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diff --git a/src/microhttpd/md5_ext.h b/src/microhttpd/md5_ext.h
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+/*
+     This file is part of GNU libmicrohttpd
+     Copyright (C) 2022 Evgeny Grin (Karlson2k)
+
+     GNU libmicrohttpd is free software; you can redistribute it and/or
+     modify it under the terms of the GNU Lesser General Public
+     License as published by the Free Software Foundation; either
+     version 2.1 of the License, or (at your option) any later version.
+
+     This library 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
+     Lesser General Public License for more details.
+
+     You should have received a copy of the GNU Lesser General Public
+     License along with GNU libmicrohttpd.
+     If not, see <http://www.gnu.org/licenses/>.
+*/
+
+/**
+ * @file microhttpd/md5_ext.h
+ * @brief  Wrapper declarations for MD5 calculation performed by TLS library
+ * @author Karlson2k (Evgeny Grin)
+ */
+
+#ifndef MHD_MD5_EXT_H
+#define MHD_MD5_EXT_H 1
+
+#include "mhd_options.h"
+#include <stdint.h>
+#ifdef HAVE_STDDEF_H
+#include <stddef.h>  /* for size_t */
+#endif /* HAVE_STDDEF_H */
+
+/**
+ * Size of MD5 resulting digest in bytes
+ * This is the final digest size, not intermediate hash.
+ */
+#define MD5_DIGEST_SIZE (16)
+
+/* Actual declaration is in GnuTLS lib header */
+struct hash_hd_st;
+
+/**
+ * Indicates that struct Md5CtxExt has 'ext_error'
+ */
+#define MHD_MD5_HAS_EXT_ERROR 1
+
+/**
+ * MD5 calculation context
+ */
+struct Md5CtxExt
+{
+  struct hash_hd_st *handle; /**< Hash calculation handle */
+  int ext_error; /**< Non-zero if external error occurs during init or hashing */
+};
+
+/**
+ * Indicates that MHD_MD5_init_one_time() function is present.
+ */
+#define MHD_MD5_HAS_INIT_ONE_TIME 1
+
+/**
+ * Initialise structure for MD5 calculation, allocate resources.
+ *
+ * This function must not be called more than one time for @a ctx.
+ *
+ * @param ctx the calculation context
+ */
+void
+MHD_MD5_init_one_time (struct Md5CtxExt *ctx);
+
+
+/**
+ * MD5 process portion of bytes.
+ *
+ * @param ctx the calculation context
+ * @param data bytes to add to hash
+ * @param length number of bytes in @a data
+ */
+void
+MHD_MD5_update (struct Md5CtxExt *ctx,
+                const uint8_t *data,
+                size_t length);
+
+
+/**
+ * Indicates that MHD_MD5_finish_reset() function is available
+ */
+#define MHD_MD5_HAS_FINISH_RESET 1
+
+/**
+ * Finalise MD5 calculation, return digest, reset hash calculation.
+ *
+ * @param ctx the calculation context
+ * @param[out] digest set to the hash, must be #MD5_DIGEST_SIZE bytes
+ */
+void
+MHD_MD5_finish_reset (struct Md5CtxExt *ctx,
+                      uint8_t digest[MD5_DIGEST_SIZE]);
+
+/**
+ * Indicates that MHD_MD5_deinit() function is present
+ */
+#define MHD_MD5_HAS_DEINIT 1
+
+/**
+ * Free allocated resources.
+ *
+ * @param ctx the calculation context
+ */
+void
+MHD_MD5_deinit (struct Md5CtxExt *ctx);
+
+#endif /* MHD_MD5_EXT_H */