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优化hmac

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nbwk1988
2015-10-27 10:44:23 +08:00
parent f5740e00b1
commit 1999a03ff7
1 changed files with 12 additions and 10 deletions
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22
lualib/md5.lua
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@@ -15,19 +15,21 @@ function core.sumhexa (k)
end)) end))
end end
function core.hmac_md5(data,key) local function get_ipad(c)
return string.char(c:byte() ~ 0x36)
end
local function get_opad(c)
return string.char(c:byte() ~ 0x5c)
end
function core.hmacmd5(data,key)
if #key>64 then if #key>64 then
key=core.sum(key) key=core.sum(key)
key=string.sub(key,1,16) key=key:sub(1,16)
end
local b=table.pack(string.byte(key,1,#key))
local ipad_s=""
local opad_s=""
for i=1,64 do
ipad_s=ipad_s..string.char((b[i] or 0)~0x36)
opad_s=opad_s..string.char((b[i] or 0)~0x5c)
end end
local ipad_s=key:gsub(".", get_ipad)..string.rep("6",64-#key)
local opad_s=key:gsub(".", get_opad)..string.rep("\\",64-#key)
local istr=core.sum(ipad_s..data) local istr=core.sum(ipad_s..data)
local ostr=core.sumhexa(opad_s..istr) local ostr=core.sumhexa(opad_s..istr)
return ostr return ostr