Fix signBytes for impersonated credentials

Fixes google-auth-library-python#338
googleapis · May 7, 2020 · cec645e · cec645e
1 parent 7c9e8c2
commit cec645e
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/google/auth/impersonated_credentials.py b/google/auth/impersonated_credentials.py
@@ -264,7 +264,7 @@ def sign_bytes(self, message):
 
         iam_sign_endpoint = _IAM_SIGN_ENDPOINT.format(self._target_principal)
 
-        body = {"payload": base64.b64encode(message), "delegates": self._delegates}
+        body = {"payload": base64.b64encode(message).decode("utf-8"), "delegates": self._delegates}
 
         headers = {"Content-Type": "application/json"}