X-Git-Url: https://git.enpas.org/?a=blobdiff_plain;f=util%2Fhmac.lua;h=ffd69d91e9444625b5919961ad69e6cd7bbe29bb;hb=7cde004ab530110577c5107636bc010576f29df1;hp=053765750f99f44ad4cb1bb46807c7df5d8a94df;hpb=edd33fd5ed8822863b62f1c3fc28159f9272e8ae;p=prosody.git

diff --git a/util/hmac.lua b/util/hmac.lua
index 05376575..ffd69d91 100644
--- a/util/hmac.lua
+++ b/util/hmac.lua
@@ -1,67 +1,78 @@
+-- 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