From b7ed3cbb22c9896c8491b88b2cfdea5d92787323 Mon Sep 17 00:00:00 2001
From: Victor Shyba <victor1984@riseup.net>
Date: Thu, 14 Dec 2017 14:29:14 -0300
Subject: [PATCH] [feature] get_unarmored_ciphertext_size on client
---
src/leap/soledad/client/_crypto.py | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/src/leap/soledad/client/_crypto.py b/src/leap/soledad/client/_crypto.py
index 873b82a8..90cfe45b 100644
--- a/src/leap/soledad/client/_crypto.py
+++ b/src/leap/soledad/client/_crypto.py
@@ -538,3 +538,13 @@ def _ceiling(size):
step = 2 ** i
if size < step:
return step
+
+
+def get_unarmored_ciphertext_size(cleartext_size):
+ # used for blobs stream up (so we can tell the server how much data we are
+ # sending before starting to encrypt the stream)
+ PREAMBLE_SIZE = 736 # 552 urlsafe base64 encoded (it's always armored)
+ TAG_SIZE = 16
+ SEPARATOR_SIZE = 1
+ size = TAG_SIZE + PREAMBLE_SIZE + SEPARATOR_SIZE
+ return cleartext_size + size
--
GitLab