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package main
import (
"bytes"
"crypto/md5"
"fmt"
"strconv"
)
func hash(secret []byte, x int64) [16]byte {
str := strconv.AppendInt(secret, x, 10)
return md5.Sum(str)
}
func check(hash [16]byte, target []byte, length int) bool {
str := []byte(fmt.Sprintf("%x", hash))
return bytes.Equal(str[:length], target[:length])
}
func main() {
secret := []byte("iwrupvqb")
target := []byte("000000")
x := int64(1)
got5, got6 := false, false
for !(got5 && got6) {
h := hash(secret, x)
if !got5 && check(h, target, 5) {
fmt.Println("Lowest number for 5-zeroes hash:", x)
got5 = true
}
if !got6 && check(h, target, 6) {
fmt.Println("Lowest number for 6-zeroes hash:", x)
got6 = true
}
x += 1
}
}
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