prosody
95ccbd5e280f
util/hmac.lua

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util/hmac.lua @ 4002:95ccbd5e280f

modulemanager: Removed an unused variable.
author Waqas Hussain <waqas20@gmail.com>
date Wed, 05 Jan 2011 06:16:27 +0500
parent 3540:bc139431830b
child 5537:15464633d8fb
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1 -- Prosody IM
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2 -- Copyright (C) 2008-2010 Matthew Wild
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3 -- Copyright (C) 2008-2010 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
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11 local s_char = string.char;
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12 local s_gsub = string.gsub;
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13 local s_rep = string.rep;
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14
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15 module "hmac"
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16
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17 local xor_map = {0;1;2;3;4;5;6;7;8;9;10;11;12;13;14;15;1;0;3;2;5;4;7;6;9;8;11;10;13;12;15;14;2;3;0;1;6;7;4;5;10;11;8;9;14;15;12;13;3;2;1;0;7;6;5;4;11;10;9;8;15;14;13;12;4;5;6;7;0;1;2;3;12;13;14;15;8;9;10;11;5;4;7;6;1;0;3;2;13;12;15;14;9;8;11;10;6;7;4;5;2;3;0;1;14;15;12;13;10;11;8;9;7;6;5;4;3;2;1;0;15;14;13;12;11;10;9;8;8;9;10;11;12;13;14;15;0;1;2;3;4;5;6;7;9;8;11;10;13;12;15;14;1;0;3;2;5;4;7;6;10;11;8;9;14;15;12;13;2;3;0;1;6;7;4;5;11;10;9;8;15;14;13;12;3;2;1;0;7;6;5;4;12;13;14;15;8;9;10;11;4;5;6;7;0;1;2;3;13;12;15;14;9;8;11;10;5;4;7;6;1;0;3;2;14;15;12;13;10;11;8;9;6;7;4;5;2;3;0;1;15;14;13;12;11;10;9;8;7;6;5;4;3;2;1;0;};
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18 local function xor(x, y)
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19 local lowx, lowy = x % 16, y % 16;
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20 local hix, hiy = (x - lowx) / 16, (y - lowy) / 16;
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21 local lowr, hir = xor_map[lowx * 16 + lowy + 1], xor_map[hix * 16 + hiy + 1];
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22 local r = hir * 16 + lowr;
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23 return r;
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24 end
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25 local opadc, ipadc = s_char(0x5c), s_char(0x36);
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26 local ipad_map = {};
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27 local opad_map = {};
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28 for i=0,255 do
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29 ipad_map[s_char(i)] = s_char(xor(0x36, i));
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30 opad_map[s_char(i)] = s_char(xor(0x5c, i));
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31 end
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32
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33 --[[
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34 key
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35 the key to use in the hash
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36 message
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37 the message to hash
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38 hash
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39 the hash function
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40 blocksize
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41 the blocksize for the hash function in bytes
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42 hex
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43 return raw hash or hexadecimal string
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44 --]]
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45 function hmac(key, message, hash, blocksize, hex)
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46 if #key > blocksize then
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47 key = hash(key)
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48 end
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49
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50 local padding = blocksize - #key;
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51 local ipad = s_gsub(key, ".", ipad_map)..s_rep(ipadc, padding);
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52 local opad = s_gsub(key, ".", opad_map)..s_rep(opadc, padding);
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53
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54 return hash(opad..hash(ipad..message), hex)
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55 end
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57 function md5(key, message, hex)
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58 return hmac(key, message, hashes.md5, 64, hex)
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59 end
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60
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61 function sha1(key, message, hex)
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62 return hmac(key, message, hashes.sha1, 64, hex)
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63 end
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64
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65 function sha256(key, message, hex)
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66 return hmac(key, message, hashes.sha256, 64, hex)
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67 end
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68
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69 return _M