lib: enable wasm based check validation

Signed-off-by: Xe Iaso <me@xeiaso.net>

web/js/algos/argon2id.mjs

@@ -0,0 +1,159 @@
+import { u } from "../xeact.mjs";
+
+export default function process(
+  data,
+  difficulty = 16,
+  signal = null,
+  pc = null,
+  threads = (navigator.hardwareConcurrency || 1),
+) {
+  return new Promise(async (resolve, reject) => {
+    let webWorkerURL = URL.createObjectURL(new Blob([
+      '(', processTask(), ')()'
+    ], { type: 'application/javascript' }));
+
+    const module = await fetch(u("/.within.website/x/cmd/anubis/static/wasm/argon2id.wasm"))
+      .then(resp => WebAssembly.compileStreaming(resp));
+
+    const workers = [];
+    const terminate = () => {
+      workers.forEach((w) => w.terminate());
+      if (signal != null) {
+        // clean up listener to avoid memory leak
+        signal.removeEventListener("abort", terminate);
+        if (signal.aborted) {
+          console.log("PoW aborted");
+          reject(false);
+        }
+      }
+    };
+    if (signal != null) {
+      signal.addEventListener("abort", terminate, { once: true });
+    }
+
+    for (let i = 0; i < threads; i++) {
+      let worker = new Worker(webWorkerURL);
+
+      worker.onmessage = (event) => {
+        if (typeof event.data === "number") {
+          pc?.(event.data);
+        } else {
+          terminate();
+          resolve(event.data);
+        }
+      };
+
+      worker.onerror = (event) => {
+        terminate();
+        reject(event);
+      };
+
+      worker.postMessage({
+        data,
+        difficulty,
+        nonce: i,
+        threads,
+        module,
+      });
+
+      workers.push(worker);
+    }
+
+    URL.revokeObjectURL(webWorkerURL);
+  });
+}
+
+function processTask() {
+  return function () {
+    addEventListener('message', async (event) => {
+      const importObject = {
+        anubis: {
+          anubis_update_nonce: (nonce) => postMessage(nonce),
+        }
+      };
+
+      const instance = await WebAssembly.instantiate(event.data.module, importObject);
+
+      // Get exports
+      const {
+        anubis_work,
+        data_ptr,
+        result_hash_ptr,
+        result_hash_size,
+        set_data_length,
+        memory
+      } = instance.exports;
+
+      function uint8ArrayToHex(arr) {
+        return Array.from(arr)
+          .map((c) => c.toString(16).padStart(2, "0"))
+          .join("");
+      }
+
+      function hexToUint8Array(hexString) {
+        // Remove whitespace and optional '0x' prefix
+        hexString = hexString.replace(/\s+/g, '').replace(/^0x/, '');
+
+        // Check for valid length
+        if (hexString.length % 2 !== 0) {
+          throw new Error('Invalid hex string length');
+        }
+
+        // Check for valid characters
+        if (!/^[0-9a-fA-F]+$/.test(hexString)) {
+          throw new Error('Invalid hex characters');
+        }
+
+        // Convert to Uint8Array
+        const byteArray = new Uint8Array(hexString.length / 2);
+        for (let i = 0; i < byteArray.length; i++) {
+          const byteValue = parseInt(hexString.substr(i * 2, 2), 16);
+          byteArray[i] = byteValue;
+        }
+
+        return byteArray;
+      }
+
+      // Write data to buffer
+      function writeToBuffer(data) {
+        if (data.length > 1024) throw new Error("Data exceeds buffer size");
+
+        // Get pointer and create view
+        const offset = data_ptr();
+        const buffer = new Uint8Array(memory.buffer, offset, data.length);
+
+        // Copy data
+        buffer.set(data);
+
+        // Set data length
+        set_data_length(data.length);
+      }
+
+      function readFromChallenge() {
+        const offset = result_hash_ptr();
+        const buffer = new Uint8Array(memory.buffer, offset, result_hash_size());
+
+        return buffer;
+      }
+
+      let data = event.data.data;
+      let difficulty = event.data.difficulty;
+      let nonce = event.data.nonce;
+      let interand = event.data.threads;
+
+      writeToBuffer(hexToUint8Array(data));
+
+      nonce = anubis_work(difficulty, nonce, interand);
+      const challenge = readFromChallenge();
+
+      data = uint8ArrayToHex(challenge);
+
+      postMessage({
+        hash: data,
+        difficulty,
+        nonce,
+      });
+    });
+  }.toString();
+}
+

web/js/algos/sha256.mjs

@@ -138,7 +138,6 @@ function processTask() {
 
       let data = event.data.data;
       let difficulty = event.data.difficulty;
-      let hash;
       let nonce = event.data.nonce;
       let interand = event.data.threads;