// -*- mode: cpp; mode: fold -*- // Description /*{{{*/ // $Id: hashes.cc,v 1.1 2001/03/06 07:15:29 jgg Exp $ /* ###################################################################### Hashes - Simple wrapper around the hash functions This is just used to make building the methods simpler, this is the only interface required.. ##################################################################### */ /*}}}*/ // Include Files /*{{{*/ #include <apt-pkg/hashes.h> #include <apt-pkg/fileutl.h> #include <apt-pkg/configuration.h> #include <unistd.h> #include <system.h> #include <string> #include <iostream> /*}}}*/ const char* HashString::_SupportedHashes[] = { "SHA256", "SHA1", "MD5Sum", NULL }; HashString::HashString() { } HashString::HashString(string Type, string Hash) : Type(Type), Hash(Hash) { } HashString::HashString(string StringedHash) /*{{{*/ { // legacy: md5sum without "MD5Sum:" prefix if (StringedHash.find(":") == string::npos && StringedHash.size() == 32) { Type = "MD5Sum"; Hash = StringedHash; return; } string::size_type pos = StringedHash.find(":"); Type = StringedHash.substr(0,pos); Hash = StringedHash.substr(pos+1, StringedHash.size() - pos); if(_config->FindB("Debug::Hashes",false) == true) std::clog << "HashString(string): " << Type << " : " << Hash << std::endl; } /*}}}*/ bool HashString::VerifyFile(string filename) const /*{{{*/ { FileFd fd; MD5Summation MD5; SHA1Summation SHA1; SHA256Summation SHA256; string fileHash; FileFd Fd(filename, FileFd::ReadOnly); if(Type == "MD5Sum") { MD5.AddFD(Fd.Fd(), Fd.Size()); fileHash = (string)MD5.Result(); } else if (Type == "SHA1") { SHA1.AddFD(Fd.Fd(), Fd.Size()); fileHash = (string)SHA1.Result(); } else if (Type == "SHA256") { SHA256.AddFD(Fd.Fd(), Fd.Size()); fileHash = (string)SHA256.Result(); } Fd.Close(); if(_config->FindB("Debug::Hashes",false) == true) std::clog << "HashString::VerifyFile: got: " << fileHash << " expected: " << toStr() << std::endl; return (fileHash == Hash); } /*}}}*/ const char** HashString::SupportedHashes() { return _SupportedHashes; } bool HashString::empty() const { return (Type.empty() || Hash.empty()); } string HashString::toStr() const { return Type+string(":")+Hash; } // Hashes::AddFD - Add the contents of the FD /*{{{*/ // --------------------------------------------------------------------- /* */ bool Hashes::AddFD(int Fd,unsigned long Size) { unsigned char Buf[64*64]; int Res = 0; int ToEOF = (Size == 0); while (Size != 0 || ToEOF) { unsigned n = sizeof(Buf); if (!ToEOF) n = min(Size,(unsigned long)n); Res = read(Fd,Buf,n); if (Res < 0 || (!ToEOF && (unsigned) Res != n)) // error, or short read return false; if (ToEOF && Res == 0) // EOF break; Size -= Res; MD5.Add(Buf,Res); SHA1.Add(Buf,Res); SHA256.Add(Buf,Res); } return true; } /*}}}*/