// -*- 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