parallaxsecond/rust-cryptoki

AI Summary: Improve the `cryptoki` Rust wrapper to properly handle vendor-defined PKCS #11 error codes (CKR_VENDOR_DEFINED and above). Currently, these are mapped to a generic error; the task involves modifying the error handling to distinguish and report these vendor-specific errors, likely using a new error variant like `RvError::VendorDefined(code)`. This requires understanding the PKCS #11 specification and the existing `cryptoki` error handling mechanism.