Mercurial > yubikey-lua / file comparison
comparison: aeslua/ciphermode.lua
aeslua/ciphermode.lua
- changeset 0
- 598d09faf89c
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| -1:000000000000 | 0:598d09faf89c |
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| 1 local aes = require("aeslua.aes"); | |
| 2 local util = require("aeslua.util"); | |
| 3 local buffer = require("aeslua.buffer"); | |
| 4 | |
| 5 local public = {}; | |
| 6 | |
| 7 local aeslua = require("aeslua"); | |
| 8 aeslua.ciphermode = public; | |
| 9 | |
| 10 -- | |
| 11 -- Encrypt strings | |
| 12 -- key - byte array with key | |
| 13 -- string - string to encrypt | |
| 14 -- modefunction - function for cipher mode to use | |
| 15 -- | |
| 16 function public.encryptString(key, data, modeFunction) | |
| 17 local iv = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}; | |
| 18 local keySched = aes.expandEncryptionKey(key); | |
| 19 local encryptedData = buffer.new(); | |
| 20 | |
| 21 for i = 1, #data/16 do | |
| 22 local offset = (i-1)*16 + 1; | |
| 23 local byteData = {string.byte(data,offset,offset +15)}; | |
| 24 | |
| 25 modeFunction(keySched, byteData, iv); | |
| 26 | |
| 27 buffer.addString(encryptedData, string.char(unpack(byteData))); | |
| 28 end | |
| 29 | |
| 30 return buffer.toString(encryptedData); | |
| 31 end | |
| 32 | |
| 33 -- | |
| 34 -- the following 4 functions can be used as | |
| 35 -- modefunction for encryptString | |
| 36 -- | |
| 37 | |
| 38 -- Electronic code book mode encrypt function | |
| 39 function public.encryptECB(keySched, byteData, iv) | |
| 40 aes.encrypt(keySched, byteData, 1, byteData, 1); | |
| 41 end | |
| 42 | |
| 43 -- Cipher block chaining mode encrypt function | |
| 44 function public.encryptCBC(keySched, byteData, iv) | |
| 45 util.xorIV(byteData, iv); | |
| 46 | |
| 47 aes.encrypt(keySched, byteData, 1, byteData, 1); | |
| 48 | |
| 49 for j = 1,16 do | |
| 50 iv[j] = byteData[j]; | |
| 51 end | |
| 52 end | |
| 53 | |
| 54 -- Output feedback mode encrypt function | |
| 55 function public.encryptOFB(keySched, byteData, iv) | |
| 56 aes.encrypt(keySched, iv, 1, iv, 1); | |
| 57 util.xorIV(byteData, iv); | |
| 58 end | |
| 59 | |
| 60 -- Cipher feedback mode encrypt function | |
| 61 function public.encryptCFB(keySched, byteData, iv) | |
| 62 aes.encrypt(keySched, iv, 1, iv, 1); | |
| 63 util.xorIV(byteData, iv); | |
| 64 | |
| 65 for j = 1,16 do | |
| 66 iv[j] = byteData[j]; | |
| 67 end | |
| 68 end | |
| 69 | |
| 70 -- | |
| 71 -- Decrypt strings | |
| 72 -- key - byte array with key | |
| 73 -- string - string to decrypt | |
| 74 -- modefunction - function for cipher mode to use | |
| 75 -- | |
| 76 function public.decryptString(key, data, modeFunction) | |
| 77 local iv = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}; | |
| 78 | |
| 79 local keySched; | |
| 80 if (modeFunction == public.decryptOFB or modeFunction == public.decryptCFB) then | |
| 81 keySched = aes.expandEncryptionKey(key); | |
| 82 else | |
| 83 keySched = aes.expandDecryptionKey(key); | |
| 84 end | |
| 85 | |
| 86 local decryptedData = buffer.new(); | |
| 87 | |
| 88 for i = 1, #data/16 do | |
| 89 local offset = (i-1)*16 + 1; | |
| 90 local byteData = {string.byte(data,offset,offset +15)}; | |
| 91 | |
| 92 iv = modeFunction(keySched, byteData, iv); | |
| 93 | |
| 94 buffer.addString(decryptedData, string.char(unpack(byteData))); | |
| 95 end | |
| 96 | |
| 97 return buffer.toString(decryptedData); | |
| 98 end | |
| 99 | |
| 100 -- | |
| 101 -- the following 4 functions can be used as | |
| 102 -- modefunction for decryptString | |
| 103 -- | |
| 104 | |
| 105 -- Electronic code book mode decrypt function | |
| 106 function public.decryptECB(keySched, byteData, iv) | |
| 107 | |
| 108 aes.decrypt(keySched, byteData, 1, byteData, 1); | |
| 109 | |
| 110 return iv; | |
| 111 end | |
| 112 | |
| 113 -- Cipher block chaining mode decrypt function | |
| 114 function public.decryptCBC(keySched, byteData, iv) | |
| 115 local nextIV = {}; | |
| 116 for j = 1,16 do | |
| 117 nextIV[j] = byteData[j]; | |
| 118 end | |
| 119 | |
| 120 aes.decrypt(keySched, byteData, 1, byteData, 1); | |
| 121 util.xorIV(byteData, iv); | |
| 122 | |
| 123 return nextIV; | |
| 124 end | |
| 125 | |
| 126 -- Output feedback mode decrypt function | |
| 127 function public.decryptOFB(keySched, byteData, iv) | |
| 128 aes.encrypt(keySched, iv, 1, iv, 1); | |
| 129 util.xorIV(byteData, iv); | |
| 130 | |
| 131 return iv; | |
| 132 end | |
| 133 | |
| 134 -- Cipher feedback mode decrypt function | |
| 135 function public.decryptCFB(keySched, byteData, iv) | |
| 136 local nextIV = {}; | |
| 137 for j = 1,16 do | |
| 138 nextIV[j] = byteData[j]; | |
| 139 end | |
| 140 | |
| 141 aes.encrypt(keySched, iv, 1, iv, 1); | |
| 142 | |
| 143 util.xorIV(byteData, iv); | |
| 144 | |
| 145 return nextIV; | |
| 146 end | |
| 147 | |
| 148 return public; |
