When X509_DSS_PARAMETERS or szOID_OIWSEC_dsa are used for the lpszStructType with CryptEncodeObject, CryptEncodeObjectEx, CryptDecodeObject, or CryptDecodeObjectEx the following details apply.
"1.3.14.3.2.12"
pvStructInfo points to a CERT_DSS_PARAMETERS structure. See it for additional details.