Java tutorial
import java.security.KeyPair; import java.security.KeyPairGenerator; import java.security.PrivateKey; import java.security.PublicKey; public class Main { public static void main(String[] argv) throws Exception { String algorithm = "DSA"; // or RSA, DH, etc. // Generate a 1024-bit Digital Signature Algorithm (DSA) key pair KeyPairGenerator keyGen = KeyPairGenerator.getInstance(algorithm); keyGen.initialize(1024); KeyPair keypair = keyGen.genKeyPair(); PrivateKey privateKey = keypair.getPrivate(); PublicKey publicKey = keypair.getPublic(); String format = privateKey.getFormat(); // PKCS#8 format = publicKey.getFormat(); // X.509 } }