encryption/decryption implementation

Hi all
I'm looking for an encryption/decryption implementation, did'nt find any source for rsa.
I found a complete source sor SHA1 which works but I think that there's no source for decrytion for this mehtod.
I found also that's possible to use the crypt.h library
It would be great if you provide me a link for the rsa code and/or where i can download the crypt.h library

Thanks & best regards
The encyption source on this website isn't too bad either. It's pretty basic, but has the ability to be more complex if you expand. I found it quite fun experimenting.
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