RFR: 8209038: Clarify the javadoc of Cipher.getParameters()

[Valerie Peng]

On Wed, 6 Apr 2022 16:00:10 GMT, Xue-Lei Andrew Fan <xuelei at openjdk.org> wrote:

>> Anyone can help review this javadoc update? The main change is the wording for the method javadoc of Cipher.getParameters()/CipherSpi.engineGetParameters(). The original wording is somewhat restrictive and request is to broaden this to accommodate more scenarios such as when null can be returned.
>> The rest are minor things like add {@code } to class name and null, and remove redundant ".". 
>> 
>> Will file CSR after the review is close to being wrapped up.
>> Thanks~
>
> src/java.base/share/classes/javax/crypto/Cipher.java line 1053:
> 
>> 1051:      * <p>If this cipher has been previously initialized with parameters,
>> 1052:      * this method returns the same parameters. Otherwise, this method may
>> 1053:      * return a combination of user-supplied, default and randomly generated
> 
>> ... a combination of user-supplied, default and randomly generated parameter values ...
> 
> Other than init(), which APIs could impact the user-supplied parameters?  Is it the getInstance()?
> 
> Is it OK to just use the provider-specific default values instead, by replacing the "a combination of user-supplied, default and randomly generated ..."?

I am thinking just init() as it takes parameters.
Let me take a second look at various Cipher algorithm implementations and see if this can be further pared down.

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PR: https://git.openjdk.java.net/jdk/pull/8117