Pkcs11(ArgumentsBad) Error while trying to use OAEP padding

[probablynachi]

I am currently learning implementations of pkcs11. While using the pkcs#1 1.5 padding the code worked perfectly, but while trying out OAEP padding it is throwing this error. I am attaching my OAEP parameters as a snippet. Any clue on where I am going wrong? i really appreciate the help.

fn main() -> Result<(), Box<dyn Error>> {

    let mut context = Pkcs11::new(PKCS11_LIB_PATH)?;
    context.initialize(CInitializeArgs::OsThreads)?;
    let session = context.open_rw_session(SLOT_ID.try_into()?)?;
    session.login(UserType::User, Some(PIN))?;
    let pub_key_template = [Attribute::ModulusBits(2048.into())];
    let (pubkey, _privkey) = session.generate_key_pair(&Mechanism::RsaPkcsKeyPairGen,
                                                       &pub_key_template, &[])?;
    const VOIDDATA: *const c_void = std::ptr::null();
        let encrypt_mechanism: Mechanism = Mechanism::RsaPkcsOaep(PkcsOaepParams {
            hash_alg: MechanismType::SHA1,
            mgf: PkcsMgfType::MGF1_SHA1,
            source: PkcsOaepSourceType::DATA_SPECIFIED,
            source_data: VOIDDATA,
            source_data_len: 0.into(),
        }
        );
        session.encrypt(&encrypt_mechanism, pubkey, b"Hello, world!")?;
        Ok(())
    }

The error message being:

I am using cryptoki version 0.4.1 and softhsm2.
Please let me know if i need to provide more info.

Issue got fixed in #165