Cannot sign message with params using Nano S ledger | error_message: "Data is invalid : Unexpected number of items"

[fabriziogianni7]

I'm trying to sign a message with simple params but I can't do that. I'm using a Nano S ledger with expert mode: enabled I updated the Filecoin Ledger App and the ledger firmware

I have this error:

error_message: "Data is invalid : Unexpected number of items"
return_code: 27012
signature_compact: 
Uint8Array(28) 
[85, 110, 

Debugging, I saw that I'm calling sign() function and it returns this error.

the message I want to send look like this:

from: "t1y6grz7kkjs5wyvg4mp5jqjl3unqt7t5ktqlrf2q"
gasfeecap: "101365"
gaslimit: 277620
gaspremium: "100311"
method: 0
nonce: 0
params: "Y2lhbw=="
to: "t01000"
value: "0"

the call:

await this.ledgerApp.sign(m/44'/${this.lotusNode.code}'/0'/0/${indexAccount}, Buffer.from(serializedMessage, 'hex'))

in my package.json:

"@zondax/ledger-filecoin": "^0.11.1",

I'm using this to format the params:

Buffer.from('ciao','hex').toString('base64'))

Thank you very much for supporting

[rllola]

Hello @fabriziogianni7 ,

If I am not mistaken when signing a transaction with method 0 the app doesn't expect to have any parameters given and if so will reject the transaction.

Is there any reason why you are trying to sign a simple send transaction with parameters ?

[fabriziogianni7]

ok, thank you. yes. we would like to 'verify' the address passing in some random 4 digit string. do you know what method should I use then?

[rllola]

Just by curiosity, does such a transaction is valid when send to a Filecoin node ? If a Filecoin node support such a transaction it might make sense to be a bit more loose on ledger app.

Could you give a bit more context on why you want to verify an address by signing a transaction ? Would this transaction be broadcasted ?

[fabriziogianni7]

Sure, So, we want to see if users are sending transaction using our Dapp. We need to do it just once and we will return the messageCID.

[rllola]

Have you tried with a signed transaction but that's not been signed with the ledger app ? Or you want to use the ledger app as a way to sign your transaction ?

We need to do it just once and we will return the messageCID.

So it won't be broadcasted.

If you are just looking for a way to sign a transaction for testing you might be interested in this library : https://github.com/Zondax/filecoin-signing-tools

[fabriziogianni7]

Yes, Signing without ledger is working. I wanted to do the same with ledger

[rllola]

Got it. So I don't see it working with an other method for now.

What we can do is to remove the restriction on method 0 and allow signing if there is parameter. However it will take a bit of time and this change will need to be approved beforehand.

[fabriziogianni7]

How long you think it does take to do that? Thank you very much for the support.

[rllola]

It is difficult to tell because there is a long process when releasing new update.

However you should be able to test it by compiling directly from the repo. I would advice to do it on a new ledger without any sensible data on it and to proceed with caution tho. I think next week I can have a branch for you to test against.

EDIT: also please note that this would need to be green light first

[fabriziogianni7]

ok. Thank you very much. let me know if I can be of any help then!

[rllola]

Hi @fabriziogianni7 Here the branch : https://github.com/Zondax/ledger-filecoin/tree/misc/transfer-params You can follow the instructions in the README to test it on a ledger (that has nothing on it).