Thanks a lot Jos, it looks promising. The only drawback is that it does not support public keys in the format modulus-exponent, so I will have to ask them.

>>Hi all,
>>
>>can some one recommend me a encryption library which can handle RSA encryption and digital certificates? It should be able to handle keys in modulus-exponent format as well as PEM format.
>>
>>Thanks in advance,
>>Javier.
>
>
>TracyH mentioned this link the other day: http://www.cryptosys.net - It looks like it does what you're looking for.