Some little help with RSA encryp

REDDemon · Post by **REDDemon** » Tue Mar 22, 2011 12:14 pm

Hi I need some help in founding some C/C++ RSA opensource encryption libraries. (i need something that works on arrays of bites only. So i need only a stand-alone code that doesn't require any external library for compiling)

I want to be able doing followings things

1) generate a public and a private key from two given random prime numbers (i have about 6 Gigabytes of primes stored on my Harddisk so i don't have problems for giving the function those numbers...).

2) encrypt a data array (int*, lenght) with the public key
3) decrypt the data array using the private key.

of course if possible i want that keys lenght, and arrays lenght is not fixed but can be choosed as you wish (at least at compile time).

Can anyone help me? thanks. i 've been searching for that in last half-hour and didn't find anything. I will continue searching now.

hendu · Post by **hendu** » Tue Mar 22, 2011 1:14 pm

Nobody usually encrypts with RSA, it's too heavy. The usual procedure is to encrypt with a regular cipher, and encrypt that key with RSA.

Same effect really; sorry if this doesn't bring you any closer to the solution. But many block ciphers are easily available in small files, with liberal licenses. I recommend blowfish.

hybrid · Post by **hybrid** » Tue Mar 22, 2011 1:43 pm

AES code is even included in the Irrlicht SDK.

REDDemon · Post by **REDDemon** » Wed Mar 23, 2011 9:41 am

Yeah i was thinkin to use RSA for key encryption only. Blowfish seems the symmetric algorithm i was searching for. at a first look it is better than the old algorithm. Thanks.

There is still the problem of using RSA