When szOID_SUBJECT_KEY_IDENTIFIER is used for the lpszStructType with CryptEncodeObject, CryptEncodeObjectEx, CryptDecodeObject, or CryptDecodeObjectEx the following details apply.
"2.5.29.14"
pvStructInfo points to a CRYPT_DATA_BLOB structure. See BLOB Structure.
The BLOB Structure contains an octet string, an arbitrary sequence of bytes.