64 lines
2 KiB
Rust
64 lines
2 KiB
Rust
// Copyright (C) 2018-2019, Cloudflare, Inc.
|
|
// All rights reserved.
|
|
//
|
|
// Redistribution and use in source and binary forms, with or without
|
|
// modification, are permitted provided that the following conditions are
|
|
// met:
|
|
//
|
|
// * Redistributions of source code must retain the above copyright notice,
|
|
// this list of conditions and the following disclaimer.
|
|
//
|
|
// * Redistributions in binary form must reproduce the above copyright
|
|
// notice, this list of conditions and the following disclaimer in the
|
|
// documentation and/or other materials provided with the distribution.
|
|
//
|
|
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
|
|
// IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
|
|
// THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
|
// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
|
|
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
|
|
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
|
|
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
|
|
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
|
|
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
|
|
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
|
|
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
pub fn rand_bytes(buf: &mut [u8]) {
|
|
unsafe {
|
|
RAND_bytes(buf.as_mut_ptr(), buf.len());
|
|
}
|
|
}
|
|
|
|
pub fn rand_u8() -> u8 {
|
|
let mut buf = [0; 1];
|
|
|
|
rand_bytes(&mut buf);
|
|
|
|
buf[0]
|
|
}
|
|
|
|
pub fn rand_u64() -> u64 {
|
|
let mut buf = [0; 8];
|
|
|
|
rand_bytes(&mut buf);
|
|
|
|
u64::from_ne_bytes(buf)
|
|
}
|
|
|
|
pub fn rand_u64_uniform(max: u64) -> u64 {
|
|
let chunk_size = u64::max_value() / max;
|
|
let end_of_last_chunk = chunk_size * max;
|
|
|
|
let mut r = rand_u64();
|
|
|
|
while r >= end_of_last_chunk {
|
|
r = rand_u64();
|
|
}
|
|
|
|
r / chunk_size
|
|
}
|
|
|
|
extern {
|
|
fn RAND_bytes(buf: *mut u8, len: libc::size_t) -> libc::c_int;
|
|
}
|