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diff --git a/src/supplemental/websocket/base64.h b/src/supplemental/websocket/base64.h
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+//
+// Copyright (c) 2014 Wirebird Labs LLC.  All rights reserved.
+// Copyright 2020 Staysail Systems, Inc. <info@staysail.tech>
+//
+// 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.
+//
+
+#ifndef NNI_BASE64_INCLUDED
+#define NNI_BASE64_INCLUDED
+
+#include <stddef.h>
+#include <stdint.h>
+
+// Based on base64.c (Public Domain) by Jon Mayo.
+// Base64 is defined in RFC 2045, section 6.8.
+
+// This function encodes an arbitrary byte array into base64
+// null-terminated string.  It returns the number of characters
+// emitted.
+size_t nni_base64_encode(const uint8_t *, size_t, char *, size_t);
+
+// This function decodes a base64 string into supplied buffer.
+// It returns the number of bytes emitted.
+size_t nni_base64_decode(const char *, size_t, uint8_t *, size_t);
+
+#endif