HashBash

A collection of tools to experiment with diffrent hash functions. Made during internship. A lot of the tools are specially made for myself and may seem a little unnecessary, but they helped me understand the SHA-256 hash function further.

Why

The tools are made to experiment with hash functions. Online tools don't let you hash binary value, so it is hard to test diffrent points of intrest against each other

And the padding makes it so that some points of intrest ar not able to compare to each other. If you want to compare 512 zeros to 1024 zeros the padding adds message length, so that the comparising isn't usefull

How

The tools work by running go build /toolname/ then use ./toolname to run tool

What

The different tools currently availible are:

Tools

tool	use
binary input	This tool takes binary input and gives a hash back, both in binary as in a hexidecimal represitation.
pad	this tool takes binary input and gives the padding that would be used in the sha256 hashfunction
zeros	gives a string of zeros with a user-chosen length
ones	gives a string of ones with a user-chosen length
Timing	Times the the diffrence between own and traditional method and makes a chart

Examples

Example	Use	Why
No skew hash	build with go build NoSkewHash.go	Aims to help prove A
Skew hash	build with go build NoSkewHash.go	Aims to help prove A
Not all outputs	build with go build NoSkewHash.go	Aims to help prove A
Hash.go	run with go run Hash.go	Baseline for custom SHA256 research implementations
Timing	change the value of n to select how many bytes are checked, change first forloop to change number of results

A

This theory is false

mb = message block h = compression function H = hash function O = Output l = length h(mb)=h(mb) h(mb)^(Ol+1)≠h(mb) proves H:A→B ∃x ∈ [0,2^l)∶ x ∉ B