Drophash in Python

First little Python project, a little utility to take the MD5 and SHA hashes of a bunch of files dragged and dropped onto it. Same function as but better presentation that a Win32 version (on the Windows page) I wrote back in late '00 (and which I have still been making regular use of for checking MD5s of file downloads).

WxPython UI

This one is neater than the Win32 version since I can use the nifty HTML window widget and place the results for each new batch of files in a table, with the files and hashes cross-indexed. Simply cut, paste and save the text of the section below as drophash.py.

#!/usr/bin/env python
# -*- coding: ISO-8859-1 -*-

#MD5 test suite:
#MD5 ("") = d41d8cd98f00b204e9800998ecf8427e
#MD5 ("a") = 0cc175b9c0f1b6a831c399e269772661
#MD5 ("abc") = 900150983cd24fb0d6963f7d28e17f72
#MD5 ("message digest") = f96b697d7cb7938d525a2f31aaf161d0
#MD5 ("abcdefghijklmnopqrstuvwxyz") = c3fcd3d76192e4007dfb496cca67e13b
#MD5 ("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789") = d174ab98d277d9f5a5611c2c9f419d9f
#MD5 ("12345678901234567890123456789012345678901234567890123456789012345678901234567890") = 57edf4a22be3c955ac49da2e2107b67a

#SHA test suite:
#SHA ("abc") = A9993E36 4706816A BA3E2571 7850C26C 9CD0D89D
#SHA ("abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq") = 84983E44 1C3BD26E BAAE4AA1 F95129E5 E54670F1
#SHA (A million repetitions of "a") = 34AA973C D4C4DAA4 F61EEB2B DBAD2731 6534016F


import wx
import wx.html as html
from md5 import *
from sha import *

def getHash(file, hashOp, delimiter) :

    try :
        reader = open(file, 'rb')
    except :
        return ""
    
    try :
        digest = hashOp()
        while True :
            chunk = reader.read(1024)
            if not chunk :
                break
            digest.update(chunk)
    finally:
        reader.close()
        
    raw = digest.hexdigest()
    work = []
    i = 0
    while i < len(raw) :
        work.append(raw[i])
        i += 1
        if 0 == (i%8) :
            work = work + delimiter

    return ''.join(work)

class FileDropTarget(wx.FileDropTarget):
    def __init__(self, window):
        wx.FileDropTarget.__init__(self)
        self.window = window

    hashes = (md5, sha)
    nbsp = list(" ")

    def OnDropFiles(self, x, y, filenames) :
        self.window.AppendToPage("<table border=1><tr><th>File</th><th>MD5</th><th>SHA-1</th></tr>")
        for file in filenames :
            self.window.AppendToPage("<tr><td>%s</td>" % file)

            for hashOp in self.hashes :
                anHash = getHash(file, hashOp, self.nbsp)
                self.window.AppendToPage("<td><pre>%s</pre></td>" % anHash)

            self.window.AppendToPage("</tr>")
        self.window.AppendToPage("</table>")

def decorate(frame):
    frame.SetTitle("wxPython - Drophash")
    ## optionally, an icon
    ## _icon = wx.EmptyIcon()
    ## _icon.CopyFromBitmap(wx.Bitmap("drophash.ico", wx.BITMAP_TYPE_ANY))
    ## frame.SetIcon(_icon)
    frame.style = wx.DEFAULT_FRAME_STYLE
    pane = html.HtmlWindow(frame, -1)
    dt = FileDropTarget(pane)
    pane.SetDropTarget(dt)


if __name__ == "__main__":
    theApp = wx.App(False)
    frame  = wx.Frame(None, -1)
    decorate(frame)
    theApp.SetTopWindow(frame)
    frame.Show()
    theApp.MainLoop()

Python + Tk UI

As an alternative, a pure Tk version. Not so fancy; you have to select the files you want (or put them on the command line). Just extract this section as tkhash.py and double click…

#!/usr/bin/env python
# -*- coding: ISO-8859-1 -*-

#MD5 test suite:
#MD5 ("") = d41d8cd98f00b204e9800998ecf8427e
#MD5 ("a") = 0cc175b9c0f1b6a831c399e269772661
#MD5 ("abc") = 900150983cd24fb0d6963f7d28e17f72
#MD5 ("message digest") = f96b697d7cb7938d525a2f31aaf161d0
#MD5 ("abcdefghijklmnopqrstuvwxyz") = c3fcd3d76192e4007dfb496cca67e13b
#MD5 ("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789") = d174ab98d277d9f5a5611c2c9f419d9f
#MD5 ("12345678901234567890123456789012345678901234567890123456789012345678901234567890") = 57edf4a22be3c955ac49da2e2107b67a

#SHA test suite:
#SHA ("abc") = A9993E36 4706816A BA3E2571 7850C26C 9CD0D89D
#SHA ("abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq") = 84983E44 1C3BD26E BAAE4AA1 F95129E5 E54670F1
#SHA (A million repetitions of "a") = 34AA973C D4C4DAA4 F61EEB2B DBAD2731 6534016F

import Tkinter
import ScrolledText
import tkFileDialog
import sys
import tkFont

from md5 import *
from sha import *

hashes = {"MD5" : md5, "SHA" : sha}
nbsp = list(" ")

def getHash(file, hashOp, delimiter) :

    try :
        reader = open(file, 'rb')
    except :
        return ""
    
    try :
        digest = hashOp()
        while True :
            chunk = reader.read(1024)
            if not chunk :
                break
            digest.update(chunk)
    finally:
        reader.close()
        
    raw = digest.hexdigest()
    work = []
    i = 0
    while i < len(raw) :
        work.append(raw[i])
        i += 1
        if 0 == (i%8) :
            work = work + delimiter

    return ''.join(work)


def doGetHashes() :
  filenames = tkFileDialog.askopenfilenames()
  updateCanvas(filenames)
  
def updateCanvas(filenames):
  textarea.config(state=Tkinter.NORMAL)
  for file in filenames :
    textarea.insert(Tkinter.END, ("%s\n" % file))

    for hashOp in hashes :
      anHash = getHash(file, hashes[hashOp], nbsp)
      textarea.insert(Tkinter.END, ("%s " % hashOp) )

      textarea.insert(Tkinter.END, ("%s\n" % anHash), 'mono' )

    textarea.insert(Tkinter.END, "-------------------------\n")
  textarea.tag_config('mono', font='courier')
  textarea.config(state=Tkinter.DISABLED)

if __name__ == "__main__":
  root = Tkinter.Tk()
  root.title("tkFileHasher")

  textarea = ScrolledText.ScrolledText()
  textarea.pack()
  textarea.config(state=Tkinter.DISABLED)
  Tkinter.Button(text="Select files to hash...", command=doGetHashes).pack()
  updateCanvas(sys.argv[1:])
  Tkinter.mainloop()