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// -*- mode: cpp; mode: fold -*-
// Description /*{{{*/
// $Id: md5.h,v 1.6 2001/05/07 05:06:52 jgg Exp $
/* ######################################################################
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 gaurd 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
#ifdef __GNUG__
#pragma interface "apt-pkg/md5.h"
#endif
#include <string>
#include <algorithm>
using std::string;
using std::min;
class MD5Summation;
class MD5SumValue
{
friend class MD5Summation;
unsigned char Sum[4*4];
public:
// Accessors
bool operator ==(const MD5SumValue &rhs) const;
string Value() const;
inline void Value(unsigned char S[16])
{for (int I = 0; I != sizeof(Sum); I++) S[I] = Sum[I];};
inline operator string() const {return Value();};
bool Set(string Str);
inline void Set(unsigned char S[16])
{for (int I = 0; I != sizeof(Sum); I++) Sum[I] = S[I];};
MD5SumValue(string Str);
MD5SumValue();
};
class MD5Summation
{
unsigned char Buf[4*4];
unsigned char Bytes[2*4];
unsigned char In[16*4];
bool Done;
public:
bool Add(const unsigned char *Data,unsigned long Size);
inline bool Add(const char *Data) {return Add((unsigned char *)Data,strlen(Data));};
bool AddFD(int Fd,unsigned long Size);
inline bool Add(const unsigned char *Beg,const unsigned char *End)
{return Add(Beg,End-Beg);};
MD5SumValue Result();
MD5Summation();
};
#endif
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