+ case X509_V_ERR_SUBJECT_ISSUER_MISMATCH:
+ return("subject issuer mismatch");
+ case X509_V_ERR_AKID_SKID_MISMATCH:
+ return("authority and subject key identifier mismatch");
+ case X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH:
+ return("authority and issuer serial number mismatch");
+ case X509_V_ERR_KEYUSAGE_NO_CERTSIGN:
+ return("key usage does not include certificate signing");
+