fixed issues with base64 length limit.

utils/verify_keys.php

@@ -0,0 +1,18 @@
+<?php
+// Load Sodium extension
+require __DIR__ . '/../vendor/autoload.php'; // Adjust the path to the autoload file
+
+// Base64 decode the public and private keys
+$publicKey = base64_decode('0HCO9Tm3JvvbK+J93PStb4/23HSxEZS9WUrWSjmLIz4=');
+$privateKey = base64_decode('s1cAUQfbxa6Q8lJxn90N6aKER17Ng9tD/gHpX+8x6drQcI71Obcm+9sr4n3c9K1vj/bcdLERlL1ZStZKOYsjPg==');
+
+// Derive the public key from the private key to check if they match
+$derivedPublicKey = sodium_crypto_sign_publickey_from_secretkey($privateKey);
+
+// Compare the derived public key with the provided public key
+if (hash_equals($publicKey, $derivedPublicKey)) {
+    echo "The public and private key pair match!" . PHP_EOL;
+} else {
+    echo "The public and private key pair do NOT match!" . PHP_EOL;
+}
+?>