Combine AoC Repos

2016/day05/main.go

@@ -0,0 +1,118 @@
+package main
+
+import (
+	"bufio"
+	"crypto/md5"
+	"fmt"
+	"log"
+	"math/rand"
+	"os"
+	"strconv"
+	"strings"
+	"time"
+)
+
+func main() {
+	input := stdinToString()
+	partOne(input)
+	partTwo(input)
+}
+
+func partOne(input string) {
+	complete := false
+	idx := 1
+	password := ""
+	for !complete {
+		if idx%1000000 == 0 {
+			fmt.Print("O")
+		} else if idx%100000 == 0 {
+			fmt.Print(".")
+		}
+		sum := fmt.Sprintf("%x", md5.Sum([]byte(input+itoa(idx))))
+		if strings.HasPrefix(sum, "00000") {
+			fmt.Println("d")
+			fmt.Println(itoa(idx))
+			password += string(sum[5])
+		}
+		idx++
+		if len(password) == 8 {
+			complete = true
+		}
+	}
+	fmt.Println("")
+	fmt.Println(password)
+}
+
+func partTwo(input string) {
+	fmt.Println("Cracking the Password, hold on to your butts: ")
+	rand.Seed(time.Now().UTC().UnixNano())
+	complete := false
+	idx := 1469580
+	password := []byte{0, 0, 0, 0, 0, 0, 0, 0}
+	printPassword(password)
+	fnd := 0
+	for !complete {
+		sum := fmt.Sprintf("%x", md5.Sum([]byte(input+itoa(idx))))
+		if strings.HasPrefix(sum, "00000") {
+			pos, err := strconv.Atoi(string(sum[5]))
+			if err == nil && pos < 8 && password[pos] == 0 {
+				password[pos] = sum[6]
+				fnd++
+				if fnd == 8 {
+					complete = true
+				}
+			}
+		}
+		if idx%100000 == 0 {
+			clearPassword()
+			printPassword(password)
+		}
+		idx++
+	}
+	clearPassword()
+	printPassword(password)
+	fmt.Println("")
+	fmt.Println("!~CRACK'D~!")
+}
+
+func clearPassword() {
+	fmt.Print("")
+}
+
+func printPassword(pw []byte) {
+	for i := 0; i < len(pw); i++ {
+		if pw[i] == 0 {
+			// Print random char
+			rndBt := byte(97 + rand.Intn(122-97))
+			if rndBt%3 == 0 {
+				fmt.Print(itoa(int(rndBt % 10)))
+			} else {
+				fmt.Print(string(byte(97 + rand.Intn(122-97))))
+			}
+		} else {
+			fmt.Print(string(pw[i]))
+		}
+	}
+}
+
+func stdinToString() string {
+	var input string
+	scanner := bufio.NewScanner(os.Stdin)
+	for scanner.Scan() {
+		input = input + scanner.Text()
+	}
+	return input
+}
+
+func itoa(i int) string {
+	return strconv.Itoa(i)
+}
+
+func atoi(i string) int {
+	var ret int
+	var err error
+	if ret, err = strconv.Atoi(i); err != nil {
+		log.Fatal("Invalid Atoi")
+	}
+	return ret
+}