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vendor/paragonie/constant_time_encoding/src/Base64DotSlashOrdered.php

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+<?php
+declare(strict_types=1);
+namespace ParagonIE\ConstantTime;
+
+/**
+ *  Copyright (c) 2016 - 2022 Paragon Initiative Enterprises.
+ *  Copyright (c) 2014 Steve "Sc00bz" Thomas (steve at tobtu dot com)
+ *
+ *  Permission is hereby granted, free of charge, to any person obtaining a copy
+ *  of this software and associated documentation files (the "Software"), to deal
+ *  in the Software without restriction, including without limitation the rights
+ *  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *  copies of the Software, and to permit persons to whom the Software is
+ *  furnished to do so, subject to the following conditions:
+ *
+ *  The above copyright notice and this permission notice shall be included in all
+ *  copies or substantial portions of the Software.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ *  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ *  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ *  SOFTWARE.
+ */
+
+/**
+ * Class Base64DotSlashOrdered
+ * ./[0-9][A-Z][a-z]
+ *
+ * @package ParagonIE\ConstantTime
+ */
+abstract class Base64DotSlashOrdered extends Base64
+{
+    /**
+     * Uses bitwise operators instead of table-lookups to turn 6-bit integers
+     * into 8-bit integers.
+     *
+     * Base64 character set:
+     * [.-9]      [A-Z]      [a-z]
+     * 0x2e-0x39, 0x41-0x5a, 0x61-0x7a
+     *
+     * @param int $src
+     * @return int
+     */
+    protected static function decode6Bits(int $src): int
+    {
+        $ret = -1;
+
+        // if ($src > 0x2d && $src < 0x3a) ret += $src - 0x2e + 1; // -45
+        $ret += (((0x2d - $src) & ($src - 0x3a)) >> 8) & ($src - 45);
+
+        // if ($src > 0x40 && $src < 0x5b) ret += $src - 0x41 + 12 + 1; // -52
+        $ret += (((0x40 - $src) & ($src - 0x5b)) >> 8) & ($src - 52);
+
+        // if ($src > 0x60 && $src < 0x7b) ret += $src - 0x61 + 38 + 1; // -58
+        $ret += (((0x60 - $src) & ($src - 0x7b)) >> 8) & ($src - 58);
+
+        return $ret;
+    }
+
+    /**
+     * Uses bitwise operators instead of table-lookups to turn 8-bit integers
+     * into 6-bit integers.
+     *
+     * @param int $src
+     * @return string
+     */
+    protected static function encode6Bits(int $src): string
+    {
+        $src += 0x2e;
+
+        // if ($src > 0x39) $src += 0x41 - 0x3a; // 7
+        $src += ((0x39 - $src) >> 8) & 7;
+
+        // if ($src > 0x5a) $src += 0x61 - 0x5b; // 6
+        $src += ((0x5a - $src) >> 8) & 6;
+
+        return \pack('C', $src);
+    }
+}