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Hello Luiz,
thanks for the help. Your code is most surely correct.
But this
(which should reproduce the sha1-rsa library using bc)  is not working
(the decrypted message is not the one I'm expecting to see).

Maybe I cannot use your url2bc to convert any hexadecimal value to
bc's big-int, can i ?

Also, assuming  it works, I'm not sure how a reversible operation
(bc2url) is possible.

On Wed, Mar 17, 2010 at 1:45 PM, Luiz Henrique de Figueiredo
<> wrote:
>> Those hex values represent urls as returned by :
> Try this:
> require"bc"
> function url2bc(url)
>        local x=bc.number(0)
>        for i=1,#url do
>                x=16*x+url:byte(i)
>        end
>        return x
> end
> print(url2bc("";))