diff --git a/src/microhttpd/md5_ext_openssl.c b/src/microhttpd/md5_ext_openssl.c
index 13298f3d..53f68ccb 100644
--- a/src/microhttpd/md5_ext_openssl.c
+++ b/src/microhttpd/md5_ext_openssl.c
@@ -25,22 +25,22 @@
  */
 
 #include <openssl/crypto.h>
-#include "md5_ext.h"
+#include "md5_ext_openssl.h"
 #include "mhd_assert.h"
 
 void
-MHD_MD5 (struct Md5CtxExt *ctx,
+MHD_MD5 (struct Md5CtxExt_OpenSSL *c,
          const unsigned char *d,
          size_t n)
 {
   unsigned char *md;
   if (NULL == MD5 (d, n, md))
   {
-    ctx->ext_error = 1;
+    c->ext_error = 1;
   }
   else
   {
-    ctx->ext_error = 0;
-    memcpy (ctx->handle, md, sizeof(ctx->H));
+    c->ext_error = 0;
+    memcpy (c->hash, md, sizeof(ctx->H));
   }
 }
diff --git a/src/microhttpd/md5_ext_openssl.h b/src/microhttpd/md5_ext_openssl.h
new file mode 100644
index 00000000..db77196d
--- /dev/null
+++ b/src/microhttpd/md5_ext_openssl.h
@@ -0,0 +1,57 @@
+/*
+     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 Édouard LEFIZELIER
+ */
+
+#ifndef MHD_MD5_EXT_OPENSSL_H
+#define MHD_MD5_EXT_OPENSSL_H 1
+
+
+/*
+MD5 calcul return
+*/
+
+struct Md5CtxExt_OpenSSL
+{
+  unsigned char *hash; /** Data's hash calculated */
+  int ext_error; /** Non-zero if external error occurs during init or hashing */
+};
+
+
+/**
+ * Indicates that MHD_MD5() function is present.
+ */
+#define MHD_MD5 1
+
+
+/**
+ * Calculate MD5 hash of the data.
+ *
+ * @param c the informations about the hash return
+ * @param d the data to hash
+ * @param n the length of the data
+ */
+void
+MHD_MD5 (struct Md5CtxExt_OpenSSL *c,
+         const unsigned char *d,
+         size_t n)
\ No newline at end of file