1 files changed, 34 insertions, 0 deletions
diff --git a/static/solver.js b/static/solver.js
new file mode 100644
index 0000000..a3f8366
--- /dev/null
+++ b/static/solver.js
@@ -0,0 +1,34 @@
+let wasm_instance = null;
+let wasm_exports = null;
+
+async function load_wasm() {
+	let response = await fetch("/.powxy/wasm/solver.wasm");
+	let { instance } = await WebAssembly.instantiateStreaming(response, {
+		env: {
+			memory: new WebAssembly.Memory({ initial: 1 })
+		}
+	});
+	wasm_instance = instance;
+	wasm_exports = instance.exports;
+}
+
+onmessage = async function(e) {
+	let { identifier_bytes, difficulty } = e.data;
+
+	if (!wasm_instance) {
+		await load_wasm();
+	}
+
+	let ptr = wasm_exports.get_challenge_ptr();
+	let memory = new Uint8Array(wasm_instance.exports.memory.buffer, ptr, 32);
+	memory.set(identifier_bytes);
+
+	let nonce = wasm_exports.solve(difficulty);
+
+	let buf = new ArrayBuffer(8);
+	let view = new DataView(buf);
+	view.setBigUint64(0, BigInt(nonce), true);
+	let nonce_bytes = new Uint8Array(buf);
+
+	postMessage({ nonce, nonce_bytes });
+};