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
  55 bool HashString::VerifyFile(string filename) const
  56 {
  57    FileFd fd;
  58    MD5Summation MD5;
  59    SHA1Summation SHA1;
  60    SHA256Summation SHA256;
  61    string fileHash;
  62
  63    FileFd Fd(filename, FileFd::ReadOnly);
  64    if(Type == "MD5Sum")
  65    {
  66       MD5.AddFD(Fd.Fd(), Fd.Size());
  67       fileHash = (string)MD5.Result();
  68    }
  69    else if (Type == "SHA1")
  70    {
  71       SHA1.AddFD(Fd.Fd(), Fd.Size());
  72       fileHash = (string)SHA1.Result();
  73    }
  74    else if (Type == "SHA256")
  75    {
  76       SHA256.AddFD(Fd.Fd(), Fd.Size());
  77       fileHash = (string)SHA256.Result();
  78    }
  79    Fd.Close();
  80
  81    if(_config->FindB("Debug::Hashes",false) == true)
  82       std::clog << "HashString::VerifyFile: got: " << fileHash << " expected: " << toStr() << std::endl;
  83
  84    return (fileHash == Hash);
  85 }
  86
  87 const char** HashString::SupportedHashes()
  88 {
  89    return _SupportedHashes;
  90 }
  91
  92 bool HashString::empty() const
  93 {
  94    return (Type.empty() || Hash.empty());
  95 }
  96
  97
  98 string HashString::toStr() const
  99 {
 100    return Type+string(":")+Hash;
 101 }
 102
 103
 104 // Hashes::AddFD - Add the contents of the FD                           /*{{{*/
 105 // ---------------------------------------------------------------------
 106 /* */
 107 bool Hashes::AddFD(int Fd,unsigned long Size)
 108 {
 109    unsigned char Buf[64*64];
 110    int Res = 0;
 111    while (Size != 0)
 112    {
 113       Res = read(Fd,Buf,min(Size,(unsigned long)sizeof(Buf)));
 114       if (Res < 0 || (unsigned)Res != min(Size,(unsigned long)sizeof(Buf)))
 115          return false;
 116       Size -= Res;
 117       MD5.Add(Buf,Res);
 118       SHA1.Add(Buf,Res);
 119       SHA256.Add(Buf,Res);
 120    }
 121    return true;
 122 }
 123                                                                         /*}}}*/
 124