Thanks all, this has been really helpful.
On Tue, Dec 26, 2017 at 5:44 AM, Kurt Roeckx <kurt@xxxxxxxxx> 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 It's the original SHA algorithm, which people will now refer to as
>
>
> $ 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?
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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