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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 | (function () { |
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8 | // Shortcuts |
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9 | var C = CryptoJS; |
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10 | var C_lib = C.lib; |
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11 | var WordArray = C_lib.WordArray; |
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12 | var C_enc = C.enc; |
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13 | |||
14 | /** |
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15 | * Base64 encoding strategy. |
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16 | */ |
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17 | var Base64 = C_enc.Base64 = { |
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18 | /** |
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19 | * Converts a word array to a Base64 string. |
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20 | * |
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21 | * @param {WordArray} wordArray The word array. |
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22 | * |
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23 | * @return {string} The Base64 string. |
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24 | * |
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25 | * @static |
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26 | * |
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27 | * @example |
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28 | * |
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29 | * var base64String = CryptoJS.enc.Base64.stringify(wordArray); |
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30 | */ |
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31 | stringify: function (wordArray) { |
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32 | // Shortcuts |
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33 | var words = wordArray.words; |
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34 | var sigBytes = wordArray.sigBytes; |
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35 | var map = this._map; |
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36 | |||
37 | // Clamp excess bits |
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38 | wordArray.clamp(); |
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39 | |||
40 | // Convert |
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41 | var base64Chars = []; |
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42 | for (var i = 0; i < sigBytes; i += 3) { |
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43 | var byte1 = (words[i >>> 2] >>> (24 - (i % 4) * 8)) & 0xff; |
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44 | var byte2 = (words[(i + 1) >>> 2] >>> (24 - ((i + 1) % 4) * 8)) & 0xff; |
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45 | var byte3 = (words[(i + 2) >>> 2] >>> (24 - ((i + 2) % 4) * 8)) & 0xff; |
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46 | |||
47 | var triplet = (byte1 << 16) | (byte2 << 8) | byte3; |
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48 | |||
49 | for (var j = 0; (j < 4) && (i + j * 0.75 < sigBytes); j++) { |
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50 | base64Chars.push(map.charAt((triplet >>> (6 * (3 - j))) & 0x3f)); |
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51 | } |
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52 | } |
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53 | |||
54 | // Add padding |
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55 | var paddingChar = map.charAt(64); |
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56 | if (paddingChar) { |
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57 | while (base64Chars.length % 4) { |
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58 | base64Chars.push(paddingChar); |
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59 | } |
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60 | } |
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61 | |||
62 | return base64Chars.join(''); |
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63 | }, |
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64 | |||
65 | /** |
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66 | * Converts a Base64 string to a word array. |
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67 | * |
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68 | * @param {string} base64Str The Base64 string. |
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69 | * |
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70 | * @return {WordArray} The word array. |
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71 | * |
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72 | * @static |
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73 | * |
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74 | * @example |
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75 | * |
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76 | * var wordArray = CryptoJS.enc.Base64.parse(base64String); |
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77 | */ |
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78 | parse: function (base64Str) { |
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79 | // Shortcuts |
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80 | var base64StrLength = base64Str.length; |
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81 | var map = this._map; |
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82 | |||
83 | // Ignore padding |
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84 | var paddingChar = map.charAt(64); |
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85 | if (paddingChar) { |
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86 | var paddingIndex = base64Str.indexOf(paddingChar); |
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87 | if (paddingIndex != -1) { |
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88 | base64StrLength = paddingIndex; |
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89 | } |
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90 | } |
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91 | |||
92 | // Convert |
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93 | var words = []; |
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94 | var nBytes = 0; |
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95 | for (var i = 0; i < base64StrLength; i++) { |
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96 | if (i % 4) { |
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97 | var bits1 = map.indexOf(base64Str.charAt(i - 1)) << ((i % 4) * 2); |
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98 | var bits2 = map.indexOf(base64Str.charAt(i)) >>> (6 - (i % 4) * 2); |
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99 | words[nBytes >>> 2] |= (bits1 | bits2) << (24 - (nBytes % 4) * 8); |
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100 | nBytes++; |
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101 | } |
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102 | } |
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103 | |||
104 | return WordArray.create(words, nBytes); |
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105 | }, |
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106 | |||
107 | _map: 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=' |
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108 | }; |
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109 | }()); |