The structures contained in this section are associated with X.509 CERT_EXTENSION structures. They are created when an encoded Value member of an CERT_EXTENSION structure is decoded using a call to CryptDecodeObject. The type of structure that is created depends on the string value residing in the CERT_EXTENSION structure's pszObjId member at the time of the call.
Currently defined extension object identifiers are shown in the following table.
| Predefined Constant | Object identifier | Value | Data structure |
|---|---|---|---|
| X509_AUTHORITY_INFO_ACCESS | szOID_AUTHORITY_INFO_ACCESS | "1.3.6.1.5.5.7.1.1" | CERT_AUTHORITY_INFO_ACCESS |
| X509_AUTHORITY_KEY_ID | szOID_AUTHORITY_KEY_IDENTIFIER | "2.5.29.1" | CERT_AUTHORITY_KEY_ID_INFO |
| X509_KEY_ATTRIBUTES | szOID_KEY_ATTRIBUTES | "2.5.29.2" | CERT_KEY_ATTRIBUTES_INFO |
| X509_KEY_USAGE_RESTRICTION | szOID_KEY_USAGE_RESTRICTION | "2.5.29.4" | CERT_KEY_USAGE_RESTRICTION_INFO |
| None | szOID_POLICY_MAPPINGS | "2.5.29.5" | Not implemented |
| X509_ALTERNATE_NAME | szOID_SUBJECT_ALT_NAME | "2.5.29.7" | CERT_ALT_NAME_INFO |
| X509_ALTERNATE_NAME | szOID_ISSUER_ALT_NAME | "2.5.29.8" | CERT_ALT_NAME_INFO |
| None | szOID_SUBJECT_DIR_ATTRS | "2.5.29.9" | Not implemented |
| X509_BASIC_CONSTRAINTS | szOID_BASIC_CONSTRAINTS | "2.5.29.10" | CERT_BASIC_CONSTRAINTS_INFO |
| X509_KEY_USAGE | szOID_KEY_USAGE | "2.5.29.15" | CRYPT_BIT_BLOB |
| X509_BASIC_CONSTRAINTS2 | szOID_BASIC_CONSTRAINTS2 | "2.5.29.19" | CERT_BASIC_CONSTRAINTS2_INFO |
| X509_CERT_POLICIES | szOID_CERT_POLICIES | "2.5.29.32" | CERT_POLICIES_INFO |