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 <config.h>
  15
  16 #include <apt-pkg/hashes.h>
  17 #include <apt-pkg/fileutl.h>
  18 #include <apt-pkg/configuration.h>
  19 #include <apt-pkg/macros.h>
  20
  21 #include <unistd.h>
  22 #include <string>
  23 #include <iostream>
  24                                                                         /*}}}*/
  25
  26 const char* HashString::_SupportedHashes[] =
  27 {
  28    "SHA512", "SHA256", "SHA1", "MD5Sum", NULL
  29 };
  30
  31 HashString::HashString()
  32 {
  33 }
  34
  35 HashString::HashString(std::string Type, std::string Hash) : Type(Type), Hash(Hash)
  36 {
  37 }
  38
  39 HashString::HashString(std::string StringedHash)                        /*{{{*/
  40 {
  41    // legacy: md5sum without "MD5Sum:" prefix
  42    if (StringedHash.find(":") == std::string::npos && StringedHash.size() == 32)
  43    {
  44       Type = "MD5Sum";
  45       Hash = StringedHash;
  46       return;
  47    }
  48    std::string::size_type pos = StringedHash.find(":");
  49    Type = StringedHash.substr(0,pos);
  50    Hash = StringedHash.substr(pos+1, StringedHash.size() - pos);
  51
  52    if(_config->FindB("Debug::Hashes",false) == true)
  53       std::clog << "HashString(string): " << Type << " : " << Hash << std::endl;
  54 }
  55                                                                         /*}}}*/
  56 bool HashString::VerifyFile(std::string filename) const                 /*{{{*/
  57 {
  58    std::string fileHash;
  59
  60    FileFd Fd(filename, FileFd::ReadOnly);
  61    if(Type == "MD5Sum")
  62    {
  63       MD5Summation MD5;
  64       MD5.AddFD(Fd);
  65       fileHash = (std::string)MD5.Result();
  66    }
  67    else if (Type == "SHA1")
  68    {
  69       SHA1Summation SHA1;
  70       SHA1.AddFD(Fd);
  71       fileHash = (std::string)SHA1.Result();
  72    }
  73    else if (Type == "SHA256")
  74    {
  75       SHA256Summation SHA256;
  76       SHA256.AddFD(Fd);
  77       fileHash = (std::string)SHA256.Result();
  78    }
  79    else if (Type == "SHA512")
  80    {
  81       SHA512Summation SHA512;
  82       SHA512.AddFD(Fd);
  83       fileHash = (std::string)SHA512.Result();
  84    }
  85    Fd.Close();
  86
  87    if(_config->FindB("Debug::Hashes",false) == true)
  88       std::clog << "HashString::VerifyFile: got: " << fileHash << " expected: " << toStr() << std::endl;
  89
  90    return (fileHash == Hash);
  91 }
  92                                                                         /*}}}*/
  93 const char** HashString::SupportedHashes()
  94 {
  95    return _SupportedHashes;
  96 }
  97
  98 bool HashString::empty() const
  99 {
 100    return (Type.empty() || Hash.empty());
 101 }
 102
 103 std::string HashString::toStr() const
 104 {
 105    return Type + std::string(":") + Hash;
 106 }
 107
 108 // Hashes::AddFD - Add the contents of the FD                           /*{{{*/
 109 // ---------------------------------------------------------------------
 110 /* */
 111 bool Hashes::AddFD(int const Fd,unsigned long long Size, bool const addMD5,
 112                    bool const addSHA1, bool const addSHA256, bool const addSHA512)
 113 {
 114    unsigned char Buf[64*64];
 115    ssize_t Res = 0;
 116    int ToEOF = (Size == 0);
 117    while (Size != 0 || ToEOF)
 118    {
 119       unsigned long long n = sizeof(Buf);
 120       if (!ToEOF) n = std::min(Size, n);
 121       Res = read(Fd,Buf,n);
 122       if (Res < 0 || (!ToEOF && Res != (ssize_t) n)) // error, or short read
 123          return false;
 124       if (ToEOF && Res == 0) // EOF
 125          break;
 126       Size -= Res;
 127       if (addMD5 == true)
 128          MD5.Add(Buf,Res);
 129       if (addSHA1 == true)
 130          SHA1.Add(Buf,Res);
 131       if (addSHA256 == true)
 132          SHA256.Add(Buf,Res);
 133       if (addSHA512 == true)
 134          SHA512.Add(Buf,Res);
 135    }
 136    return true;
 137 }
 138 bool Hashes::AddFD(FileFd &Fd,unsigned long long Size, bool const addMD5,
 139                    bool const addSHA1, bool const addSHA256, bool const addSHA512)
 140 {
 141    unsigned char Buf[64*64];
 142    bool const ToEOF = (Size == 0);
 143    while (Size != 0 || ToEOF)
 144    {
 145       unsigned long long n = sizeof(Buf);
 146       if (!ToEOF) n = std::min(Size, n);
 147       unsigned long long a = 0;
 148       if (Fd.Read(Buf, n, &a) == false) // error
 149          return false;
 150       if (ToEOF == false)
 151       {
 152          if (a != n) // short read
 153             return false;
 154       }
 155       else if (a == 0) // EOF
 156          break;
 157       Size -= a;
 158       if (addMD5 == true)
 159          MD5.Add(Buf, a);
 160       if (addSHA1 == true)
 161          SHA1.Add(Buf, a);
 162       if (addSHA256 == true)
 163          SHA256.Add(Buf, a);
 164       if (addSHA512 == true)
 165          SHA512.Add(Buf, a);
 166    }
 167    return true;
 168 }
 169                                                                         /*}}}*/