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/* | ||
CryptoJS v3.1.2 | ||
code.google.com/p/crypto-js | ||
(c) 2009-2013 by Jeff Mott. All rights reserved. | ||
code.google.com/p/crypto-js/wiki/License | ||
*/ | ||
/* | ||
Counter block mode compatible with Dr Brian Gladman fileenc.c | ||
derived from CryptoJS.mode.CTR | ||
Jan Hruby [email protected] | ||
*/ | ||
CryptoJS.mode.CTRGladman=function(){function h(a){if(255===(a>>24&255)){var c=a>>16&255,b=a>>8&255,e=a&255;255===c?(c=0,255===b?(b=0,255===e?e=0:++e):++b):++c;a=0+(c<<16)+(b<<8);a+=e}else a+=16777216;return a}var g=CryptoJS.lib.BlockCipherMode.extend(),j=g.Encryptor=g.extend({processBlock:function(a,c){var b=this._cipher,e=b.blockSize,d=this._iv,f=this._counter;d&&(f=this._counter=d.slice(0),this._iv=void 0);d=f;if(0===(d[0]=h(d[0])))d[1]=h(d[1]);f=f.slice(0);b.encryptBlock(f,0);for(b=0;b<e;b++)a[c+ | ||
b]^=f[b]}});g.Decryptor=j;return g}(); |
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/* | ||
CryptoJS v3.1.2 | ||
code.google.com/p/crypto-js | ||
(c) 2009-2013 by Jeff Mott. All rights reserved. | ||
code.google.com/p/crypto-js/wiki/License | ||
*/ | ||
/** @preserve | ||
* Counter block mode compatible with Dr Brian Gladman fileenc.c | ||
* derived from CryptoJS.mode.CTR | ||
* Jan Hruby [email protected] | ||
*/ | ||
CryptoJS.mode.CTRGladman = (function () { | ||
var CTRGladman = CryptoJS.lib.BlockCipherMode.extend(); | ||
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function incWord(word) | ||
{ | ||
if (((word >> 24) & 0xff) === 0xff) { //overflow | ||
var b1 = (word >> 16)&0xff; | ||
var b2 = (word >> 8)&0xff; | ||
var b3 = word & 0xff; | ||
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if (b1 === 0xff) // overflow b1 | ||
{ | ||
b1 = 0; | ||
if (b2 === 0xff) | ||
{ | ||
b2 = 0; | ||
if (b3 === 0xff) | ||
{ | ||
b3 = 0; | ||
} | ||
else | ||
{ | ||
++b3; | ||
} | ||
} | ||
else | ||
{ | ||
++b2; | ||
} | ||
} | ||
else | ||
{ | ||
++b1; | ||
} | ||
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word = 0; | ||
word += (b1 << 16); | ||
word += (b2 << 8); | ||
word += b3; | ||
} | ||
else | ||
{ | ||
word += (0x01 << 24); | ||
} | ||
return word; | ||
} | ||
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function incCounter(counter) | ||
{ | ||
if ((counter[0] = incWord(counter[0])) === 0) | ||
{ | ||
// encr_data in fileenc.c from Dr Brian Gladman's counts only with DWORD j < 8 | ||
counter[1] = incWord(counter[1]); | ||
} | ||
return counter; | ||
} | ||
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var Encryptor = CTRGladman.Encryptor = CTRGladman.extend({ | ||
processBlock: function (words, offset) { | ||
// Shortcuts | ||
var cipher = this._cipher | ||
var blockSize = cipher.blockSize; | ||
var iv = this._iv; | ||
var counter = this._counter; | ||
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// Generate keystream | ||
if (iv) { | ||
counter = this._counter = iv.slice(0); | ||
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// Remove IV for subsequent blocks | ||
this._iv = undefined; | ||
} | ||
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incCounter(counter); | ||
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var keystream = counter.slice(0); | ||
cipher.encryptBlock(keystream, 0); | ||
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// Encrypt | ||
for (var i = 0; i < blockSize; i++) { | ||
words[offset + i] ^= keystream[i]; | ||
} | ||
} | ||
}); | ||
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CTRGladman.Decryptor = Encryptor; | ||
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return CTRGladman; | ||
}()); | ||
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