crypto-es
Version:
A cryptography algorithms library compatible with ES6 and TypeScript
68 lines (66 loc) • 1.76 kB
JavaScript
const require_cipher_core = require('./cipher-core.cjs');
//#region src/mode-ctr-gladman.ts
const incWord = (word) => {
let _word = word;
if ((word >> 24 & 255) === 255) {
let b1 = word >> 16 & 255;
let b2 = word >> 8 & 255;
let b3 = word & 255;
if (b1 === 255) {
b1 = 0;
if (b2 === 255) {
b2 = 0;
if (b3 === 255) b3 = 0;
else b3 += 1;
} else b2 += 1;
} else b1 += 1;
_word = 0;
_word += b1 << 16;
_word += b2 << 8;
_word += b3;
} else _word += 1 << 24;
return _word;
};
const incCounter = (counter) => {
const _counter = counter;
_counter[0] = incWord(_counter[0]);
if (_counter[0] === 0) _counter[1] = incWord(_counter[1]);
return _counter;
};
/**
* CTRGladman Encryptor/Decryptor (same operation)
*/
var CTRGladmanMode = class extends require_cipher_core.BlockCipherMode {
/** Counter for CTR Gladman mode */
_counter;
processBlock(words, offset) {
const _words = words;
const cipher = this._cipher;
const blockSize = cipher.blockSize;
const iv = this._iv;
let counter = this._counter;
if (iv) {
this._counter = iv.slice(0);
counter = this._counter;
this._iv = void 0;
}
incCounter(counter);
const keystream = counter.slice(0);
cipher.encryptBlock(keystream, 0);
for (let i = 0; i < blockSize; i += 1) _words[offset + i] ^= keystream[i];
}
};
/** @preserve
* Counter block mode compatible with Dr Brian Gladman fileenc.c
* derived from CryptoJS.mode.CTR
* Jan Hruby jhruby.web@gmail.com
*/
var CTRGladman = class extends require_cipher_core.BlockCipherMode {
/** Counter for CTR Gladman mode */
_counter;
static Encryptor = CTRGladmanMode;
static Decryptor = CTRGladmanMode;
};
//#endregion
exports.CTRGladman = CTRGladman;
//# sourceMappingURL=mode-ctr-gladman.cjs.map