Re: Hash function of strings
- To: mathgroup at smc.vnet.net
- Subject: [mg95066] Re: Hash function of strings
- From: Joseph Gwinn <joegwinn at comcast.net>
- Date: Mon, 5 Jan 2009 03:27:38 -0500 (EST)
- References: <email@example.com> <firstname.lastname@example.org>
In article <gjqa2r$3aa$1 at smc.vnet.net>,
"Sjoerd C. de Vries" <sjoerd.c.devries at gmail.com> wrote:
> I don't think it's possible. Hash works on Mathematica expressions and
> there is no way that a string expression can be converted to an
> expression consisting of its binary equivalent only. If there would be
> a structure "binary sequence" or so, it must have a Head in
> Mathematica designating it as such and then we're back at something
> like the string problem.
> Cheers --Sjoerd
> On Jan 3, 12:55 pm, Nacho <ncc1701... at gmail.com> wrote:
> > Hello all.
> > I'm trying to calculate the MD5 Hash function of a series of strings
> > and I'm getting different results from the "true" MD5.
> > I have searched the group and I have found that the Hash function is
> > including the " " of the strings. A solution is proposed, creating a
> > temporary file and then using FileHash.
> > My problem is that I want to calculate the Hash of about one million
> > strings, so creating temporary files is impossible.
> > Can you think in a method to calculate the Hash very quickly, without
> > the " "?
> > Thanks a lot.
A million hashes? Performance will also be an issue.
Use MathLink to access one of the standard C-coded MD5 functions via
some C glue code that will strip the quotes, et al.
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