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diff --git a/apt-pkg/contrib/md5.h b/apt-pkg/contrib/md5.h
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+// -*- mode: cpp; mode: fold -*-
+// Description								/*{{{*/
+/* ######################################################################
+   
+   MD5SumValue - Storage for a MD5Sum
+   MD5Summation - MD5 Message Digest Algorithm.
+   
+   This is a C++ interface to a set of MD5Sum functions. The class can
+   store a MD5Sum in 16 bytes of memory.
+   
+   A MD5Sum is used to generate a (hopefully) unique 16 byte number for a
+   block of data. This can be used to guard against corruption of a file.
+   MD5 should not be used for tamper protection, use SHA or something more
+   secure.
+   
+   There are two classes because computing a MD5 is not a continual 
+   operation unless 64 byte blocks are used. Also the summation requires an
+   extra 18*4 bytes to operate.
+   
+   ##################################################################### */
+									/*}}}*/
+#ifndef APTPKG_MD5_H
+#define APTPKG_MD5_H
+
+#include <stdint.h>
+
+#include "hashsum_template.h"
+
+#ifndef APT_10_CLEANER_HEADERS
+#include <algorithm>
+#include <cstring>
+#include <string>
+#endif
+#ifndef APT_8_CLEANER_HEADERS
+using std::string;
+using std::min;
+#endif
+
+typedef HashSumValue<128> MD5SumValue;
+
+class MD5Summation : public SummationImplementation
+{
+   uint32_t Buf[4];
+   unsigned char Bytes[2*4];
+   unsigned char In[16*4];
+   bool Done;
+
+   public:
+
+   bool Add(const unsigned char *inbuf, unsigned long long inlen) APT_OVERRIDE APT_NONNULL(2);
+   using SummationImplementation::Add;
+
+   MD5SumValue Result();
+
+   MD5Summation();
+};
+
+#endif