Auth 7702

[btchip]

Explanation

This PR adds basic support for EIP 7702 (https://github.com/ethereum/EIPs/blob/master/EIPS/eip-7702.md) authorization signature and signature of TX type 4

You might want to add extra checks to the authorized contracts for delegation

Pre-merge check list

• PR run build successfully on local machine.
• All unit tests passed locally.

How to test

Generate the 7702 authentication RLP to sign with Foundry (cast wallet sign-auth) and remove v,r,s (using for example https://codechain-io.github.io/rlp-debugger/)

Generate a new QR code for a 7702 authentication (dataType 5) with this RLP and scan it

Testing a TX type 4 can also be done with Foundry (cast mktx with --auth parameter)

[nconsigny]

Hey there,

Posting a list of known implementations, if you have any question I'm here to help :

Alchemy : https://github.com/alchemyplatform/modular-account
Ambire : https://github.com/AmbireTech/ambire-common/blob/feature/eip-7702/contracts/AmbireAccount7702.sol
Metamask : https://github.com/MetaMask/delegation-framework
AA team EF : https://github.com/eth-infinitism/account-abstraction/blob/develop/contracts/accounts/Simple7702Account.sol