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Re: Streaming - [Re: CryptoOperation and its life cycle]

From: Ryan Sleevi <sleevi@google.com>
Date: Fri, 14 Dec 2012 10:52:58 -0800
Message-ID: <CACvaWvZPX=_1-+ZC=H72cnTjTxnydMobmtKQbZ5ZUM0j1z0EQg@mail.gmail.com>
To: Aymeric Vitte <vitteaymeric@gmail.com>
Cc: public-webcrypto-comments@w3.org
On Fri, Dec 14, 2012 at 3:29 AM, Aymeric Vitte <vitteaymeric@gmail.com> wrote:
>
> Le 13/12/2012 23:34, Ryan Sleevi a écrit :
>
>> For all of the supported digest functions, there is an explicit
>> finalization step, as dictated by the algorithm definition, which involves
>> padding and including the length. That is, there is NEVER any output that
>> returns a "partial" hash
>
> I am not talking about a partial hash output.
>
> To be clear, the question is how to do what is here
> https://github.com/Ayms/node-Tor/blob/master/src/crypto.cc#l396-416 ( what
> is commented was the initial behavior, ie close the hash after digest, I did
> modify it to keep the state before digest and process it again after digest)
> or here https://gitweb.torproject.org/tor.git/blob/HEAD:/src/common/crypto.c
> (lines 1578-1587, same thing)
>
> Again, that's a real life use case for streaming used/requested not by
> myself only, see next email too.

Then what you want has nothing to do with "streaming", nor
"progressive", nor "multi-part".

What you want has nothing to do with the behaviour/implementation of .process()

What you want relates to ISSUE-22 (
http://www.w3.org/2012/webcrypto/track/issues/22 ): Cloning.

It's very clear you're cloning the digest context via the call to
EVP_MD_CTX_copy. That is the same as a clone method.

>
>
> --
> jCore
> Email :  avitte@jcore.fr
> GitHub : https://www.github.com/Ayms
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>
Received on Friday, 14 December 2012 18:53:27 GMT

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