v 3.0.3

app/core/crypto.py

@@ -0,0 +1,20 @@
+import base64
+
+import rsa
+
+
+def get_rsa_key(response_data: dict) -> tuple[str, str, int]:
+    """Extract RSA key components from Steam's getrsakey response."""
+    mod = response_data["publickey_mod"]
+    exp = response_data["publickey_exp"]
+    timestamp = int(response_data["timestamp"])
+    return mod, exp, timestamp
+
+
+def encrypt_password(password: str, mod_hex: str, exp_hex: str) -> str:
+    """RSA-encrypt a password using Steam's public key, return base64."""
+    mod = int(mod_hex, 16)
+    exp = int(exp_hex, 16)
+    public_key = rsa.PublicKey(mod, exp)
+    encrypted = rsa.encrypt(password.encode("ascii"), public_key)
+    return base64.b64encode(encrypted).decode("ascii")