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Avoid edge case where cipher chunk size could be less than 1. See #945

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dmiller 2017-07-28 04:03:55 +00:00
parent 83d46cd9fb
commit 75a873840c
1 changed files with 2 additions and 1 deletions
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3
scripts/ssl-enum-ciphers.nse
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@ -415,6 +415,7 @@ end
local function in_chunks(t, size)
size = math.floor(size)
if size < 1 then size = 1 end
local ret = {}
for i = 1, #t, size do
local chunk = {}
@ -787,7 +788,7 @@ local function get_chunk_size(host, protocol)
local cipher_len_remaining = 255 - #tls.client_hello(len_t)
-- if we're over 255 anyway, just go for it.
-- Each cipher adds 2 bytes
local max_chunks = cipher_len_remaining > 0 and cipher_len_remaining / 2 or CHUNK_SIZE
local max_chunks = cipher_len_remaining > 1 and cipher_len_remaining // 2 or CHUNK_SIZE
-- otherwise, use the min
return max_chunks < CHUNK_SIZE and max_chunks or CHUNK_SIZE
end