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diff --git a/libcurl/src/lib/curl_hmac.h b/libcurl/src/lib/curl_hmac.h
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+#ifndef HEADER_CURL_HMAC_H
+#define HEADER_CURL_HMAC_H
+/***************************************************************************
+ * _ _ ____ _
+ * Project ___| | | | _ \| |
+ * / __| | | | |_) | |
+ * | (__| |_| | _ <| |___
+ * \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 1998 - 2010, Daniel Stenberg, <daniel@haxx.se>, et al.
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at http://curl.haxx.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ***************************************************************************/
+
+#ifndef CURL_DISABLE_CRYPTO_AUTH
+
+typedef void (* HMAC_hinit_func)(void * context);
+typedef void (* HMAC_hupdate_func)(void * context,
+ const unsigned char * data,
+ unsigned int len);
+typedef void (* HMAC_hfinal_func)(unsigned char * result, void * context);
+
+
+/* Per-hash function HMAC parameters. */
+
+typedef struct {
+ HMAC_hinit_func hmac_hinit; /* Initialize context procedure. */
+ HMAC_hupdate_func hmac_hupdate; /* Update context with data. */
+ HMAC_hfinal_func hmac_hfinal; /* Get final result procedure. */
+ unsigned int hmac_ctxtsize; /* Context structure size. */
+ unsigned int hmac_maxkeylen; /* Maximum key length (bytes). */
+ unsigned int hmac_resultlen; /* Result length (bytes). */
+} HMAC_params;
+
+
+/* HMAC computation context. */
+
+typedef struct {
+ const HMAC_params * hmac_hash; /* Hash function definition. */
+ void * hmac_hashctxt1; /* Hash function context 1. */
+ void * hmac_hashctxt2; /* Hash function context 2. */
+} HMAC_context;
+
+
+/* Prototypes. */
+
+CURL_STATIC HMAC_context * Curl_HMAC_init(const HMAC_params * hashparams,
+ const unsigned char * key,
+ unsigned int keylen);
+CURL_STATIC int Curl_HMAC_update(HMAC_context * context,
+ const unsigned char * data,
+ unsigned int len);
+CURL_STATIC int Curl_HMAC_final(HMAC_context * context, unsigned char * result);
+
+#endif
+
+#endif /* HEADER_CURL_HMAC_H */