first commit

public/typo3conf/ext/femanager/Classes/Utility/HashUtility.php

@@ -0,0 +1,47 @@
+<?php
+
+declare(strict_types=1);
+namespace In2code\Femanager\Utility;
+
+use In2code\Femanager\Domain\Model\User;
+
+/**
+ * Class HashUtility
+ */
+class HashUtility extends AbstractUtility
+{
+    /**
+     * Check if given hash is correct
+     *
+     * @param string $hash
+     * @param User $user
+     * @return bool
+     */
+    public static function validHash(string $hash, User $user, string $suffix = '')
+    {
+        return self::createHashForUser($user, $suffix) === $hash;
+    }
+
+    /**
+     * Create hash for a user
+     *
+     * @param User $user
+     * @return string
+     */
+    public static function createHashForUser(User $user, string $suffix = '')
+    {
+        return self::hashString($user->getUsername() . $suffix);
+    }
+
+    /**
+     * Create Hash from String and TYPO3 Encryption Key (if available)
+     *
+     * @param string $string Any String to hash
+     * @param int $length Hash Length
+     * @return string $hash Hashed String
+     */
+    protected static function hashString($string, $length = 16)
+    {
+        return substr(md5($string . self::getEncryptionKey()), 0, $length);
+    }
+}