Initial commit

sha256.js

@@ -0,0 +1,4 @@
+async function sha256(message) {
+    const hashBuffer = await crypto.subtle.digest('SHA-256', new TextEncoder('utf-8').encode(message));
+    return Array.from(new Uint8Array(hashBuffer)).map(b => ('00' + b.toString(16)).slice(-2)).join('');
+}