openpilot v0.9.6 release

date: 2024-02-21T23:02:42
master commit: 0b4d08fab8e35a264bc7383e878538f8083c33e5

body/crypto/sign.py

@@ -0,0 +1,38 @@
+#!/usr/bin/env python3
+import os
+import sys
+import struct
+import hashlib
+from Crypto.PublicKey import RSA
+import binascii
+
+# increment this to make new hardware not run old versions
+VERSION = 2
+
+if __name__ == "__main__":
+  with open(sys.argv[3], encoding='utf8') as k:
+    rsa = RSA.importKey(k.read())
+
+  with open(sys.argv[1], "rb") as f:
+    dat = f.read()
+
+  print("signing", len(dat), "bytes")
+
+  with open(sys.argv[2], "wb") as f:
+    if os.getenv("SETLEN") is not None:
+      # add the version at the end
+      dat += b"VERS" + struct.pack("I", VERSION)
+      # add the length at the beginning
+      x = struct.pack("I", len(dat)) + dat[4:]
+      # mock signature of dat[4:]
+      dd = hashlib.sha1(dat[4:]).digest()
+    else:
+      x = dat
+      dd = hashlib.sha1(dat).digest()
+
+    print("hash:", str(binascii.hexlify(dd), "utf-8"))
+    dd = b"\x00\x01" + b"\xff" * 0x69 + b"\x00" + dd
+    rsa_out = pow(int.from_bytes(dd, byteorder='big', signed=False), rsa.d, rsa.n)
+    sig = (hex(rsa_out)[2:].rjust(0x100, '0'))
+    x += binascii.unhexlify(sig)
+    f.write(x)