New hashing algorithms.

lib/HashAlgorithm/Base/Utils.php

@@ -0,0 +1,56 @@
+<?php
+/**
+ * Nextcloud - user_sql
+ * Copyright (C) 2018 Marcin Łojewski <dev@mlojewski.me>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+namespace OCA\UserSQL\HashAlgorithm\Base;
+
+/**
+ * Cryptographic utilities trait.
+ * @author Marcin Łojewski <dev@mlojewski.me>
+ */
+trait Utils
+{
+    /**
+     * Convert hexadecimal message to its base64 form.
+     * @param $hex string Hexadecimal encoded message.
+     * @return string Same message encoded in base64.
+     */
+    private static function hexToBase64($hex)
+    {
+        $hexChr = '';
+        foreach (str_split($hex, 2) as $hexPair) {
+            $hexChr .= chr(hexdec($hexPair));
+        }
+        return base64_encode($hexChr);
+    }
+
+    /**
+     * Generate random string from given alphabet.
+     * @param $length int Output string length.
+     * @param $alphabet string Output string alphabet.
+     * @return string Random string from given alphabet.
+     */
+    private static function randomString($length, $alphabet)
+    {
+        $string = "";
+        for ($i = 0; $i != $length; ++$i) {
+            $string .= $alphabet[mt_rand(0, strlen($alphabet) - 1)];
+        }
+        return $string;
+    }
+}