golang中md5生成

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package main   import (     "crypto/md5"     "fmt"     "io" )   // golang md5加密 func main()  {     h := md5.New()     // 签名     sign := "wasdhasdhjasduh"       // 生成md5码写法1     io.WriteString(h, sign)     sum := fmt.Sprintf("%x", h.Sum(nil))     fmt.Println("sum:", sum)         // 生成md5码写法2     data := []byte("wasdhasdhjasduh")     sum = fmt.Sprintf("%x\n", md5.Sum(data))     fmt.Println("sum:", sum)       //sum: f4879827716b8ce02a04708ba09a04a6     //sum: f4879827716b8ce02a04708ba09a04a6   }