updaate aesIv for 1.2.2-dev

typora.py

@@ -29,6 +29,7 @@ else:
     log.add(sys.stderr, level="INFO")
 
 AES_KEY = struct.pack("<4Q", *[0x252A4C7BD0B85281, 0xA31BD92CE099F719, 0x13E283392646D82D, 0x118BDE501CF74120])
+AES_IV = struct.pack("<4L", *[0x33706964, 0x5387CDD2, 0xD05F336D, 0x53F82468])
 
 
 def _mkDir(_path):
@@ -43,10 +44,10 @@ def _mkDir(_path):
 
 def decScript(b64: bytes, prettify: bool):
     lCode = b64decode(b64)
-    # iv: the first 16 bytes of the file
-    aesIv = lCode[0:16]
+    # iv
+    aesIv = AES_IV
     # cipher text
-    cipherText = lCode[16:]
+    cipherText = lCode[:]
     # AES 256 CBC
     ins = AES.new(key=AES_KEY, iv=aesIv, mode=AES.MODE_CBC)
     code = unpad(ins.decrypt(cipherText), 16, 'pkcs7')
@@ -106,10 +107,10 @@ def extractWdec(asarPath, path, prettify):
 def encScript(_code: bytes, compress):
     if compress:
         _code = jsmin(_code.decode(), quote_chars="'\"`").encode()
-    aesIv = urandom(16)
+    aesIv = AES_IV
     cipherText = _code
     ins = AES.new(key=AES_KEY, iv=aesIv, mode=AES.MODE_CBC)
-    enc = aesIv + ins.encrypt(pad(cipherText, 16, 'pkcs7'))
+    enc = ins.encrypt(pad(cipherText, 16, 'pkcs7'))
     lCode = b64encode(enc)
     return lCode