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(Unicode C) Sign a PDF using Certificate from Windows Certificate StoreSee more PDF Signatures ExamplesThis example demonstrates how to a sign a PDF using a certificate from the Windows Certificate Store. 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); // Put the signature on page 1, top left CkJsonObjectW_UpdateInt(json,L"page",1); CkJsonObjectW_UpdateString(json,L"appearance.y",L"top"); CkJsonObjectW_UpdateString(json,L"appearance.x",L"left"); // Use a font scale of 10.0 CkJsonObjectW_UpdateString(json,L"appearance.fontScale",L"10.0"); // In this example, the appearance of the digital signature will contain three lines: // 1) The signing certificate's common name // 2) The current date/time // 3) Some arbitrary text. // The keyword "cert_cn" is replaced with the Certificate's Subject Common Name. // The keyword "current_dt" is replaced with the current date/time. // Any number of appearance text lines can be added. 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"The crazy brown fox jumps over the lazy dog."); // Load a certificate by specifying the common name ("CN" part of the certificate's Subject) cert = CkCertW_Create(); success = CkCertW_LoadByCommonName(cert,L"Xyz Widgets, Inc."); 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_signed.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.\n"); CkPdfW_Dispose(pdf); CkJsonObjectW_Dispose(json); CkCertW_Dispose(cert); } |
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