You might also want to look into using nCipher HSMs:

http://www.ncipher.com/products/index.html

I can get you doc (or answer your questions) on our APIs if you'd like...

--John

> -----Original Message-----
> From: Secure Programming Mailing List
> [mailto:SECPROGSECURITYFOCUS.COM]On Behalf Of Seth Arnold
> Sent: Monday, April 30, 2001 4:00 PM
> To: SECPROGSECURITYFOCUS.COM
> Subject: Re: RSA
>
>
> [Adam, please wrap your lines at 72 characters. Thanks.]
>
> * Adam Berent <adminIDEVELOPERONLINE.COM> [010430 09:15]:
> > When implementing the RSA algorithm how do you handle large numbers
> > such as a 448 bit modulus. Aren't the unsigned long data types too
> > small for that. Is there a special number math library that people
> > use?
>
> Unsigned long is often 64 bits. One comes up very short with this few
> bits. GMP is one answer. However, if you are thinking of implementing
> RSA yourself, I would ask you to consider using OpenSSL's RSA support
> before you start work. Chances are good they will have done a better job
> than you in their implementation. Another option is Wei Dai's Crypto++.
> His license is often very amenable to companies. :)
>
> If speed is an issue, look into IBM's 4758 cryptography accelerator. Sun
> has a similar product. Both companies should provide APIs for their
> products that you can use. They likely use their own arbitrary precision
> libraries to take advantage of the hardware.
>
> I hope this helps.
>
> --
> Earthlink: The #1 provider of unsolicited bulk email to the Internet.

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