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(Unicode C) Add a Document Timestamp Signature to an already-signed PDFSee more PDF Signatures ExamplesDemonstrates how to add a document timestamp signature to an already-signed PDF. Note: This example requires Chilkat v9.5.0.99 or greater.
#include <C_CkPdfW.h> #include <C_CkJsonObjectW.h> void ChilkatSample(void) { HCkPdfW pdf; BOOL success; HCkJsonObjectW json; // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. pdf = CkPdfW_Create(); // Load the PDF that has already been signed. success = CkPdfW_LoadFile(pdf,L"qa_data/pdf/helloWorld_signed.pdf"); if (success == FALSE) { wprintf(L"%s\n",CkPdfW_lastErrorText(pdf)); CkPdfW_Dispose(pdf); return; } json = CkJsonObjectW_Create(); CkJsonObjectW_UpdateBool(json,L"invisibleSignature",TRUE); CkJsonObjectW_UpdateString(json,L"subFilter",L"/ETSI.RFC3161"); CkJsonObjectW_UpdateBool(json,L"timestampToken.enabled",TRUE); // In this example, we'll use a free TSA server (timestamp.digicert.com), but you may want to use your own timestamp authority server. CkJsonObjectW_UpdateString(json,L"timestampToken.tsaUrl",L"http://timestamp.digicert.com"); // If the timestamp server requires a username/password, do the following. Otherwise omit the following few lines of code. CkJsonObjectW_UpdateString(json,L"timestampToken.tsaUsername",L"the_tsa_username"); CkJsonObjectW_UpdateString(json,L"timestampToken.tsaPassword",L"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.) CkJsonObjectW_UpdateBool(json,L"timestampToken.requestTsaCert",TRUE); success = CkPdfW_SignPdf(pdf,json,L"c:/temp/qa_output/helloWorld_signed_2.pdf"); if (success == FALSE) { wprintf(L"%s\n",CkPdfW_lastErrorText(pdf)); CkPdfW_Dispose(pdf); CkJsonObjectW_Dispose(json); return; } wprintf(L"Successfully added a Document Timestamp Signature to the PDF\n"); CkPdfW_Dispose(pdf); CkJsonObjectW_Dispose(json); } |
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