// -*- 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 <config.h> #include <apt-pkg/hashes.h> #include <apt-pkg/fileutl.h> #include <apt-pkg/configuration.h> #include <apt-pkg/md5.h> #include <apt-pkg/sha1.h> #include <apt-pkg/sha2.h> #include <stddef.h> #include <algorithm> #include <unistd.h> #include <string> #include <iostream> /*}}}*/ const char* HashString::_SupportedHashes[] = { "SHA512", "SHA256", "SHA1", "MD5Sum", NULL }; HashString::HashString() { } HashString::HashString(std::string Type, std::string Hash) : Type(Type), Hash(Hash) { } HashString::HashString(std::string StringedHash) /*{{{*/ { // legacy: md5sum without "MD5Sum:" prefix if (StringedHash.find(":") == std::string::npos && StringedHash.size() == 32) { Type = "MD5Sum"; Hash = StringedHash; return; } std::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(std::string filename) const /*{{{*/ { std::string fileHash = GetHashForFile(filename); if(_config->FindB("Debug::Hashes",false) == true) std::clog << "HashString::VerifyFile: got: " << fileHash << " expected: " << toStr() << std::endl; return (fileHash == Hash); } /*}}}*/ bool HashString::FromFile(std::string filename) /*{{{*/ { // pick the strongest hash if (Type == "") Type = _SupportedHashes[0]; Hash = GetHashForFile(filename); return true; } /*}}}*/ std::string HashString::GetHashForFile(std::string filename) const /*{{{*/ { std::string fileHash; FileFd Fd(filename, FileFd::ReadOnly); if(Type == "MD5Sum") { MD5Summation MD5; MD5.AddFD(Fd); fileHash = (std::string)MD5.Result(); } else if (Type == "SHA1") { SHA1Summation SHA1; SHA1.AddFD(Fd); fileHash = (std::string)SHA1.Result(); } else if (Type == "SHA256") { SHA256Summation SHA256; SHA256.AddFD(Fd); fileHash = (std::string)SHA256.Result(); } else if (Type == "SHA512") { SHA512Summation SHA512; SHA512.AddFD(Fd); fileHash = (std::string)SHA512.Result(); } Fd.Close(); return fileHash; } /*}}}*/ const char** HashString::SupportedHashes() { return _SupportedHashes; } APT_PURE bool HashString::empty() const { return (Type.empty() || Hash.empty()); } std::string HashString::toStr() const { return Type + std::string(":") + Hash; } // Hashes::AddFD - Add the contents of the FD /*{{{*/ // --------------------------------------------------------------------- /* */ bool Hashes::AddFD(int const Fd,unsigned long long Size, bool const addMD5, bool const addSHA1, bool const addSHA256, bool const addSHA512) { unsigned char Buf[64*64]; bool const ToEOF = (Size == 0); while (Size != 0 || ToEOF) { unsigned long long n = sizeof(Buf); if (!ToEOF) n = std::min(Size, n); ssize_t const Res = read(Fd,Buf,n); if (Res < 0 || (!ToEOF && Res != (ssize_t) n)) // error, or short read return false; if (ToEOF && Res == 0) // EOF break; Size -= Res; if (addMD5 == true) MD5.Add(Buf,Res); if (addSHA1 == true) SHA1.Add(Buf,Res); if (addSHA256 == true) SHA256.Add(Buf,Res); if (addSHA512 == true) SHA512.Add(Buf,Res); } return true; } bool Hashes::AddFD(FileFd &Fd,unsigned long long Size, bool const addMD5, bool const addSHA1, bool const addSHA256, bool const addSHA512) { unsigned char Buf[64*64]; bool const ToEOF = (Size == 0); while (Size != 0 || ToEOF) { unsigned long long n = sizeof(Buf); if (!ToEOF) n = std::min(Size, n); unsigned long long a = 0; if (Fd.Read(Buf, n, &a) == false) // error return false; if (ToEOF == false) { if (a != n) // short read return false; } else if (a == 0) // EOF break; Size -= a; if (addMD5 == true) MD5.Add(Buf, a); if (addSHA1 == true) SHA1.Add(Buf, a); if (addSHA256 == true) SHA256.Add(Buf, a); if (addSHA512 == true) SHA512.Add(Buf, a); } return true; } /*}}}*/