L_DicomVerifySignature

L_INT DicomVerifySignatureExample( 
   HDICOMDS hDS, 
   pDICOMELEMENT pSignatureItem) 
{ 
   L_TCHAR szMsg[1024] = TEXT(""); 
 
   // The Digital Signature UID 
   L_TCHAR* pszSignatureUID; 
 
   // The Digital Signature DateTime 
   pVALUEDATETIME pSignatureDateTime; 
 
   // The MAC Calculation Transfer Syntax UID 
   L_TCHAR* pszMacTransferSyntax; 
 
   // The MAC Algorithm 
   L_TCHAR* pszMacAlgorithm; 
 
   // Verify the Digital Signature; if pSignatureItem is NULL, the function 
   // will verify all the Digital Signatures that exist in the Data Set 
   L_UINT16 uRet = L_DicomVerifySignature(hDS,pSignatureItem,0); 
   switch (uRet) 
   { 
   case DICOM_SUCCESS: 
      if (pSignatureItem) 
      { 
         MessageBox(NULL, 
                     TEXT("The Digital Signature was verified."), 
                     TEXT("Sample"), 
                     MB_OK); 
      } 
      else 
      { 
         MessageBox(NULL, 
                      TEXT("All Digital Signatures were verified (if there are any)."), 
                      TEXT("Sample"), 
                      MB_OK); 
         return uRet; 
      } 
      break; 
 
   case DICOM_ERROR_INVALID_SIGNATURE: 
      if (pSignatureItem) 
      { 
         MessageBox(NULL, 
                      TEXT("The Digital Signature is invalid."), 
                      TEXT("Sample"), 
                      MB_OK); 
      } 
      else 
      { 
         MessageBox(NULL, 
                      TEXT("At least one Digital Signature is invalid."), 
                      TEXT("Sample"), 
                      MB_OK); 
      } 
      return uRet; 
 
   default: 
      wsprintf(szMsg, TEXT("An error occurred [Error: %hu]."), uRet); 
      MessageBox(NULL, szMsg, TEXT("Sample"), MB_OK); 
      return uRet; 
   } 
 
   pszSignatureUID = L_DicomGetSignatureUID(hDS,pSignatureItem); 
   if (pszSignatureUID) 
      wsprintf(szMsg, TEXT("Digital Signature UID: %s\n"), pszSignatureUID); 
 
   pSignatureDateTime = L_DicomGetSignatureDateTime(hDS,pSignatureItem); 
   if (pSignatureDateTime) 
   { 
      wsprintf(szMsg, TEXT("%sDigital Signature DateTime: %02hu/%02hu/%04hu %02hu:%02hu:%02hu.%06lu %c%04li\n"), 
               szMsg, 
               pSignatureDateTime->nMonth, 
               pSignatureDateTime->nDay, 
               pSignatureDateTime->nYear, 
               pSignatureDateTime->nHours, 
               pSignatureDateTime->nMinutes, 
               pSignatureDateTime->nSeconds, 
               pSignatureDateTime->nFractions, 
               (pSignatureDateTime->nOffset >= 0) ? '+' : '-', 
               pSignatureDateTime->nOffset); 
   } 
    
   pszMacTransferSyntax = L_DicomGetMacTransferSyntax(hDS,pSignatureItem); 
   if (pszMacTransferSyntax) 
   { 
      wsprintf(szMsg, TEXT("%sMAC Calculation Transfer Syntax UID: %s\n"), 
               szMsg, 
               pszMacTransferSyntax); 
   } 
    
   pszMacAlgorithm = L_DicomGetMacAlgorithm(hDS,pSignatureItem); 
   if (pszMacAlgorithm) 
   { 
      wsprintf(szMsg, TEXT("%sMAC Algorithm: %s\n"), 
               szMsg, 
               pszMacAlgorithm); 
   } 
 
   // The Data Elements Signed 
   if (L_DicomGetSignedElementsCount(hDS,pSignatureItem) > 0) 
   { 
      // We will display only one 
      pDICOMELEMENT pSignedElement; 
 
      lstrcat(szMsg, TEXT("Data Elements Signed: "));       
      pSignedElement = L_DicomGetSignedElement(hDS,pSignatureItem, 0); 
      if (pSignedElement) 
      { 
         wsprintf(szMsg, TEXT("%s(%04X,%04X), ..."), 
                  szMsg, 
                  GETGROUP(pSignedElement->nTag), 
                  GETELEMENT(pSignedElement->nTag)); 
      } 
 
      lstrcat(szMsg, TEXT("\n")); 
   } 
 
   lstrcat(szMsg, TEXT("\nDo you want to save the Certificate of Signer?")); 
 
   // Display the information we have about the Digital Signature 
   if (MessageBox(NULL, szMsg, TEXT("Sample"), MB_YESNO) == IDYES) 
   { 
      // Save the Certificate of Signer 
      uRet = L_DicomSaveCertificate(hDS,pSignatureItem, MAKE_IMAGE_PATH(TEXT("CertOfSigner.cer")),DICOM_CERTIFICATE_FORMAT_PEM); 
      if (uRet != DICOM_SUCCESS) 
         return uRet; 
   } 
 
   return DICOM_SUCCESS; 
}