implement creation of link on first step in backend

assets/js/utils/hexmix.ts

@@ -0,0 +1,33 @@
+export default {
+    uint8ToHex(data: Uint8Array): string {
+      return Array.prototype.map.call(data, (byte: number) => {
+        return ('00' + byte.toString(16)).slice(-2);
+      }).join('');
+    },  
+    hexToUint8(data: string): Uint8Array {
+      const hexArray = data.match(/.{1,2}/g);
+      if (!hexArray) return new Uint8Array(0);
+  
+      return Uint8Array.from(hexArray.map((char: string) => {
+        return parseInt(char, 16)
+      }));
+    },
+    arrayBufferToString(buf: ArrayBuffer, callback: Function) {
+      const reader = new FileReader();
+      reader.onload = function (event: ProgressEvent<FileReader>) {
+        callback(event?.target?.result);
+      };
+      reader.onerror = function (event: ProgressEvent<FileReader>) {
+        alert(event?.target?.error);
+      };
+      reader.readAsBinaryString(new Blob([ buf ],
+        { type: 'application/octet-stream' }));
+    },
+    stringToArrayBuffer(str: string) {
+      const array = new Uint8Array(str.length);
+      for(let i = 0; i < str.length; i++) {
+        array[i] = str.charCodeAt(i);
+      }
+      return array.buffer
+    }
+  }