upload settingcrypt.py

settingcrypt.py

@@ -0,0 +1,70 @@
+"""
+settingcrypt - Encrypt/decrypt setting.txt.
+Interactive Python version of the setting.txt encryption
+code from Wiibrew.
+
+Copyright (c) 2023 Emily Daemon
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+"""
+import argparse
+
+DEBUG = False
+
+parser = argparse.ArgumentParser(
+    prog="settingcrypt",
+    description="Encrypt/decrypt setting.txt.")
+parser.add_argument(
+    "input",
+    help="Input filename. Set to - for stdin",
+    type=argparse.FileType("rb"))
+parser.add_argument(
+    "output",
+    help="Output filename. Set to - for stdout.",
+    type=argparse.FileType("wb"))
+args = parser.parse_args()
+
+def hushprint(text):
+    """Debug print function."""
+    if DEBUG:
+        print(text)
+
+def scrypt(buf: bytes) -> bytes:
+    """
+    Encrypt a bytes object. Returns a bytes object.
+    Python rewrite of the following:
+    https://wiibrew.org/wiki//title/00000001/00000002/data/setting.txt#Encryption
+    """
+    buf_arr = bytearray(buf)
+    key = 0x73B5DBFA
+    buf_crypted = []
+
+    for byte in buf_arr:
+        byte ^= key & 0xff
+        key = (key << 1) | (key >> 31)
+        buf_crypted.append(byte)
+
+    return bytes(buf_crypted)
+
+input_file = args.input.read()
+hushprint(f"Encrypting {args.input.name}.")
+decoded = scrypt(input_file)
+hushprint(f"Success. Writing to {args.output.name}.")
+args.output.write(decoded)
+hushprint("Success.")