I just learn Golang this week. I learn Golang by creating a simple personal case to make it easier to learn.
I saw this thread and I got an idea to build a md5 cracker.
I tried this code but it doesnt work like I want. what did I missed and how to separate the process efficiently to make it faster?
runtime.GOMAXPROCS(2)
var wg sync.WaitGroup
for combination := range GenerateCombinations(alpha, length) {
wg.Add(2)
go func() {
defer wg.Done()
if hash == GetMD5Hash(combination) {
fmt.Println(“hash → " + combination)
//return true
}
}()//fmt.Println(”—=== " + combination + " ===—“)
go func() {
defer wg.Done()
if hash == GetMD5Hash(combination) {
fmt.Println(“hash → " + combination)
//return true
}
}()//fmt.Println(”—=== " + combination + " ===—”)
I want to separate the process by the first letter. for example:
a to aaaaaa = run in process 1
b to bbbbbb = run in process 2
c to cccccc = run in process 3
etc
Sorry, I was not on my PC right now, but I will post it later ASAP.
I’m using time.Now and time.Since to benchmark the process with/without multithreaded and the result for multithreaded was longer than single process.
Not exactly sure what you are trying to do here, but from the sounds of it, you might be looking for something like this:
package main
import (
"crypto/md5"
"fmt"
)
func worker(in, out chan string, done chan struct{}, i int) {
for {
select {
case <-done:
return
case str := <-in:
// Send the hash of str and the current goroutine worker
// number on the out channel.
out <- fmt.Sprintf("%d: %x", i, md5.Sum([]byte(str)))
}
}
}
func main() {
in, out := make(chan string), make(chan string)
done := make(chan struct{})
// Start 25 worker goroutines.
for i := 0; i < 25; i++ {
go worker(in, out, done, i)
}
// Send the data on the in channel.
go func() {
for i := 0; i < 10; i++ {
in <- fmt.Sprintf("Hello, %d", i)
}
}()
// Receive the data from the out channel.
for i := 0; i < 10; i++ {
fmt.Println(<-out)
}
// Close done so all of the worker goroutines exit and
// no goroutines are leaked.
close(done)
}
I remember it being a good read. Enjoy!