Initial commit.

client/nojscap.js

@@ -0,0 +1,57 @@
+const crypto = require('crypto');
+
+function checkDifficulty(hashBuffer, difficultyBits) {
+    let bits = difficultyBits;
+    let i = 0;
+    while (bits > 0) {
+        const byte = hashBuffer[i];
+        if (bits >= 8) {
+            if (byte !== 0) return false;
+            bits -= 8;
+        } else {
+            const mask = 0xFF << (8 - bits);
+            if ((byte & mask) !== 0) return false;
+            bits = 0;
+        }
+        i++;
+    }
+    return true;
+}
+
+function main() {
+    if (process.argv.length !== 4) {
+        console.error(`Usage: node ${process.argv[1]} <challenge_string> <difficulty_bits>`);
+        process.exit(1);
+    }
+
+    const challenge = process.argv[2];
+    const difficultyBits = parseInt(process.argv[3], 10);
+
+    if (isNaN(difficultyBits) || difficultyBits <= 0 || difficultyBits > 256) {
+        console.error('Difficulty bits must be a number between 1 and 256');
+        process.exit(1);
+    }
+
+    let counter = 0;
+
+    while (true) {
+        const input = challenge + counter;
+        const hash = crypto.createHash('sha256').update(input).digest();
+
+        if (checkDifficulty(hash, difficultyBits)) {
+            console.log('===================');
+            console.log(`Found nonce: ${counter}`);
+            console.log('===================');
+            console.log(`Hash: ${hash.toString('hex')}`);
+            break;
+        }
+
+        if ((counter & 0xFFFFF) === 0) {
+            console.log(`Attempts: ${counter}`);
+        }
+
+        counter++;
+    }
+}
+
+main();