Add support for Ethereum

9876691 commented 6 years ago

This is basically to re-write a ruby class into crystal. https://github.com/onchain/onchain-gem/blob/master/lib/onchain/ethereum.rb

Create a class called EthereumTransaction that implements the transaction interface. i..e

EthereumTransaction < Transaction
   property data: String
   property gas_limit: UInt64
   property gas_price: UInt64
   property nonce: UInt32
   property to: String
   property value: BigInt
   property v: UInt32?
   property s: String?
   property r: String?
  ....
end

Implement an initialise method that creates the underlying representation from hexidecimal, the initialise doesn't need to set the r,s,v properties

implement the to_hex method.

Implement the hash_to_sign method. This is the keccak 256 hash of the transaction.

Implement a sign method. This takes the r,s,v values and adds them. After which calling to_hex will create a fully signed ethereum transaction.

You can see the way this fits together in the https://github.com/onchain/paper-wallet-spender/blob/master/src/onchain/protocol/zcash_transaction.cr class.

9876691 commented 6 years ago

This should help. https://medium.com/@codetractio/inside-an-ethereum-transaction-fa94ffca912f

9876691 commented 6 years ago

Test Case 1.

Initialise the EthereumTransaction.new with the following data.

to = 0xaA429FeDC40Eaa82894E5a9d6a678Ea57ac19DAf
from = 0x46FC2341DC457BA023cF6d60Cb0729E5928A81E6
amount = 1000000000000000 
GAS_LIMIT = 30_000
GAS_PRICE = (0.00000002 * 1_000_000_000_000_000_000).to_i

Call to_hex you should get the following result.

0xeb0c8504a817c80082753094aa429fedc40eaa82894e5a9d6a678ea57ac19daf87038d7ea4c6800000808080

9876691 commented 6 years ago

Test Case 2

Initialise the eth_tx = EthereumTransaction.new with the a hexedecimal transaction.

0xeb0c8504a817c80082753094aa429fedc40eaa82894e5a9d6a678ea57ac19daf87038d7ea4c6800000808080

Then

eth_tx.to.should eq("0xaA429FeDC40Eaa82894E5a9d6a678Ea57ac19DAf")
eth_tx.amount.should eq(1000000000000000)

eth_tx.to_hex should bring back the same hex as before i.e.

0xeb0c8504a817c80082753094aa429fedc40eaa82894e5a9d6a678ea57ac19daf87038d7ea4c6800000808080

9876691 commented 6 years ago

Test Case 3

Initialise the eth_tx = EthereumTransaction.new with the a hexedecimal transaction.

0xeb0c8504a817c80082753094aa429fedc40eaa82894e5a9d6a678ea57ac19daf87038d7ea4c6800000808080

eth_tx.hash_to_sign.should eq("b243b9b6e4a7865e8c5429653e3e2153e26424ad59ea96768981a01cf13944f5")

onchain / paper-wallet-spender

Add support for Ethereum #6