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(Unicode C) Sign PDF with Timestamp from TSA (Timestamp Server Authority)See more PDF Signatures ExamplesThis example demonstrates how to a sign a PDF that is both long-term validation (LTV) enabled and includes a validating timestamp from a TSA (Timestamp Server Authority). Note: This example requires Chilkat v9.5.0.85 or greater.
#include <C_CkPdfW.h> #include <C_CkJsonObjectW.h> #include <C_CkCertW.h> void ChilkatSample(void) { HCkPdfW pdf; BOOL success; HCkJsonObjectW json; HCkCertW cert; // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. pdf = CkPdfW_Create(); // Load a PDF to be signed. // The "hello.pdf" is available at https://chilkatsoft.com/hello.pdf success = CkPdfW_LoadFile(pdf,L"qa_data/pdf/hello.pdf"); if (success == FALSE) { wprintf(L"%s\n",CkPdfW_lastErrorText(pdf)); CkPdfW_Dispose(pdf); return; } // Options for signing are specified in JSON. json = CkJsonObjectW_Create(); // In most cases, the signingCertificateV2 and signingTime attributes are required. CkJsonObjectW_UpdateInt(json,L"signingCertificateV2",1); CkJsonObjectW_UpdateInt(json,L"signingTime",1); // Tell Chilkat to create an LTV-enabled (long term validation) signature. // See PDF Long-Term Validation (LTV) Signature Example for more detailed comments about "ltvOcsp". CkJsonObjectW_UpdateBool(json,L"ltvOcsp",TRUE); // Tell Chilkat to request a timestamp from a TSA server and include the timestamp token (1.2.840.113549.1.9.16.2.14) // in the CMS signature's authentication attributes 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); // Define the appearance of the signature. CkJsonObjectW_UpdateInt(json,L"page",1); CkJsonObjectW_UpdateString(json,L"appearance.y",L"top"); CkJsonObjectW_UpdateString(json,L"appearance.x",L"left"); CkJsonObjectW_UpdateString(json,L"appearance.fontScale",L"10.0"); CkJsonObjectW_UpdateString(json,L"appearance.text[0]",L"Digitally signed by: cert_cn"); CkJsonObjectW_UpdateString(json,L"appearance.text[1]",L"current_dt"); CkJsonObjectW_UpdateString(json,L"appearance.text[2]",L"This is an LTV-enabled signature with a TSA timestamp."); // Load the signing certificate. (Use your own certificate.) cert = CkCertW_Create(); success = CkCertW_LoadPfxFile(cert,L"qa_data/pfx/myPdfSigningCert.pfx",L"pfxPassword"); if (success == FALSE) { wprintf(L"%s\n",CkCertW_lastErrorText(cert)); CkPdfW_Dispose(pdf); CkJsonObjectW_Dispose(json); CkCertW_Dispose(cert); return; } // Tell the pdf object to use the certificate for signing. success = CkPdfW_SetSigningCert(pdf,cert); if (success == FALSE) { wprintf(L"%s\n",CkPdfW_lastErrorText(pdf)); CkPdfW_Dispose(pdf); CkJsonObjectW_Dispose(json); CkCertW_Dispose(cert); return; } success = CkPdfW_SignPdf(pdf,json,L"qa_output/hello_ltv_signed_with_timestamp.pdf"); if (success == FALSE) { wprintf(L"%s\n",CkPdfW_lastErrorText(pdf)); CkPdfW_Dispose(pdf); CkJsonObjectW_Dispose(json); CkCertW_Dispose(cert); return; } wprintf(L"The PDF has been successfully cryptographically signed with TSA timestamp and long-term validation.\n"); // If you open the Signature Panel in Adobe Acrobat, it will indicate that the signature is LTV enabled // and contains an embedded timestamp: CkPdfW_Dispose(pdf); CkJsonObjectW_Dispose(json); CkCertW_Dispose(cert); } |
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