> This fix intends to eliminate additional library call to C_EncryptInit or 
> C_DecryptInit for Ciphers running through the CKM_AES_GCM.
> 
> Background: 
> 
> There are two types of CK_GCM_PARAMS struct that are used, one with IV bits 
> and the other without it.
> 
> Initially there was issue in NSS library, due to the struct being different 
> in header and spec version.
> NSS was using version from header but Solaris and SoftHsm was using normative 
> version from spec.
> To maintain compatibility Java used to try library call with non-normative 
> (header) version first and then upon failure retrial was made with updated 
> GCM struct with IV bits.
> 
> Note: Trying normative (spec) version first with NSS library results in JVM 
> crash.
> 
> Refer below for more information:
> https://github.com/openjdk/jdk/blob/master/src/jdk.crypto.cryptoki/share/native/libj2pkcs11/pkcs11gcm2.h#L36
>   
> 
> However NSS has fixed this to use normative/spec version since 3.52 which has 
> spec version 2.40
> Solaris and SoftHSM was already complying to the version mentioned in spec 
> 2.40
> 
> The fix now check if spec version is 2.40 and then makes library call with 
> appropriate structure.
> 
> Internal testing is green, further I have done internal testing manually with 
> NSS library 3.96, 3.76, 3.51 (non-normative spec), 3.52 and 3.53
> Results are attached 
> [nss_logs.zip](https://github.com/openjdk/jdk/files/14692787/nss_logs.zip)
> 
> Our existing tests like sun/security/pkcs11/Cipher/TestKATForGCM.java already 
> tests the functionality and I have used the same for internal testing

Prajwal Kumaraswamy has updated the pull request incrementally with one 
additional commit since the last revision:

  use getversion instead to get spec version

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/18425/files
  - new: https://git.openjdk.org/jdk/pull/18425/files/7efefc1a..542f74f0

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18425&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18425&range=02-03

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/18425.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18425/head:pull/18425

PR: https://git.openjdk.org/jdk/pull/18425

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