pub type CK_C_GenerateKeyPair = Option<unsafe extern "C" fn(hSession: CK_SESSION_HANDLE, pMechanism: CK_MECHANISM_PTR, pPublicKeyTemplate: CK_ATTRIBUTE_PTR, ulPublicKeyAttributeCount: CK_ULONG, pPrivateKeyTemplate: CK_ATTRIBUTE_PTR, ulPrivateKeyAttributeCount: CK_ULONG, phPublicKey: CK_OBJECT_HANDLE_PTR, phPrivateKey: CK_OBJECT_HANDLE_PTR) -> CK_RV>;