Parity-ethereum: Hardware wallets don't support signing arbitrary messages: "Unknown binary data"

[politician]

I'm using Parity/1.6.8/1.17.0/ma
I'm using the latest Parity Chrome extension
I'm using a Nano Ledger S with Ethereum app v1.0.8
I'm browsing the Dapp https://etherdelta.github.io

If I try to place a buy or a sell order on a pair, I get the following error and I cannot confirm request (it doesn't even come up on the nano like it should do)

When I go to my parity UI, I can see in the signer this request and when I try to confirm it from there, it throws the error "[-32021] Account password is invalid or account does not exist." while the expected behaviour is to prompt on my hardware wallet to confirm transaction.

To be noted that I can fill existing buy or sell orders, but cannot place them. It works like a charm with the default parity wallet without using a hardware wallet.

[5chdn]

Just to make sure, is contract support enabled on your ledger?

Does your ledger show up in accounts list as colored identicon or gray?

[politician]

Yes contract support is enabled. Ledger shows up as a colored icon.
Food for thoughts: I believe Etherdelta handles placing a buy/sell order differently than actually buying or selling into an existing order. It seems like it's not doing a transaction but rather authorizing Etherdelta to make this transaction later. @frenchhoudini @zackcoburn could help understand this.

[zackcoburn]

Correct. Placing an order on EtherDelta involves signing a message, whereas
trading against an existing order involves sending a transaction.

On Wed, Jul 19, 2017 at 6:17 AM Romain Barissat [e-mail]
wrote:

Yes contract support is enabled. Ledger shows up as a colored icon.

Food for thoughts: I believe Etherdelta handles placing a buy/sell order
differently than actually buying or selling into an existing order. It
seems like it's not doing a transaction but rather authorizing Etherdelta
to make this transaction later. @frenchhoudini
https://github.com/frenchhoudini @zackcoburn
https://github.com/zackcoburn could help understand this.

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[alfiehub]

I also have the same problem using Parity 1.7.0 and EtherDelta.
If anyone has any pointers to where the problem might lie I'll be glad to help out.

[tomusdrw]

Looks like hardware support for signatures is missing, somewhere over here:
https://github.com/paritytech/parity/blob/604ea5d684b05f63ab2a32f68fdf50b8bbe38498/rpc/src/v1/helpers/dispatch.rs#L516

I'll have a look.

[tomusdrw]

Since the hardware wallets don't support signing arbitrary messages yet it's not possible to implement that.
Please re-open if the hardware supports this.

[btchip]

It should support personal signing (see https://github.com/LedgerHQ/ledger-node-js-api/blob/master/src/ledger-eth.js#L113) - is this what you're looking for ?

[arkpar]

@btchip Interesting, this could use some documentation at https://raw.githubusercontent.com/LedgerHQ/blue-app-eth/master/doc/ethapp.asc

What is the minimum required eth app version that supports this? Is the message presented on the device display hex-encoded?

[btchip]

that's right, I'll update the documentation. This message has been added into version 1.0.8 - the device displays a sha256 hash of the message sent to be signed (to handle the case where a long binary message is sent)

[5chdn]

This is not limited to hardware wallets, isn't it?

[mrbrdo]

This is crucial to support using EtherDelta with Ledger Nano through Parity (I don't think there is any other alternative right now to use ED with a hardware wallet)!

👍 @arkpar

[folsen]

@tomusdrw This isn't implemented on the client side yet right? I don't believe we necessarily want to do any UI changes, but we should probably have this ability on node-side. If it's not done then maybe @niklasad1 can pick it up?

[niklasad1]

Update, I got it working but it will take some time to get it PR ready!