Private key

Question

Hello people,
i'm creating a program that needs to generate private keys,
i've found out that java has built in libraries that support this so i've tried:
                KeyPairGenerator keyGen = KeyPairGenerator.getInstance("RSA");
                keyGen.initialize(1024);
                KeyPair keypair = keyGen.genKeyPair();
                PrivateKey privateKey = keypair.getPrivate();
                PublicKey publicKey = keypair.getPublic();but after i set the privateKey i can't find a way to retrieve the actual numbers used in the private key (probably to prevent attacks...)
eventually, all my app really needs, is a table of , lets say, 100 private keys (each one as 2 big primes)
is it possible for me to use the java.security to do that?
thanks for your time.

Answer 1

i still need small ones in the begining. a modolus in
the size of 16 DWORDS is too big for me right now, i
need something like 4.
i guess i have no escape but to generate them myself,
the problem is that i probably won't do it
professionaly :(Well - nobody will generate 32-bit RSA keys "professionally", because it'd take about 2 CPU minutes to break your keys when they're that small. 512 bits was acceptable in the eighties - current best-practice, IIRC, is 2048 bit keys for anything you're serious about protecting, and 4096-bit keys for anything you want to protect for extended periods of time.
Grant