On Tue, 19 Apr 2022 02:20:10 GMT, Valerie Peng <[email protected]> wrote:
>> src/java.base/share/classes/javax/crypto/Cipher.java line 1054:
>>
>>> 1052: * this cipher, or may contain additional default or random
>>> parameter
>>> 1053: * values used by the underlying cipher implementation if this
>>> cipher can
>>> 1054: * successfully generate the required parameter values when not
>>> supplied.
>>
>> A few comments:
>>
>> 1. I don't think this new text covers the case where the cipher is not
>> initialized with any parameters, but the provider returns parameters. I
>> tried to think of how to say that all in one sentence, but I think it is
>> best to have two sentences covering each case, ex:
>>
>> "If this cipher was not initialized with parameters, the returned parameters
>> may be null or may be ..."
>> "If this cipher was initialized with parameters, the returned parameters may
>> be the same or may be ..."
>>
>> 2. Should `Signature.getParameters` be updated to be consistent? Are there
>> any cases, or could there be, where a signature provider may return
>> additional parameters other than what the user specified?
>
> Hmm, I tried the suggested approach in (1), the result looks very lengthy.
> Actually, the Cipher.init(..) methods already has a few paragraphs describing
> the behavior for parameter generation, perhaps we should not repeat stating
> the "If this cipher was initialized" vs "was not initialized" since lengthy
> description may confuse users and have higher risks of inconsistency. What do
> you think?
> As for (2), currently only RSASSA-PSS signature impl uses parameters. When
> specified using PSSParameterSpec, it's possible that some of the parameters
> are not set, so it's possible for providers to use provider-specific default
> values for PSS case. So, yes, Signature class may have to updated in the same
> way to cover this particular scenario.
For (1), how about something like below:
> * <p>The returned parameters may be the same that were used to initialize
> * this cipher, or may contain additional default or random parameter
> * values used by the underlying cipher implementation. If no parameters
> * is supplied and this cipher successfully generated the required
> * parameter values, it will be returned. Otherwise, {@code null} is
> * returned.
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PR: https://git.openjdk.java.net/jdk/pull/8117
