(Objective-C) Add a Document Timestamp Signature to an already-signed PDF

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Demonstrates how to add a document timestamp signature to an already-signed PDF.

Note: This example requires Chilkat v9.5.0.99 or greater.

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#import <CkoPdf.h>
#import <CkoJsonObject.h>

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

CkoPdf *pdf = [[CkoPdf alloc] init];

// Load the PDF that has already been signed.
BOOL success = [pdf LoadFile: @"qa_data/pdf/helloWorld_signed.pdf"];
if (success == NO) {
    NSLog(@"%@",pdf.LastErrorText);
    return;
}

CkoJsonObject *json = [[CkoJsonObject alloc] init];

[json UpdateBool: @"invisibleSignature" value: YES];
[json UpdateString: @"subFilter" value: @"/ETSI.RFC3161"];

[json UpdateBool: @"timestampToken.enabled" value: YES];

// In this example, we'll use a free TSA server (timestamp.digicert.com), but you may want to use your own timestamp authority server.
[json UpdateString: @"timestampToken.tsaUrl" value: @"http://timestamp.digicert.com"];

// If the timestamp server requires a username/password, do the following.  Otherwise omit the following few lines of code.
[json UpdateString: @"timestampToken.tsaUsername" value: @"the_tsa_username"];
[json UpdateString: @"timestampToken.tsaPassword" value: @"the_tsa_password"];

// When requesting the timestamp token, ask the server to include its certificate in the timestamp token response.
// This allows for the timestamp server's certificate to be included in the LTV validation (i.e. if the timestamp server
// has an OCSP URL, then Chilkat will also do the OCSP request for the timestamp server's certificate.)
[json UpdateBool: @"timestampToken.requestTsaCert" value: YES];

success = [pdf SignPdf: json outFilePath: @"c:/temp/qa_output/helloWorld_signed_2.pdf"];
if (success == NO) {
    NSLog(@"%@",pdf.LastErrorText);
    return;
}

NSLog(@"%@",@"Successfully added a Document Timestamp Signature to the PDF");