[openssl-users] OpenSSL SHA algorithm

[Swapnil Deshpande]

Thanks all, this has been really helpful.

On Tue, Dec 26, 2017 at 5:44 AM, Kurt Roeckx <kurt at roeckx.be> wrote:

> On Mon, Dec 25, 2017 at 07:44:58PM -0800, Swapnil Deshpande wrote:
> > Hi all,
> >
> > Noob here. I recently discovered that the "-sha1" and "-sha" flags in the
> > "openssl dgst" command produce different outputs. I thought those were
> the
> > same algorithms but turns out they are not:
> >
> > $ echo -n "password" | openssl dgst -sha
> >
> > 80072568beb3b2102325eb203f6d0ff92f5cef8e
> >
> >
> > $ echo -n "password" | openssl dgst -sha1
> >
> > 5baa61e4c9b93f3f0682250b6cf8331b7ee68fd8
> >
> >
> > I am aware of SHA1 and the SHA-128 algorithm.
> >
> >
> > 1. What algorithm is used to generate hash when I use the "-sha" option?
>
> It's the original SHA algorithm, which people will now refer to as
> SHA-0. It has some minor but important changes compared to SHA-1.
>
> > 2. What could I have done to get this answer to #1 in a better way? I am
> > asking this because I tried to find what algorithm is being used through
> > the "help" option as well as trying to search via "man openssl" but
> > couldn't find anything. I also did a basic search for "openssl sha vs
> sha1"
> > and couldn't find any relevant results. If there was a better way to know
> > more about this option (say by reading some documentation), I'd be glad
> to
> > know about it.
>
> I started a pull request:
> https://github.com/openssl/openssl/pull/4979
>
> There are probably other changes that should happen.
>
>
> Kurt
>
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