corrade-nucleus-nucleons – Blame information for rev 2
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2 | office | 1 | /* |
2 | CryptoJS v3.1.2 |
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3 | code.google.com/p/crypto-js |
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4 | (c) 2009-2013 by Jeff Mott. All rights reserved. |
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5 | code.google.com/p/crypto-js/wiki/License |
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6 | */ |
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7 | /** |
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8 | * Cipher Feedback block mode. |
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9 | */ |
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10 | CryptoJS.mode.CFB = (function () { |
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11 | var CFB = CryptoJS.lib.BlockCipherMode.extend(); |
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12 | |||
13 | CFB.Encryptor = CFB.extend({ |
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14 | processBlock: function (words, offset) { |
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15 | // Shortcuts |
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16 | var cipher = this._cipher; |
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17 | var blockSize = cipher.blockSize; |
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18 | |||
19 | generateKeystreamAndEncrypt.call(this, words, offset, blockSize, cipher); |
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20 | |||
21 | // Remember this block to use with next block |
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22 | this._prevBlock = words.slice(offset, offset + blockSize); |
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23 | } |
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24 | }); |
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25 | |||
26 | CFB.Decryptor = CFB.extend({ |
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27 | processBlock: function (words, offset) { |
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28 | // Shortcuts |
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29 | var cipher = this._cipher; |
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30 | var blockSize = cipher.blockSize; |
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31 | |||
32 | // Remember this block to use with next block |
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33 | var thisBlock = words.slice(offset, offset + blockSize); |
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34 | |||
35 | generateKeystreamAndEncrypt.call(this, words, offset, blockSize, cipher); |
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36 | |||
37 | // This block becomes the previous block |
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38 | this._prevBlock = thisBlock; |
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39 | } |
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40 | }); |
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41 | |||
42 | function generateKeystreamAndEncrypt(words, offset, blockSize, cipher) { |
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43 | // Shortcut |
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44 | var iv = this._iv; |
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45 | |||
46 | // Generate keystream |
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47 | if (iv) { |
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48 | var keystream = iv.slice(0); |
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49 | |||
50 | // Remove IV for subsequent blocks |
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51 | this._iv = undefined; |
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52 | } else { |
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53 | var keystream = this._prevBlock; |
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54 | } |
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55 | cipher.encryptBlock(keystream, 0); |
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56 | |||
57 | // Encrypt |
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58 | for (var i = 0; i < blockSize; i++) { |
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59 | words[offset + i] ^= keystream[i]; |
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60 | } |
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61 | } |
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62 | |||
63 | return CFB; |
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64 | }()); |