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DeDRM ion: Clean out errorneous whitespace and UTF8 definition from python 2 times

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Martin Rys 2024-10-27 22:56:15 +01:00 committed by noDRM
parent 3373d93874
commit 195ea69537
1 changed files with 26 additions and 30 deletions
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56
DeDRM_plugin/ion.py
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@ -1,24 +1,17 @@
#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""ion.py: Decrypt Kindle KFX files.
# ion.py
# Copyright © 2013-2020 Apprentice Harper et al.
Revision history:
Pascal implementation by lulzkabulz.
BinaryIon.pas + DrmIon.pas + IonSymbols.pas
1.0 - Python translation by apprenticenaomi.
1.1 - DeDRM integration by anon.
1.2 - Added pylzma import fallback
1.3 - Fixed lzma support for calibre 4.6+
2.0 - VoucherEnvelope v2/v3 support by apprenticesakuya.
3.0 - Added Python 3 compatibility for calibre 5.0
__license__ = 'GPL v3'
__version__ = '3.0'
# Revision history:
# Pascal implementation by lulzkabulz.
# BinaryIon.pas + DrmIon.pas + IonSymbols.pas
# 1.0 - Python translation by apprenticenaomi.
# 1.1 - DeDRM integration by anon.
# 1.2 - Added pylzma import fallback
# 1.3 - Fixed lzma support for calibre 4.6+
# 2.0 - VoucherEnvelope v2/v3 support by apprenticesakuya.
# 3.0 - Added Python 3 compatibility for calibre 5.0
"""
Decrypt Kindle KFX files.
Copyright © 2013-2020 Apprentice Harper et al.
"""
import collections
@ -30,6 +23,9 @@ import struct
from io import BytesIO
__license__ = 'GPL v3'
__version__ = '3.0'
#@@CALIBRE_COMPAT_CODE@@
@ -1096,11 +1092,11 @@ def process_V9888(st):
ws.sbox(d0x6a0bf4d0,d0x6a0dab50,[1,2])
ws.sbox(d0x6a0ba4d0,d0x6a0dab50,[1,2])
ws.shuffle(repl)
ws.shuffle(repl)
ws.shuffle(repl)
ws.shuffle(repl)
ws.sbox(d0x6a0bf4d0,d0x6a0dab50,[1,2])
ws.sbox(d0x6a0ba4d0,d0x6a0dab50,[1,2])
ws.exlookup(d0x6a0be4d0)
ws.exlookup(d0x6a0be4d0)
dat=ws.mask(st[sto:sto+16])
out+=dat
sto+=16
@ -1124,7 +1120,7 @@ def process_V4648(st):
ws.sbox(d0x6a0c51a8,d0x6a0dab50,[1,3])
ws.shuffle(repl)
ws.shuffle(repl)
ws.exlookup(d0x6a0c91a8)
ws.exlookup(d0x6a0c91a8)
dat=ws.mask(st[sto:sto+16])
out+=dat
sto+=16
@ -1148,7 +1144,7 @@ def process_V5683(st):
ws.shuffle(repl)
ws.sbox(d0x6a0cfe80,d0x6a0dab50,[])
ws.shuffle(repl)
ws.exlookup(d0x6a0d3e80)
ws.exlookup(d0x6a0d3e80)
dat=ws.mask(st[sto:sto+16])
out+=dat
sto+=16
@ -1163,12 +1159,12 @@ def process_V5683(st):
# if a<0: a=256+a
# ax.append(ha[(a>>4)]+ha[a%16])
# return "".join(ax)
#
#
# def memhex(adr,sz):
# emu=EmulatorHelper(currentProgram)
# arr=emu.readMemory(getAddress(adr),sz)
# return a2hex(arr)
#
#
@ -1254,7 +1250,7 @@ def scramble3(st,magic):
iVar5 = iVar5 - magic
index -= 1
if uVar4<=-1: break
else:
else:
if (offset < magic):
iVar3 = 0
else :
@ -1274,9 +1270,9 @@ def scramble3(st,magic):
index=index-1
iVar5 = iVar5 + magic;
cntr += 1;
if iVar3>=divs: break
if iVar3>=divs: break
offset = offset + 1
if offset >= ((magic - 1) + divs) :break
if offset >= ((magic - 1) + divs) :break
return ret
#not sure if the third variant is used anywhere, but it is in Kindle, so I tried to add it
@ -1342,12 +1338,12 @@ class DrmIonVoucher(object):
_assert(False, "Unknown lock parameter: %s" % param)
# i know that version maps to scramble pretty much 1 to 1, but there was precendent where they changed it, so...
# i know that version maps to scramble pretty much 1 to 1, but there was precendent where they changed it, so...
sharedsecrets = [obfuscate(shared, self.version),obfuscate2(shared, self.version),obfuscate3(shared, self.version),
process_V9708(shared), process_V1031(shared), process_V2069(shared), process_V9041(shared),
process_V3646(shared), process_V6052(shared), process_V9479(shared), process_V9888(shared),
process_V4648(shared), process_V5683(shared)]
decrypted=False
ex=None
for sharedsecret in sharedsecrets:
@ -1361,7 +1357,7 @@ class DrmIonVoucher(object):
_assert(self.drmkey.hasnext() and self.drmkey.next() == TID_LIST and self.drmkey.gettypename() == "com.amazon.drm.KeySet@1.0",
"Expected KeySet, got %s" % self.drmkey.gettypename())
decrypted=True
decrypted=True
print("Decryption succeeded")
break