On Sat, 14 May 2022 03:29:14 GMT, Anthony Scarpino <ascarp...@openjdk.org> 
wrote:

>> Hi,
>> 
>> I need a review of this fix to allow a read-only 'src' buffer to be used 
>> with SSLEngine.unwrap(). A temporary read-write buffer is created in the 
>> SSLCipher operation when a read-only buffer is passed. If the 'src' is 
>> read-write, there is no effect on the current operation
>> 
>> The PR also includes a CSR for an API implementation note to the 
>> SSLEngine.unwrap. The 'src' buffer may be modified during the decryption 
>> operation. 'unwrap()' has had this behavior forever, so there is no 
>> compatibility issue with this note. Using the 'src' buffer for in-place 
>> decryption was a performance decision.
>> 
>> Tony
>
> Anthony Scarpino has updated the pull request with a new target base due to a 
> merge or a rebase. The pull request now contains four commits:
> 
>  - review update
>  - update some nits
>  - PR ready
>  - Initial

There is too much grey area.  It says the src buffer maybe modified, which one 
could interpret it cannot be a read-only, but that would still need 
clarification to explicitly say "no read only buffers".  And other than these 
internal 'in-place' crypto reason, there is no API reason to not allow 
read-only buffers as input.
I did think about closing the CSR as the text was already there about the src 
buffer, even thought it was using a different term.  But I felt strongly enough 
that I wanted to prevent that confusion in the future.

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

PR: https://git.openjdk.java.net/jdk/pull/8462

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