prosody
4c9bd0527d1d
util/hmac.lua

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util/hmac.lua @ 1516:4c9bd0527d1d

util.hmac: Convert spaces to tabs
author Matthew Wild <mwild1@gmail.com>
date Fri, 10 Jul 2009 02:19:51 +0100
parent 1482:9734231a569f
child 1522:569d58d21612
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 local hashes = require "util.hashes"
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2 local xor = require "bit".bxor
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3
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4 local t_insert, t_concat = table.insert, table.concat;
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5 local s_char = string.char;
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6
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7 module "hmac"
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8
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9 local function arraystr(array)
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10 local t = {}
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11 for i = 1,#array do
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12 t_insert(t, s_char(array[i]))
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13 end
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14
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15 return t_concat(t)
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16 end
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17
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18 --[[
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19 key
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20 the key to use in the hash
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21 message
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22 the message to hash
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23 hash
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24 the hash function
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25 blocksize
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26 the blocksize for the hash function in bytes
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27 hex
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28 return raw hash or hexadecimal string
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29 --]]
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30 function hmac(key, message, hash, blocksize, hex)
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31 local opad = {}
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32 local ipad = {}
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33
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34 for i = 1,blocksize do
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35 opad[i] = 0x5c
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36 ipad[i] = 0x36
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37 end
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38
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39 if #key > blocksize then
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40 key = hash(key)
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41 end
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42
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43 for i = 1,#key do
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44 ipad[i] = xor(ipad[i],key:sub(i,i):byte())
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45 opad[i] = xor(opad[i],key:sub(i,i):byte())
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46 end
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47
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48 opad = arraystr(opad)
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49 ipad = arraystr(ipad)
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50
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51 if hex then
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52 return hash(opad..hash(ipad..message), true)
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53 else
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54 return hash(opad..hash(ipad..message))
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55 end
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56 end
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57
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58 function md5(key, message, hex)
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59 return hmac(key, message, hashes.md5, 64, hex)
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60 end
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61
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62 function sha1(key, message, hex)
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63 return hmac(key, message, hashes.sha1, 64, hex)
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64 end
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65
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66 function sha256(key, message, hex)
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67 return hmac(key, message, hashes.sha256, 64, hex)
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68 end
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69
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70 return _M