Find hex keywords in MD5 hashes

main.go

package main

import (
	"bytes"
	"crypto/md5"
	"fmt"
	"math"
)

var symbols = []byte{
	'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's',
	't', 'u', 'v', 'w', 'x', 'y', 'z', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L',
	'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', '0', '1', '2', '3', '4',
	'5', '6', '7', '8', '9', '!', '$', '%', '^', '&', '*', '(', ')', '-', '_', '+', '=', '{', '}',
	';', ':', '@', '~', '#', '<', ',', '>', '.', '?', '/', '|', '`', ' ',
}

var check_strings = [][]byte{
	[]byte("deadbeef"),
}

func main() {
	fmt.Printf("Checking for: %s\n", bytes.Join(check_strings, []byte(", ")))

	hash := md5.New()
	var sum_buf bytes.Buffer

	for depth := 1; ; depth++ {
		buf := make([]byte, depth)
		for i := 0; i < int(math.Pow(float64(len(symbols)), float64(depth))); i++ {
			for j := 0; j < depth; j++ {
				sym := (i / int(math.Pow(float64(len(symbols)), float64(j)))) % len(symbols)
				buf[j] = symbols[sym]
			}

			hash.Write(buf)
			fmt.Fprintf(&sum_buf, "%x", hash.Sum(nil))
			for _, str := range check_strings {
				if bytes.Contains(sum_buf.Bytes(), str) {
					fmt.Printf("%s => %s\n", buf, sum_buf.Bytes())
				}
			}
			sum_buf.Reset()
		}

		fmt.Printf("Upping depth to %d.\n", depth + 1)
	}
}