ineptepub 4.1

Adobe_EPUB_Tools/ineptepub.pyw

@@ -1,6 +1,6 @@
 #! /usr/bin/python
 
-# ineptepub.pyw, version 4
+# ineptepub.pyw, version 4.1
 
 # To run this program install Python 2.6 from http://www.python.org/download/
 # and PyCrypto from http://www.voidspace.org.uk/python/modules.shtml#pycrypto
@@ -11,7 +11,8 @@
 #   1 - Initial release
 #   2 - Rename to INEPT, fix exit code
 #   3 - Add cmd or gui choosing
-#   4 - changed to adeptkey4.der format for 1.7.2 support (anon)
+#   4 - support for 1.7.2 support (anon)
+#   4.1 - backward compatibility for 1.7.1 and old adeptkey.der
 
 """
 Decrypt Adobe ADEPT-encrypted EPUB books.
@@ -32,7 +33,6 @@ import Tkinter
 import Tkconstants
 import tkFileDialog
 import tkMessageBox
-import pickle
 
 try:
     from Crypto.Cipher import AES
@@ -196,52 +196,35 @@ def cli_main(argv=sys.argv):
         print "usage: %s KEYFILE INBOOK OUTBOOK" % (progname,)
         return 1
     keypath, inpath, outpath = argv[1:]
-    with open(keypath, 'r') as f:
-        keyderlist = pickle.load(f)
-    keynotfound = 1
-    for keyder in keyderlist:
-        key = ASN1Parser([ord(x) for x in keyder])
-        key = [bytesToNumber(key.getChild(x).value) for x in xrange(1, 4)]
-        try:
-            rsa = RSA.construct(key)
-        except Exception:
-            keynotfound = 1
-            continue
-        with closing(ZipFile(open(inpath, 'rb'))) as inf:
-            namelist = set(inf.namelist())
-            if 'META-INF/rights.xml' not in namelist or \
-               'META-INF/encryption.xml' not in namelist:
-                raise ADEPTError('%s: not an ADEPT EPUB' % (inpath,))
-            for name in META_NAMES:
-                namelist.remove(name)
-            rights = etree.fromstring(inf.read('META-INF/rights.xml'))
-            adept = lambda tag: '{%s}%s' % (NSMAP['adept'], tag)
-            expr = './/%s' % (adept('encryptedKey'),)
-            bookkey = ''.join(rights.findtext(expr))
-            try:
-                bookkey = rsa.decrypt(bookkey.decode('base64'))
-            except Exception:
-                keynotfound = 1
-                continue
-            # Padded as per RSAES-PKCS1-v1_5
-            if bookkey[-17] != '\x00':
-                keynotfound = 1
-                inf.close()
-                continue
-            else:
-                keynotfound = 0
-            encryption = inf.read('META-INF/encryption.xml')
-            decryptor = Decryptor(bookkey[-16:], encryption)
-            kwds = dict(compression=ZIP_DEFLATED, allowZip64=False)
-            with closing(ZipFile(open(outpath, 'wb'), 'w', **kwds)) as outf:
-                zi = ZipInfo('mimetype', compress_type=ZIP_STORED)
-                outf.writestr(zi, inf.read('mimetype'))
-                for path in namelist:
-                    data = inf.read(path)
-                    outf.writestr(path, decryptor.decrypt(path, data))
-        break
-    if keynotfound == 1:
-        raise ADEPTError('problem decrypting session key')
+    with open(keypath, 'rb') as f:
+        keyder = f.read()
+    key = ASN1Parser([ord(x) for x in keyder])
+    key = [bytesToNumber(key.getChild(x).value) for x in xrange(1, 4)]
+    rsa = RSA.construct(key)
+    with closing(ZipFile(open(inpath, 'rb'))) as inf:
+        namelist = set(inf.namelist())
+        if 'META-INF/rights.xml' not in namelist or \
+           'META-INF/encryption.xml' not in namelist:
+            raise ADEPTError('%s: not an ADEPT EPUB' % (inpath,))
+        for name in META_NAMES:
+            namelist.remove(name)
+        rights = etree.fromstring(inf.read('META-INF/rights.xml'))
+        adept = lambda tag: '{%s}%s' % (NSMAP['adept'], tag)
+        expr = './/%s' % (adept('encryptedKey'),)
+        bookkey = ''.join(rights.findtext(expr))
+        bookkey = rsa.decrypt(bookkey.decode('base64'))
+        # Padded as per RSAES-PKCS1-v1_5
+        if bookkey[-17] != '\x00':
+            raise ADEPTError('problem decrypting session key')
+        encryption = inf.read('META-INF/encryption.xml')
+        decryptor = Decryptor(bookkey[-16:], encryption)
+        kwds = dict(compression=ZIP_DEFLATED, allowZip64=False)
+        with closing(ZipFile(open(outpath, 'wb'), 'w', **kwds)) as outf:
+            zi = ZipInfo('mimetype', compress_type=ZIP_STORED)
+            outf.writestr(zi, inf.read('mimetype'))
+            for path in namelist:
+                data = inf.read(path)
+                outf.writestr(path, decryptor.decrypt(path, data))
     return 0
 
 
@@ -257,8 +240,8 @@ class DecryptionDialog(Tkinter.Frame):
         Tkinter.Label(body, text='Key file').grid(row=0)
         self.keypath = Tkinter.Entry(body, width=30)
         self.keypath.grid(row=0, column=1, sticky=sticky)
-        if os.path.exists('adeptkey4.der'):
-            self.keypath.insert(0, 'adeptkey4.der')
+        if os.path.exists('adeptkey.der'):
+            self.keypath.insert(0, 'adeptkey.der')
         button = Tkinter.Button(body, text="...", command=self.get_keypath)
         button.grid(row=0, column=2)
         Tkinter.Label(body, text='Input file').grid(row=1)