import java.math.BigInteger;
import java.security.KeyFactory;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.RSAPrivateKeySpec;
import java.security.spec.RSAPublicKeySpec;
import javax.crypto.Cipher;
public class BaseRSAExample
{
public static void main( String[] args ) throws Exception
{
byte[] input = new byte[] { (byte)0xbe, (byte)0xef };
Cipher cipher = Cipher.getInstance("RSA/None/NoPadding", "BC");
KeyFactory keyFactory = KeyFactory.getInstance("RSA", "BC");
RSAPublicKeySpec pubKeySpec = new RSAPublicKeySpec( new BigInteger("d46f473a2d746537de2056ae3092c451", 16),
new BigInteger("11", 16));
RSAPrivateKeySpec privKeySpec = new RSAPrivateKeySpec(
new BigInteger("d46f473a2d746537de2056ae3092c451", 16),
new BigInteger("57791d5430d593164082036ad8b29fb1", 16));
RSAPublicKey pubKey = (RSAPublicKey)keyFactory.generatePublic(pubKeySpec);
RSAPrivateKey privKey = (RSAPrivateKey)keyFactory.generatePrivate(privKeySpec);
System.out.println("input : " + Utils.toHex(input) );
cipher.init(Cipher.ENCRYPT_MODE, pubKey);
byte[] cipherText = cipher.doFinal(input);
System.out.println("cipher: " + Utils.toHex(cipherText));
cipher.init(Cipher.DECRYPT_MODE, privKey);
byte[] plainText = cipher.doFinal(cipherText);
System.out.println("plain : " + Utils.toHex(plainText));
}
}