diff --git a/examples/sha.rs b/examples/sha.rs
index 15f9007..1ef9764 100644
--- a/examples/sha.rs
+++ b/examples/sha.rs
@@ -1,19 +1,41 @@
-use crypto_utils::sha::{Algorithm, CryptographicHash};
+use crypto_utils::sha::{Algorithm, CryptographicHash, CryptographicMac, AlgorithmMac};
 
 fn main() {
     let input = "This is a input text to be hashed";
 
-    println!("input  = `{input}`");
+    println!("==> Sha");
+
+    println!("input       = `{input}`");
 
     let sha1 = CryptographicHash::hash(Algorithm::SHA1, input.as_bytes());
 
-    println!("sha1   = `{}`", hex::encode(sha1));
+    println!("sha1        = `{}`", hex::encode(sha1));
 
     let sha256 = CryptographicHash::hash(Algorithm::SHA256, input.as_bytes());
 
-    println!("sha256 = `{}`", hex::encode(sha256));
+    println!("sha256      = `{}`", hex::encode(sha256));
 
     let sha512 = CryptographicHash::hash(Algorithm::SHA512, input.as_bytes());
 
-    println!("sha512 = `{}`", hex::encode(sha512));
+    println!("sha512      = `{}`", hex::encode(sha512));
+
+    println!("==> HMAC-Sha");
+
+    let secret = "secret";
+    let input = "This is a input text to be hashed";
+
+    println!("input       = `{input}`");
+    println!("secret      = `{secret}`");
+
+    let sha1 = CryptographicMac::hash(AlgorithmMac::HmacSHA1, secret.as_bytes(), input.as_bytes()).unwrap();
+
+    println!("hmac sha1   = `{}`", hex::encode(sha1));
+
+    let sha256 = CryptographicMac::hash(AlgorithmMac::HmacSHA256, secret.as_bytes(), input.as_bytes()).unwrap();
+
+    println!("hmac sha256 = `{}`", hex::encode(sha256));
+
+    let sha512 =CryptographicMac::hash(AlgorithmMac::HmacSHA512, secret.as_bytes(), input.as_bytes()).unwrap();
+
+    println!("hmac sha512 = `{}`", hex::encode(sha512));
 }