diff --git a/packages/sdk/src/utils/__tests__/Uint8arrayTool.test.ts b/packages/sdk/src/utils/__tests__/Uint8arrayTool.test.ts
new file mode 100644
index 00000000..c1c5a389
--- /dev/null
+++ b/packages/sdk/src/utils/__tests__/Uint8arrayTool.test.ts
@@ -0,0 +1,28 @@
+import { Uint8arrayTool } from "../binary";
+
+describe("Uint8arrayTool ", () => {
+  it("should be able to convert to hex", () => {
+    const bytes = new Uint8Array([0, 1, 2, 3, 4, 5]);
+    const hex = Uint8arrayTool.toHex(bytes);
+    expect(hex).toBe("000102030405");
+  });
+
+  it("should be able to ensure Uint8Array", () => {
+    const bytes = new Uint8Array([0, 1, 2, 3, 4, 5]);
+    const b64 = "AAECAwQF";
+    const arr = [0, 1, 2, 3, 4, 5];
+    expect(Uint8arrayTool.ensureUint8Array(bytes)).toBe(bytes);
+    expect(Uint8arrayTool.ensureUint8Array(b64)).toEqual(bytes);
+    expect(Uint8arrayTool.ensureUint8Array(arr)).toEqual(bytes);
+  });
+
+  it("should be able to compare bytes", () => {
+    const a = new Uint8Array([0, 1, 2, 3, 4, 5]);
+    const b = new Uint8Array([0, 1, 2, 3, 4, 5]);
+    const c = new Uint8Array([0, 1, 2, 3, 4, 6]);
+    const d = new Uint8Array([0, 1, 2, 3, 4]);
+    expect(Uint8arrayTool.bytesEqual(a, b)).toBe(true);
+    expect(Uint8arrayTool.bytesEqual(a, c)).toBe(false);
+    expect(Uint8arrayTool.bytesEqual(a, d)).toBe(false);
+  });
+});
diff --git a/packages/sdk/src/utils/binary/Uint8arrayTool.ts b/packages/sdk/src/utils/binary/Uint8arrayTool.ts
index a5cfe55f..173bcba9 100644
--- a/packages/sdk/src/utils/binary/Uint8arrayTool.ts
+++ b/packages/sdk/src/utils/binary/Uint8arrayTool.ts
@@ -1,13 +1,13 @@
-import { Buffer } from "buffer";
+import { fromB64, toHEX } from "@mysten/sui/utils";
 
 export class Uint8arrayTool {
   static toHex(bytes: Uint8Array): string {
-    return Buffer.from(bytes).toString("hex");
+    return toHEX(bytes);
   }
 
   static ensureUint8Array(value: string | Uint8Array | number[]): Uint8Array {
     if (typeof value === "string") {
-      return Uint8Array.from(Buffer.from(value, "base64"));
+      return fromB64(value);
     } else if (value instanceof Uint8Array) {
       return value;
     } else {