nuts-container 0.7.9

// MIT License
//
// Copyright (c) 2022-2024 Robin Doer
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
// IN THE SOFTWARE.

use std::fmt;
use std::ops::{Deref, DerefMut};

#[derive(Clone, PartialEq)]
pub struct SecureVec(Vec<u8>);

impl AsRef<[u8]> for SecureVec {
    fn as_ref(&self) -> &[u8] {
        &self.0
    }
}

impl Deref for SecureVec {
    type Target = Vec<u8>;

    fn deref(&self) -> &Vec<u8> {
        &self.0
    }
}

impl DerefMut for SecureVec {
    fn deref_mut(&mut self) -> &mut Self::Target {
        &mut self.0
    }
}

impl From<Vec<u8>> for SecureVec {
    fn from(inner: Vec<u8>) -> Self {
        SecureVec(inner)
    }
}

impl Drop for SecureVec {
    fn drop(&mut self) {
        self.0.resize(self.0.capacity(), 0);

        for elem in self.0.iter_mut() {
            *elem = 0;
        }
    }
}

impl fmt::Debug for SecureVec {
    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
        let mut dbg = fmt.debug_tuple("SecureVec");

        if cfg!(feature = "debug-plain-keys") {
            dbg.field(&format!("<{} bytes>", self.0.len())).finish()
        } else {
            dbg.field(&self.0).finish()
        }
    }
}