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import java.util.*; import java.util.Scanner; class HD { public static void main(String[] args) { long P, G, x, a, y, b, ka, kb; Scanner sc = new Scanner(System.in); System.out.println("Both the users should be agreed upon the public keys G and P"); System.out.println("Enter value for public key G:"); G = sc.nextLong(); System.out.println("Enter value for public key P:"); P = sc.nextLong(); System.out.println("Enter value for private key a selected by user1:"); a = sc.nextLong(); System.out.println("Enter value for private key b selected by user2:"); b = sc.nextLong(); x = calculatePower(G, a, P); y = calculatePower(G, b, P); ka = calculatePower(y, a, P); kb = calculatePower(x, b, P); System.out.println("Secret key for User1 is:" + ka); System.out.println("Secret key for User2 is:" + kb); } private static long calculatePower(long x, long y, long P) { long result = 0; if (y == 1){ return x; } else{ result = ((long)Math.pow(x, y)) % P; return result; } } }
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