There is this java.lang.ArrayIndexOutOfBoundsException: 0 error appearing whenever I run my program which is RSA algorithm.
package cn;
import java.math.BigInteger;
import java.security.SecureRandom;
public class rsa
{
private final static BigInteger one = new BigInteger("1");
private final static SecureRandom random = new SecureRandom();
private BigInteger privateKey;
private BigInteger publicKey;
private BigInteger modulus;
rsa(int N)
{
BigInteger p = BigInteger.probablePrime(N/2, random);
BigInteger q = BigInteger.probablePrime(N/2, random);
BigInteger phi = (p.subtract(one)).multiply(q.subtract(one));
modulus = p.multiply(q);
publicKey = new BigInteger("65537");
privateKey = publicKey.modInverse(phi);
}
BigInteger encrypt(BigInteger message)
{
return message.modPow(publicKey, modulus);
}
BigInteger decrypt(BigInteger encrypted)
{
return encrypted.modPow(privateKey, modulus);
}
public String toString()
{
String s = "";
s += "public = " + publicKey + "\n";
s += "private = " + privateKey + "\n";
s += "modulus = " + modulus;
return s;
}
public static void main(String[] args)
{
int N = Integer.parseInt(args[0]);
rsa key = new rsa(N);
System.out.println(key);
BigInteger message = new BigInteger(N-1, random);
BigInteger encrypt = key.encrypt(message);
BigInteger decrypt = key.decrypt(encrypt);
System.out.println("message = " + message);
System.out.println("encrypted = " + encrypt);
System.out.println("decrypted = " + decrypt);
}
}
Can someone please help me out by finding where the error exist. In the eclipse IDE the error was pointed out at the 2nd line of the main function.rsa key = new rsa(N); <=This one
