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// -*- 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) /*{{{*/
{
if (StringedHash.find(":") == std::string::npos)
{
// legacy: md5sum without "MD5Sum:" prefix
if (StringedHash.size() == 32)
{
Type = "MD5Sum";
Hash = StringedHash;
}
if(_config->FindB("Debug::Hashes",false) == true)
std::clog << "HashString(string): invalid StringedHash " << StringedHash << std::endl;
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(strcasecmp(Type.c_str(), "MD5Sum") == 0)
{
MD5Summation MD5;
MD5.AddFD(Fd);
fileHash = (std::string)MD5.Result();
}
else if (strcasecmp(Type.c_str(), "SHA1") == 0)
{
SHA1Summation SHA1;
SHA1.AddFD(Fd);
fileHash = (std::string)SHA1.Result();
}
else if (strcasecmp(Type.c_str(), "SHA256") == 0)
{
SHA256Summation SHA256;
SHA256.AddFD(Fd);
fileHash = (std::string)SHA256.Result();
}
else if (strcasecmp(Type.c_str(), "SHA512") == 0)
{
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 + ":" + Hash;
}
/*}}}*/
APT_PURE bool HashString::operator==(HashString const &other) const /*{{{*/
{
return (strcasecmp(Type.c_str(), other.Type.c_str()) == 0 && Hash == other.Hash);
}
APT_PURE bool HashString::operator!=(HashString const &other) const
{
return !(*this == other);
}
/*}}}*/
HashString const * HashStringList::find(char const * const type) const /*{{{*/
{
if (type == NULL || type[0] == '\0')
{
std::string forcedType = _config->Find("Acquire::ForceHash", "");
if (forcedType.empty() == false)
return find(forcedType.c_str());
for (char const * const * t = HashString::SupportedHashes(); *t != NULL; ++t)
for (std::vector<HashString>::const_iterator hs = list.begin(); hs != list.end(); ++hs)
if (strcasecmp(hs->HashType().c_str(), *t) == 0)
return &*hs;
return NULL;
}
for (std::vector<HashString>::const_iterator hs = list.begin(); hs != list.end(); ++hs)
if (strcasecmp(hs->HashType().c_str(), type) == 0)
return &*hs;
return NULL;
}
/*}}}*/
bool HashStringList::supported(char const * const type) /*{{{*/
{
for (char const * const * t = HashString::SupportedHashes(); *t != NULL; ++t)
if (strcasecmp(*t, type) == 0)
return true;
return false;
}
/*}}}*/
bool HashStringList::push_back(const HashString &hashString) /*{{{*/
{
if (hashString.HashType().empty() == true ||
hashString.HashValue().empty() == true ||
supported(hashString.HashType().c_str()) == false)
return false;
// ensure that each type is added only once
HashString const * const hs = find(hashString.HashType().c_str());
if (hs != NULL)
return *hs == hashString;
list.push_back(hashString);
return true;
}
/*}}}*/
bool HashStringList::VerifyFile(std::string filename) const /*{{{*/
{
if (list.empty() == true)
return false;
HashString const * const hs = find(NULL);
if (hs == NULL || hs->VerifyFile(filename) == false)
return false;
return true;
}
/*}}}*/
bool HashStringList::operator==(HashStringList const &other) const /*{{{*/
{
short matches = 0;
for (const_iterator hs = begin(); hs != end(); ++hs)
{
HashString const * const ohs = other.find(hs->HashType());
if (ohs == NULL)
continue;
if (*hs != *ohs)
return false;
++matches;
}
if (matches == 0)
return false;
return true;
}
bool HashStringList::operator!=(HashStringList const &other) const
{
return !(*this == other);
}
/*}}}*/
// 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 == UntilEOF);
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;
}
/*}}}*/
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