RFR: 8261433: Better pkcs11 performance for libpkcs11:C_EncryptInit/libpkcs11:C_DecryptInit

[Prajwal Kumaraswamy]

On Fri, 22 Mar 2024 23:17:51 GMT, Valerie Peng <valeriep at openjdk.org> wrote:

> Now that we are going with the normative version first, maybe we should make additional changes to clean up the flow further?Say,
> 
> 1. update `jGCMParamsToCKGCMParamPtr(JNIEnv *env, jobject jParam, CK_ULONG *pLength)` to allocate the normative structure instead.
> 2. enhance `updateGCMParams(JNIEnv *env, CK_MECHANISM_PTR mechPtr)` to return a copy of mech pointer containing the non-normative structure.

If PKCS11 spec version is less than 2.40, we are retaining the same logic as it exists today. 
If we make the above changes then there will be a crash in NSS version 3.51 and below where PKCS11 2.20 spec is used.

However, I can optimze the code by introducing new boolean variable in C_DecryptInit and C_EncryptInit to indicate if we need to send normative struct. If so, I'll add a goto statement to updateGCM params.
I did not do this initially because in 11u and above I have seen goto being removed.

-------------

PR Comment: https://git.openjdk.org/jdk/pull/18425#issuecomment-2017320516