golang 產生android 簽名檔案

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package mainimport (    "strings"    "log"    "os"    "archive/zip"    "crypto/sha1"    "io"    "path"    "encoding/base64")func Sha1File(f string) error {    sha1h := sha1.New()    file, err:= os.Open(f)    if err != nil{        return err    }    defer file.Close()    if _, err = io.Copy(sha1h,file);err!=nil{        return err    }    log.Println("sha1:", base64.StdEncoding.EncodeToString(sha1h.Sum(nil)))    return nil}func GenerateApkSignFile(apk_file, dic string) (err error){    var reader *zip.ReadCloser    if reader, err = zip.OpenReader(apk_file); err != nil{        return    }    defer reader.Close()    if err = os.MkdirAll(dic, 0755); err != nil{        return    }    manifest_mf := path.Join(dic, "MANIFEST.MF")    cert_sf := path.Join(dic, "CERT.SF")    mm_header := "Manifest-Version: 1.0\nBuilt-By: Generated-by-ADT\nCreated-By: Android Gradle 2.2.2\n\n"    mm_sha1 := sha1.New()    var mm_file *os.File    var cf_file *os.File    if mm_file, err = os.Create(manifest_mf); err != nil{        return    }    if cf_file, err = os.Create(cert_sf); err != nil{        return    }    defer cf_file.Close()    mm_file.Write([]byte(mm_header))    mm_sha1.Write([]byte(mm_header))    for _, file := range reader.File {        if strings.HasPrefix(file.Name, "META-INF"){            continue        }        if strings.HasSuffix(file.Name, "/"){            continue        }        file_name := "Name: "+file.Name        if len(file_name) <= 70{            mm_file.Write([]byte(file_name+"\n"))            mm_sha1.Write([]byte(file_name+"\n"))        }else{            mm_file.Write([]byte(file_name[0:70]+"\n"))            mm_sha1.Write([]byte(file_name[0:70]+"\n"))            mm_file.Write([]byte(" "+file_name[70:]+"\n"))            mm_sha1.Write([]byte(" "+file_name[70:]+"\n"))        }        if rc, e := file.Open(); e != nil{            err = e            return        }else{            sha1h := sha1.New()            if _, err = io.Copy(sha1h,rc);err!=nil{                return            }            sha1_data := base64.StdEncoding.EncodeToString(sha1h.Sum(nil))            mm_file.Write([]byte("SHA1-Digest: "+sha1_data+"\n\n"))            mm_sha1.Write([]byte("SHA1-Digest: "+sha1_data+"\n\n"))            rc.Close()        }    }    mm_file.Close()    mm_file, err = os.Open(manifest_mf)    mm_file.Seek(int64(len(mm_header)), os.SEEK_SET)    cf_header := "Signature-Version: 1.0\nX-Android-APK-Signed: 2\nSHA1-Digest-Manifest: "+base64.StdEncoding.EncodeToString(mm_sha1.Sum(nil))+"\nCreated-By: 1.0 (Android)\n\n"    cf_file.Write([]byte(cf_header))    io.Copy(cf_file, mm_file)    mm_file.Close()    return}func main() {    err := GenerateApkSignFile(`C:\Users\Donggui\Documents\encrypted.apk`, `C:\Users\Donggui\Desktop\`)    if err != nil{        log.Println(err)    }}