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Add B&N PDF DeDRM (untested), match UUID for Adobe PDFs

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NoDRM
2021-11-16 11:48:53 +01:00
parent b4c0e33b8b
commit 9c41716e5e
3 changed files with 95 additions and 12 deletions
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68
DeDRM_plugin/ineptpdf.py
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@@ -1488,7 +1488,7 @@ class PDFDocument(object):
# Perform the initialization with a given password.
# This step is mandatory even if there's no password associated
# with the document.
def initialize(self, password=b''):
def initialize(self, password=b'', inept=True):
if not self.encryption:
self.is_printable = self.is_modifiable = self.is_extractable = True
self.ready = True
@@ -1500,8 +1500,11 @@ class PDFDocument(object):
return self.initialize_adobe_ps(password, docid, param)
if type == 'Standard':
return self.initialize_standard(password, docid, param)
if type == 'EBX_HANDLER':
return self.initialize_ebx(password, docid, param)
if type == 'EBX_HANDLER' and inept is True:
return self.initialize_ebx_inept(password, docid, param)
if type == 'EBX_HANDLER' and inept is False:
return self.initialize_ebx_ignoble(password, docid, param)
raise PDFEncryptionError('Unknown filter: param=%r' % param)
def initialize_adobe_ps(self, password, docid, param):
@@ -1642,7 +1645,52 @@ class PDFDocument(object):
return True
def initialize_ebx(self, password, docid, param):
def initialize_ebx_ignoble(self, keyb64, docid, param):
self.is_printable = self.is_modifiable = self.is_extractable = True
key = keyb64.decode('base64')[:16]
aes = AES.new(key,AES.MODE_CBC,"\x00" * len(key))
length = int_value(param.get('Length', 0)) / 8
rights = str_value(param.get('ADEPT_LICENSE')).decode('base64')
rights = zlib.decompress(rights, -15)
rights = etree.fromstring(rights)
expr = './/{http://ns.adobe.com/adept}encryptedKey'
bookkey = ''.join(rights.findtext(expr)).decode('base64')
bookkey = aes.decrypt(bookkey)
bookkey = bookkey[:-ord(bookkey[-1])]
bookkey = bookkey[-16:]
ebx_V = int_value(param.get('V', 4))
ebx_type = int_value(param.get('EBX_ENCRYPTIONTYPE', 6))
# added because of improper booktype / decryption book session key errors
if length > 0:
if len(bookkey) == length:
if ebx_V == 3:
V = 3
else:
V = 2
elif len(bookkey) == length + 1:
V = bookkey[0]
bookkey = bookkey[1:]
else:
print("ebx_V is %d and ebx_type is %d" % (ebx_V, ebx_type))
print("length is %d and len(bookkey) is %d" % (length, len(bookkey)))
print("bookkey[0] is %d" % bookkey[0])
raise ADEPTError('error decrypting book session key - mismatched length')
else:
# proper length unknown try with whatever you have
print("ebx_V is %d and ebx_type is %d" % (ebx_V, ebx_type))
print("length is %d and len(bookkey) is %d" % (length, len(bookkey)))
print("bookkey[0] is %d" % ord(bookkey[0]))
if ebx_V == 3:
V = 3
else:
V = 2
self.decrypt_key = bookkey
self.genkey = self.genkey_v3 if V == 3 else self.genkey_v2
self.decipher = self.decrypt_rc4
self.ready = True
return
def initialize_ebx_inept(self, password, docid, param):
self.is_printable = self.is_modifiable = self.is_extractable = True
rsa = RSA(password)
length = int_value(param.get('Length', 0)) // 8
@@ -2042,15 +2090,19 @@ class PDFObjStrmParser(PDFParser):
def adeptGetUserUUID(inf):
try:
doc = PDFDocument()
inf = open(inf, 'rb')
pars = PDFParser(doc, inf)
(docid, param) = doc.encryption
type = literal_name(param['Filter'])
if type != 'EBX_HANDLER':
# No EBX_HANDLER, no idea which user key can decrypt this.
inf.close()
return None
rights = codecs.decode(param.get('ADEPT_LICENSE'), 'base64')
inf.close()
rights = zlib.decompress(rights, -15)
rights = etree.fromstring(rights)
expr = './/{http://ns.adobe.com/adept}user'
@@ -2066,14 +2118,14 @@ def adeptGetUserUUID(inf):
### My own code, for which there is none else to blame
class PDFSerializer(object):
def __init__(self, inf, userkey):
def __init__(self, inf, userkey, inept=True):
global GEN_XREF_STM, gen_xref_stm
gen_xref_stm = GEN_XREF_STM > 1
self.version = inf.read(8)
inf.seek(0)
self.doc = doc = PDFDocument()
parser = PDFParser(doc, inf)
doc.initialize(userkey)
doc.initialize(userkey, inept)
self.objids = objids = set()
for xref in reversed(doc.xrefs):
trailer = xref.trailer
@@ -2263,11 +2315,11 @@ class PDFSerializer(object):
def decryptBook(userkey, inpath, outpath):
def decryptBook(userkey, inpath, outpath, inept=True):
if RSA is None:
raise ADEPTError("PyCryptodome or OpenSSL must be installed.")
with open(inpath, 'rb') as inf:
serializer = PDFSerializer(inf, userkey)
serializer = PDFSerializer(inf, userkey, inept)
with open(outpath, 'wb') as outf:
# help construct to make sure the method runs to the end
try: