Mercurial > prosody-hg
annotate util/hmac.lua @ 1482:9734231a569f
util.hmac: Some optimisations
| author | Matthew Wild <mwild1@gmail.com> |
|---|---|
| date | Sun, 05 Jul 2009 17:10:42 +0100 |
| parents | 6401460891b2 |
| children | 4c9bd0527d1d |
| rev | line source |
|---|---|
| 1456 | 1 local hashes = require "util.hashes" |
| 2 local xor = require "bit".bxor | |
| 3 | |
|
1482
9734231a569f
util.hmac: Some optimisations
Matthew Wild <mwild1@gmail.com>
parents:
1481
diff
changeset
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4 local t_insert, t_concat = table.insert, table.concat; |
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9734231a569f
util.hmac: Some optimisations
Matthew Wild <mwild1@gmail.com>
parents:
1481
diff
changeset
|
5 local s_char = string.char; |
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9734231a569f
util.hmac: Some optimisations
Matthew Wild <mwild1@gmail.com>
parents:
1481
diff
changeset
|
6 |
| 1456 | 7 module "hmac" |
| 8 | |
| 9 local function arraystr(array) | |
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1481
6401460891b2
util.hmac: Fix a global set
Matthew Wild <mwild1@gmail.com>
parents:
1456
diff
changeset
|
10 local t = {} |
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1482
9734231a569f
util.hmac: Some optimisations
Matthew Wild <mwild1@gmail.com>
parents:
1481
diff
changeset
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11 for i = 1,#array do |
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9734231a569f
util.hmac: Some optimisations
Matthew Wild <mwild1@gmail.com>
parents:
1481
diff
changeset
|
12 t_insert(t, s_char(array[i])) |
| 1456 | 13 end |
| 14 | |
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1482
9734231a569f
util.hmac: Some optimisations
Matthew Wild <mwild1@gmail.com>
parents:
1481
diff
changeset
|
15 return t_concat(t) |
| 1456 | 16 end |
| 17 | |
| 18 --[[ | |
| 19 key | |
| 20 the key to use in the hash | |
| 21 message | |
| 22 the message to hash | |
| 23 hash | |
| 24 the hash function | |
| 25 blocksize | |
| 26 the blocksize for the hash function in bytes | |
| 27 hex | |
| 28 return raw hash or hexadecimal string | |
| 29 --]] | |
| 30 function hmac(key, message, hash, blocksize, hex) | |
| 31 local opad = {} | |
| 32 local ipad = {} | |
| 33 | |
| 34 for i = 1,blocksize do | |
| 35 opad[i] = 0x5c | |
| 36 ipad[i] = 0x36 | |
| 37 end | |
| 38 | |
| 39 if #key > blocksize then | |
| 40 key = hash(key) | |
| 41 end | |
| 42 | |
| 43 for i = 1,#key do | |
| 44 ipad[i] = xor(ipad[i],key:sub(i,i):byte()) | |
| 45 opad[i] = xor(opad[i],key:sub(i,i):byte()) | |
| 46 end | |
| 47 | |
| 48 opad = arraystr(opad) | |
| 49 ipad = arraystr(ipad) | |
| 50 | |
| 51 if hex then | |
| 52 return hash(opad..hash(ipad..message), true) | |
| 53 else | |
| 54 return hash(opad..hash(ipad..message)) | |
| 55 end | |
| 56 end | |
| 57 | |
| 58 function md5(key, message, hex) | |
| 59 return hmac(key, message, hashes.md5, 64, hex) | |
| 60 end | |
| 61 | |
| 62 function sha1(key, message, hex) | |
| 63 return hmac(key, message, hashes.sha1, 64, hex) | |
| 64 end | |
| 65 | |
| 66 function sha256(key, message, hex) | |
| 67 return hmac(key, message, hashes.sha256, 64, hex) | |
| 68 end | |
| 69 | |
| 70 return _M |