1 files changed, 46 insertions, 0 deletions
diff --git a/src/Base32Hex.php b/src/Base32Hex.php
new file mode 100644
index 0000000..fde2644
--- /dev/null
+++ b/src/Base32Hex.php
@@ -0,0 +1,46 @@
+<?php
+namespace ParagonIE\ConstantTime;
+
+/**
+ * Class Base32Hex
+ * [0-9][A-V]
+ *
+ * @package ParagonIE\ConstantTime
+ */
+abstract class Base32Hex extends Base32
+{
+    /**
+     * Base64 character set:
+     * [0-9]      [A-V]
+     * 0x30-0x39, 0x41-0x56
+     *
+     * @param int $src
+     * @return int
+     */
+    protected static function decode5Bits($src)
+    {
+        $ret = -1;
+
+        // if ($src > 0x30 && $src < 0x3a) ret += $src - 0x2e + 1; // -47
+        $ret += (((0x2f - $src) & ($src - 0x3a)) >> 8) & ($src - 47);
+
+        // if ($src > 0x40 && $src < 0x57) ret += $src - 0x41 + 10 + 1; // -54
+        $ret += (((0x40 - $src) & ($src - 0x57)) >> 8) & ($src - 54);
+
+        return $ret;
+    }
+
+    /**
+     * @param int $src
+     * @return string
+     */
+    protected static function encode5Bits($src)
+    {
+        $src += 0x30;
+
+        // if ($src > 0x39) $src += 0x41 - 0x3a; // 7
+        $src += ((0x39 - $src) >> 8) & 7;
+
+        return \pack('C', $src);
+    }
+}
+\ No newline at end of file