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Use better packing to avoid excessive concatenations

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This commit is contained in:
dmiller 2015-02-10 05:58:44 +00:00
parent dd40ba14ea
commit c37923f4e5
1 changed files with 6 additions and 6 deletions
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12
scripts/dns-nsec3-enum.nse
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@ -177,16 +177,16 @@ end
local function generate_hash(domain, iter, salt)
local rand_str = random_string()
local random_domain = rand_str .. "." .. domain
local packed_domain = ""
for word in string.gmatch(domain,"[^%.]+") do
packed_domain = packed_domain .. bin.pack("c",string.len(word)) .. word
local packed_domain = {}
for word in string.gmatch(random_domain, "[^%.]+") do
packed_domain[#packed_domain+1] = bin.pack("p", word)
end
local to_hash = bin.pack("c",string.len(rand_str)) .. rand_str .. packed_domain .. bin.pack("c",0) .. bin.pack("H",salt)
salt = bin.pack("H", salt)
local to_hash = bin.pack("AxA", table.concat(packed_domain), salt)
iter = iter - 1
local hash = openssl.sha1(to_hash)
for i=0,iter do
hash = hash .. bin.pack("H",salt)
hash = openssl.sha1(hash)
hash = openssl.sha1(hash .. salt)
end
return string.lower(base32.enc(hash,true)), random_domain
end