libs/bssl/src/rand.rs

// Copyright 2023, The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

//! Wrappers of the randon number generations functions in BoringSSL rand.h.

use crate::util::check_int_result;
use bssl_avf_error::{ApiName, Result};
use bssl_sys::RAND_bytes;

/// Fills the given `dest` with random data.
pub fn rand_bytes(dest: &mut [u8]) -> Result<()> {
    // SAFETY: This function only writes to the given buffer within its bounds.
    let ret = unsafe { RAND_bytes(dest.as_mut_ptr(), dest.len()) };
    check_int_result(ret, ApiName::RAND_bytes)
}