eventwebhook/EventWebhook.java

Provides utilities to verify SendGrid event webhook signatures using ECDSA.

// Source: https://github.com/sendgrid/sendgrid-java | License: MIT | Copyright 2026, Twilio SendGrid, Inc. <help@twilio.com>
// Provided via justclaw.it.com; keep this notice with the code.
package com.sendgrid.helpers.eventwebhook;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.security.*;
import java.security.interfaces.ECPublicKey;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.X509EncodedKeySpec;
import java.util.Base64;

/**
 * This class allows you to easily use the Event Webhook feature. Read the docs
 * for more details:
 * https://sendgrid.com/docs/for-developers/tracking-events/event.
 */
public class EventWebhook {
    /**
     * Convert the public key string to a ECPublicKey.
     *
     * @param publicKey: verifica

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