path: root/challenge/c04.go

// Copyright © 2020 rsiddharth <s@ricketyspace.net>
// SPDX-License-Identifier: ISC

package challenge

import (
	"fmt"
	"ricketyspace.net/cryptopals/lib"
)

const blob = `
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1c595d183539220eec123478535337110424f90a355af44c267be848173f
41053f5cef5f6f56e4f5410a5407281600200b2649460a2e3a3c38492a0c
4c071a57e9356ee415103c5c53e254063f2019340969e30a2e381d5b2555
32042f46431d2c44607934ed180c1028136a5f2b26092e3b2c4e2930585a`

var blobs = make([]string, 327)

func init() {
	for i, j := 1, 0; i < len(blob); i++ {
		if blob[i] == '\n' {
			j += 1
			i += 1
		}
		blobs[j] += string(blob[i])
	}
}

func C4() {
	i, k, ds, scr := 0, byte(0), "", 100.0
	for j := 0; j < len(blobs); j++ {
		c, as, s := lib.XORCrackSingleKey(blobs[j])
		if s < scr {
			i = j
			k = c
			ds = as
			scr = s
		}
	}
	fmt.Printf("Blob encrypted with a single character: %v\n", blobs[i])
	fmt.Printf("Key is '%c'\n", k)
	fmt.Printf("Decrypted string: '%v' (Score: %v)\n", ds, scr)
}