Struggling to decrypt

LibRay-PS3/core.py

@@ -16,6 +16,61 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
+import os
+import gzip
 
 ORDER = 'big'
 SECTOR = 2048
+
+def bytes_to_int(byte):
+  return int.from_bytes(byte, ORDER)
+
+class IRD:
+
+  def is_compressed(self, fileobj):
+    fileobj.seek(0)
+    return fileobj.read(4) != b"3IRD"
+
+  def uncompress(self, filename):
+    with gzip.open(filename, 'rb') as gzfile:
+          with open('ird', 'wb') as outfile:
+            outfile.write(gzfile.read())    
+
+  def __init__(self, filename):
+    with open(filename, 'rb') as fileobj:
+      if self.is_compressed(fileobj):
+        self.uncompress(filename)
+
+    self.size = os.stat('ird').st_size
+    with open('ird', 'rb') as ird:
+      self.magic_string = ird.read(4)
+      self.version = bytes_to_int(ird.read(1))
+      self.game_id = ird.read(9)
+      self.game_name = ird.read(12)
+      self.update_version = ird.read(4)
+      self.game_version = ird.read(5)
+      if self.version == 7:
+        self.identifier = ird.read(4)
+      self.header = ird.read(SECTOR*3)
+      self.footer = ird.read(SECTOR)
+      self.region_count = ird.read(1)
+      
+      print(self.game_name, self.update_version, self.game_version, self.region_count)
+
+      ird.seek(self.size - (2 + 115 + 16 + 16))
+      if self.version >= 9:
+        self.pic = ird.read(115)
+      self.data_one = ird.read(16)
+      print(self.data_one.hex())
+      self.data_two = ird.read(16)
+      if self.version < 9:
+        self.pic = ird.read(115)
+      self.uid = ird.read(2)
+
+      print(self.uid)
+    
+    if filename != 'ird':
+      os.rm('ird')
+
+
+