cryptopals

README

cryptopals

Answers to the Matasano Cryptopals challenges.

Run go test ./solutions to check all solutions.

This code is extremely unsuited for production use — don't copy from it.

Documentation

Overview

Package cryptopals contains utility functions for the Cryptopals challenges.

Index

• func Blocks(b []byte, n int) [][]byte
• func HammingDistance(a, b []byte) int
• func ProbabilityIsEnglish(b []byte) float64
• func XOR(x, y []byte) []byte
• func XORByte(x []byte, y byte) []byte
• func XORRepeat(x, y []byte) []byte

Functions

func Blocks

func Blocks(b []byte, n int) [][]byte

Blocks returns consecutive subslices of b of length n, except for the final block which may be shorter than n.

func HammingDistance

func HammingDistance(a, b []byte) int

HammingDistance returns the Hamming distance between a and b. If len(a) != len(b), it panics.

func ProbabilityIsEnglish

func ProbabilityIsEnglish(b []byte) float64

ProbabilityIsEnglish returns the probability that b is English text.

func XOR

func XOR(x, y []byte) []byte

XOR returns x ^ y. If len(x) != len(y), it panics.

func XORByte

func XORByte(x []byte, y byte) []byte

XORByte returns the result of xor'ing each byte of x with y.

func XORRepeat

func XORRepeat(x, y []byte) []byte

XORRepeat returns x ^ y, repeating y if it's too short. The result has length len(x).