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1. download ubuntu-14.04.2-desktop-amd64.iso by

torrent 'magnet:?xt=urn:btih:KRWPCX3SJUM4IMM4YF5RPHL6ANPYTQPU'

1. install rhash

rhash --btih ubuntu-14.04.2-desktop-amd64.iso
3b94daf4aeaae3f4a930b4466cb8af81d44bb305  ubuntu-14.04.2-desktop-amd64.iso

1. run this script

package main

import (
    "github.com/anacrolix/torrent/metainfo"
    "fmt"
    "path/filepath"
    "github.com/anacrolix/torrent/bencode"
)

func main() {
    filename:="ubuntu-14.04.2-desktop-amd64.iso"
    d:=makeMagnet("/home/sjtu-lyj/dht/server_data",filename)
    fmt.Println(d)
}

func makeMagnet(  dir string, name string) string {
    mi := metainfo.MetaInfo{}
    mi.SetDefaults()
    info := metainfo.Info{PieceLength: 1024*1024} 
    info.BuildFromFilePath(filepath.Join(dir, name))
    mi.InfoBytes, _ = bencode.Marshal(info)
    magnet := mi.Magnet(name, mi.HashInfoBytes()).String()
    return magnet
}
// magnet:?xt=urn:btih:3b94daf4aeaae3f4a930b4466cb8af81d44bb305&dn=ubuntu-14.04.2-desktop-amd64.iso