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diff --git a/lib/isc/include/isc/md5.h b/lib/isc/include/isc/md5.h
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+/*
+ * Copyright (C) 2004-2007  Internet Systems Consortium, Inc. ("ISC")
+ * Copyright (C) 2000, 2001  Internet Software Consortium.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
+ * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
+ * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+ * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
+ * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+ * PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/* $Id: md5.h,v 1.16 2007/06/19 23:47:18 tbox Exp $ */
+
+/*! \file isc/md5.h
+ * \brief This is the header file for the MD5 message-digest algorithm.
+ *
+ * The algorithm is due to Ron Rivest.  This code was
+ * written by Colin Plumb in 1993, no copyright is claimed.
+ * This code is in the public domain; do with it what you wish.
+ *
+ * Equivalent code is available from RSA Data Security, Inc.
+ * This code has been tested against that, and is equivalent,
+ * except that you don't need to include two pages of legalese
+ * with every copy.
+ *
+ * To compute the message digest of a chunk of bytes, declare an
+ * MD5Context structure, pass it to MD5Init, call MD5Update as
+ * needed on buffers full of bytes, and then call MD5Final, which
+ * will fill a supplied 16-byte array with the digest.
+ *
+ * Changed so as no longer to depend on Colin Plumb's `usual.h'
+ * header definitions; now uses stuff from dpkg's config.h
+ *  - Ian Jackson <ijackson@nyx.cs.du.edu>.
+ * Still in the public domain.
+ */
+
+#ifndef ISC_MD5_H
+#define ISC_MD5_H 1
+
+#include <isc/lang.h>
+#include <isc/types.h>
+
+#define ISC_MD5_DIGESTLENGTH 16U
+
+typedef struct {
+	isc_uint32_t buf[4];
+	isc_uint32_t bytes[2];
+	isc_uint32_t in[16];
+} isc_md5_t;
+
+ISC_LANG_BEGINDECLS
+
+void
+isc_md5_init(isc_md5_t *ctx);
+
+void
+isc_md5_invalidate(isc_md5_t *ctx);
+
+void
+isc_md5_update(isc_md5_t *ctx, const unsigned char *buf, unsigned int len);
+
+void
+isc_md5_final(isc_md5_t *ctx, unsigned char *digest);
+
+ISC_LANG_ENDDECLS
+
+#endif /* ISC_MD5_H */