Golang-加密程序的包函数“ Available（）”未定义

Question

It might be a very basic and stupid question, but I'm stuck. As I understood from the documentation, the Available() function should return true if the given hash function was imported. So, this code:

package main

import (
    "crypto/md5"
    "fmt"
)

func main() {
    fmt.Println(md5.Available())
}

Should produce true as an output. However, I get the "./main.go:10: undefined: md5.Available" error when trying to run code above. What am I missing? Thanks in advance.

Answer 1

The md5 youre using is package's identifier, what you need is "instance" of type Hash:

import (
    "crypto"
    "fmt"
)

func main() {
    fmt.Println(crypto.MD5.Available())
}

output:

false