Namehash for empty domain does not equal 0x0

[mortelli]

Hello,

I've decided to open a question issue here since I have got no reply from the go-ethereum gitter or discord.

It is my understanding that the namehash for the empty string domain should result in the 0x00000000000000000000000000000000 hash.

However, when calling the ens.EnsNode function (ethereum/go-ethereum/contracts/ens/ens.go:103) with "" as input, the output is a different hash.

Is this a bug, or expected behavior? If the latter is the case, why?

System information

Geth
Version: 1.9.0-unstable
Architecture: amd64
Protocol Versions: [63 62]
Network Id: 1
Go Version: go1.11.2
Operating System: linux

Expected behaviour

fmt.Printf("%v", ens.EnsNode("")) → [0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0]

Actual behaviour

fmt.Printf("%v", ens.EnsNode("")) → [136 212 132 58 243 2 194 9 50 134 137 140 211 76 186 122 71 28 60 220 228 199 133 20 252 151 28 60 106 83 137 30]

[holiman]

It is my understanding that the namehash for the empty string domain should result in the 0x00000000000000000000000000000000 hash.

I don't know how that could be. @Arachnid does that seem correct to you?

[holiman]

Also, the ens.go was removed by #15808 -- not sure if that was intentional or by mistake. @fjl ?

[holiman]

Sorry, it was dropped by #19661

[holiman]

The swarm-team was maintaining this, it's now been moved out from go-ethereum. Please file a ticket with https://github.com/ethersphere/swarm instead

[mortelli]

Thank you @holiman, I will do that.