wrapper for the native sha-256 algorithm

modules/sha-256.js

@@ -0,0 +1,36 @@
+
+
+let binaryToHex = function(buffer) {
+    let result = '';
+
+    // choose chunk size
+    if (buffer.length * 8 % 32 === 0) {
+        buffer = new Uint32Array(buffer);
+    } else if (buffer.length * 8 % 16 === 0) {
+        buffer = new Uint16Array(buffer);
+    } else {
+        buffer = new Uint8Array(buffer);
+    }
+
+    buffer.forEach(chunk => {
+        chunk = chunk.toString(16);
+
+        while (chunk.length < (buffer.BYTES_PER_ELEMENT * 2)) {
+            chunk = '0' + chunk;
+        }
+
+        result += chunk;
+    });
+
+    return result;
+}
+
+export const sha256Native = function(data) {
+    if (typeof data === 'string') {
+        data = (new TextEncoder('utf-8')).encode(data);
+    }
+
+    return window.crypto.subtle.digest('SHA-256', data).then(hashBuffer => {
+        return binaryToHex(hashBuffer);
+    });
+}