82 lines
4.1 KiB
JavaScript
82 lines
4.1 KiB
JavaScript
// Counter Mode
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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 _CTR_remaining, _CTR_remainingIndex, _CTR_counter;
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import { ModeOfOperation } from "./mode.js";
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export class CTR extends ModeOfOperation {
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constructor(key, initialValue) {
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super("CTR", key, CTR);
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// Remaining bytes for the one-time pad
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_CTR_remaining.set(this, void 0);
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_CTR_remainingIndex.set(this, void 0);
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// The current counter
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_CTR_counter.set(this, void 0);
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__classPrivateFieldSet(this, _CTR_counter, new Uint8Array(16), "f");
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__classPrivateFieldGet(this, _CTR_counter, "f").fill(0);
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__classPrivateFieldSet(this, _CTR_remaining, __classPrivateFieldGet(this, _CTR_counter, "f"), "f"); // This will be discarded immediately
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__classPrivateFieldSet(this, _CTR_remainingIndex, 16, "f");
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if (initialValue == null) {
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initialValue = 1;
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}
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if (typeof (initialValue) === "number") {
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this.setCounterValue(initialValue);
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}
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else {
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this.setCounterBytes(initialValue);
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}
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}
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get counter() { return new Uint8Array(__classPrivateFieldGet(this, _CTR_counter, "f")); }
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setCounterValue(value) {
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if (!Number.isInteger(value) || value < 0 || value > Number.MAX_SAFE_INTEGER) {
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throw new TypeError("invalid counter initial integer value");
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}
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for (let index = 15; index >= 0; --index) {
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__classPrivateFieldGet(this, _CTR_counter, "f")[index] = value % 256;
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value = Math.floor(value / 256);
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}
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}
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setCounterBytes(value) {
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if (value.length !== 16) {
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throw new TypeError("invalid counter initial Uint8Array value length");
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}
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__classPrivateFieldGet(this, _CTR_counter, "f").set(value);
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}
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increment() {
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for (let i = 15; i >= 0; i--) {
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if (__classPrivateFieldGet(this, _CTR_counter, "f")[i] === 255) {
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__classPrivateFieldGet(this, _CTR_counter, "f")[i] = 0;
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}
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else {
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__classPrivateFieldGet(this, _CTR_counter, "f")[i]++;
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break;
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}
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}
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}
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encrypt(plaintext) {
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var _a, _b;
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const crypttext = new Uint8Array(plaintext);
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for (let i = 0; i < crypttext.length; i++) {
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if (__classPrivateFieldGet(this, _CTR_remainingIndex, "f") === 16) {
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__classPrivateFieldSet(this, _CTR_remaining, this.aes.encrypt(__classPrivateFieldGet(this, _CTR_counter, "f")), "f");
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__classPrivateFieldSet(this, _CTR_remainingIndex, 0, "f");
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this.increment();
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}
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crypttext[i] ^= __classPrivateFieldGet(this, _CTR_remaining, "f")[__classPrivateFieldSet(this, _CTR_remainingIndex, (_b = __classPrivateFieldGet(this, _CTR_remainingIndex, "f"), _a = _b++, _b), "f"), _a];
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}
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return crypttext;
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}
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decrypt(ciphertext) {
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return this.encrypt(ciphertext);
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}
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}
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_CTR_remaining = new WeakMap(), _CTR_remainingIndex = new WeakMap(), _CTR_counter = new WeakMap();
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//# sourceMappingURL=mode-ctr.js.map
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