Go語言常見雜湊函數的使用_Golang

myhash.go

/** * Created with IntelliJ IDEA. * User: liaojie * Date: 12-9-8 * Time: 下午3:53 * To change this template use File | Settings | File Templates. */package mainimport (  "crypto/md5"  "crypto/sha1"  "crypto/sha256"  "crypto/sha512"  "flag" //命令列選項解析器  "fmt"  "hash"  "io"  "os")var style = flag.String("s", "sha256", "採用的哈西函數:sha1,sha256")var filename = flag.String("f", "", "需要計算散列值的檔案名稱")func main() {  flag.Parse()  var hs hash.Hash  switch *style {  case "md5":    hs = md5.New()  case "sha1":    hs = sha1.New()  case "sha512":    hs = sha512.New()  default:    hs = sha256.New()  }  if len(*filename) == 0 {    filein, err := os.Open(flag.Args()[len(flag.Args())-1])    if err != nil {      return    } else {      io.Copy(hs, filein)    }  } else {    filein, err := os.Open(*filename)    if err != nil {      return    } else {      io.Copy(hs, filein)    }  }  hashString := hs.Sum(nil)  fmt.Printf("%x\n", hashString)}

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