From bda647bd5bbffb5c746310b3dfb8e7b4fe4a50b7 Mon Sep 17 00:00:00 2001
From: Aldo Bleeker <2095835+ableeker@users.noreply.github.com>
Date: Sun, 19 Sep 2021 23:35:45 +0200
Subject: [PATCH] Python 3 fix

---
 DeDRM_plugin/alfcrypto.py    | 10 ++++++----
 DeDRM_plugin/topazextract.py |  8 +++++++-
 2 files changed, 13 insertions(+), 5 deletions(-)

diff --git a/DeDRM_plugin/alfcrypto.py b/DeDRM_plugin/alfcrypto.py
index 5c197a7..5a31d09 100644
--- a/DeDRM_plugin/alfcrypto.py
+++ b/DeDRM_plugin/alfcrypto.py
@@ -207,8 +207,9 @@ def __init__(self):
 
         def ctx_init(self, key):
             ctx1 = 0x0CAFFE19E
-            for keyChar in key:
-                keyByte = ord(keyChar)
+            if isinstance(key, str):
+                key = key.encode('latin-1')
+            for keyByte in key:
                 ctx2 = ctx1
                 ctx1 = ((((ctx1 >>2) * (ctx1 >>7))&0xFFFFFFFF) ^ (keyByte * keyByte * 0x0F902007)& 0xFFFFFFFF )
             self._ctx = [ctx1, ctx2]
@@ -220,8 +221,9 @@ def decrypt(self, data,  ctx=None):
             ctx1 = ctx[0]
             ctx2 = ctx[1]
             plainText = ""
-            for dataChar in data:
-                dataByte = ord(dataChar)
+            if isinstance(data, str):
+                data = data.encode('latin-1')
+            for dataByte in data:
                 m = (dataByte ^ ((ctx1 >> 3) &0xFF) ^ ((ctx2<<3) & 0xFF)) &0xFF
                 ctx2 = ctx1
                 ctx1 = (((ctx1 >> 2) * (ctx1 >> 7)) &0xFFFFFFFF) ^((m * m * 0x0F902007) &0xFFFFFFFF)
diff --git a/DeDRM_plugin/topazextract.py b/DeDRM_plugin/topazextract.py
index bdbf1eb..66f09fd 100644
--- a/DeDRM_plugin/topazextract.py
+++ b/DeDRM_plugin/topazextract.py
@@ -172,6 +172,8 @@ def decryptRecord(data,PID):
 # Try to decrypt a dkey record (contains the bookPID)
 def decryptDkeyRecord(data,PID):
     record = decryptRecord(data,PID)
+    if isinstance(record, str):
+        record = record.encode('latin-1')
     fields = unpack('3sB8sB8s3s',record)
     if fields[0] != b'PID' or fields[5] != b'pid' :
         raise DrmException("Didn't find PID magic numbers in record")
@@ -315,6 +317,8 @@ def getBookPayloadRecord(self, name, index):
                 raise DrmException("Error: Attempt to decrypt without bookKey")
 
         if compressed:
+            if isinstance(record, str):
+                record = bytes(record, 'latin-1')
             record = zlib.decompress(record)
 
         return record
@@ -346,7 +350,7 @@ def processBook(self, pidlst):
             # use 8 digit pids here
             pid = pid[0:8]
             if isinstance(pid, str):
-                pid = pid.encode('utf-8')
+                pid = pid.encode('latin-1')
             print("Trying: {0}".format(pid))
             bookKeys = []
             data = keydata
@@ -417,6 +421,8 @@ def extractFiles(self):
                     outputFile = os.path.join(destdir,fname)
                     print(".", end=' ')
                     record = self.getBookPayloadRecord(name,index)
+                    if isinstance(record, str):
+                        record=bytes(record, 'latin-1')
                     if record != b'':
                         open(outputFile, 'wb').write(record)
                 print(" ")