Retrieve CIPHER_KEY_SIZE from C++ in Python generate_symmetric_key() (#…

…146)

Fixes #139

python-package/mc2client/core.py

@@ -582,7 +582,7 @@ def generate_keypair(expiration=10 * 365 * 24 * 60 * 60):
     logger.info("Generated certificate and outputted to {}".format(cert_path))
 
 
-def generate_symmetric_key(num_bytes=32):
+def generate_symmetric_key():
     """
     Generate a new symmetric key and save it path specified by user in config YAML passed to `set_config()`
 
@@ -591,6 +591,8 @@ def generate_symmetric_key(num_bytes=32):
     num_bytes : int
         Number of bytes for key
     """
+    num_bytes = _LIB.cipher_key_size()
+
     if _CONF.get("general_config") is None:
         raise MC2ClientConfigError("Configuration not set")
 

src/c_api.cpp

@@ -142,3 +142,5 @@ extern "C" void opaque_decrypt_data(char **encrypted_files,
                                          plaintext_file, key_file);
     *result = status;
 }
+
+extern "C" size_t cipher_key_size() { return CIPHER_KEY_SIZE; }