Go-SHA1

SHA1签名。

package main

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

/*
Get the sha1 of file's content.

If success, return the sha1 hex string.
If fail, return "".
*/
func GetFileSHA1(filename string) (sum string, success bool) {
    success = false

    data, err := ioutil.ReadFile(filename)
    if err != nil {
        fmt.Println("Sha1 sum error: ", err)
        return
    }

    success = true

    b := sha1.Sum(data)
    sum = fmt.Sprintf("%X", b)

    return
}

func main() {
    temp_file_name := "xyzabcdefghijklmnxyz.xyz"
    content := []byte("Hello, Go Programming Language!")

    err := ioutil.WriteFile(temp_file_name, content, 0666)
    if err != nil {
        fmt.Println(err)
        return
    }

    sha1_sum, success := GetFileSHA1(temp_file_name)
    if success {
        //C6ADC2F32EF2455EE0A7F66A874431B20043384F
        fmt.Println(sha1_sum)
    } else {
        fmt.Println("Failed to calculate sha1 sum.")
    }

    os.Remove(temp_file_name)
}