81 lines
4.2 KiB
JavaScript
81 lines
4.2 KiB
JavaScript
"use strict";
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// Cipher Feedback
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var __classPrivateFieldSet = (this && this.__classPrivateFieldSet) || function (receiver, state, value, kind, f) {
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if (kind === "m") throw new TypeError("Private method is not writable");
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if (kind === "a" && !f) throw new TypeError("Private accessor was defined without a setter");
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if (typeof state === "function" ? receiver !== state || !f : !state.has(receiver)) throw new TypeError("Cannot write private member to an object whose class did not declare it");
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return (kind === "a" ? f.call(receiver, value) : f ? f.value = value : state.set(receiver, value)), value;
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};
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var __classPrivateFieldGet = (this && this.__classPrivateFieldGet) || function (receiver, state, kind, f) {
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if (kind === "a" && !f) throw new TypeError("Private accessor was defined without a getter");
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if (typeof state === "function" ? receiver !== state || !f : !state.has(receiver)) throw new TypeError("Cannot read private member from an object whose class did not declare it");
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return kind === "m" ? f : kind === "a" ? f.call(receiver) : f ? f.value : state.get(receiver);
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};
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var _CFB_instances, _CFB_iv, _CFB_shiftRegister, _CFB_shift;
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.CFB = void 0;
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const mode_js_1 = require("./mode.js");
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class CFB extends mode_js_1.ModeOfOperation {
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constructor(key, iv, segmentSize = 8) {
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super("CFB", key, CFB);
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_CFB_instances.add(this);
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_CFB_iv.set(this, void 0);
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_CFB_shiftRegister.set(this, void 0);
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// This library currently only handles byte-aligned segmentSize
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if (!Number.isInteger(segmentSize) || (segmentSize % 8)) {
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throw new TypeError("invalid segmentSize");
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}
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Object.defineProperties(this, {
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segmentSize: { enumerable: true, value: segmentSize }
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});
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if (iv) {
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if (iv.length % 16) {
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throw new TypeError("invalid iv size (must be 16 bytes)");
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}
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__classPrivateFieldSet(this, _CFB_iv, new Uint8Array(iv), "f");
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}
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else {
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__classPrivateFieldSet(this, _CFB_iv, new Uint8Array(16), "f");
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}
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__classPrivateFieldSet(this, _CFB_shiftRegister, this.iv, "f");
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}
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get iv() { return new Uint8Array(__classPrivateFieldGet(this, _CFB_iv, "f")); }
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encrypt(plaintext) {
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if (8 * plaintext.length % this.segmentSize) {
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throw new TypeError("invalid plaintext size (must be multiple of segmentSize bytes)");
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}
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const segmentSize = this.segmentSize / 8;
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const ciphertext = new Uint8Array(plaintext);
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for (let i = 0; i < ciphertext.length; i += segmentSize) {
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const xorSegment = this.aes.encrypt(__classPrivateFieldGet(this, _CFB_shiftRegister, "f"));
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for (let j = 0; j < segmentSize; j++) {
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ciphertext[i + j] ^= xorSegment[j];
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}
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__classPrivateFieldGet(this, _CFB_instances, "m", _CFB_shift).call(this, ciphertext.subarray(i));
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}
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return ciphertext;
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}
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decrypt(ciphertext) {
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if (8 * ciphertext.length % this.segmentSize) {
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throw new TypeError("invalid ciphertext size (must be multiple of segmentSize bytes)");
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}
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const segmentSize = this.segmentSize / 8;
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const plaintext = new Uint8Array(ciphertext);
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for (let i = 0; i < plaintext.length; i += segmentSize) {
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const xorSegment = this.aes.encrypt(__classPrivateFieldGet(this, _CFB_shiftRegister, "f"));
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for (let j = 0; j < segmentSize; j++) {
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plaintext[i + j] ^= xorSegment[j];
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}
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__classPrivateFieldGet(this, _CFB_instances, "m", _CFB_shift).call(this, ciphertext.subarray(i));
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}
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return plaintext;
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}
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}
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exports.CFB = CFB;
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_CFB_iv = new WeakMap(), _CFB_shiftRegister = new WeakMap(), _CFB_instances = new WeakSet(), _CFB_shift = function _CFB_shift(data) {
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const segmentSize = this.segmentSize / 8;
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// Shift the register
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__classPrivateFieldGet(this, _CFB_shiftRegister, "f").set(__classPrivateFieldGet(this, _CFB_shiftRegister, "f").subarray(segmentSize));
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__classPrivateFieldGet(this, _CFB_shiftRegister, "f").set(data.subarray(0, segmentSize), 16 - segmentSize);
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};
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//# sourceMappingURL=mode-cfb.js.map
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