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(Unicode C) Get PDF Signer CertsSee more PDF Signatures ExamplesThis example demonstrates how to validate the signatures in a PDF and also shows how to get each signature's signer certificate. Note: This example requires Chilkat v9.5.0.87 or greater.
#include <C_CkPdfW.h> #include <C_CkJsonObjectW.h> #include <C_CkCertW.h> void ChilkatSample(void) { HCkPdfW pdf; BOOL success; HCkJsonObjectW sigInfo; int numSignatures; BOOL validated; HCkCertW cert; int i; // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. pdf = CkPdfW_Create(); // Load a PDF that has cryptographic signatures to be validated success = CkPdfW_LoadFile(pdf,L"qa_data/pdf/sign_testing_1/helloSigned2.pdf"); if (success == FALSE) { wprintf(L"%s\n",CkPdfW_lastErrorText(pdf)); CkPdfW_Dispose(pdf); return; } // Each time we verify a signature, information about the signature is written into // sigInfo (replacing whatever sigInfo previously contained). sigInfo = CkJsonObjectW_Create(); // Iterate over each signature and validate each. numSignatures = CkPdfW_getNumSignatures(pdf); validated = FALSE; cert = CkCertW_Create(); i = 0; while (i < numSignatures) { validated = CkPdfW_VerifySignature(pdf,i,sigInfo); wprintf(L"Signature %d validated: %d\n",i,validated); // The GetSignerCert method was added in Chilkat v9.5.0.87 // After calling VerifySignature, you can get the signer certificate by calling // GetSignerCert with the same index. success = CkPdfW_GetSignerCert(pdf,i,cert); if (success != FALSE) { wprintf(L"PDF signer certificate: %s\n",CkCertW_subjectDN(cert)); } i = i + 1; } wprintf(L"Finished.\n"); CkPdfW_Dispose(pdf); CkJsonObjectW_Dispose(sigInfo); CkCertW_Dispose(cert); } |
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