+-- Prosody IM
+-- Copyright (C) 2008-2009 Matthew Wild
+-- Copyright (C) 2008-2009 Waqas Hussain
+--
+-- This project is MIT/X11 licensed. Please see the
+-- COPYING file in the source package for more information.
+--
+
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,table.getn(array) do
- table.insert(t, string.char(array[i]))
- end
+ local t = {}
+ for i = 1,#array do
+ t_insert(t, s_char(array[i]))
+ end
- return table.concat(t)
+ return t_concat(t)
end
--[[
key
- the key to use in the hash
+ the key to use in the hash
message
- the message to hash
+ the message to hash
hash
- the hash function
+ the hash function
blocksize
- the blocksize for the hash function in bytes
+ 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
+ local opad = {}
+ local ipad = {}
+
+ for i = 1,blocksize do
+ opad[i] = 0x5c
+ ipad[i] = 0x36
+ end
- if #key > blocksize then
- key = hash(key)
- 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
+ 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)
+ opad = arraystr(opad)
+ ipad = arraystr(ipad)
- if hex then
- return hash(opad..hash(ipad..message), true)
- else
- return hash(opad..hash(ipad..message))
- end
+ 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)
+ return hmac(key, message, hashes.md5, 64, hex)
end
function sha1(key, message, hex)
- return hmac(key, message, hashes.sha1, 64, hex)
+ return hmac(key, message, hashes.sha1, 64, hex)
end
function sha256(key, message, hex)
- return hmac(key, message, hashes.sha256, 64, hex)
+ return hmac(key, message, hashes.sha256, 64, hex)
end
return _M