Sounds like you want HMAC.

http://www.cryptolounge.org/wiki/HMAC
http://www.cryptopp.com/fom-serve/cache/82.html

HTH,

Geoff

On Jan 30, 2008 11:23 AM, mihailo <[EMAIL PROTECTED]> wrote:
>
> Hello.
>
> I would like to know if there exists some hashing function that uses a
> key for calculating a result. Or, is there any hash function H with
> the following description : H(data, key1) does not produce the same
> result as H(data, key2) ?
>
> Similar as encryption, but its result should not be reversible.
>
> Thanks in advance,
> Mihailo
> >
>

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