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local hashes = require "util.hashes"
local xor = require "bit".bxor
local t_insert, t_concat = table.insert, table.concat;
local s_char = string.char;
module "hmac"
local function arraystr(array)
local t = {}
for i = 1,#array do
t_insert(t, s_char(array[i]))
end
return t_concat(t)
end
--[[
key
the key to use in the hash
message
the message to hash
hash
the hash function
blocksize
the blocksize for the hash function in bytes
hex
return raw hash or hexadecimal string
--]]
function hmac(key, message, hash, blocksize, hex)
local opad = {}
local ipad = {}
for i = 1,blocksize do
opad[i] = 0x5c
ipad[i] = 0x36
end
if #key > blocksize then
key = hash(key)
end
for i = 1,#key do
ipad[i] = xor(ipad[i],key:sub(i,i):byte())
opad[i] = xor(opad[i],key:sub(i,i):byte())
end
opad = arraystr(opad)
ipad = arraystr(ipad)
if hex then
return hash(opad..hash(ipad..message), true)
else
return hash(opad..hash(ipad..message))
end
end
function md5(key, message, hex)
return hmac(key, message, hashes.md5, 64, hex)
end
function sha1(key, message, hex)
return hmac(key, message, hashes.sha1, 64, hex)
end
function sha256(key, message, hex)
return hmac(key, message, hashes.sha256, 64, hex)
end
return _M
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