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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..458e9e8
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,12 @@
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+edition = "2021"
+
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+[lib]
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+crate-type = ["cdylib"]
+
+[dependencies]
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diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..def9e49
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,13 @@
+[build-system]
+requires = ["maturin>=0.12,<0.13"]
+build-backend = "maturin"
+
+[project]
+name = "rust-hashlib-testing"
+requires-python = ">=3.7"
+classifiers = [
+    "Programming Language :: Rust",
+    "Programming Language :: Python :: Implementation :: CPython",
+    "Programming Language :: Python :: Implementation :: PyPy",
+]
+
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..da8ae28
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,15 @@
+
+use pyo3::prelude::*;
+
+/// Formats the sum of two numbers as string.
+#[pyfunction]
+fn sum_as_string(a: usize, b: usize) -> PyResult<String> {
+    Ok((a + b).to_string())
+}
+
+/// A Python module implemented in Rust.
+#[pymodule]
+fn rust_hashlib_testing(_py: Python, m: &PyModule) -> PyResult<()> {
+    m.add_function(wrap_pyfunction!(sum_as_string, m)?)?;
+    Ok(())
+}
\ No newline at end of file