The createPKCS10 method creates a base64 encoded PKCS10 (in BSTR form) that can be submitted to a certificate server, requesting that a certificate be issued to the person/entity whose information is supplied in the PKCS10.
[VB] void createPKCS10( BSTR DNName, BSTR Usage ); [C++] HRESULT createPKCS10( BSTR DNName, // in BSTR Usage // in );
The purpose OID is just passed through to the PKCS10 request. For general extensibility and ease of understanding, the control does not attempt to understand specific purpose OIDs. Therefore if you specify a Client Auth OID, the generated keys will still be a signature key, not an exchange key.
The return value from createPKCS10 is a base64 encoded PKCS10 request (in BSTR form). The format is such so that it can be directly posted to a WEB server for processing.
By default, the Microsoft Base Cryptographic Provider is used, PROV_RSA_FULL is the provider type, a signature key is created, and a unique new key set is created.