Re: calculating the MD5 hash of role passwords in C

## Matthias Apitz (guru(at)unixarea(dot)de):

> > The documentation on pg_authid has the details:
> > "The MD5 hash will be of the user's password concatenated to their user name."
> > https://www.postgresql.org/docs/12/catalog-pg-authid.html
>
> This is still not exactly what I was looking for. But has an interesting
> detail (salting the role password by adding the role name to it). An
> implementation with UNIX crypt(3) for MD5 would need an additional salt
> like '$1$salt' to encrypt 'sisis123sisis'.

It's not crypt(3). It's "the MD5 hash of the user's password concatenated
to their user name".
Try:
perl -MDigest::MD5 -e 'print("md5" . Digest::MD5::md5_hex("sisis123" . "sisis") . "\n");'

Regards,
Christoph

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