SignifyD Webhook JSON Validation (Java)

signifyd-webhook.java

// Use JDK 1.8.0_66
// Test here to make life easy: https://www.jdoodle.com/online-java-compiler/

import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import java.security.NoSuchAlgorithmException;
import java.security.InvalidKeyException;
import javax.xml.bind.DatatypeConverter;

public class Main {
	public static void main(String[] args) {
		try {
			String key = "decryption key";
			String jsonBody = "{\"escape\":\"quotes\"}";
			
			Mac sha256HMAC = Mac.getInstance("HmacSHA256");
			sha256HMAC.init(new SecretKeySpec(key.getBytes(), "HmacSHA256"));
			
			// Output for debugging
			System.out.println(key.getBytes());
			
			byte[] hash = sha256HMAC.doFinal(jsonBody.getBytes());

			// Output for debugging
			System.out.println(hash);

			// to base64
			System.out.println(DatatypeConverter.printBase64Binary(hash));
		}
		catch (NoSuchAlgorithmException e) {}
		catch (InvalidKeyException e) {}
	}
}