[jdk17] RFR: 8265500: Some impls of javax.crypto.Cipher.init() do not throw UnsupportedOperationExc for unsupported modes

[Valerie Peng]

On Wed, 16 Jun 2021 18:10:05 GMT, Valerie Peng <valeriep at openjdk.org> wrote:

>> src/jdk.crypto.cryptoki/share/classes/sun/security/pkcs11/P11AEADCipher.java line 365:
>> 
>>> 363:             default:
>>> 364:                 // should never happen; checked by Cipher.init()
>>> 365:                 throw new AssertionError("Unknown mode: " + opmode);
>> 
>> This update looks good to me.  But there is a potential issues, maybe for all switch statements.  If the cipher modes is extended to support more items, we may have to look for and update all the switch uses and make sure there is no broken.  Anyway, for my personal understanding, there is nothing we could do right now.
>
> Right, if new modes are added, we need to go through all cipher impl and update the switch statements. This change is just to make sure our handling is consistent.

Thanks much for the review~

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PR: https://git.openjdk.java.net/jdk17/pull/69