详解Go hash算法的支持

package main

import (
  "crypto/sha1"
  "fmt"
  "io"
  "log"
  "os"
)

func main() {
  data := []byte("this is test, hello world, keep coding")
  fmt.Printf("%x \n", sha1.Sum(data))

  h := sha1.New()
  io.WriteString(h, "this is test, hello world, keep coding")
  fmt.Printf("%x \n", h.Sum(nil))

  fmt.Printf("%x \n", shaFile("./file.txt"))
}

//shaFile利用sha1算法将目标文件生成哈希值
func shaFile(filePath string) []byte {
  f, err := os.Open("file.txt")
  if err != nil {
    log.Fatal(err)
  }
  defer f.Close()

  h := sha1.New()
  if _, err := io.Copy(h, f); err != nil {
    log.Fatal(err)
  }
  return h.Sum(nil)
}

package main

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

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

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

  Sha1Inst := sha1.New()
  Sha1Inst.Write([]byte(TestString))
  Result = Sha1Inst.Sum([]byte(""))
  fmt.Printf("%x\n\n", Result)
}