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changed GxsTunnel method for computing turtle hash, to avoid crashing old peers

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This commit is contained in:
csoler 2015-12-07 23:09:44 -05:00
parent 0957e7068a
commit 893f178ce1
1 changed files with 4 additions and 4 deletions
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8
libretroshare/src/gxstunnel/p3gxstunnel.cc
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@ -1389,14 +1389,14 @@ TurtleFileHash p3GxsTunnelService::randomHashFromDestinationGxsId(const RsGxsId&
assert(Sha1CheckSum::SIZE_IN_BYTES == 20) ;
uint8_t bytes[20] ;
memcpy(bytes,destination.toByteArray(),16) ;
memcpy(&bytes[4],destination.toByteArray(),16) ;
RAND_bytes(&bytes[16],4) ; // fill the last bytes with random crap. Very important to allow tunnels from different sources and statistically avoid collisions.
RAND_bytes(&bytes[0],4) ; // fill the 4 first bytes with random crap. Very important to allow tunnels from different sources and statistically avoid collisions.
// We could rehash this, with a secret key to get a HMAC. That would allow to publish secret distant chat
// passphrases. I'll do this later if needed.
return Sha1CheckSum(bytes) ;
return Sha1CheckSum(bytes) ; // this does not compute a hash, and that is on purpose.
}
RsGxsId p3GxsTunnelService::destinationGxsIdFromHash(const TurtleFileHash& sum)
@ -1404,7 +1404,7 @@ RsGxsId p3GxsTunnelService::destinationGxsIdFromHash(const TurtleFileHash& sum)
assert( RsGxsId::SIZE_IN_BYTES == 16) ;
assert(Sha1CheckSum::SIZE_IN_BYTES == 20) ;
return RsGxsId(sum.toByteArray());// takes the first 16 bytes
return RsGxsId(&sum.toByteArray()[4]);// takes the last 16 bytes
}
bool p3GxsTunnelService::getTunnelInfo(const RsGxsTunnelId& tunnel_id,GxsTunnelInfo& info)