diff --git a/Cargo.toml b/Cargo.toml
index a2dc745..3a23e94 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "hmac-sm3"
-version = "0.1.0"
+version = "0.1.1"
 edition = "2021"
 authors = ["Hatter Jiang"]
 repository = "https://git.hatter.ink/hatter/hmac-sm3"
@@ -14,6 +14,8 @@ categories = ["cryptography"]
 [dependencies]
 sm3 = "0.4.2"
 
-
 [dev-dependencies]
 hex = "0.4.3"
+hmac-sha1 = "0.1.3"
+hmac-sha256 = "1.1.7"
+benchmark-simple = "0.1.8"
diff --git a/README.md b/README.md
index 29ed84b..65bab2e 100644
--- a/README.md
+++ b/README.md
@@ -19,3 +19,10 @@ let hmac2 = hm.finalize();
 assert_eq!("9d91da552268ddf11b9f69662773a66c6375b250336dfb9293e7e2611c36d79f", hex::encode(hmac2));
 ```
 
+Benchmark @MacBook Pro (Retina, 15-inch, Late 2013/2 GHz Quad-Core Intel Core i7)
+```text
+$ cargo run --release --example bench
+HMAC-SM3         : 219.19 M/s
+HMAC-SHA1        : 228.57 M/s
+HMAC-SHA256      : 204.96 M/s
+```
diff --git a/examples/bench.rs b/examples/bench.rs
new file mode 100644
index 0000000..3eb29e1
--- /dev/null
+++ b/examples/bench.rs
@@ -0,0 +1,46 @@
+use benchmark_simple::{Bench, Options};
+
+use hmac_sm3::hmac_sm3;
+
+fn test_hmac_sm3(m: &mut [u8]) {
+    let key = [0u8; 32];
+
+    hmac_sm3(&key, m);
+}
+
+fn test_hmac_sha1(m: &mut [u8]) {
+    let key = [0u8; 32];
+
+    hmacsha1::hmac_sha1(&key, m);
+}
+
+fn test_hmac_sha256(m: &mut [u8]) {
+    let key = [0u8; 32];
+
+    let mut hsha256 = hmac_sha256::HMAC::new(&key);
+    hsha256.update(m);
+    hsha256.finalize();
+}
+
+fn main() {
+    let bench = Bench::new();
+    let mut m = vec![0xd0u8; 16384];
+
+    let options = &Options {
+        iterations: 1_000,
+        warmup_iterations: 1_00,
+        min_samples: 5,
+        max_samples: 10,
+        max_rsd: 1.0,
+        ..Default::default()
+    };
+
+    let res = bench.run(options, || test_hmac_sm3(&mut m));
+    println!("HMAC-SM3         : {}", res.throughput(m.len() as _));
+
+    let res = bench.run(options, || test_hmac_sha1(&mut m));
+    println!("HMAC-SHA1        : {}", res.throughput(m.len() as _));
+
+    let res = bench.run(options, || test_hmac_sha256(&mut m));
+    println!("HMAC-SHA256      : {}", res.throughput(m.len() as _));
+}
\ No newline at end of file
diff --git a/src/lib.rs b/src/lib.rs
index 5c51b39..65bbda7 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -11,7 +11,7 @@ pub struct HmacSm3 {
 
 impl HmacSm3 {
     pub fn new(key: &[u8]) -> Self {
-        let mut structured_key = vec![0_u8; BLOCK_LENGTH];
+        let mut structured_key = [0_u8; BLOCK_LENGTH];
         if key.len() > BLOCK_LENGTH {
             structured_key[0..SM3_OUTPUT_LENGTH].copy_from_slice(sm3_digest(&key).as_slice());
         } else {
@@ -39,9 +39,7 @@ impl HmacSm3 {
 
     pub fn finalize(&mut self) -> Vec<u8> {
         let ipad_message_digest = self.sm3.clone().finalize();
-        let mut opad_ipad_message_digest = self.opad.to_vec();
-        opad_ipad_message_digest.extend_from_slice(ipad_message_digest.as_slice());
-        sm3_digest(&opad_ipad_message_digest).as_slice().to_vec()
+        sm3_digest_2(&self.opad, &ipad_message_digest).as_slice().to_vec()
     }
 }
 
@@ -51,12 +49,21 @@ pub fn hmac_sm3(key: &[u8], message: &[u8]) -> Vec<u8> {
     hsm3.finalize()
 }
 
+#[inline]
 fn sm3_digest(message: &[u8]) -> Output<Sm3> {
     let mut sm3 = Sm3::new();
     sm3.update(&message);
     sm3.finalize()
 }
 
+#[inline]
+fn sm3_digest_2(message: &[u8], message2: &[u8]) -> Output<Sm3> {
+    let mut sm3 = Sm3::new();
+    sm3.update(&message);
+    sm3.update(&message2);
+    sm3.finalize()
+}
+
 #[test]
 fn test_001() {
     let message = b"Hello World";