feat: Replace aCAPTCHA with official ALTCHA (altcha.org) Proof-of-Work web component widget

2026-07-31 11:39:29 +02:00
parent 6ef74c7cf4
commit 83c782c469
417 changed files with 100543 additions and 317 deletions
@@ -0,0 +1,84 @@
+import wasmJson from "../wasm/sha3.wasm.json";
+import {
+	type IHasher,
+	type IWASMInterface,
+	WASMInterface,
+} from "./WASMInterface";
+import lockedCreate from "./lockedCreate";
+import Mutex from "./mutex";
+import type { IDataType } from "./util";
+
+type IValidBits = 224 | 256 | 384 | 512;
+const mutex = new Mutex();
+let wasmCache: IWASMInterface = null;
+
+function validateBits(bits: IValidBits) {
+	if (![224, 256, 384, 512].includes(bits)) {
+		return new Error("Invalid variant! Valid values: 224, 256, 384, 512");
+	}
+	return null;
+}
+
+/**
+ * Calculates SHA-3 hash
+ * @param data Input data (string, Buffer or TypedArray)
+ * @param bits Number of output bits. Valid values: 224, 256, 384, 512
+ * @returns Computed hash as a hexadecimal string
+ */
+export function sha3(data: IDataType, bits: IValidBits = 512): Promise<string> {
+	if (validateBits(bits)) {
+		return Promise.reject(validateBits(bits));
+	}
+
+	const hashLength = bits / 8;
+
+	if (wasmCache === null || wasmCache.hashLength !== hashLength) {
+		return lockedCreate(mutex, wasmJson, hashLength).then((wasm) => {
+			wasmCache = wasm;
+			return wasmCache.calculate(data, bits, 0x06);
+		});
+	}
+
+	try {
+		const hash = wasmCache.calculate(data, bits, 0x06);
+		return Promise.resolve(hash);
+	} catch (err) {
+		return Promise.reject(err);
+	}
+}
+
+/**
+ * Creates a new SHA-3 hash instance
+ * @param bits Number of output bits. Valid values: 224, 256, 384, 512
+ */
+export function createSHA3(bits: IValidBits = 512): Promise<IHasher> {
+	if (validateBits(bits)) {
+		return Promise.reject(validateBits(bits));
+	}
+
+	const outputSize = bits / 8;
+
+	return WASMInterface(wasmJson, outputSize).then((wasm) => {
+		wasm.init(bits);
+		const obj: IHasher = {
+			init: () => {
+				wasm.init(bits);
+				return obj;
+			},
+			update: (data) => {
+				wasm.update(data);
+				return obj;
+			},
+			// biome-ignore lint/suspicious/noExplicitAny: Conflict with IHasher type
+			digest: (outputType) => wasm.digest(outputType, 0x06) as any,
+			save: () => wasm.save(),
+			load: (data) => {
+				wasm.load(data);
+				return obj;
+			},
+			blockSize: 200 - 2 * outputSize,
+			digestSize: outputSize,
+		};
+		return obj;
+	});
+}