完善使用worker进行加密解密相关代码

src/worker/sm4_encrypt.js

@@ -0,0 +1,11 @@
+import { sm4 } from 'sm-crypto'
+
+self.onmessage = async function (event) {
+    const data = event.data.data
+    const key = event.data.key
+    const encryptData = sm4.encrypt(data, key, {
+        padding: 'pkcs#7',
+        output: 'array'
+    })
+    self.postMessage(new Uint8Array(encryptData))
+}