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+/*
+ * libEtPan! -- a mail stuff library
+ *
+ * Copyright (C) 2001, 2002 - DINH Viet Hoa
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the libEtPan! project nor the names of its
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/* hmac-md5.h -- HMAC_MD5 functions
+ */
+
+/*
+ * $Id$
+ */
+
+#ifndef HMAC_MD5_H
+#define HMAC_MD5_H 1
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define HMAC_MD5_SIZE 16
+
+/* intermediate MD5 context */
+typedef struct HMAC_MD5_CTX_s {
+    MD5_CTX ictx, octx;
+} HMAC_MD5_CTX;
+
+/* intermediate HMAC state
+ *  values stored in network byte order (Big Endian)
+ */
+typedef struct HMAC_MD5_STATE_s {
+    UINT4 istate[4];
+    UINT4 ostate[4];
+} HMAC_MD5_STATE;
+
+/* One step hmac computation
+ *
+ * digest may be same as text or key
+ */
+void hmac_md5(const unsigned char *text, int text_len,
+              const unsigned char *key, int key_len,
+              unsigned char digest[HMAC_MD5_SIZE]);
+
+/* create context from key
+ */
+void hmac_md5_init(HMAC_MD5_CTX *hmac,
+                   const unsigned char *key, int key_len);
+
+/* precalculate intermediate state from key
+ */
+void hmac_md5_precalc(HMAC_MD5_STATE *hmac,
+                      const unsigned char *key, int key_len);
+
+/* initialize context from intermediate state
+ */
+void hmac_md5_import(HMAC_MD5_CTX *hmac, HMAC_MD5_STATE *state);
+
+#define hmac_md5_update(hmac, text, text_len) MD5Update(&(hmac)->ictx, (text), (text_len))
+
+/* finish hmac from intermediate result.  Intermediate result is zeroed.
+ */
+void hmac_md5_final(unsigned char digest[HMAC_MD5_SIZE],
+                    HMAC_MD5_CTX *hmac);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* HMAC_MD5_H */