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Create four-byte signature search tool in Go
great-hill-corporation
Go, keccak256
### Instructions
After unzipping the data files found in the folder ./src/other/find4Byte and using the same techniques as are used by the Solidity compiler to build 4-byte codes out of canonical function signatures, cross multiply a list of the 100,000 most commonly-used English words (provided in the file `function_names.csv`) with 680 argument lists (provided in the file `function_signatures.csv`) searching for the given 4-byte code by applying keccak256 to each resulting function signature.
The delivered code should be
- written in 'Go',
- should be able to parse a simple command line that includes one or more four byte codes (each starting with `0x`), and
- deliver matches to the `standard output`, while delivering progress to `standard err`.
The search should be done in parallel and be as fast as possible. Use of Go channels is preferred.
Even if a given four-byte code is found, the program should continue searching as there may be multiple matches the canonical signature. We would like to find all matches.
C++ like pseudo code follows:
### Pseudo Code in C++ (the deliverable should be in 'Go')
int main(int argc, char *argv[]) {
if (argc != 2) return 0;
search = argv[1];
names = file containing 100,000 common English words
sigs = file containing ~700 function signatures
cout << "Scanning " << names.size() << " names ";
cout << "and " << sigs.size() << " signatures (";
cout << (names.size() * sigs.size()) << " total) for 4-byte code " << search << endl;
for (every name : names) {
for (every sig : sigs) {
canonical = name + "(" + sig + ")";
fourByte = '0x' + keccak256(canonical).substr(0, 8);
if (fourByte == search) {
cout << "Found: " << fourByte << "\t" << canonical << endl;
} else {
cerr << "Scanning << canonical << "\r";
cerr.flush();
}
}
}
return 1;
}
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