/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

use crate::error::*;
use crate::util::assert_nss_initialized;
use std::os::raw::c_void;

pub fn secure_memcmp(a: &[u8], b: &[u8]) -> Result<bool> {
    assert_nss_initialized();
    // NSS_SecureMemcmp will compare N elements fron our slices,
    // so make sure they are the same length first.
    if a.len() != b.len() {
        return Ok(false);
    }
    let result = unsafe {
        nss_sys::NSS_SecureMemcmp(
            a.as_ptr() as *const c_void,
            b.as_ptr() as *const c_void,
            a.len(),
        )
    };
    Ok(result == 0)
}