diff --git a/Cargo.toml b/Cargo.toml
index 3ba7f96..dbd6d27 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -8,3 +8,5 @@ license = "MIT OR Apache-2.0"
 publish = false
 
 [dependencies]
+pbkdf2 = "0.12.2"
+sha2 = "0.10.8"
diff --git a/src/lib.rs b/src/lib.rs
index e69de29..91334d4 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -0,0 +1,21 @@
+use pbkdf2::pbkdf2_hmac;
+use sha2::Sha256;
+
+const DUMMY_SALT: &[u8] = b"some dummy salt";
+
+pub struct Task {
+	data: &'static [u8],
+	cost: u32,
+}
+
+impl Task {
+	pub fn new(data: &'static [u8], cost: u32) -> Self {
+		Self { data, cost }
+	}
+
+	pub fn execute(&self) {
+		let mut key1 = [0u8; 20];
+		pbkdf2_hmac::<Sha256>(self.data, DUMMY_SALT, self.cost, &mut key1);
+		println!("Task done: {key1:?}");
+	}
+}