[apt.git] / apt-pkg / contrib / hashes.cc

// -*- 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 <stdlib.h>
#include <string>
#include <iostream>
									/*}}}*/

const char * HashString::_SupportedHashes[] =
{
   "SHA512", "SHA256", "SHA1", "MD5Sum", "Checksum-FileSize", 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();
   }
   else if (strcasecmp(Type.c_str(), "Checksum-FileSize") == 0)
      strprintf(fileHash, "%llu", Fd.FileSize());
   Fd.Close();

   return fileHash;
}
									/*}}}*/
const char** HashString::SupportedHashes()				/*{{{*/
{
   return _SupportedHashes;
}
									/*}}}*/
APT_PURE bool HashString::empty() const					/*{{{*/
{
   return (Type.empty() || Hash.empty());
}
									/*}}}*/

APT_PURE static bool IsConfigured(const char *name, const char *what)
{
   std::string option;
   strprintf(option, "APT::Hashes::%s::%s", name, what);
   return _config->FindB(option, false);
}

APT_PURE bool HashString::usable() const				/*{{{*/
{
   return (
      (Type != "Checksum-FileSize") &&
      (Type != "MD5Sum") &&
      (Type != "SHA1") &&
      !IsConfigured(Type.c_str(), "Untrusted")
   );
}
									/*}}}*/
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);
}
									/*}}}*/

bool HashStringList::usable() const					/*{{{*/
{
   if (empty() == true)
      return false;
   std::string const forcedType = _config->Find("Acquire::ForceHash", "");
   if (forcedType.empty() == true)
   {
      // See if there is at least one usable hash
      for (auto const &hs: list)
         if (hs.usable())
            return true;
      return false;
   }
   return find(forcedType) != NULL;
}
									/*}}}*/
HashString const * HashStringList::find(char const * const type) const /*{{{*/
{
   if (type == NULL || type[0] == '\0')
   {
      std::string const 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;
}
									/*}}}*/
unsigned long long HashStringList::FileSize() const			/*{{{*/
{
   HashString const * const hsf = find("Checksum-FileSize");
   if (hsf == NULL)
      return 0;
   std::string const hv = hsf->HashValue();
   return strtoull(hv.c_str(), NULL, 10);
}
									/*}}}*/
bool HashStringList::FileSize(unsigned long long const Size)		/*{{{*/
{
   std::string size;
   strprintf(size, "%llu", Size);
   return push_back(HashString("Checksum-FileSize", size));
}
									/*}}}*/
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 (usable() == false)
      return false;

   Hashes hashes(*this);
   FileFd file(filename, FileFd::ReadOnly);
   HashString const * const hsf = find("Checksum-FileSize");
   if (hsf != NULL)
   {
      std::string fileSize;
      strprintf(fileSize, "%llu", file.FileSize());
      if (hsf->HashValue() != fileSize)
	 return false;
   }
   hashes.AddFD(file);
   HashStringList const hsl = hashes.GetHashStringList();
   return hsl == *this;
}
									/*}}}*/
bool HashStringList::operator==(HashStringList const &other) const	/*{{{*/
{
   std::string const forcedType = _config->Find("Acquire::ForceHash", "");
   if (forcedType.empty() == false)
   {
      HashString const * const hs = find(forcedType);
      HashString const * const ohs = other.find(forcedType);
      if (hs == NULL || ohs == NULL)
	 return false;
      return *hs == *ohs;
   }
   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);
}
									/*}}}*/

// PrivateHashes							/*{{{*/
class PrivateHashes {
public:
   unsigned long long FileSize;
   unsigned int CalcHashes;

   explicit PrivateHashes(unsigned int const CalcHashes) : FileSize(0), CalcHashes(CalcHashes) {}
   explicit PrivateHashes(HashStringList const &Hashes) : FileSize(0) {
      unsigned int calcHashes = Hashes.usable() ? 0 : ~0;
      if (Hashes.find("MD5Sum") != NULL)
	 calcHashes |= Hashes::MD5SUM;
      if (Hashes.find("SHA1") != NULL)
	 calcHashes |= Hashes::SHA1SUM;
      if (Hashes.find("SHA256") != NULL)
	 calcHashes |= Hashes::SHA256SUM;
      if (Hashes.find("SHA512") != NULL)
	 calcHashes |= Hashes::SHA512SUM;
      CalcHashes = calcHashes;
   }
};
									/*}}}*/
// Hashes::Add* - Add the contents of data or FD			/*{{{*/
bool Hashes::Add(const unsigned char * const Data, unsigned long long const Size)
{
   if (Size == 0)
      return true;
   bool Res = true;
APT_IGNORE_DEPRECATED_PUSH
   if ((d->CalcHashes & MD5SUM) == MD5SUM)
      Res &= MD5.Add(Data, Size);
   if ((d->CalcHashes & SHA1SUM) == SHA1SUM)
      Res &= SHA1.Add(Data, Size);
   if ((d->CalcHashes & SHA256SUM) == SHA256SUM)
      Res &= SHA256.Add(Data, Size);
   if ((d->CalcHashes & SHA512SUM) == SHA512SUM)
      Res &= SHA512.Add(Data, Size);
APT_IGNORE_DEPRECATED_POP
   d->FileSize += Size;
   return Res;
}
bool Hashes::Add(const unsigned char * const Data, unsigned long long const Size, unsigned int const Hashes)
{
   d->CalcHashes = Hashes;
   return Add(Data, Size);
}
bool Hashes::AddFD(int const Fd,unsigned long long Size)
{
   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 (Add(Buf, Res) == false)
	 return false;
   }
   return true;
}
bool Hashes::AddFD(int const Fd,unsigned long long Size, unsigned int const Hashes)
{
   d->CalcHashes = Hashes;
   return AddFD(Fd, Size);
}
bool Hashes::AddFD(FileFd &Fd,unsigned long long Size)
{
   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 (Add(Buf, a) == false)
	 return false;
   }
   return true;
}
bool Hashes::AddFD(FileFd &Fd,unsigned long long Size, unsigned int const Hashes)
{
   d->CalcHashes = Hashes;
   return AddFD(Fd, Size);
}
									/*}}}*/
HashStringList Hashes::GetHashStringList()
{
   HashStringList hashes;
APT_IGNORE_DEPRECATED_PUSH
   if ((d->CalcHashes & MD5SUM) == MD5SUM)
      hashes.push_back(HashString("MD5Sum", MD5.Result().Value()));
   if ((d->CalcHashes & SHA1SUM) == SHA1SUM)
      hashes.push_back(HashString("SHA1", SHA1.Result().Value()));
   if ((d->CalcHashes & SHA256SUM) == SHA256SUM)
      hashes.push_back(HashString("SHA256", SHA256.Result().Value()));
   if ((d->CalcHashes & SHA512SUM) == SHA512SUM)
      hashes.push_back(HashString("SHA512", SHA512.Result().Value()));
APT_IGNORE_DEPRECATED_POP
   hashes.FileSize(d->FileSize);
   return hashes;
}
APT_IGNORE_DEPRECATED_PUSH
Hashes::Hashes() : d(new PrivateHashes(~0)) { }
Hashes::Hashes(unsigned int const Hashes) : d(new PrivateHashes(Hashes)) {}
Hashes::Hashes(HashStringList const &Hashes) : d(new PrivateHashes(Hashes)) {}
Hashes::~Hashes() { delete d; }
APT_IGNORE_DEPRECATED_POP
Commit	Line	Data
63b1700f AL	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 /{{{/
ea542140 DK	14	#include <config.h>
ea542140 DK	15
63b1700f	16	#include <apt-pkg/hashes.h>
495e5cb2 MV	17	#include <apt-pkg/fileutl.h>
495e5cb2 MV	18	#include <apt-pkg/configuration.h>
453b82a3 DK	19	#include <apt-pkg/md5.h>
	20	#include <apt-pkg/sha1.h>
	21	#include <apt-pkg/sha2.h>
aea7f4c8	22
453b82a3 DK	23	#include <stddef.h>
453b82a3 DK	24	#include <algorithm>
ea542140	25	#include <unistd.h>
448c38bd	26	#include <stdlib.h>
495e5cb2 MV	27	#include <string>
495e5cb2 MV	28	#include <iostream>
63b1700f AL	29	/}}}/
63b1700f AL	30
f4c3850e	31	const char * HashString::_SupportedHashes[] =
495e5cb2	32	{
23397c9d	33	"SHA512", "SHA256", "SHA1", "MD5Sum", "Checksum-FileSize", NULL
495e5cb2 MV	34	};
	35
	36	HashString::HashString()
	37	{
	38	}
	39
8f3ba4e8	40	HashString::HashString(std::string Type, std::string Hash) : Type(Type), Hash(Hash)
495e5cb2 MV	41	{
	42	}
	43
8f3ba4e8	44	HashString::HashString(std::string StringedHash) /{{{/
495e5cb2	45	{
f4c3850e	46	if (StringedHash.find(":") == std::string::npos)
495e5cb2	47	{
f4c3850e DK	48	// legacy: md5sum without "MD5Sum:" prefix
	49	if (StringedHash.size() == 32)
	50	{
	51	Type = "MD5Sum";
	52	Hash = StringedHash;
	53	}
	54	if(_config->FindB("Debug::Hashes",false) == true)
	55	std::clog << "HashString(string): invalid StringedHash " << StringedHash << std::endl;
495e5cb2 MV	56	return;
495e5cb2 MV	57	}
8f3ba4e8	58	std::string::size_type pos = StringedHash.find(":");
8a8feb29	59	Type = StringedHash.substr(0,pos);
495e5cb2 MV	60	Hash = StringedHash.substr(pos+1, StringedHash.size() - pos);
	61
	62	if(_config->FindB("Debug::Hashes",false) == true)
	63	std::clog << "HashString(string): " << Type << " : " << Hash << std::endl;
	64	}
92fcbfc1	65	/}}}/
8f3ba4e8	66	bool HashString::VerifyFile(std::string filename) const /{{{/
e6645b9f MV	67	{
	68	std::string fileHash = GetHashForFile(filename);
	69
	70	if(_config->FindB("Debug::Hashes",false) == true)
	71	std::clog << "HashString::VerifyFile: got: " << fileHash << " expected: " << toStr() << std::endl;
	72
	73	return (fileHash == Hash);
	74	}
	75	/}}}/
	76	bool HashString::FromFile(std::string filename) /{{{/
	77	{
	78	// pick the strongest hash
	79	if (Type == "")
	80	Type = _SupportedHashes[0];
	81
	82	Hash = GetHashForFile(filename);
	83	return true;
	84	}
	85	/}}}/
	86	std::string HashString::GetHashForFile(std::string filename) const /{{{/
495e5cb2	87	{
8f3ba4e8	88	std::string fileHash;
495e5cb2 MV	89
495e5cb2 MV	90	FileFd Fd(filename, FileFd::ReadOnly);
f4c3850e	91	if(strcasecmp(Type.c_str(), "MD5Sum") == 0)
495e5cb2	92	{
2dcf7b8f	93	MD5Summation MD5;
109eb151	94	MD5.AddFD(Fd);
8f3ba4e8	95	fileHash = (std::string)MD5.Result();
2dcf7b8f	96	}
f4c3850e	97	else if (strcasecmp(Type.c_str(), "SHA1") == 0)
495e5cb2	98	{
2dcf7b8f	99	SHA1Summation SHA1;
109eb151	100	SHA1.AddFD(Fd);
8f3ba4e8	101	fileHash = (std::string)SHA1.Result();
2dcf7b8f	102	}
f4c3850e	103	else if (strcasecmp(Type.c_str(), "SHA256") == 0)
495e5cb2	104	{
2dcf7b8f	105	SHA256Summation SHA256;
109eb151	106	SHA256.AddFD(Fd);
8f3ba4e8	107	fileHash = (std::string)SHA256.Result();
495e5cb2	108	}
f4c3850e	109	else if (strcasecmp(Type.c_str(), "SHA512") == 0)
d9b9e9e2	110	{
2dcf7b8f	111	SHA512Summation SHA512;
109eb151	112	SHA512.AddFD(Fd);
8f3ba4e8	113	fileHash = (std::string)SHA512.Result();
d9b9e9e2	114	}
23397c9d DK	115	else if (strcasecmp(Type.c_str(), "Checksum-FileSize") == 0)
23397c9d DK	116	strprintf(fileHash, "%llu", Fd.FileSize());
495e5cb2 MV	117	Fd.Close();
495e5cb2 MV	118
e6645b9f	119	return fileHash;
495e5cb2	120	}
92fcbfc1	121	/}}}/
f4c3850e	122	const char** HashString::SupportedHashes() /{{{/
495e5cb2 MV	123	{
	124	return _SupportedHashes;
	125	}
f4c3850e DK	126	/}}}/
f4c3850e DK	127	APT_PURE bool HashString::empty() const /{{{/
495e5cb2 MV	128	{
	129	return (Type.empty() \|\| Hash.empty());
	130	}
f4c3850e	131	/}}}/
6a4958d3 JAK	132
	133	APT_PURE static bool IsConfigured(const char name, const char what)
	134	{
	135	std::string option;
	136	strprintf(option, "APT::Hashes::%s::%s", name, what);
	137	return _config->FindB(option, false);
	138	}
	139
55ae7a51 MV	140	APT_PURE bool HashString::usable() const /{{{/
	141	{
	142	return (
	143	(Type != "Checksum-FileSize") &&
51c04562	144	(Type != "MD5Sum") &&
6a4958d3 JAK	145	(Type != "SHA1") &&
6a4958d3 JAK	146	!IsConfigured(Type.c_str(), "Untrusted")
55ae7a51 MV	147	);
55ae7a51 MV	148	}
63d60998	149	/}}}/
f4c3850e DK	150	std::string HashString::toStr() const /{{{/
	151	{
	152	return Type + ":" + Hash;
	153	}
	154	/}}}/
	155	APT_PURE bool HashString::operator==(HashString const &other) const /{{{/
	156	{
	157	return (strcasecmp(Type.c_str(), other.Type.c_str()) == 0 && Hash == other.Hash);
	158	}
	159	APT_PURE bool HashString::operator!=(HashString const &other) const
	160	{
	161	return !(*this == other);
	162	}
	163	/}}}/
	164
b3501edb DK	165	bool HashStringList::usable() const /{{{/
	166	{
	167	if (empty() == true)
	168	return false;
	169	std::string const forcedType = _config->Find("Acquire::ForceHash", "");
	170	if (forcedType.empty() == true)
23397c9d	171	{
55ae7a51 MV	172	// See if there is at least one usable hash
	173	for (auto const &hs: list)
	174	if (hs.usable())
	175	return true;
23397c9d DK	176	return false;
23397c9d DK	177	}
b3501edb DK	178	return find(forcedType) != NULL;
	179	}
	180	/}}}/
f4c3850e DK	181	HashString const * HashStringList::find(char const * const type) const /{{{/
	182	{
	183	if (type == NULL \|\| type[0] == '\0')
	184	{
b3501edb	185	std::string const forcedType = _config->Find("Acquire::ForceHash", "");
f4c3850e DK	186	if (forcedType.empty() == false)
	187	return find(forcedType.c_str());
	188	for (char const * const * t = HashString::SupportedHashes(); *t != NULL; ++t)
	189	for (std::vector<HashString>::const_iterator hs = list.begin(); hs != list.end(); ++hs)
	190	if (strcasecmp(hs->HashType().c_str(), *t) == 0)
	191	return &*hs;
	192	return NULL;
	193	}
	194	for (std::vector<HashString>::const_iterator hs = list.begin(); hs != list.end(); ++hs)
	195	if (strcasecmp(hs->HashType().c_str(), type) == 0)
	196	return &*hs;
	197	return NULL;
	198	}
	199	/}}}/
448c38bd DK	200	unsigned long long HashStringList::FileSize() const /{{{/
	201	{
	202	HashString const * const hsf = find("Checksum-FileSize");
	203	if (hsf == NULL)
	204	return 0;
	205	std::string const hv = hsf->HashValue();
	206	return strtoull(hv.c_str(), NULL, 10);
	207	}
	208	/}}}/
4f51fd86 DK	209	bool HashStringList::FileSize(unsigned long long const Size) /{{{/
	210	{
	211	std::string size;
	212	strprintf(size, "%llu", Size);
	213	return push_back(HashString("Checksum-FileSize", size));
	214	}
	215	/}}}/
f4c3850e DK	216	bool HashStringList::supported(char const * const type) /{{{/
	217	{
	218	for (char const * const * t = HashString::SupportedHashes(); *t != NULL; ++t)
	219	if (strcasecmp(*t, type) == 0)
	220	return true;
	221	return false;
	222	}
	223	/}}}/
	224	bool HashStringList::push_back(const HashString &hashString) /{{{/
	225	{
	226	if (hashString.HashType().empty() == true \|\|
	227	hashString.HashValue().empty() == true \|\|
	228	supported(hashString.HashType().c_str()) == false)
	229	return false;
495e5cb2	230
f4c3850e DK	231	// ensure that each type is added only once
	232	HashString const * const hs = find(hashString.HashType().c_str());
	233	if (hs != NULL)
	234	return *hs == hashString;
	235
	236	list.push_back(hashString);
	237	return true;
	238	}
	239	/}}}/
	240	bool HashStringList::VerifyFile(std::string filename) const /{{{/
	241	{
495b7a61	242	if (usable() == false)
f4c3850e	243	return false;
495b7a61 DK	244
	245	Hashes hashes(*this);
	246	FileFd file(filename, FileFd::ReadOnly);
23397c9d	247	HashString const * const hsf = find("Checksum-FileSize");
495b7a61 DK	248	if (hsf != NULL)
	249	{
	250	std::string fileSize;
	251	strprintf(fileSize, "%llu", file.FileSize());
	252	if (hsf->HashValue() != fileSize)
	253	return false;
	254	}
	255	hashes.AddFD(file);
	256	HashStringList const hsl = hashes.GetHashStringList();
	257	return hsl == *this;
f4c3850e DK	258	}
	259	/}}}/
	260	bool HashStringList::operator==(HashStringList const &other) const /{{{/
495e5cb2	261	{
b3501edb DK	262	std::string const forcedType = _config->Find("Acquire::ForceHash", "");
	263	if (forcedType.empty() == false)
	264	{
f6d4ab9a	265	HashString const * const hs = find(forcedType);
b3501edb DK	266	HashString const * const ohs = other.find(forcedType);
	267	if (hs == NULL \|\| ohs == NULL)
	268	return false;
f6d4ab9a	269	return hs == ohs;
b3501edb	270	}
f4c3850e DK	271	short matches = 0;
	272	for (const_iterator hs = begin(); hs != end(); ++hs)
	273	{
	274	HashString const * const ohs = other.find(hs->HashType());
	275	if (ohs == NULL)
	276	continue;
	277	if (hs != ohs)
	278	return false;
	279	++matches;
	280	}
	281	if (matches == 0)
	282	return false;
	283	return true;
	284	}
	285	bool HashStringList::operator!=(HashStringList const &other) const
	286	{
	287	return !(*this == other);
495e5cb2	288	}
f4c3850e	289	/}}}/
495e5cb2	290
23397c9d DK	291	// PrivateHashes /{{{/
	292	class PrivateHashes {
	293	public:
	294	unsigned long long FileSize;
9224ce3d	295	unsigned int CalcHashes;
23397c9d	296
e8afd168	297	explicit PrivateHashes(unsigned int const CalcHashes) : FileSize(0), CalcHashes(CalcHashes) {}
6c55f07a DK	298	explicit PrivateHashes(HashStringList const &Hashes) : FileSize(0) {
	299	unsigned int calcHashes = Hashes.usable() ? 0 : ~0;
	300	if (Hashes.find("MD5Sum") != NULL)
	301	calcHashes \|= Hashes::MD5SUM;
	302	if (Hashes.find("SHA1") != NULL)
	303	calcHashes \|= Hashes::SHA1SUM;
	304	if (Hashes.find("SHA256") != NULL)
	305	calcHashes \|= Hashes::SHA256SUM;
	306	if (Hashes.find("SHA512") != NULL)
	307	calcHashes \|= Hashes::SHA512SUM;
	308	CalcHashes = calcHashes;
	309	}
23397c9d DK	310	};
23397c9d DK	311	/}}}/
b3501edb	312	// Hashes::Add* - Add the contents of data or FD /{{{/
9224ce3d	313	bool Hashes::Add(const unsigned char * const Data, unsigned long long const Size)
b3501edb	314	{
644478e8 DK	315	if (Size == 0)
644478e8 DK	316	return true;
b3501edb	317	bool Res = true;
586d8704	318	APT_IGNORE_DEPRECATED_PUSH
9224ce3d	319	if ((d->CalcHashes & MD5SUM) == MD5SUM)
b3501edb	320	Res &= MD5.Add(Data, Size);
9224ce3d	321	if ((d->CalcHashes & SHA1SUM) == SHA1SUM)
b3501edb	322	Res &= SHA1.Add(Data, Size);
9224ce3d	323	if ((d->CalcHashes & SHA256SUM) == SHA256SUM)
b3501edb	324	Res &= SHA256.Add(Data, Size);
9224ce3d	325	if ((d->CalcHashes & SHA512SUM) == SHA512SUM)
b3501edb	326	Res &= SHA512.Add(Data, Size);
586d8704	327	APT_IGNORE_DEPRECATED_POP
23397c9d	328	d->FileSize += Size;
b3501edb DK	329	return Res;
b3501edb DK	330	}
9224ce3d DK	331	bool Hashes::Add(const unsigned char * const Data, unsigned long long const Size, unsigned int const Hashes)
	332	{
	333	d->CalcHashes = Hashes;
	334	return Add(Data, Size);
	335	}
	336	bool Hashes::AddFD(int const Fd,unsigned long long Size)
63b1700f AL	337	{
63b1700f AL	338	unsigned char Buf[64*64];
ce928105	339	bool const ToEOF = (Size == UntilEOF);
04f4e1a3	340	while (Size != 0 \|\| ToEOF)
63b1700f	341	{
650faab0	342	unsigned long long n = sizeof(Buf);
8f3ba4e8	343	if (!ToEOF) n = std::min(Size, n);
9ce3cfc9	344	ssize_t const Res = read(Fd,Buf,n);
650faab0	345	if (Res < 0 \|\| (!ToEOF && Res != (ssize_t) n)) // error, or short read
1dab797c	346	return false;
04f4e1a3	347	if (ToEOF && Res == 0) // EOF
1dab797c	348	break;
63b1700f	349	Size -= Res;
9224ce3d	350	if (Add(Buf, Res) == false)
b3501edb	351	return false;
63b1700f AL	352	}
63b1700f AL	353	return true;
109eb151	354	}
9224ce3d DK	355	bool Hashes::AddFD(int const Fd,unsigned long long Size, unsigned int const Hashes)
	356	{
	357	d->CalcHashes = Hashes;
	358	return AddFD(Fd, Size);
	359	}
	360	bool Hashes::AddFD(FileFd &Fd,unsigned long long Size)
109eb151 DK	361	{
	362	unsigned char Buf[64*64];
	363	bool const ToEOF = (Size == 0);
	364	while (Size != 0 \|\| ToEOF)
	365	{
	366	unsigned long long n = sizeof(Buf);
	367	if (!ToEOF) n = std::min(Size, n);
	368	unsigned long long a = 0;
	369	if (Fd.Read(Buf, n, &a) == false) // error
	370	return false;
	371	if (ToEOF == false)
	372	{
	373	if (a != n) // short read
	374	return false;
	375	}
	376	else if (a == 0) // EOF
	377	break;
	378	Size -= a;
9224ce3d	379	if (Add(Buf, a) == false)
b3501edb	380	return false;
109eb151 DK	381	}
109eb151 DK	382	return true;
9224ce3d DK	383	}
	384	bool Hashes::AddFD(FileFd &Fd,unsigned long long Size, unsigned int const Hashes)
	385	{
	386	d->CalcHashes = Hashes;
	387	return AddFD(Fd, Size);
63b1700f AL	388	}
63b1700f AL	389	/}}}/
b3501edb DK	390	HashStringList Hashes::GetHashStringList()
	391	{
	392	HashStringList hashes;
586d8704	393	APT_IGNORE_DEPRECATED_PUSH
9224ce3d DK	394	if ((d->CalcHashes & MD5SUM) == MD5SUM)
	395	hashes.push_back(HashString("MD5Sum", MD5.Result().Value()));
	396	if ((d->CalcHashes & SHA1SUM) == SHA1SUM)
	397	hashes.push_back(HashString("SHA1", SHA1.Result().Value()));
	398	if ((d->CalcHashes & SHA256SUM) == SHA256SUM)
	399	hashes.push_back(HashString("SHA256", SHA256.Result().Value()));
	400	if ((d->CalcHashes & SHA512SUM) == SHA512SUM)
	401	hashes.push_back(HashString("SHA512", SHA512.Result().Value()));
586d8704	402	APT_IGNORE_DEPRECATED_POP
4f51fd86	403	hashes.FileSize(d->FileSize);
b3501edb DK	404	return hashes;
b3501edb DK	405	}
586d8704	406	APT_IGNORE_DEPRECATED_PUSH
6c55f07a DK	407	Hashes::Hashes() : d(new PrivateHashes(~0)) { }
	408	Hashes::Hashes(unsigned int const Hashes) : d(new PrivateHashes(Hashes)) {}
	409	Hashes::Hashes(HashStringList const &Hashes) : d(new PrivateHashes(Hashes)) {}
23397c9d	410	Hashes::~Hashes() { delete d; }
586d8704	411	APT_IGNORE_DEPRECATED_POP