diff --git a/builder/virtualbox/step_download_iso.go b/builder/virtualbox/step_download_iso.go
index f7491eab9..a0fadbf56 100644
--- a/builder/virtualbox/step_download_iso.go
+++ b/builder/virtualbox/step_download_iso.go
@@ -5,13 +5,9 @@ import (
 	"encoding/hex"
 	"fmt"
 	"github.com/mitchellh/multistep"
+	"github.com/mitchellh/packer/builder/common"
 	"github.com/mitchellh/packer/packer"
-	"io"
 	"log"
-	"net/http"
-	"net/url"
-	"os"
-	"strings"
 	"time"
 )
 
@@ -31,62 +27,52 @@ func (s stepDownloadISO) Run(state map[string]interface{}) multistep.StepAction
 	config := state["config"].(*config)
 	ui := state["ui"].(packer.Ui)
 
+	checksum, err := hex.DecodeString(config.ISOMD5)
+	if err != nil {
+		ui.Error(fmt.Sprintf("Error parsing checksum: %s", err))
+		return multistep.ActionHalt
+	}
+
 	log.Printf("Acquiring lock to download the ISO.")
 	cachePath := cache.Lock(config.ISOUrl)
 	defer cache.Unlock(config.ISOUrl)
 
-	err := s.checkMD5(cachePath, config.ISOMD5)
-	haveFile := err == nil
-	if err != nil {
-		if !os.IsNotExist(err) {
-			ui.Say(fmt.Sprintf("Error validating MD5 of ISO: %s", err))
-			return multistep.ActionHalt
-		}
+	downloadConfig := &common.DownloadConfig{
+		Url:        config.ISOUrl,
+		TargetPath: cachePath,
+		CopyFile:   false,
+		Hash:       md5.New(),
+		Checksum:   checksum,
 	}
 
-	if !haveFile {
-		url, err := url.Parse(config.ISOUrl)
-		if err != nil {
-			ui.Error(fmt.Sprintf("Error parsing iso_url: %s", err))
-			return multistep.ActionHalt
-		}
+	download := common.NewDownloadClient(downloadConfig)
 
-		// Start the download in a goroutine so that we cancel it and such.
-		var progress uint
-		downloadComplete := make(chan bool, 1)
-		go func() {
-			ui.Say("Copying or downloading ISO. Progress will be shown periodically.")
-			cachePath, err = s.downloadUrl(cachePath, url, &progress)
-			downloadComplete <- true
-		}()
+	downloadCompleteCh := make(chan error, 1)
+	go func() {
+		ui.Say("Copying or downloading ISO. Progress will be reported periodically.")
+		cachePath, err = download.Get()
+		downloadCompleteCh <- err
+	}()
 
-		progressTimer := time.NewTicker(15 * time.Second)
-		defer progressTimer.Stop()
+	progressTicker := time.NewTicker(5 * time.Second)
+	defer progressTicker.Stop()
 
-	DownloadWaitLoop:
-		for {
-			select {
-			case <-downloadComplete:
-				log.Println("Download of ISO completed.")
-				break DownloadWaitLoop
-			case <-progressTimer.C:
-				ui.Say(fmt.Sprintf("Download progress: %d%%", progress))
-			case <-time.After(1 * time.Second):
-				if _, ok := state[multistep.StateCancelled]; ok {
-					ui.Say("Interrupt received. Cancelling download...")
-					return multistep.ActionHalt
-				}
+DownloadWaitLoop:
+	for {
+		select {
+		case err := <-downloadCompleteCh:
+			if err != nil {
+				ui.Error(fmt.Sprintf("Error downloading ISO: %s", err))
 			}
-		}
 
-		if err != nil {
-			ui.Error(fmt.Sprintf("Error downloading ISO: %s", err))
-			return multistep.ActionHalt
-		}
-
-		if err = s.checkMD5(cachePath, config.ISOMD5); err != nil {
-			ui.Say(fmt.Sprintf("Error validating MD5 of ISO: %s", err))
-			return multistep.ActionHalt
+			break DownloadWaitLoop
+		case <-progressTicker.C:
+			ui.Say(fmt.Sprintf("Download progress: %d%%", download.PercentProgress()))
+		case <-time.After(1 * time.Second):
+			if _, ok := state[multistep.StateCancelled]; ok {
+				ui.Say("Interrupt received. Cancelling download...")
+				return multistep.ActionHalt
+			}
 		}
 	}
 
@@ -97,61 +83,3 @@ func (s stepDownloadISO) Run(state map[string]interface{}) multistep.StepAction
 }
 
 func (stepDownloadISO) Cleanup(map[string]interface{}) {}
-
-func (stepDownloadISO) checkMD5(path string, expected string) error {
-	f, err := os.Open(path)
-	if err != nil {
-		return err
-	}
-
-	hash := md5.New()
-	io.Copy(hash, f)
-	result := strings.ToLower(hex.EncodeToString(hash.Sum(nil)))
-	if result != expected {
-		return fmt.Errorf("result != expected: %s != %s", result, expected)
-	}
-
-	return nil
-}
-
-func (stepDownloadISO) downloadUrl(path string, url *url.URL, progress *uint) (string, error) {
-	if url.Scheme == "file" {
-		// If it is just a file URL, then we already have the ISO
-		return url.Path, nil
-	}
-
-	// Otherwise, it is an HTTP URL, and we must download it.
-	f, err := os.Create(path)
-	if err != nil {
-		return "", err
-	}
-	defer f.Close()
-
-	log.Printf("Beginning download of ISO: %s", url.String())
-	resp, err := http.Get(url.String())
-	if err != nil {
-		return "", err
-	}
-
-	var buffer [4096]byte
-	var totalRead int64
-	for {
-		n, err := resp.Body.Read(buffer[:])
-		if err != nil && err != io.EOF {
-			return "", err
-		}
-
-		totalRead += int64(n)
-		*progress = uint((float64(totalRead) / float64(resp.ContentLength)) * 100)
-
-		if _, werr := f.Write(buffer[:n]); werr != nil {
-			return "", werr
-		}
-
-		if err == io.EOF {
-			break
-		}
-	}
-
-	return path, nil
-}