Go提供了MD5、SHA-1等几个哈希函数：

package main

import (
	"crypto/md5"
	"crypto/sha1"
	"fmt"
)

func main() {
	TestString := "Hi, Redseanet!"

	Md5Inst := md5.New()
	Md5Inst.Write([]byte(TestString))
	Result := Md5Inst.Sum([]byte(""))
	fmt.Printf("%x\n\n", Result)

	ShalInst := sha1.New()
	ShalInst.Write([]byte(TestString))
	Result = ShalInst.Sum([]byte(""))
	fmt.Printf("%x\n\n", Result)
}

输出结果:

% go run sha.go
082b191da34b7f5f16ac8ae05392a08d

9da394c08c70074712e53f3836bc6bc0a7a82818

对文件内容计算SHA1:

package main
 
import (
	"crypto/md5"
	"crypto/sha1"
	"fmt"
	"io"
	"os"
)
 
func main() {
	TestFile := "123.txt"
	infile, inerr := os.Open(TestFile)
	if inerr == nil {
		md5h := md5.New()
		io.Copy(md5h, infile)
		fmt.Printf("%x %s\n", md5h.Sum([]byte("")), TestFile)
		sha1h := sha1.New()
		io.Copy(sha1h, infile)
		fmt.Printf("%x %s\n", sha1h.Sum([]byte("")), TestFile)
	} else {
		fmt.Println(inerr)
		os.Exit(1)
	}
}