Simple (and largely pointless) hash generator in Go

brutix.go

// Wrote this to try bruteforcing a hash key in part of the Stripe CTF game. 
// I realise it would take something like 100 million years to find it, but I'd never written a hash generator before. 
// Putting this on GitHub in case anyone's interested.

package main

import (
  "math/rand"
  "strings"
  "bytes"
  "fmt"
  "crypto/sha1"
)

const Maxlen = 14
const Matching = "count=10&lat=37.351&user_id=1&long=-119.827&waffle=eggo"
const LookingFor = "7624a445bbb826611cd903770d8d42b414952090"

func generateKey(N int, channel chan string) {
  chars := "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
  for {
    r := make([]string, N)
    for i := 0; i < N; i++ {
      c := chars[rand.Intn(len(chars))]
      r[i] = string(c)
    }
    str := strings.Join(r, "")
    channel <- str
  }
}

func main() {
  channel := make(chan string)
  go generateKey(14, channel)
  for {
    str := <-channel
    fmt.Println(str)

    // Join for hashing
    var buffer bytes.Buffer
    buffer.WriteString(str)
    buffer.WriteString(Matching)

    sha := sha1.New()
    sha.Write([]byte(buffer.String()))
    hash := fmt.Sprintf("%x", sha.Sum(nil))
    fmt.Println(hash)

    if hash == LookingFor {
      fmt.Println("Found")
      break
    }
  }
}