The common use of hash functions in the Go language
- 2020-05-27 05:55:22
- OfStack
myhash.go
/**
* Created with IntelliJ IDEA.
* User: liaojie
* Date: 12-9-8
* Time: In the afternoon 3:53
* To change this template use File | Settings | File Templates.
*/
package main
import (
"crypto/md5"
"crypto/sha1"
"crypto/sha256"
"crypto/sha512"
"flag" // Command line options parser
"fmt"
"hash"
"io"
"os"
)
var style = flag.String("s", "sha256", " Using the hash function :sha1,sha256")
var filename = flag.String("f", "", " The file name for which the hash value needs to be computed ")
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)
}
That's all for this article, I hope you enjoy it.