apt-pkg/contrib/md5.h

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: md5.h,v 1.3 1999/01/18 06:20:08 jgg Exp $
   4 /* ######################################################################
   5
   6    MD5SumValue - Storage for a MD5Sum
   7    MD5Summation - MD5 Message Digest Algorithm.
   8
   9    This is a C++ interface to a set of MD5Sum functions. The class can
  10    store a MD5Sum in 16 bytes of memory.
  11
  12    A MD5Sum is used to generate a (hopefully) unique 16 byte number for a
  13    block of data. This can be used to gaurd against corruption of a file.
  14
  15    There are two classes because computing a MD5 is not a continual
  16    operation unless 64 byte blocks are used. Also the summation requires an
  17    extra 18*4 bytes to operate.
  18
  19    ##################################################################### */
  20                                                                         /*}}}*/
  21 #ifndef APTPKG_MD5_H
  22 #define APTPKG_MD5_H
  23
  24 #ifdef __GNUG__
  25 #pragma interface "apt-pkg/md5.h"
  26 #endif
  27
  28 #include <string>
  29
  30 class MD5Summation;
  31
  32 class MD5SumValue
  33 {
  34    friend MD5Summation;
  35    unsigned char Sum[4*4];
  36
  37    public:
  38
  39    // Accessors
  40    bool operator ==(const MD5SumValue &rhs) const;
  41    string Value() const;
  42    inline void Value(unsigned char S[16])
  43          {for (int I = 0; I != sizeof(Sum); I++) S[I] = Sum[I];};
  44    inline operator string() const {return Value();};
  45    bool Set(string Str);
  46    inline void Set(unsigned char S[16])
  47          {for (int I = 0; I != sizeof(Sum); I++) Sum[I] = S[I];};
  48
  49    MD5SumValue(string Str);
  50    MD5SumValue();
  51 };
  52
  53 class MD5Summation
  54 {
  55    unsigned char Buf[4*4];
  56    unsigned char Bytes[2*4];
  57    unsigned char In[16*4];
  58    bool Done;
  59
  60    public:
  61
  62    bool Add(const unsigned char *Data,unsigned long Size);
  63    inline bool Add(const char *Data) {return Add((unsigned char *)Data,strlen(Data));};
  64    bool AddFD(int Fd,unsigned long Size);
  65    inline bool Add(const unsigned char *Beg,const unsigned char *End)
  66                   {return Add(Beg,End-Beg);};
  67    MD5SumValue Result();
  68
  69    MD5Summation();
  70 };
  71
  72 #endif