user input
if(sigDigitalIDPath == "UNKNOWN"){
var cResponse = app.response({
cQuestion: "Input your digital ID path:",
cTitle: "Digital Signature",
cDefault: "/C/DrTest.pfx",
if ( cResponse == null) {
app.alert("No input.");
return;
else
SetUserDigitalIDPath(cResponse);
// if sigUserPwd is not spcified, ask for user input
if(sigUserPwd == "UNKNOWN"){
var cResponse = app.response({
cQuestion: "Input your password:",
cTitle: "Digital Signature",
cDefault: "testpassword",
if ( cResponse == null) {
app.alert("No input.");
return
else
SetUserPassword(cResponse);
// create a new signature field
var signatureField = AddSignatureField(doc);
// sign it
if(signatureField) Sign(signatureField, sigHandlerName);
app.endPriv();
// create a signature field in the upper left conner with name of sigFieldname
function AddSignatureField(doc)
var inch=72;
var aRect = doc.getPageBox( {nPage: 0} );
aRect[0] += 0.5*inch; // from upper left hand corner of page.
aRect[2] = aRect[0]+2*inch; // Make it 2 inch wide
aRect[1] -= 0.5*inch;
aRect[3] = aRect[1] - 0.5*inch; // and 0.5 inch high
var sigField = null;
try {
sigField = doc.addField(sigFieldname, "signature", 0, aRect );
} catch (e) {
console.println("An error occurred: " + e);
return sigField;
// define the Sign function as a privileged function
Sign = app.trustedFunction (
function( sigField, DigSigHandlerName )
try {
app.beginPriv();
var myEngine = security.getHandler(DigSigHandlerName);
myEngine.login( sigUserPwd, sigDigitalIDPath);
sigField.signatureSign({oSig: myEngine,
bUI: false,
oInfo: { password: sigUserPwd,
reason: sigReason,
location: sigLocation,
contactInfo: sigContactInfo}
app.endPriv
} catch (e) {
console.println("An error occurred: " + e);
// set a correct password for using the signature, so you can quietly sign a doc.
function SetUserPassword(pwd)
sigUserPwd = pwd;
// set path to the digital signature file
function SetUserDigitalIDPath(idPath)
sigDigitalIDPath = idPath;
Sumit

PDF Digital Signature using SM2 Encryption

Hi,
Is there any way to use SM2 encryption for digital signature in PDF instead of the default encryption?
Thanks,
Amir Mehmood

Hi Lrosenth,
Could you please help me with the following questions regarding SM2 encryption.
1) Whether Adobe China supports SM2 algorithm inside their Chinese version of Adobe Reader. US version does not support SM2 algorithm so signature validation will fail even if we were to use SM2 algorithm in our PDFs. This will be a key question to ask Adobe China and how they support viewing/validating of signed PDFs.
2) We use iText library to digitally sign the PDF document. iText uses BouncyCastle library (http://bouncycastle.org/specifications.html) to perform the actual encryption. SM2 algorithm is not supported by BouncyCastle out-of-the-box so we will need to extend BouncyCastle by implementing SM2 and modifying iText (open source version) to use SM2 for digitally signing the PDF. This could be a non-trivial task. So, the question is how do the Chinese digitally sign their PDFs using SM2? Do they use a third-party library that we can license?
3) Does Adobe China provide a PDF Java library for programmatically modifying and signing a PDF which is "Chinese"-compliant?
Thank you

Validating Digital Signatures using javascript

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