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diff --git a/crammd5/md5.h b/crammd5/md5.h
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+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
+/*
+ * This code implements 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.
+ */
+
+/* parts of this file are :
+ * Written March 1993 by Branko Lankester
+ * Modified June 1993 by Colin Plumb for altered md5.c.
+ * Modified October 1995 by Erik Troan for RPM
+ */
+#ifndef MD5_UTILS_H
+#define MD5_UTILS_H
+
+#if SIZEOF_UNSIGNED_INT == 32 / 8
+typedef	unsigned int unsigned32_t;
+#elif SIZEOF_UNSIGNED_LONG == 32 / 8
+typedef	unsigned long unsigned32_t;
+#else
+#include <sys/types.h>
+typedef	uint32 unsigned32_t;
+#endif
+
+#include <sys/types.h>
+
+typedef struct {
+	unsigned32_t buf[4];
+	unsigned32_t bits[2];
+	unsigned char in[64];
+	int doByteReverse;
+} MD5Context ;
+
+/* raw routines */
+void md5_init (MD5Context *ctx);
+void md5_update (MD5Context *ctx, const void *buf, size_t len);
+void md5_final (MD5Context *ctx, unsigned char digest[16]);
+
+
+#endif	/* MD5_UTILS_H */