golang文件转哈希

package main

import (
    "crypto/md5"
    "fmt"
    "io"
    "os"
)

func main() {
    file, err := os.Open("testfile.txt")
    if err != nil {
        panic(err)
    }
    defer file.Close()

    h := md5.New()
    if _, err := io.Copy(h, file); err != nil {
        panic(err)
    }

    fmt.Printf("MD5 Hash: %x", h.Sum(nil))
}

h := sha256.New()
if _, err := io.Copy(h, file); err != nil {
    panic(err)
}

fmt.Printf("SHA256 Hash: %x", h.Sum(nil))

package main

import (
    "crypto/md5"
    "fmt"
    "io"
    "os"
    "path/filepath"
)

func main() {
    root := "."
    err := filepath.Walk(root, func(path string, info os.FileInfo, err error) error {
        if err != nil {
            return err
        }

        if !info.Mode().IsRegular() {
            return nil
        }

        file, err := os.Open(path)
        if err != nil {
            return err
        }
        defer file.Close()

        h := md5.New()
        if _, err := io.Copy(h, file); err != nil {
            return err
        }

        fmt.Printf("%x  %s
", h.Sum(nil), path)
        return nil
    })
    if err != nil {
        panic(err)
    }
}