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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 StreamCipher = C_lib.StreamCipher; |
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12 | var C_algo = C.algo; |
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13 | |||
14 | // Reusable objects |
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15 | var S = []; |
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16 | var C_ = []; |
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17 | var G = []; |
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18 | |||
19 | /** |
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20 | * Rabbit stream cipher algorithm. |
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21 | * |
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22 | * This is a legacy version that neglected to convert the key to little-endian. |
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23 | * This error doesn't affect the cipher's security, |
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24 | * but it does affect its compatibility with other implementations. |
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25 | */ |
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26 | var RabbitLegacy = C_algo.RabbitLegacy = StreamCipher.extend({ |
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27 | _doReset: function () { |
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28 | // Shortcuts |
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29 | var K = this._key.words; |
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30 | var iv = this.cfg.iv; |
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31 | |||
32 | // Generate initial state values |
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33 | var X = this._X = [ |
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34 | K[0], (K[3] << 16) | (K[2] >>> 16), |
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35 | K[1], (K[0] << 16) | (K[3] >>> 16), |
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36 | K[2], (K[1] << 16) | (K[0] >>> 16), |
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37 | K[3], (K[2] << 16) | (K[1] >>> 16) |
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38 | ]; |
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39 | |||
40 | // Generate initial counter values |
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41 | var C = this._C = [ |
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42 | (K[2] << 16) | (K[2] >>> 16), (K[0] & 0xffff0000) | (K[1] & 0x0000ffff), |
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43 | (K[3] << 16) | (K[3] >>> 16), (K[1] & 0xffff0000) | (K[2] & 0x0000ffff), |
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44 | (K[0] << 16) | (K[0] >>> 16), (K[2] & 0xffff0000) | (K[3] & 0x0000ffff), |
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45 | (K[1] << 16) | (K[1] >>> 16), (K[3] & 0xffff0000) | (K[0] & 0x0000ffff) |
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46 | ]; |
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47 | |||
48 | // Carry bit |
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49 | this._b = 0; |
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50 | |||
51 | // Iterate the system four times |
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52 | for (var i = 0; i < 4; i++) { |
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53 | nextState.call(this); |
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54 | } |
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55 | |||
56 | // Modify the counters |
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57 | for (var i = 0; i < 8; i++) { |
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58 | C[i] ^= X[(i + 4) & 7]; |
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59 | } |
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60 | |||
61 | // IV setup |
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62 | if (iv) { |
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63 | // Shortcuts |
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64 | var IV = iv.words; |
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65 | var IV_0 = IV[0]; |
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66 | var IV_1 = IV[1]; |
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67 | |||
68 | // Generate four subvectors |
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69 | var i0 = (((IV_0 << 8) | (IV_0 >>> 24)) & 0x00ff00ff) | (((IV_0 << 24) | (IV_0 >>> 8)) & 0xff00ff00); |
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70 | var i2 = (((IV_1 << 8) | (IV_1 >>> 24)) & 0x00ff00ff) | (((IV_1 << 24) | (IV_1 >>> 8)) & 0xff00ff00); |
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71 | var i1 = (i0 >>> 16) | (i2 & 0xffff0000); |
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72 | var i3 = (i2 << 16) | (i0 & 0x0000ffff); |
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73 | |||
74 | // Modify counter values |
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75 | C[0] ^= i0; |
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76 | C[1] ^= i1; |
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77 | C[2] ^= i2; |
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78 | C[3] ^= i3; |
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79 | C[4] ^= i0; |
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80 | C[5] ^= i1; |
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81 | C[6] ^= i2; |
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82 | C[7] ^= i3; |
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83 | |||
84 | // Iterate the system four times |
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85 | for (var i = 0; i < 4; i++) { |
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86 | nextState.call(this); |
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87 | } |
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88 | } |
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89 | }, |
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90 | |||
91 | _doProcessBlock: function (M, offset) { |
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92 | // Shortcut |
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93 | var X = this._X; |
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94 | |||
95 | // Iterate the system |
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96 | nextState.call(this); |
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97 | |||
98 | // Generate four keystream words |
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99 | S[0] = X[0] ^ (X[5] >>> 16) ^ (X[3] << 16); |
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100 | S[1] = X[2] ^ (X[7] >>> 16) ^ (X[5] << 16); |
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101 | S[2] = X[4] ^ (X[1] >>> 16) ^ (X[7] << 16); |
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102 | S[3] = X[6] ^ (X[3] >>> 16) ^ (X[1] << 16); |
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103 | |||
104 | for (var i = 0; i < 4; i++) { |
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105 | // Swap endian |
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106 | S[i] = (((S[i] << 8) | (S[i] >>> 24)) & 0x00ff00ff) | |
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107 | (((S[i] << 24) | (S[i] >>> 8)) & 0xff00ff00); |
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108 | |||
109 | // Encrypt |
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110 | M[offset + i] ^= S[i]; |
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111 | } |
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112 | }, |
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113 | |||
114 | blockSize: 128/32, |
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115 | |||
116 | ivSize: 64/32 |
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117 | }); |
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118 | |||
119 | function nextState() { |
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120 | // Shortcuts |
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121 | var X = this._X; |
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122 | var C = this._C; |
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123 | |||
124 | // Save old counter values |
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125 | for (var i = 0; i < 8; i++) { |
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126 | C_[i] = C[i]; |
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127 | } |
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128 | |||
129 | // Calculate new counter values |
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130 | C[0] = (C[0] + 0x4d34d34d + this._b) | 0; |
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131 | C[1] = (C[1] + 0xd34d34d3 + ((C[0] >>> 0) < (C_[0] >>> 0) ? 1 : 0)) | 0; |
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132 | C[2] = (C[2] + 0x34d34d34 + ((C[1] >>> 0) < (C_[1] >>> 0) ? 1 : 0)) | 0; |
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133 | C[3] = (C[3] + 0x4d34d34d + ((C[2] >>> 0) < (C_[2] >>> 0) ? 1 : 0)) | 0; |
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134 | C[4] = (C[4] + 0xd34d34d3 + ((C[3] >>> 0) < (C_[3] >>> 0) ? 1 : 0)) | 0; |
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135 | C[5] = (C[5] + 0x34d34d34 + ((C[4] >>> 0) < (C_[4] >>> 0) ? 1 : 0)) | 0; |
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136 | C[6] = (C[6] + 0x4d34d34d + ((C[5] >>> 0) < (C_[5] >>> 0) ? 1 : 0)) | 0; |
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137 | C[7] = (C[7] + 0xd34d34d3 + ((C[6] >>> 0) < (C_[6] >>> 0) ? 1 : 0)) | 0; |
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138 | this._b = (C[7] >>> 0) < (C_[7] >>> 0) ? 1 : 0; |
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139 | |||
140 | // Calculate the g-values |
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141 | for (var i = 0; i < 8; i++) { |
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142 | var gx = X[i] + C[i]; |
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143 | |||
144 | // Construct high and low argument for squaring |
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145 | var ga = gx & 0xffff; |
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146 | var gb = gx >>> 16; |
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147 | |||
148 | // Calculate high and low result of squaring |
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149 | var gh = ((((ga * ga) >>> 17) + ga * gb) >>> 15) + gb * gb; |
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150 | var gl = (((gx & 0xffff0000) * gx) | 0) + (((gx & 0x0000ffff) * gx) | 0); |
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151 | |||
152 | // High XOR low |
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153 | G[i] = gh ^ gl; |
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154 | } |
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155 | |||
156 | // Calculate new state values |
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157 | X[0] = (G[0] + ((G[7] << 16) | (G[7] >>> 16)) + ((G[6] << 16) | (G[6] >>> 16))) | 0; |
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158 | X[1] = (G[1] + ((G[0] << 8) | (G[0] >>> 24)) + G[7]) | 0; |
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159 | X[2] = (G[2] + ((G[1] << 16) | (G[1] >>> 16)) + ((G[0] << 16) | (G[0] >>> 16))) | 0; |
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160 | X[3] = (G[3] + ((G[2] << 8) | (G[2] >>> 24)) + G[1]) | 0; |
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161 | X[4] = (G[4] + ((G[3] << 16) | (G[3] >>> 16)) + ((G[2] << 16) | (G[2] >>> 16))) | 0; |
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162 | X[5] = (G[5] + ((G[4] << 8) | (G[4] >>> 24)) + G[3]) | 0; |
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163 | X[6] = (G[6] + ((G[5] << 16) | (G[5] >>> 16)) + ((G[4] << 16) | (G[4] >>> 16))) | 0; |
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164 | X[7] = (G[7] + ((G[6] << 8) | (G[6] >>> 24)) + G[5]) | 0; |
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165 | } |
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166 | |||
167 | /** |
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168 | * Shortcut functions to the cipher's object interface. |
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169 | * |
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170 | * @example |
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171 | * |
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172 | * var ciphertext = CryptoJS.RabbitLegacy.encrypt(message, key, cfg); |
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173 | * var plaintext = CryptoJS.RabbitLegacy.decrypt(ciphertext, key, cfg); |
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174 | */ |
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175 | C.RabbitLegacy = StreamCipher._createHelper(RabbitLegacy); |
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176 | }()); |