curve25519_dalek_scalar.rs

use curve25519_dalek::Scalar;

let (mut a, ptr) = {
    let b = Scalar::from_bytes_mod_order([
        45, 34, 23, 78, 7, 12, 65, 4, 34, 12, 12, 45, 65, 45, 4, 54, 33, 26, 65, 44, 65, 44,
        67, 86, 43, 66, 8, 56, 42, 67, 78, 94,
    ]);
    println!("Creation Address: {:?}", b.bytes.as_ptr());

    (b, b.bytes.as_ptr())
};

println!("Value before dropping: {:?}", a.bytes);

let addr_a = a.bytes.as_ptr();

println!("Returned Address: {:?}", addr_a);

a.zeroize();

let val_at_returned_memory = unsafe { core::slice::from_raw_parts(addr_a, 32) };

println!("Value at Returned Address: {:?}", val_at_returned_memory); // Zeroed

let val_at_original_memory = unsafe { core::slice::from_raw_parts(ptr, 32) };
println!("Value at Creation Address: {:?}", val_at_original_memory); // value still in original memory