Updated Ragger tests to use the new private CAL key

tests/ragger/cal/cal.py

@@ -0,0 +1,18 @@
+import os
+import hashlib
+from ecdsa.util import sigencode_der
+from ecdsa import SigningKey
+
+_key: SigningKey = None
+
+def _init_key():
+    global _key
+    with open(os.path.dirname(__file__) + "/key.pem") as pem_file:
+        _key = SigningKey.from_pem(pem_file.read(), hashlib.sha256)
+    assert _key != None
+
+def sign(data: bytes) -> bytes:
+    global _key
+    if not _key:
+        _init_key()
+    return _key.sign_deterministic(data, sigencode=sigencode_der)