(dev/core#2258) CryptoRegistry - Add findKeysByTag()

Civi/Crypto/CryptoRegistry.php

@@ -226,6 +226,24 @@ public function findKey($keyIds) {
     throw new CryptoException("Failed to find key by ID or tag (" . implode(' ', $keyIds) . ")");
   }
 
+  /**
+   * Find all the keys that apply to a tag.
+   *
+   * @param string $keyTag
+   *
+   * @return array
+   *   List of keys, indexed by id, ordered by weight.
+   */
+  public function findKeysByTag($keyTag) {
+    $keys = array_filter($this->keys, function ($key) use ($keyTag) {
+      return in_array($keyTag, $key['tags'] ?? []);
+    });
+    uasort($keys, function($a, $b) {
+      return ($a['weight'] ?? 0) - ($b['weight'] ?? 0);
+    });
+    return $keys;
+  }
+
   /**
    * @param string $name
    * @return \Civi\Crypto\CipherSuiteInterface