Implement initial mint_by_key logic for Badge Actions

utils/hash.ts

@@ -0,0 +1,8 @@
+/* eslint-disable eslint-comments/disable-enable-pair */
+
+import { Word32Array } from 'jscrypto'
+import { SHA256 } from 'jscrypto/SHA256'
+
+export function sha256(data: Buffer): Buffer {
+  return Buffer.from(SHA256.hash(new Word32Array(data)).toUint8Array())
+}