Issues with importing ethereum compatible accounts from parity signer app

[joelamouche]

Error 1

1. I use the metadata of moonriver (or other moonbeam related ethereum-compatible network) to create an account on the parity signer app
2. I try to import it into the account in the browser app
3. in the console: invalid publicly provided, because the mobile app generates a substrate address instead of an ethereum compatible address
   

Proposed solution

Popup an error message for ethreum compatible parachains, since users are not supposed to use the mobile app that way

Error 2


1. Create an ethereum account on mobile app (in the etheruem section of the app)
2. try to import form ethereum wallet in parity signer into the browser app: Expect substrate/secret address and get ethereum
   

Proposed Solution

allow ethereum prefix for ethereum compatible parachains

Im off course volunteering to implement the solutions

[jacogr]

For Error 1 - we could actually accept both I believe, at least on the keyring side. Since the decoding of the ss58 should just yield the Ethereum address. However, this may be completely broken now that I think of it if we pass the full publicKey there.

On 2, yes, indeed, we should just extend that check.

[joelamouche]

So here is the problem with importing ethereum addresses from the mobile signer (related to polkadot-js/extension#758) :
The QR code only provides the address (20bytes) but not the publicKey (32bytes).
In addExternal (ui-keyring):

const pair = this.keyring.addFromAddress(address, _objectSpread(_objectSpread({}, meta), {}, {
      isExternal: true
    }), null);

works well but returns a 20bytes publicKey, which throws an error in saveAccount

What should we do about that?

• Make saveAccount more tolerant about 20bytes pubKey
• modify addFromAddress (keyring) to append publicKey with 12 zeros?

[joelamouche]

@jacogr please take a look when you have time

[jacogr]

I would go for the first option to make it more tolerant - basically if we go for the second, we end up with a publicKey that is completely different and then we will derive a completely different address from it as well.

To go for option 1, not sure what it entails atm, I fear we may need to add something "hacky" somewhere to cater for this.

[joelamouche]

this little modification is what it takes : polkadot-js/common#1032 @jacogr

[joelamouche]

this PR is necessary polkadot-js/ui#491 also

[joelamouche]

@albertov19 please test again and confirm desired behavior

[jacogr]

Is this still an ongoing issue?

[joelamouche]

Currently the problem is with the Parity Signer mobile app itself and not the app (see novasamatech/parity-signer#787 (comment))

[polkadot-js-bot]

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