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(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_CkCert.h> #include <C_CkXml.h> #include <C_CkStringBuilder.h> void ChilkatSample(void) { HCkCert cert; BOOL success; const char *extensionXmlStr; HCkXml xml; HCkStringBuilder sbDistPoint; cert = CkCert_Create(); success = CkCert_LoadFromFile(cert,"qa_data/certs/test_haswdt.cer"); if (success != TRUE) { printf("%s\n",CkCert_lastErrorText(cert)); CkCert_Dispose(cert); return; } // Get the CRL Distribution Points extension, which is at OID 2.5.29.31 extensionXmlStr = CkCert_getExtensionAsXml(cert,"2.5.29.31"); if (CkCert_getLastMethodSuccess(cert) == FALSE) { printf("Certificate does not have the CDP extension.\n"); CkCert_Dispose(cert); return; } xml = CkXml_Create(); CkXml_LoadXml(xml,extensionXmlStr); // See what we have.. printf("%s\n",CkXml_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 = CkStringBuilder_Create(); success = CkXml_GetChildContentSb(xml,"sequence|contextSpecific|contextSpecific|contextSpecific",sbDistPoint); if (success == TRUE) { CkStringBuilder_Decode(sbDistPoint,"base64","utf-8"); printf("CRL Distribution Point: %s\n",CkStringBuilder_getAsString(sbDistPoint)); } // Sample output: // CRL Distribution Point: http://crl.comodoca.com/COMODORSAClientAuthenticationandSecureEmailCA.crl CkCert_Dispose(cert); CkXml_Dispose(xml); CkStringBuilder_Dispose(sbDistPoint); } |
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