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(Unicode C) Get Certificate CRL Distribution PointsDemonstrates how to get a certificate's CRL Distribution Points extension data (assuming it exists). In the vast majority of cases, there will be one CRL Distribution Point. Note: This example requires Chilkat v9.5.0.76 or greater.
#include <C_CkCertW.h> #include <C_CkXmlW.h> #include <C_CkStringBuilderW.h> void ChilkatSample(void) { HCkCertW cert; BOOL success; const wchar_t *extensionXmlStr; HCkXmlW xml; HCkStringBuilderW sbDistPoint; cert = CkCertW_Create(); success = CkCertW_LoadFromFile(cert,L"qa_data/certs/test_haswdt.cer"); if (success != TRUE) { wprintf(L"%s\n",CkCertW_lastErrorText(cert)); CkCertW_Dispose(cert); return; } // Get the CRL Distribution Points extension, which is at OID 2.5.29.31 extensionXmlStr = CkCertW_getExtensionAsXml(cert,L"2.5.29.31"); if (CkCertW_getLastMethodSuccess(cert) == FALSE) { wprintf(L"Certificate does not have the CDP extension.\n"); CkCertW_Dispose(cert); return; } xml = CkXmlW_Create(); CkXmlW_LoadXml(xml,extensionXmlStr); // See what we have.. wprintf(L"%s\n",CkXmlW_getXml(xml)); // We should get XML like this: // <?xml version="1.0" encoding="utf-8" ?> // <sequence> // <sequence> // <contextSpecific tag="0" constructed="1"> // <contextSpecific tag="0" constructed="1"> // <contextSpecific tag="6" constructed="0">aHR0cDovL2NybC5jb21vZG9jYS5jb20vQ09NT0RPUlNBQ2xpZW50QXV0aGVudGljYXRpb25hbmRTZWN1 // cmVFbWFpbENBLmNybA==</contextSpecific> // </contextSpecific> // </contextSpecific> // </sequence> // </sequence> // // Assuming there is one CRL Distribution Point... sbDistPoint = CkStringBuilderW_Create(); success = CkXmlW_GetChildContentSb(xml,L"sequence|contextSpecific|contextSpecific|contextSpecific",sbDistPoint); if (success == TRUE) { CkStringBuilderW_Decode(sbDistPoint,L"base64",L"utf-8"); wprintf(L"CRL Distribution Point: %s\n",CkStringBuilderW_getAsString(sbDistPoint)); } // Sample output: // CRL Distribution Point: http://crl.comodoca.com/COMODORSAClientAuthenticationandSecureEmailCA.crl CkCertW_Dispose(cert); CkXmlW_Dispose(xml); CkStringBuilderW_Dispose(sbDistPoint); } |
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