trailofbits/manticore

research/consider matching solidity abi api

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#1,069 opened on Aug 22, 2018

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Description

https://solidity.readthedocs.io/en/latest/units-and-global-variables.html#abi-encoding-and-decoding-functions

abi.decode(bytes encodedData, (...)) returns (...): ABI-decodes the given data, while the types are given in parentheses as second argument. Example: (uint a, uint[2] memory b, bytes memory c) = abi.decode(data, (uint, uint[2], bytes)) abi.encode(...) returns (bytes): ABI-encodes the given arguments abi.encodePacked(...) returns (bytes): Performs packed encoding of the given arguments abi.encodeWithSelector(bytes4 selector, ...) returns (bytes): ABI-encodes the given arguments starting from the second and prepends the given four-byte selector abi.encodeWithSignature(string signature, ...) returns (bytes): Equivalent to abi.encodeWithSelector(bytes4(keccak256(bytes(signature))), ...)`

Contributor guide

Research direction
Review the Solidity ABI encoding/decoding functions (abi.encode, abi.decode, etc.) and assess how to implement matching functionality in Manticore. Consider the encoding rules, packed encoding, and selector handling.
Tech stack
python
Domain
blockchainsecurity
Issue type
Research
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
PythonSolidity basics
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
45