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change impl Drop for SharedSecret to use clear directly

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This commit is contained in:
DebugSteven 2018-11-16 12:48:49 -05:00
parent cb18af7c1b
commit 4c6498ec69
1 changed files with 6 additions and 10 deletions
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10
src/x25519.rs
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@ -12,7 +12,6 @@
//! This implements x25519 key exchange as specified by Mike Hamburg
//! and Adam Langley in [RFC7748](https://tools.ietf.org/html/rfc7748).
use core::mem;
use core::ops::Mul;
use clear_on_drop::clear::Clear;
@ -83,18 +82,15 @@ impl Ephemeral {
}
#[repr(C)]
/// A DH SharedSecret
#[repr(C)]
#[derive(Default)] // we derive Default in order to use the clear() method in Drop
pub struct SharedSecret(pub (crate) MontgomeryPoint);
/// Overwrite shared secret material with null bytes when it goes out of scope.
impl Drop for SharedSecret {
fn drop(&mut self) {
let bytes: &mut [u8; 32] = unsafe {
mem::transmute::<&mut MontgomeryPoint, &mut [u8; 32]>
(&mut self.0)
};
bytes.clear();
self.0.clear();
}
}