55 lines
1.4 KiB
Rust
55 lines
1.4 KiB
Rust
// Copyright 2015-2018 Parity Technologies (UK) Ltd.
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// This file is part of Parity.
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// Parity is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// Parity is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with Parity. If not, see <http://www.gnu.org/licenses/>.
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use std::ops::{Deref, DerefMut};
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use std::ptr;
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/// Wrapper to zero out memory when dropped.
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#[derive(Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
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pub struct Memzero<T: AsMut<[u8]>> {
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mem: T,
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}
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impl<T: AsMut<[u8]>> From<T> for Memzero<T> {
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fn from(mem: T) -> Memzero<T> {
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Memzero { mem }
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}
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}
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impl<T: AsMut<[u8]>> Drop for Memzero<T> {
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fn drop(&mut self) {
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unsafe {
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for byte_ref in self.mem.as_mut() {
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ptr::write_volatile(byte_ref, 0)
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}
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}
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}
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}
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impl<T: AsMut<[u8]>> Deref for Memzero<T> {
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type Target = T;
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fn deref(&self) -> &Self::Target {
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&self.mem
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}
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}
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impl<T: AsMut<[u8]>> DerefMut for Memzero<T> {
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fn deref_mut(&mut self) -> &mut Self::Target {
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&mut self.mem
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}
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}
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