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SHAExample.java
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SHAExample.java
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import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import java.security.InvalidKeyException;
import java.security.Key;
import java.security.NoSuchAlgorithmException;
import java.util.*;
public class SHAExample {
public static void main(String[] args) {
try {
// Generate a secret key for the HMAC algorithm
Scanner sc=new Scanner(System.in);
System.out.println("Enter secret key");
String secretKey = sc.nextLine();
// Replace with your secret key
System.out.println("Enter message"); // Message to be authenticated
String message =sc.nextLine();
// Generate HMAC for the message using SHA-256
byte[] hmac = generateHmacSHA256(secretKey, message.getBytes());
// Print the original message and HMAC
System.out.println("Original Message: " + message);
System.out.println("Generated HMAC: " + bytesToHex(hmac));
} catch (NoSuchAlgorithmException | InvalidKeyException e) {
e.printStackTrace();
}
}
// Function to generate an HMAC for the given message using SHA-256
private static byte[] generateHmacSHA256(String secretKey, byte[] message) throws NoSuchAlgorithmException, InvalidKeyException {
Key key = new SecretKeySpec(secretKey.getBytes(), "HmacSHA256");
Mac mac = Mac.getInstance("HmacSHA256");
mac.init(key);
return mac.doFinal(message);
}
// Function to convert byte array to hex string for better display
private static String bytesToHex(byte[] bytes) {
StringBuilder result = new StringBuilder();
for (byte b : bytes) {
result.append(String.format("%02x", b));
}
return result.toString();
}
}