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DeDRM_tools
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Add useful error message for the new, uncracked ADEPT DRM

This commit is contained in:
NoDRM 2021-11-15 19:51:36 +01:00
parent 40a8e4360b
commit 88dd1350c0
3 changed files with 36 additions and 1 deletions
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14
DeDRM_plugin/__init__.py
View File

@ -373,6 +373,10 @@ class DeDRM(FileTypePlugin):
if result == 0:
print("{0} v{1}: Decrypted with key {2:s} after {3:.1f} seconds".format(PLUGIN_NAME, PLUGIN_VERSION,keyname,time.time()-self.starttime))
return self.checkFonts(of.name)
except ineptepub.ADEPTNewVersionError:
print("{0} v{1}: Book uses unsupported (too new) Adobe DRM.".format(PLUGIN_NAME, PLUGIN_VERSION, time.time()-self.starttime))
return path_to_ebook
except:
print("{0} v{1}: Exception when decrypting after {2:.1f} seconds - trying other keys".format(PLUGIN_NAME, PLUGIN_VERSION, time.time()-self.starttime))
traceback.print_exc()
@ -387,6 +391,9 @@ class DeDRM(FileTypePlugin):
# Give the user key, ebook and TemporaryPersistent file to the decryption function.
try:
result = ineptepub.decryptBook(userkey, inf.name, of.name)
except ineptepub.ADEPTNewVersionError:
print("{0} v{1}: Book uses unsupported (too new) Adobe DRM.".format(PLUGIN_NAME, PLUGIN_VERSION, time.time()-self.starttime))
return path_to_ebook
except:
print("{0} v{1}: Exception when decrypting after {2:.1f} seconds".format(PLUGIN_NAME, PLUGIN_VERSION, time.time()-self.starttime))
traceback.print_exc()
@ -521,6 +528,10 @@ class DeDRM(FileTypePlugin):
if result == 0:
print("{0} v{1}: Decrypted with key {2:s} after {3:.1f} seconds".format(PLUGIN_NAME, PLUGIN_VERSION,keyname,time.time()-self.starttime))
return of.name
except ineptpdf.ADEPTNewVersionError:
print("{0} v{1}: Book uses unsupported (too new) Adobe DRM.".format(PLUGIN_NAME, PLUGIN_VERSION, time.time()-self.starttime))
return path_to_ebook
except:
print("{0} v{1}: Exception when decrypting after {2:.1f} seconds - trying other keys".format(PLUGIN_NAME, PLUGIN_VERSION, time.time()-self.starttime))
traceback.print_exc()
@ -537,6 +548,9 @@ class DeDRM(FileTypePlugin):
# Give the user key, ebook and TemporaryPersistent file to the decryption function.
try:
result = ineptpdf.decryptBook(userkey, path_to_ebook, of.name)
except ineptpdf.ADEPTNewVersionError:
print("{0} v{1}: Book uses unsupported (too new) Adobe DRM.".format(PLUGIN_NAME, PLUGIN_VERSION, time.time()-self.starttime))
return path_to_ebook
except:
print("{0} v{1}: Exception when decrypting after {2:.1f} seconds".format(PLUGIN_NAME, PLUGIN_VERSION, time.time()-self.starttime))
traceback.print_exc()

9
DeDRM_plugin/ineptepub.py
View File

@ -110,6 +110,9 @@ def unicode_argv():
class ADEPTError(Exception):
pass
class ADEPTNewVersionError(Exception):
pass
def _load_crypto_libcrypto():
from ctypes import CDLL, POINTER, c_void_p, c_char_p, c_int, c_long, \
Structure, c_ulong, create_string_buffer, cast
@ -468,6 +471,12 @@ def decryptBook(userkey, inpath, outpath):
adept = lambda tag: '{%s}%s' % (NSMAP['adept'], tag)
expr = './/%s' % (adept('encryptedKey'),)
bookkey = ''.join(rights.findtext(expr))
if len(bookkey) == 192:
print("{0:s} seems to be an Adobe ADEPT ePub with Adobe's new DRM".format(os.path.basename(inpath)))
print("This DRM cannot be removed yet. ")
print("Try getting your distributor to give you a new ACSM file, then open that in an old version of ADE (2.0).")
print("If your book distributor is not enforcing the new DRM yet, this will give you a copy with the old DRM.")
raise ADEPTNewVersionError("Book uses new ADEPT encryption")
if len(bookkey) != 172:
print("{0:s} is not a secure Adobe Adept ePub.".format(os.path.basename(inpath)))
return 1

14
DeDRM_plugin/ineptpdf.py
View File

@ -125,6 +125,9 @@ def unicode_argv():
class ADEPTError(Exception):
pass
class ADEPTNewVersionError(Exception):
pass
import hashlib
@ -1615,7 +1618,16 @@ class PDFDocument(object):
rights = zlib.decompress(rights, -15)
rights = etree.fromstring(rights)
expr = './/{http://ns.adobe.com/adept}encryptedKey'
bookkey = codecs.decode(''.join(rights.findtext(expr)).encode('utf-8'),'base64')
bookkey = ''.join(rights.findtext(expr))
if len(bookkey) == 192:
print("This seems to be an Adobe ADEPT PDF with Adobe's new DRM")
print("This DRM cannot be removed yet. ")
print("Try getting your distributor to give you a new ACSM file, then open that in an old version of ADE (2.0).")
print("If your book distributor is not enforcing the new DRM yet, this will give you a copy with the old DRM.")
raise ADEPTNewVersionError("Book uses new ADEPT encryption")
bookkey = codecs.decode(bookkey.encode('utf-8'),'base64')
bookkey = rsa.decrypt(bookkey)
if len(bookkey) > 16: