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

frontend/node_modules/hash-wasm/lib/crc32.ts

@@ -0,0 +1,82 @@
+import wasmJson from "../wasm/crc32.wasm.json";
+import {
+	type IHasher,
+	type IWASMInterface,
+	WASMInterface,
+} from "./WASMInterface";
+import lockedCreate from "./lockedCreate";
+import Mutex from "./mutex";
+import type { IDataType } from "./util";
+
+const mutex = new Mutex();
+let wasmCache: IWASMInterface = null;
+
+function validatePoly(poly: number) {
+	if (!Number.isInteger(poly) || poly < 0 || poly > 0xffffffff) {
+		return new Error("Polynomial must be a valid 32-bit long unsigned integer");
+	}
+	return null;
+}
+
+/**
+ * Calculates CRC-32 hash
+ * @param data Input data (string, Buffer or TypedArray)
+ * @param polynomial Input polynomial (defaults to 0xedb88320, for CRC32C use 0x82f63b78)
+ * @returns Computed hash as a hexadecimal string
+ */
+export function crc32(
+	data: IDataType,
+	polynomial = 0xedb88320,
+): Promise<string> {
+	if (validatePoly(polynomial)) {
+		return Promise.reject(validatePoly(polynomial));
+	}
+
+	if (wasmCache === null) {
+		return lockedCreate(mutex, wasmJson, 4).then((wasm) => {
+			wasmCache = wasm;
+			return wasmCache.calculate(data, polynomial);
+		});
+	}
+
+	try {
+		const hash = wasmCache.calculate(data, polynomial);
+		return Promise.resolve(hash);
+	} catch (err) {
+		return Promise.reject(err);
+	}
+}
+
+/**
+ * Creates a new CRC-32 hash instance
+ * @param polynomial Input polynomial (defaults to 0xedb88320, for CRC32C use 0x82f63b78)
+ */
+export function createCRC32(polynomial = 0xedb88320): Promise<IHasher> {
+	if (validatePoly(polynomial)) {
+		return Promise.reject(validatePoly(polynomial));
+	}
+
+	return WASMInterface(wasmJson, 4).then((wasm) => {
+		wasm.init(polynomial);
+		const obj: IHasher = {
+			init: () => {
+				wasm.init(polynomial);
+				return obj;
+			},
+			update: (data) => {
+				wasm.update(data);
+				return obj;
+			},
+			// biome-ignore lint/suspicious/noExplicitAny: Conflict with IHasher type
+			digest: (outputType) => wasm.digest(outputType) as any,
+			save: () => wasm.save(),
+			load: (data) => {
+				wasm.load(data);
+				return obj;
+			},
+			blockSize: 4,
+			digestSize: 4,
+		};
+		return obj;
+	});
+}