Create util function to accurately get curve keysize

2018-02-08 13:58:14 -07:00 · 2018-02-08 13:58:14 -07:00 · 8efafb79f8
parent db4842370e
commit 8efafb79f8
1 changed files with 6 additions and 0 deletions
--- a/umbral/utils.py
+++ b/umbral/utils.py
@ -1,3 +1,5 @@
+import math
+
 from cryptography.hazmat.backends import default_backend
 from cryptography.hazmat.primitives import hashes
 from cryptography.hazmat.primitives.kdf.hkdf import HKDF
@ -111,3 +113,7 @@ def kdf(ecpoint, key_length):
        info=None,
        backend=default_backend()
    ).derive(data)
+
+
+def get_curve_keysize_bytes(curve):
+    return int(math.ceil(curve.key_size / 8.00))