diff -r c7c34916027a -r 177826044cd9 wp/wp-includes/sodium_compat/src/Core/Poly1305.php
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/wp/wp-includes/sodium_compat/src/Core/Poly1305.php	Mon Oct 14 18:28:13 2019 +0200
@@ -0,0 +1,63 @@
+<?php
+
+if (class_exists('ParagonIE_Sodium_Core_Poly1305', false)) {
+    return;
+}
+
+/**
+ * Class ParagonIE_Sodium_Core_Poly1305
+ */
+abstract class ParagonIE_Sodium_Core_Poly1305 extends ParagonIE_Sodium_Core_Util
+{
+    const BLOCK_SIZE = 16;
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param string $m
+     * @param string $key
+     * @return string
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function onetimeauth($m, $key)
+    {
+        if (self::strlen($key) < 32) {
+            throw new InvalidArgumentException(
+                'Key must be 32 bytes long.'
+            );
+        }
+        $state = new ParagonIE_Sodium_Core_Poly1305_State(
+            self::substr($key, 0, 32)
+        );
+        return $state
+            ->update($m)
+            ->finish();
+    }
+
+    /**
+     * @internal You should not use this directly from another application
+     *
+     * @param string $mac
+     * @param string $m
+     * @param string $key
+     * @return bool
+     * @throws SodiumException
+     * @throws TypeError
+     */
+    public static function onetimeauth_verify($mac, $m, $key)
+    {
+        if (self::strlen($key) < 32) {
+            throw new InvalidArgumentException(
+                'Key must be 32 bytes long.'
+            );
+        }
+        $state = new ParagonIE_Sodium_Core_Poly1305_State(
+            self::substr($key, 0, 32)
+        );
+        $calc = $state
+            ->update($m)
+            ->finish();
+        return self::verify_16($calc, $mac);
+    }
+}