prosody
0.6.0
util/hmac.lua

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util/hmac.lua @ 2168:1a99a3bf3ce6 0.6.0

Merge with 0.6 on prosody.im
author Matthew Wild <mwild1@gmail.com>
date Wed, 25 Nov 2009 05:11:10 +0000
parent 1522:569d58d21612
child 2268:770a75623ed7
child 2923:b7049746bd29
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1 -- Prosody IM
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2 -- Copyright (C) 2008-2009 Matthew Wild
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3 -- Copyright (C) 2008-2009 Waqas Hussain
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4 --
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5 -- This project is MIT/X11 licensed. Please see the
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6 -- COPYING file in the source package for more information.
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7 --
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8
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9 local hashes = require "util.hashes"
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10 local xor = require "bit".bxor
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11
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12 local t_insert, t_concat = table.insert, table.concat;
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13 local s_char = string.char;
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14
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15 module "hmac"
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17 local function arraystr(array)
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18 local t = {}
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19 for i = 1,#array do
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20 t_insert(t, s_char(array[i]))
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21 end
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22
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23 return t_concat(t)
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24 end
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25
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26 --[[
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27 key
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28 the key to use in the hash
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29 message
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30 the message to hash
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31 hash
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32 the hash function
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33 blocksize
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34 the blocksize for the hash function in bytes
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35 hex
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36 return raw hash or hexadecimal string
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37 --]]
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38 function hmac(key, message, hash, blocksize, hex)
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39 local opad = {}
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40 local ipad = {}
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41
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42 for i = 1,blocksize do
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43 opad[i] = 0x5c
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44 ipad[i] = 0x36
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45 end
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46
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47 if #key > blocksize then
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48 key = hash(key)
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49 end
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50
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51 for i = 1,#key do
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52 ipad[i] = xor(ipad[i],key:sub(i,i):byte())
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53 opad[i] = xor(opad[i],key:sub(i,i):byte())
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54 end
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55
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56 opad = arraystr(opad)
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57 ipad = arraystr(ipad)
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58
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59 if hex then
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60 return hash(opad..hash(ipad..message), true)
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61 else
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62 return hash(opad..hash(ipad..message))
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63 end
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64 end
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65
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66 function md5(key, message, hex)
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67 return hmac(key, message, hashes.md5, 64, hex)
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68 end
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69
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70 function sha1(key, message, hex)
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71 return hmac(key, message, hashes.sha1, 64, hex)
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72 end
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73
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74 function sha256(key, message, hex)
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75 return hmac(key, message, hashes.sha256, 64, hex)
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76 end
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77
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78 return _M