From 71dcf367d39225c2bca9a2221611e0a8cfa35eca Mon Sep 17 00:00:00 2001
From: Alex Zhang <zchao1995@gmail.com>
Date: Mon, 19 Oct 2020 14:53:48 +0800
Subject: [PATCH] change: read 8bytes from /dev/urandom as the random seed for
 better randomness (#2437)

---
 apisix/core/utils.lua | 5 +++--
 t/core/utils.t        | 2 +-
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/apisix/core/utils.lua b/apisix/core/utils.lua
index 61963a9e0ad7..a7cad379e629 100644
--- a/apisix/core/utils.lua
+++ b/apisix/core/utils.lua
@@ -52,16 +52,17 @@ function _M.get_seed_from_urandom()
         return nil, 'failed to open /dev/urandom: ' .. err
     end
 
-    local str = frandom:read(4)
+    local str = frandom:read(8)
     frandom:close()
     if not str then
         return nil, 'failed to read data from /dev/urandom'
     end
 
     local seed = 0
-    for i = 1, 4 do
+    for i = 1, 8 do
         seed = 256 * seed + str:byte(i)
     end
+
     return seed
 end
 
diff --git a/t/core/utils.t b/t/core/utils.t
index 25b0419b258b..817db25af277 100644
--- a/t/core/utils.t
+++ b/t/core/utils.t
@@ -38,7 +38,7 @@ __DATA__
 --- request
 GET /t
 --- response_body_like eval
-qr/random seed \d+\ntwice: false/
+qr/random seed \d+(\.\d+)?(e\+\d+)?\ntwice: false/