How can I use RSA on a file?

While we are on the topic, I have often found in the literature that RSA is NOT used to encrypt/decrypt large chunck of data, instead its used to encrypt the session key of the block cipher. I failed to understand why this is so ?? other than the speed constraint, what other reason could it possibly be ???

[SheepShagger]

If you're really interested in finding out the ins and outs of RSA and cryptography in general, follow these simple steps:

1) go to http://www.google.com/

2) type rsa faq

3) click on I'm Feeling Lucky

4) read with gusto

Extra credit: check out http://mywebpage.netscape.com/cryptobench/

[NoRG]

I decided upload some sources. It's on Dephi/Pascal,
but with samples/help and source code.
You can easy translate to C++.
Implemtation of DES, ECC, MD5, RIPE-MD, SHA included.
Good old TMS units.
Sorry, no RSA, but I hope it's be useful to somebody.
If I find RSA related, i share it on this forum.

I used MD5 instead of CRC, based on this sources.

lots of source code examples on h++p://www.planetsourcecode.com/ in many langs.

[NoRG]

Look at _hxxp://triade.studentenweb.org/GInt/gint.html.

"FGInt is a package I wrote in Delphi & Free Pascal to handle Fast Gigantic Integers, the size of these integers is merely bounded by the available memory."

RSA, ElGamal, DSA, GOSTDSA, ECC ElGamal, ECDSA and Prime generation implementation. With sources.