Git-Mirrors/RetroShare
1
0
Fork 0
mirror of https://github.com/RetroShare/RetroShare.git synced 2024-12-28 17:09:34 -05:00
Code Issues Actions Packages Projects Releases Wiki Activity

fixed generation of pseudo-random request ids in p3filelists

Browse Source
This commit is contained in:
csoler 2016-11-05 16:07:30 +01:00
parent 1e919a141c
commit a97fa1e2cb
1 changed files with 14 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

30
libretroshare/src/file_sharing/p3filelists.cc
View File

@ -39,7 +39,7 @@
#define P3FILELISTS_DEBUG() std::cerr << time(NULL) << " : FILE_LISTS : " << __FUNCTION__ << " : "
#define P3FILELISTS_ERROR() std::cerr << "***ERROR***" << " : FILE_LISTS : " << __FUNCTION__ << " : "
#define DEBUG_P3FILELISTS 1
//#define DEBUG_P3FILELISTS 1
static const uint32_t P3FILELISTS_UPDATE_FLAG_NOTHING_CHANGED = 0x0000 ;
static const uint32_t P3FILELISTS_UPDATE_FLAG_REMOTE_MAP_CHANGED = 0x0001 ;
@ -1454,25 +1454,23 @@ void p3FileDatabase::locked_recursSweepRemoteDirectory(RemoteDirectoryStorage *r
p3FileDatabase::DirSyncRequestId p3FileDatabase::makeDirSyncReqId(const RsPeerId& peer_id,const RsFileHash& hash)
{
static uint64_t random_bias = RSRandom::random_u64();
uint64_t r = 0 ;
uint8_t mem[RsPeerId::SIZE_IN_BYTES + RsFileHash::SIZE_IN_BYTES];
memcpy(mem,peer_id.toByteArray(),RsPeerId::SIZE_IN_BYTES) ;
memcpy(&mem[RsPeerId::SIZE_IN_BYTES],hash.toByteArray(),RsFileHash::SIZE_IN_BYTES) ;
RsFileHash tmp = RsDirUtil::sha1sum(mem,RsPeerId::SIZE_IN_BYTES + RsFileHash::SIZE_IN_BYTES) ;
// This is kind of arbitrary. The important thing is that the same ID needs to be generated every time for a given (peer_id,entry index) pair, in a way
// that cannot be brute-forced or reverse-engineered, which explains the random bias and the usage of the hash, that is itself random.
for(uint32_t i=0;i<RsPeerId::SIZE_IN_BYTES;++i)
{
r ^= (0x011933ff92892a94 + peer_id.toByteArray()[i] * 0x1001fff92ee640f9) ;
r <<= 8 ;
r += 0xf392843890321808;
}
for(uint32_t i=0;i<RsFileHash::SIZE_IN_BYTES;++i)
{
r ^= (0x011933ff92892a94 + hash.toByteArray()[i] * 0x1001fff92ee640f9) ;
r <<= 8 ;
r += 0xf392843890321808;
}
uint64_t r = random_bias ^ *((uint64_t*)tmp.toByteArray()) ;
return r ^ random_bias;
#ifdef DEBUG_P3FILELISTS
std::cerr << "Creating ID " << std::hex << r << std::dec << " from peer id " << peer_id << " and hash " << hash << std::endl;
#endif
return r ;
}
bool p3FileDatabase::locked_generateAndSendSyncRequest(RemoteDirectoryStorage *rds,const DirectoryStorage::EntryIndex& e)
@ -1522,7 +1520,7 @@ bool p3FileDatabase::locked_generateAndSendSyncRequest(RemoteDirectoryStorage *r
data.flags = item->flags;
#ifdef DEBUG_P3FILELISTS
P3FILELISTS_DEBUG() << " Pushing req in pending list with peer id " << data.peer_id << std::endl;
P3FILELISTS_DEBUG() << " Pushing req " << std::hex << sync_req_id << std::dec << " in pending list with peer id " << data.peer_id << std::endl;
#endif
mPendingSyncRequests[sync_req_id] = data ;