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node_modules/crypto-js/mode-ctr-gladman.js
| 115 lines
| 2.3 KiB
| application/javascript
| JavascriptLexer
|
| r789 | ;(function (root, factory, undef) { | ||
| if (typeof exports === "object") { | |||
| // CommonJS | |||
| module.exports = exports = factory(require("./core"), require("./cipher-core")); | |||
| } | |||
| else if (typeof define === "function" && define.amd) { | |||
| // AMD | |||
| define(["./core", "./cipher-core"], factory); | |||
| } | |||
| else { | |||
| // Global (browser) | |||
| factory(root.CryptoJS); | |||
| } | |||
| }(this, function (CryptoJS) { | |||
| /** @preserve | |||
| * Counter block mode compatible with Dr Brian Gladman fileenc.c | |||
| * derived from CryptoJS.mode.CTR | |||
| * Jan Hruby jhruby.web@gmail.com | |||
| */ | |||
| CryptoJS.mode.CTRGladman = (function () { | |||
| var CTRGladman = CryptoJS.lib.BlockCipherMode.extend(); | |||
| function incWord(word) | |||
| { | |||
| if (((word >> 24) & 0xff) === 0xff) { //overflow | |||
| var b1 = (word >> 16)&0xff; | |||
| var b2 = (word >> 8)&0xff; | |||
| var b3 = word & 0xff; | |||
| if (b1 === 0xff) // overflow b1 | |||
| { | |||
| b1 = 0; | |||
| if (b2 === 0xff) | |||
| { | |||
| b2 = 0; | |||
| if (b3 === 0xff) | |||
| { | |||
| b3 = 0; | |||
| } | |||
| else | |||
| { | |||
| ++b3; | |||
| } | |||
| } | |||
| else | |||
| { | |||
| ++b2; | |||
| } | |||
| } | |||
| else | |||
| { | |||
| ++b1; | |||
| } | |||
| word = 0; | |||
| word += (b1 << 16); | |||
| word += (b2 << 8); | |||
| word += b3; | |||
| } | |||
| else | |||
| { | |||
| word += (0x01 << 24); | |||
| } | |||
| return word; | |||
| } | |||
| 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; | |||
| } | |||
| 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; | |||
| // Generate keystream | |||
| if (iv) { | |||
| counter = this._counter = iv.slice(0); | |||
| // Remove IV for subsequent blocks | |||
| this._iv = undefined; | |||
| } | |||
| incCounter(counter); | |||
| var keystream = counter.slice(0); | |||
| cipher.encryptBlock(keystream, 0); | |||
| // Encrypt | |||
| for (var i = 0; i < blockSize; i++) { | |||
| words[offset + i] ^= keystream[i]; | |||
| } | |||
| } | |||
| }); | |||
| CTRGladman.Decryptor = Encryptor; | |||
| return CTRGladman; | |||
| }()); | |||
| return CryptoJS.mode.CTRGladman; | |||
| })); |