[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 <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);
}
									/*}}}*/

bool HashStringList::usable() const					/*{{{*/
{
   if (empty() == true)
      return false;
   std::string const forcedType = _config->Find("Acquire::ForceHash", "");
   if (forcedType.empty() == true)
      return true;
   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;
}
									/*}}}*/
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	/*{{{*/
{
   std::string const forcedType = _config->Find("Acquire::ForceHash", "");
   if (forcedType.empty() == false)
   {
      HashString const * const hs = other.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);
}
									/*}}}*/

// Hashes::Add* - Add the contents of data or FD			/*{{{*/
bool Hashes::Add(const unsigned char * const Data,unsigned long long const Size, unsigned int const Hashes)
{
   bool Res = true;
#if __GNUC__ >= 4
	#pragma GCC diagnostic push
	#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
#endif
   if ((Hashes & MD5SUM) == MD5SUM)
      Res &= MD5.Add(Data, Size);
   if ((Hashes & SHA1SUM) == SHA1SUM)
      Res &= SHA1.Add(Data, Size);
   if ((Hashes & SHA256SUM) == SHA256SUM)
      Res &= SHA256.Add(Data, Size);
   if ((Hashes & SHA512SUM) == SHA512SUM)
      Res &= SHA512.Add(Data, Size);
#if __GNUC__ >= 4
	#pragma GCC diagnostic pop
#endif
   return Res;
}
bool Hashes::AddFD(int const Fd,unsigned long long Size, unsigned int const Hashes)
{
   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, Hashes) == false)
	 return false;
   }
   return true;
}
bool Hashes::AddFD(FileFd &Fd,unsigned long long Size, unsigned int const Hashes)
{
   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, Hashes) == false)
	 return false;
   }
   return true;
}
									/*}}}*/
HashStringList Hashes::GetHashStringList()
{
   HashStringList hashes;
#if __GNUC__ >= 4
	#pragma GCC diagnostic push
	#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
#endif
   hashes.push_back(HashString("MD5Sum", MD5.Result().Value()));
   hashes.push_back(HashString("SHA1", SHA1.Result().Value()));
   hashes.push_back(HashString("SHA256", SHA256.Result().Value()));
   hashes.push_back(HashString("SHA512", SHA512.Result().Value()));
#if __GNUC__ >= 4
	#pragma GCC diagnostic pop
#endif
   return hashes;
}
#if __GNUC__ >= 4
	#pragma GCC diagnostic push
	#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
	#pragma GCC diagnostic ignored "-Wsuggest-attribute=const"
#endif
Hashes::Hashes() {}
Hashes::~Hashes() {}
#if __GNUC__ >= 4
	#pragma GCC diagnostic pop
#endif
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>
495e5cb2 MV	26	#include <string>
495e5cb2 MV	27	#include <iostream>
63b1700f AL	28	/}}}/
63b1700f AL	29
f4c3850e	30	const char * HashString::_SupportedHashes[] =
495e5cb2	31	{
d9b9e9e2	32	"SHA512", "SHA256", "SHA1", "MD5Sum", NULL
495e5cb2 MV	33	};
	34
	35	HashString::HashString()
	36	{
	37	}
	38
8f3ba4e8	39	HashString::HashString(std::string Type, std::string Hash) : Type(Type), Hash(Hash)
495e5cb2 MV	40	{
	41	}
	42
8f3ba4e8	43	HashString::HashString(std::string StringedHash) /{{{/
495e5cb2	44	{
f4c3850e	45	if (StringedHash.find(":") == std::string::npos)
495e5cb2	46	{
f4c3850e DK	47	// legacy: md5sum without "MD5Sum:" prefix
	48	if (StringedHash.size() == 32)
	49	{
	50	Type = "MD5Sum";
	51	Hash = StringedHash;
	52	}
	53	if(_config->FindB("Debug::Hashes",false) == true)
	54	std::clog << "HashString(string): invalid StringedHash " << StringedHash << std::endl;
495e5cb2 MV	55	return;
495e5cb2 MV	56	}
8f3ba4e8	57	std::string::size_type pos = StringedHash.find(":");
8a8feb29	58	Type = StringedHash.substr(0,pos);
495e5cb2 MV	59	Hash = StringedHash.substr(pos+1, StringedHash.size() - pos);
	60
	61	if(_config->FindB("Debug::Hashes",false) == true)
	62	std::clog << "HashString(string): " << Type << " : " << Hash << std::endl;
	63	}
92fcbfc1	64	/}}}/
8f3ba4e8	65	bool HashString::VerifyFile(std::string filename) const /{{{/
e6645b9f MV	66	{
	67	std::string fileHash = GetHashForFile(filename);
	68
	69	if(_config->FindB("Debug::Hashes",false) == true)
	70	std::clog << "HashString::VerifyFile: got: " << fileHash << " expected: " << toStr() << std::endl;
	71
	72	return (fileHash == Hash);
	73	}
	74	/}}}/
	75	bool HashString::FromFile(std::string filename) /{{{/
	76	{
	77	// pick the strongest hash
	78	if (Type == "")
	79	Type = _SupportedHashes[0];
	80
	81	Hash = GetHashForFile(filename);
	82	return true;
	83	}
	84	/}}}/
	85	std::string HashString::GetHashForFile(std::string filename) const /{{{/
495e5cb2	86	{
8f3ba4e8	87	std::string fileHash;
495e5cb2 MV	88
495e5cb2 MV	89	FileFd Fd(filename, FileFd::ReadOnly);
f4c3850e	90	if(strcasecmp(Type.c_str(), "MD5Sum") == 0)
495e5cb2	91	{
2dcf7b8f	92	MD5Summation MD5;
109eb151	93	MD5.AddFD(Fd);
8f3ba4e8	94	fileHash = (std::string)MD5.Result();
2dcf7b8f	95	}
f4c3850e	96	else if (strcasecmp(Type.c_str(), "SHA1") == 0)
495e5cb2	97	{
2dcf7b8f	98	SHA1Summation SHA1;
109eb151	99	SHA1.AddFD(Fd);
8f3ba4e8	100	fileHash = (std::string)SHA1.Result();
2dcf7b8f	101	}
f4c3850e	102	else if (strcasecmp(Type.c_str(), "SHA256") == 0)
495e5cb2	103	{
2dcf7b8f	104	SHA256Summation SHA256;
109eb151	105	SHA256.AddFD(Fd);
8f3ba4e8	106	fileHash = (std::string)SHA256.Result();
495e5cb2	107	}
f4c3850e	108	else if (strcasecmp(Type.c_str(), "SHA512") == 0)
d9b9e9e2	109	{
2dcf7b8f	110	SHA512Summation SHA512;
109eb151	111	SHA512.AddFD(Fd);
8f3ba4e8	112	fileHash = (std::string)SHA512.Result();
d9b9e9e2	113	}
495e5cb2 MV	114	Fd.Close();
495e5cb2 MV	115
e6645b9f	116	return fileHash;
495e5cb2	117	}
92fcbfc1	118	/}}}/
f4c3850e	119	const char** HashString::SupportedHashes() /{{{/
495e5cb2 MV	120	{
	121	return _SupportedHashes;
	122	}
f4c3850e DK	123	/}}}/
f4c3850e DK	124	APT_PURE bool HashString::empty() const /{{{/
495e5cb2 MV	125	{
	126	return (Type.empty() \|\| Hash.empty());
	127	}
f4c3850e DK	128	/}}}/
	129	std::string HashString::toStr() const /{{{/
	130	{
	131	return Type + ":" + Hash;
	132	}
	133	/}}}/
	134	APT_PURE bool HashString::operator==(HashString const &other) const /{{{/
	135	{
	136	return (strcasecmp(Type.c_str(), other.Type.c_str()) == 0 && Hash == other.Hash);
	137	}
	138	APT_PURE bool HashString::operator!=(HashString const &other) const
	139	{
	140	return !(*this == other);
	141	}
	142	/}}}/
	143
b3501edb DK	144	bool HashStringList::usable() const /{{{/
	145	{
	146	if (empty() == true)
	147	return false;
	148	std::string const forcedType = _config->Find("Acquire::ForceHash", "");
	149	if (forcedType.empty() == true)
	150	return true;
	151	return find(forcedType) != NULL;
	152	}
	153	/}}}/
f4c3850e DK	154	HashString const * HashStringList::find(char const * const type) const /{{{/
	155	{
	156	if (type == NULL \|\| type[0] == '\0')
	157	{
b3501edb	158	std::string const forcedType = _config->Find("Acquire::ForceHash", "");
f4c3850e DK	159	if (forcedType.empty() == false)
	160	return find(forcedType.c_str());
	161	for (char const * const * t = HashString::SupportedHashes(); *t != NULL; ++t)
	162	for (std::vector<HashString>::const_iterator hs = list.begin(); hs != list.end(); ++hs)
	163	if (strcasecmp(hs->HashType().c_str(), *t) == 0)
	164	return &*hs;
	165	return NULL;
	166	}
	167	for (std::vector<HashString>::const_iterator hs = list.begin(); hs != list.end(); ++hs)
	168	if (strcasecmp(hs->HashType().c_str(), type) == 0)
	169	return &*hs;
	170	return NULL;
	171	}
	172	/}}}/
	173	bool HashStringList::supported(char const * const type) /{{{/
	174	{
	175	for (char const * const * t = HashString::SupportedHashes(); *t != NULL; ++t)
	176	if (strcasecmp(*t, type) == 0)
	177	return true;
	178	return false;
	179	}
	180	/}}}/
	181	bool HashStringList::push_back(const HashString &hashString) /{{{/
	182	{
	183	if (hashString.HashType().empty() == true \|\|
	184	hashString.HashValue().empty() == true \|\|
	185	supported(hashString.HashType().c_str()) == false)
	186	return false;
495e5cb2	187
f4c3850e DK	188	// ensure that each type is added only once
	189	HashString const * const hs = find(hashString.HashType().c_str());
	190	if (hs != NULL)
	191	return *hs == hashString;
	192
	193	list.push_back(hashString);
	194	return true;
	195	}
	196	/}}}/
	197	bool HashStringList::VerifyFile(std::string filename) const /{{{/
	198	{
	199	if (list.empty() == true)
	200	return false;
	201	HashString const * const hs = find(NULL);
	202	if (hs == NULL \|\| hs->VerifyFile(filename) == false)
	203	return false;
	204	return true;
	205	}
	206	/}}}/
	207	bool HashStringList::operator==(HashStringList const &other) const /{{{/
495e5cb2	208	{
b3501edb DK	209	std::string const forcedType = _config->Find("Acquire::ForceHash", "");
	210	if (forcedType.empty() == false)
	211	{
	212	HashString const * const hs = other.find(forcedType);
	213	HashString const * const ohs = other.find(forcedType);
	214	if (hs == NULL \|\| ohs == NULL)
	215	return false;
	216	return hs == ohs;
	217	}
f4c3850e DK	218	short matches = 0;
	219	for (const_iterator hs = begin(); hs != end(); ++hs)
	220	{
	221	HashString const * const ohs = other.find(hs->HashType());
	222	if (ohs == NULL)
	223	continue;
	224	if (hs != ohs)
	225	return false;
	226	++matches;
	227	}
	228	if (matches == 0)
	229	return false;
	230	return true;
	231	}
	232	bool HashStringList::operator!=(HashStringList const &other) const
	233	{
	234	return !(*this == other);
495e5cb2	235	}
f4c3850e	236	/}}}/
495e5cb2	237
b3501edb DK	238	// Hashes::Add* - Add the contents of data or FD /{{{/
	239	bool Hashes::Add(const unsigned char * const Data,unsigned long long const Size, unsigned int const Hashes)
	240	{
	241	bool Res = true;
	242	#if __GNUC__ >= 4
	243	#pragma GCC diagnostic push
	244	#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
	245	#endif
	246	if ((Hashes & MD5SUM) == MD5SUM)
	247	Res &= MD5.Add(Data, Size);
	248	if ((Hashes & SHA1SUM) == SHA1SUM)
	249	Res &= SHA1.Add(Data, Size);
	250	if ((Hashes & SHA256SUM) == SHA256SUM)
	251	Res &= SHA256.Add(Data, Size);
	252	if ((Hashes & SHA512SUM) == SHA512SUM)
	253	Res &= SHA512.Add(Data, Size);
	254	#if __GNUC__ >= 4
	255	#pragma GCC diagnostic pop
	256	#endif
	257	return Res;
	258	}
	259	bool Hashes::AddFD(int const Fd,unsigned long long Size, unsigned int const Hashes)
63b1700f AL	260	{
63b1700f AL	261	unsigned char Buf[64*64];
ce928105	262	bool const ToEOF = (Size == UntilEOF);
04f4e1a3	263	while (Size != 0 \|\| ToEOF)
63b1700f	264	{
650faab0	265	unsigned long long n = sizeof(Buf);
8f3ba4e8	266	if (!ToEOF) n = std::min(Size, n);
9ce3cfc9	267	ssize_t const Res = read(Fd,Buf,n);
650faab0	268	if (Res < 0 \|\| (!ToEOF && Res != (ssize_t) n)) // error, or short read
1dab797c	269	return false;
04f4e1a3	270	if (ToEOF && Res == 0) // EOF
1dab797c	271	break;
63b1700f	272	Size -= Res;
b3501edb DK	273	if (Add(Buf, Res, Hashes) == false)
b3501edb DK	274	return false;
63b1700f AL	275	}
63b1700f AL	276	return true;
109eb151	277	}
b3501edb	278	bool Hashes::AddFD(FileFd &Fd,unsigned long long Size, unsigned int const Hashes)
109eb151 DK	279	{
	280	unsigned char Buf[64*64];
	281	bool const ToEOF = (Size == 0);
	282	while (Size != 0 \|\| ToEOF)
	283	{
	284	unsigned long long n = sizeof(Buf);
	285	if (!ToEOF) n = std::min(Size, n);
	286	unsigned long long a = 0;
	287	if (Fd.Read(Buf, n, &a) == false) // error
	288	return false;
	289	if (ToEOF == false)
	290	{
	291	if (a != n) // short read
	292	return false;
	293	}
	294	else if (a == 0) // EOF
	295	break;
	296	Size -= a;
b3501edb DK	297	if (Add(Buf, a, Hashes) == false)
b3501edb DK	298	return false;
109eb151 DK	299	}
109eb151 DK	300	return true;
63b1700f AL	301	}
63b1700f AL	302	/}}}/
b3501edb DK	303	HashStringList Hashes::GetHashStringList()
	304	{
	305	HashStringList hashes;
	306	#if __GNUC__ >= 4
	307	#pragma GCC diagnostic push
	308	#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
	309	#endif
	310	hashes.push_back(HashString("MD5Sum", MD5.Result().Value()));
	311	hashes.push_back(HashString("SHA1", SHA1.Result().Value()));
	312	hashes.push_back(HashString("SHA256", SHA256.Result().Value()));
	313	hashes.push_back(HashString("SHA512", SHA512.Result().Value()));
	314	#if __GNUC__ >= 4
	315	#pragma GCC diagnostic pop
	316	#endif
	317	return hashes;
	318	}
	319	#if __GNUC__ >= 4
	320	#pragma GCC diagnostic push
	321	#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
	322	#pragma GCC diagnostic ignored "-Wsuggest-attribute=const"
	323	#endif
	324	Hashes::Hashes() {}
	325	Hashes::~Hashes() {}
	326	#if __GNUC__ >= 4
	327	#pragma GCC diagnostic pop
	328	#endif