Solidity <> Cairo Keccak example

Example repo on how to make Cairo's Keccak hash match with Solidity’s Keccak and vice-versa!

Contracts

The contracts directory contains the following sub-folders:

contracts/cairo
	utils/ - contains utility functions as bytes and some other common functions
	example.cairo - the main contract that calculate keccak256(abi.encodePacked(...)) in cairo.

contracts/solidity
	example.sol - the main contract that return keccak256(abi.encodePacked(...));

Functions

• getKeccakOnlyUint

return keccak256(abi.encodePacked(uint256, uint256));

• getKeccakUintAddress

return keccak256(abi.encodePacked(uint256, address));

• getKeccakAddressUint

return keccak256(abi.encodePacked(address, uint256));

• getKeccakUint8

return keccak256(abi.encodePacked(uint8, uint8));

Running the tests

1. Make sure to have docker installed and running.

2. yarn install to install the required packages including StarkNet.js, HardHat, and the StarkNet Hardhat Plugin.

make sure you have at least cairo lang version 0.10.3, check with -> starknet --version

1. yarn compile to create ./starknet-artifacts/ with the compiled contracts.

2. Open another terminal, then run npx hardhat node.

make sure you are running devnet version at least 0.4.4

1. Open another terminal, then run starknet-devnet --seed 0.

2. yarn test to execute the test.

Exercises

In the ./exercises folder you can find couple of tests to play with and try to get the same hash!