ejabberdsql2prosody: Improved help message

[prosody.git] / util / hmac.lua

diff --git a/util/hmac.lua b/util/hmac.lua
index 5f4467cf7aa2a5be1dd6ca17b005b83b23198bf7..ffd69d91e9444625b5919961ad69e6cd7bbe29bb 100644 (file)
--- a/util/hmac.lua
+++ b/util/hmac.lua
@@ -1,3 +1,11 @@
+-- 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
 
@@ -7,64 +15,64 @@ 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
+       local t = {}
+       for i = 1,#array do
+               t_insert(t, s_char(array[i]))
+       end
 
-    return t_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