crc32 encoding and decoding example / bilibili uid hash

crc32calc.go

func main() {
	// IEEE is crc32b, which is used to hash bilibili uid
	// Encode
	uid := "21670130"
	h := fmt.Sprintf("%x", crc32.ChecksumIEEE([]byte(uid)))
    fmt.Printf("Encoding of %s: %s\n", uid, h)
	// Decode
	hashed := "6acc8733"
	fmt.Printf("Start Decoding... \n")
	for i := 1; i < 500000000; i++ {
		h = fmt.Sprintf("%x", crc32.ChecksumIEEE([]byte(strconv.Itoa(i))))
		if fmt.Sprintf("%s", h) == hashed {
			fmt.Printf("\rProgress: Completed\n")
			fmt.Printf("Decoding of %s: %d \n", hashed, i)
		}
		if i%50000 == 0 {
			fmt.Printf("\rProgress: %5.2f%%", float64(i)*100 / float64(500000000))
		}
	}
}