apt-pkg/contrib/hashes.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: hashes.cc,v 1.1 2001/03/06 07:15:29 jgg Exp $
   4 /* ######################################################################
   5
   6    Hashes - Simple wrapper around the hash functions
   7
   8    This is just used to make building the methods simpler, this is the
   9    only interface required..
  10
  11    ##################################################################### */
  12                                                                         /*}}}*/
  13 // Include Files                                                        /*{{{*/
  14 #include <apt-pkg/hashes.h>
  15 #include <apt-pkg/fileutl.h>
  16 #include <apt-pkg/configuration.h>
  17
  18 #include <unistd.h>
  19 #include <system.h>
  20 #include <string>
  21 #include <iostream>
  22                                                                         /*}}}*/
  23
  24 const char* HashString::_SupportedHashes[] =
  25 {
  26    "SHA256", "SHA1", "MD5Sum", NULL
  27 };
  28
  29 HashString::HashString()
  30 {
  31 }
  32
  33 HashString::HashString(string Type, string Hash) : Type(Type), Hash(Hash)
  34 {
  35 }
  36
  37 HashString::HashString(string StringedHash)                             /*{{{*/
  38 {
  39    // legacy: md5sum without "MD5Sum:" prefix
  40    if (StringedHash.find(":") == string::npos && StringedHash.size() == 32)
  41    {
  42       Type = "MD5Sum";
  43       Hash = StringedHash;
  44       return;
  45    }
  46    string::size_type pos = StringedHash.find(":");
  47    Type = StringedHash.substr(0,pos);
  48    Hash = StringedHash.substr(pos+1, StringedHash.size() - pos);
  49
  50    if(_config->FindB("Debug::Hashes",false) == true)
  51       std::clog << "HashString(string): " << Type << " : " << Hash << std::endl;
  52 }
  53                                                                         /*}}}*/
  54 bool HashString::VerifyFile(string filename) const                      /*{{{*/
  55 {
  56    FileFd fd;
  57    MD5Summation MD5;
  58    SHA1Summation SHA1;
  59    SHA256Summation SHA256;
  60    string fileHash;
  61
  62    FileFd Fd(filename, FileFd::ReadOnly);
  63    if(Type == "MD5Sum")
  64    {
  65       MD5.AddFD(Fd.Fd(), Fd.Size());
  66       fileHash = (string)MD5.Result();
  67    }
  68    else if (Type == "SHA1")
  69    {
  70       SHA1.AddFD(Fd.Fd(), Fd.Size());
  71       fileHash = (string)SHA1.Result();
  72    }
  73    else if (Type == "SHA256")
  74    {
  75       SHA256.AddFD(Fd.Fd(), Fd.Size());
  76       fileHash = (string)SHA256.Result();
  77    }
  78    Fd.Close();
  79
  80    if(_config->FindB("Debug::Hashes",false) == true)
  81       std::clog << "HashString::VerifyFile: got: " << fileHash << " expected: " << toStr() << std::endl;
  82
  83    return (fileHash == Hash);
  84 }
  85                                                                         /*}}}*/
  86 const char** HashString::SupportedHashes()
  87 {
  88    return _SupportedHashes;
  89 }
  90
  91 bool HashString::empty() const
  92 {
  93    return (Type.empty() || Hash.empty());
  94 }
  95
  96 string HashString::toStr() const
  97 {
  98    return Type+string(":")+Hash;
  99 }
 100
 101 // Hashes::AddFD - Add the contents of the FD                           /*{{{*/
 102 // ---------------------------------------------------------------------
 103 /* */
 104 bool Hashes::AddFD(int Fd,unsigned long Size)
 105 {
 106    unsigned char Buf[64*64];
 107    int Res = 0;
 108    int ToEOF = (Size == 0);
 109    while (Size != 0 || ToEOF)
 110    {
 111       unsigned n = sizeof(Buf);
 112       if (!ToEOF) n = min(Size,(unsigned long)n);
 113       Res = read(Fd,Buf,n);
 114       if (Res < 0 || (!ToEOF && (unsigned) Res != n)) // error, or short read
 115          return false;
 116       if (ToEOF && Res == 0) // EOF
 117          break;
 118       Size -= Res;
 119       MD5.Add(Buf,Res);
 120       SHA1.Add(Buf,Res);
 121       SHA256.Add(Buf,Res);
 122    }
 123    return true;
 124 }
 125                                                                         /*}}}*/
 126