Support JWT signing for Stacks authentication

[kyranjamie]

As mentioned in Slack, in order for the Stacks Ledger integration to be compatible with the Stack authentication flow, a JWT payload needs to be signed by a key on the "identities keychain", the m/888'/0' derivation path.

This feature would need to accept a JWT payload and return a signature.

The implementation would need to function the same as our TypeScript implementation found here.

• Is the device capable of handing and signing a JWT?
• How large of an effort would this be to implement?

[neithanmo]

@kyranjamie i opened a PR, can you take a look. it omits network version and returns a publicKey using the path you described above.

[kyranjamie]

Thanks @neithanmo! Good stuff. (You mean the issue #103 though)

[markmhendrickson]

@neithanmo To be clear, the PR you've linked above (https://github.com/Zondax/ledger-blockstack/pull/104) resolves this particular issue (for complete JWT signing) or simply the one that Kyran has linked (#103, for passing a m/888' leading derivation path as a preliminary fix)?

[neithanmo]

@neithanmo To be clear, the PR you've linked above (#104) resolves this particular issue (for complete JWT signing) or simply the one that Kyran has linked (#103, for passing a m/888' leading derivation path as a preliminary fix)?

it fixed the issue with the new derivation path. which is required by the JWT feature. later this week will open a PR with the full JWT support.

[neithanmo]

closed via #111