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seckey 0.4.0

Use `memsec` protected secret memory.
Documentation 
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#![cfg_attr(feature = "place", feature(placement_in_syntax))]

extern crate seckey;
#[cfg(unix)] extern crate nix;

use std::slice;


#[cfg(feature = "place")]
#[cfg(all(unix, not(any(target_os = "macos", target_os = "ios"))))]
#[should_panic]
#[test]
fn place_protect_seckey_test() {
    use seckey::SecHeap;
    use nix::sys::signal;
    extern fn sigsegv(_: i32) { panic!() }
    let sigaction = signal::SigAction::new(
        signal::SigHandler::Handler(sigsegv),
        signal::SA_SIGINFO,
        signal::SigSet::empty(),
    );
    unsafe { signal::sigaction(signal::SIGSEGV, &sigaction).ok() };

    let mut secpass = SecHeap <- [1; 8];

    let mut wpass = secpass.write();
    let bs_bytes = unsafe {
        // unsafe get secpass ptr
        slice::from_raw_parts_mut(wpass.as_mut_ptr(), wpass.len())
    };
    drop(wpass);
    bs_bytes[0] = 0; // SIGSEGV !
}

#[cfg(all(unix, not(any(target_os = "macos", target_os = "ios"))))]
#[should_panic]
#[test]
fn protect_seckey_test() {
    use seckey::SecKey;
    use nix::sys::signal;
    extern fn sigsegv(_: i32) { panic!() }
    let sigaction = signal::SigAction::new(
        signal::SigHandler::Handler(sigsegv),
        signal::SA_SIGINFO,
        signal::SigSet::empty(),
    );
    unsafe { signal::sigaction(signal::SIGSEGV, &sigaction).ok() };

    let mut secpass = SecKey::new([1; 8]).unwrap();

    let mut wpass = secpass.write();
    let bs_bytes = unsafe {
        // unsafe get secpass ptr
        slice::from_raw_parts_mut(wpass.as_mut_ptr(), wpass.len())
    };
    drop(wpass);
    bs_bytes[0] = 0; // SIGSEGV !
}

#[cfg(feature = "place")]
#[test]
fn place_seckey_read_then_read() {
    use seckey::SecHeap;

    let secpass = SecHeap <- 1;

    let rpass1 = secpass.read();
    let rpass2 = secpass.read();

    assert_eq!(1, *rpass1);
    assert_eq!(1, *rpass2);

    drop(rpass1);

    assert_eq!(1, *rpass2);
}

#[test]
fn seckey_read_then_read() {
    use seckey::SecKey;

    let secpass = SecKey::new(1).unwrap();

    let rpass1 = secpass.read();
    let rpass2 = secpass.read();

    assert_eq!(1, *rpass1);
    assert_eq!(1, *rpass2);

    drop(rpass1);

    assert_eq!(1, *rpass2);
}

#[cfg(feature = "place")]
#[test]
fn place_seckey_drop() {
    use seckey::SecHeap;

    static mut X: bool = false;

    struct Bar;
    impl Drop for Bar {
        fn drop(&mut self) {
            unsafe { X = true; }
        }
    }

    let bar = SecHeap <- Bar;
    drop(bar); // first `Drop`

    assert!(unsafe { X });
}

#[test]
fn seckey_drop() {
    use seckey::SecKey;

    static mut X: usize = 0;

    struct Bar(usize);
    struct Baz<T>(T);
    impl Drop for Bar {
        fn drop(&mut self) {
            unsafe {
                X += 1;
                assert_eq!(
                    self.0,
                    if X == 2 { 0 } else { X }
                );
            }
        }
    }

    let bar = Bar(1);
    let bar2 = SecKey::new(bar).unwrap();
    drop(bar2); // first `Drop`

    assert_eq!(unsafe { X }, 1);

    let mut bar = Bar(3);
    let bar3 = unsafe { SecKey::from_raw(&mut bar).unwrap() };
    drop(bar);  // second `Drop`, memzero
    drop(bar3); // third `Drop`

    assert_eq!(unsafe { X }, 3);

    let baz = Baz(Bar(4));
    let baz2 = SecKey::new(baz).unwrap();
    drop(baz2); // fourth `Drop`

    assert_eq!(unsafe { X }, 4);
}