From ba012dae6e6d9bfef4d9c48c62f7dc51dce4088d Mon Sep 17 00:00:00 2001
From: Mike <mike@noreply.localhost>
Date: Thu, 28 Aug 2025 15:14:08 +0000
Subject: [PATCH] Add decrypt.py

script for decrypt PlayReady or L1 keybox
---
 decrypt.py | 41 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)
 create mode 100644 decrypt.py

diff --git a/decrypt.py b/decrypt.py
new file mode 100644
index 0000000..892eb3c
--- /dev/null
+++ b/decrypt.py
@@ -0,0 +1,41 @@
+from Crypto.Cipher import AES
+from Crypto.Util.Padding import pad, unpad
+
+
+def save_bgroup(data):
+    with open("bgroupcert.dat", "wb") as f:
+        f.write(data)
+
+
+def save_zgpriv(data):
+    with open("zgpriv.dat", "wb") as f:
+       f.write(data[:32])
+
+
+def save_keybox(data):
+    with open("keybox.dat", "wb") as f:
+       f.write(data[:128])
+
+
+
+def decrypt_aes_ecb(input_file, key):
+    with open(input_file, "rb") as f:
+        encrypted_data = f.read()
+    cipher = AES.new(bytes.fromhex(key), AES.MODE_ECB)
+    dec_data = cipher.decrypt(pad(encrypted_data, 16))
+    if b"INNER_MSTAR" in dec_data:
+        fixed_data = dec_data[64:]
+        if b"CHAI" in fixed_data:
+            print("BGROUPCERT.dat SAVED AS bgroupcert.dat")
+            save_bgroup(fixed_data)
+        elif b"kbox" in fixed_data:
+            print("WIDEVINE KEYBOX SAVED AS keybox.dat")
+            save_keybox(fixed_data)
+        else:
+            print("ZGPRIV saved as zgpriv.dat")
+            save_zgpriv(fixed_data)
+    else:
+        print("Key not working")
+
+key = "0007FF4154534D92FC55AA0FFF0110E0"
+decrypt_aes_ecb("keybox_encrypted.dat", key)