docs

main.py

@@ -1,21 +1,43 @@
 import zeroize
 import numpy as np
+import ctypes
 
 
+# Lock memory using ctypes
+def lock_memory():
+    libc = ctypes.CDLL("libc.so.6")
+    # Lock all current and future pages from being swapped out
+    libc.mlockall(ctypes.c_int(0x02 | 0x04))  # MCL_CURRENT | MCL_FUTURE
+
+
+def unlock_memory():
+    libc = ctypes.CDLL("libc.so.6")
+    # Unlock all locked pages
+    libc.munlockall()
+
+
+print("locking memory")
+lock_memory()
+
+print("allocate memory")
+
 # regular array
-arr = bytearray(b'1234567890')
+arr = bytearray(b"1234567890")
 
 # numpy array
 arr_np = np.array([0] * 10, dtype=np.uint8)
 arr_np[:] = arr
-assert arr_np.tobytes() == b'1234567890'
+assert arr_np.tobytes() == b"1234567890"
 
 print("zeroize'ing...: ")
 zeroize.zeroize1(arr)
 zeroize.zeroize_np(arr_np)
 
-print("checking if is zeroized...")
-assert arr == bytearray(b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')
+print("checking if is zeroized")
+assert arr == bytearray(b"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00")
 assert all(arr_np == 0)
 
+print("unlocking memory")
+unlock_memory()
+
 print("all good, bye!")

src/lib.rs

@@ -1,13 +1,15 @@
 use numpy::{PyArray1, PyArrayMethods};
+use pyo3::buffer::PyBuffer;
 use pyo3::prelude::*;
-use pyo3::types::PyByteArray;
+use pyo3::types::{PyByteArray, PyMemoryView};
 use zeroize_rs::Zeroize;
 
 /// A Python module implemented in Rust.
 #[pymodule]
 fn zeroize(_py: Python, m: &PyModule) -> PyResult<()> {
     m.add_function(wrap_pyfunction!(zeroize1, m)?)?;
     m.add_function(wrap_pyfunction!(zeroize_np, m)?)?;
+    // m.add_function(wrap_pyfunction!(zeroize_mv, m)?)?;
     Ok(())
 }
 
@@ -23,3 +25,19 @@ fn zeroize_np<'py>(arr: &Bound<'py, PyArray1<u8>>) -> PyResult<()> {
     unsafe { arr.as_slice_mut().unwrap().zeroize(); }
     Ok(())
 }
+
+// #[pyfunction]
+// fn zeroize_mv<'py>(arr: &PyMemoryView, len: usize) -> PyResult<()> {
+//     // Get the buffer information
+//     let buffer = PyBuffer::<u8>::get(arr)?;
+//
+//     // Get the raw mutable pointer and length of the memory view
+//     let ptr = arr.as_ptr() as *mut u8;
+//
+//     // Create a mutable slice from the raw pointer and length
+//     let arr: &mut [u8] = unsafe { std::slice::from_raw_parts_mut(ptr, len) };
+//
+//     arr.zeroize();
+//
+//     Ok(())
+// }