Calldata Decoder

A black-box raw calldata decoder using only calldata. Based off the topics discussed in DeGatchi's article, Reverse The EVM: Raw Calldata.

Demo

Features

• Selector detector
• Parameter parser
  • Parameter relation mapping
• Parameter type guesser
  • For main body
  • Nested (multicall)
  • Optimised address detector

Todo

[ ] - Put tests in their own files bc they're so big (to decode the values).

[ ] - Parameter parser: Parameter relation mapping

How to implement

If dynamic type:

1. Track offset.
2. Find length from offset.
3. Get values.
4. If values have dynamic types map them to a second branch.
5. Then we can build the potential struct/array used as a param.

[ ] - Parameter type guesser: For main body

How to implement

For 0x60 at 0x40:

1. Check value above -> Is there a main body param above or is it standalone?
2. Check value below -> Is it the offset? if not its the next main body param.
3. Are there enough bytes to finish the dynamic type?
4. Is there any more params after?

Then we need to create a test for this ^

Contributing

This repo can be expanded to become much more sophisticated. There are some core features missing.

If you feel contributing please feel free to make a pr :)