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Re: SHA1Digest and SHA256Digest
From: |
Federico Montesino Pouzols |
Subject: |
Re: SHA1Digest and SHA256Digest |
Date: |
Wed, 20 Nov 2002 11:12:22 +0100 |
User-agent: |
Mutt/1.4i |
Hi,
On Tue, Nov 19, 2002 at 03:54:49PM -0600, Elizabeth Barham wrote:
> Dear Everyone on this list,
>
> I wrote SHA1Digest and SHA256Digest classes that interface with the
> Digest class and I would like to contribute it to the library.
>
> If this is okay with you all, I would then like to post them onto
> this mailing list, although I do have one question.
>
Good. I think these classes fit perfectly with cc++.
> Do you believe it is proper for the digest classes to throw
> exceptions in CommonC++? There are only two instances that I would
> like to add exceptions, but they are important:
>
> 1) After calculating a Digest, the "calculating sum" is corrupted
> in that one should *not* continue to feed the object data. If
> after the sum has been made and the client tries to give the
> object data, I would like to throw a "Digest All Ready
> Calculated" exception.
>
> Note that this should not hinder one from copying the object and
> extracting the sum from the *copy* and then continue to use the
> original.
>
> 2) There is a size limit as to how much data a digest may represent
> (for SHA1 and SHA256, this is 2^64). Going over this limit
> should cause a "Digest Overflow" exception.
>
> I currently have not implemented the exceptions except that they
> are in pseudo-code just waiting to be written. Nor have I written the
> copy construtors although the compiler generated ones may work fine
> (this needs to be verified).
>
Personally, I think that adding the two exception cases is ok.
> So, provided this is something the administrators are interested in
> allowing into the MAIN branch, should the exceptions be raised? (The
> size currently just loops over and there is no check on a corrupted
> sum.)
>
Umm, I think these two classes are suitable for both 1.0 and
1.1 series. I would say that they could be added along with a short
demo/test app, regardless of whether exceptions are included or not.
> Thank you,
>
> Elizabeth
>
>
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