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https://github.com/noDRM/DeDRM_tools
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DeDRM ion: Clean out errorneous whitespace and UTF8 definition from python 2 times
This commit is contained in:
Martin Rys
noDRM
parent
3373d93874
commit
195ea69537
1 changed files with 26 additions and 30 deletions
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@ -1,24 +1,17 @@
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#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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"""ion.py: Decrypt Kindle KFX files.
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# ion.py
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# Copyright © 2013-2020 Apprentice Harper et al.
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Revision history:
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Pascal implementation by lulzkabulz.
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BinaryIon.pas + DrmIon.pas + IonSymbols.pas
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1.0 - Python translation by apprenticenaomi.
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1.1 - DeDRM integration by anon.
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1.2 - Added pylzma import fallback
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1.3 - Fixed lzma support for calibre 4.6+
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2.0 - VoucherEnvelope v2/v3 support by apprenticesakuya.
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3.0 - Added Python 3 compatibility for calibre 5.0
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__license__ = 'GPL v3'
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__version__ = '3.0'
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# Revision history:
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# Pascal implementation by lulzkabulz.
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# BinaryIon.pas + DrmIon.pas + IonSymbols.pas
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# 1.0 - Python translation by apprenticenaomi.
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# 1.1 - DeDRM integration by anon.
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# 1.2 - Added pylzma import fallback
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# 1.3 - Fixed lzma support for calibre 4.6+
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# 2.0 - VoucherEnvelope v2/v3 support by apprenticesakuya.
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# 3.0 - Added Python 3 compatibility for calibre 5.0
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"""
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Decrypt Kindle KFX files.
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Copyright © 2013-2020 Apprentice Harper et al.
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"""
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import collections
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@ -30,6 +23,9 @@ import struct
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from io import BytesIO
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__license__ = 'GPL v3'
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__version__ = '3.0'
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#@@CALIBRE_COMPAT_CODE@@
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@ -1096,11 +1092,11 @@ def process_V9888(st):
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ws.sbox(d0x6a0bf4d0,d0x6a0dab50,[1,2])
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ws.sbox(d0x6a0ba4d0,d0x6a0dab50,[1,2])
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ws.shuffle(repl)
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ws.shuffle(repl)
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ws.shuffle(repl)
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ws.shuffle(repl)
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ws.sbox(d0x6a0bf4d0,d0x6a0dab50,[1,2])
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ws.sbox(d0x6a0ba4d0,d0x6a0dab50,[1,2])
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ws.exlookup(d0x6a0be4d0)
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ws.exlookup(d0x6a0be4d0)
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dat=ws.mask(st[sto:sto+16])
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out+=dat
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sto+=16
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@ -1124,7 +1120,7 @@ def process_V4648(st):
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ws.sbox(d0x6a0c51a8,d0x6a0dab50,[1,3])
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ws.shuffle(repl)
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ws.shuffle(repl)
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ws.exlookup(d0x6a0c91a8)
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ws.exlookup(d0x6a0c91a8)
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dat=ws.mask(st[sto:sto+16])
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out+=dat
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sto+=16
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@ -1148,7 +1144,7 @@ def process_V5683(st):
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ws.shuffle(repl)
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ws.sbox(d0x6a0cfe80,d0x6a0dab50,[])
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ws.shuffle(repl)
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ws.exlookup(d0x6a0d3e80)
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ws.exlookup(d0x6a0d3e80)
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dat=ws.mask(st[sto:sto+16])
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out+=dat
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sto+=16
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@ -1163,12 +1159,12 @@ def process_V5683(st):
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# if a<0: a=256+a
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# ax.append(ha[(a>>4)]+ha[a%16])
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# return "".join(ax)
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#
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#
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# def memhex(adr,sz):
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# emu=EmulatorHelper(currentProgram)
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# arr=emu.readMemory(getAddress(adr),sz)
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# return a2hex(arr)
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#
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#
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@ -1254,7 +1250,7 @@ def scramble3(st,magic):
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iVar5 = iVar5 - magic
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index -= 1
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if uVar4<=-1: break
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else:
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else:
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if (offset < magic):
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iVar3 = 0
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else :
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@ -1274,9 +1270,9 @@ def scramble3(st,magic):
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index=index-1
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iVar5 = iVar5 + magic;
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cntr += 1;
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if iVar3>=divs: break
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if iVar3>=divs: break
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offset = offset + 1
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if offset >= ((magic - 1) + divs) :break
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if offset >= ((magic - 1) + divs) :break
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return ret
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#not sure if the third variant is used anywhere, but it is in Kindle, so I tried to add it
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@ -1342,12 +1338,12 @@ class DrmIonVoucher(object):
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_assert(False, "Unknown lock parameter: %s" % param)
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# i know that version maps to scramble pretty much 1 to 1, but there was precendent where they changed it, so...
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# i know that version maps to scramble pretty much 1 to 1, but there was precendent where they changed it, so...
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sharedsecrets = [obfuscate(shared, self.version),obfuscate2(shared, self.version),obfuscate3(shared, self.version),
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process_V9708(shared), process_V1031(shared), process_V2069(shared), process_V9041(shared),
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process_V3646(shared), process_V6052(shared), process_V9479(shared), process_V9888(shared),
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process_V4648(shared), process_V5683(shared)]
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decrypted=False
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ex=None
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for sharedsecret in sharedsecrets:
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@ -1361,7 +1357,7 @@ class DrmIonVoucher(object):
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_assert(self.drmkey.hasnext() and self.drmkey.next() == TID_LIST and self.drmkey.gettypename() == "com.amazon.drm.KeySet@1.0",
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"Expected KeySet, got %s" % self.drmkey.gettypename())
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decrypted=True
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decrypted=True
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print("Decryption succeeded")
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break
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