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// Copyright (C) 2022 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.
use anyhow::{ensure, Result};
use bssl_ffi as bssl_sys;
pub const ENTROPY_LEN: usize = bssl_sys::CTR_DRBG_ENTROPY_LEN as usize;
pub type Entropy = [u8; ENTROPY_LEN];
pub struct Drbg(*mut bssl_sys::CTR_DRBG_STATE);
impl Drbg {
pub fn new(entropy: &Entropy) -> Result<Drbg> {
let p = unsafe { bssl_sys::CTR_DRBG_new(entropy.as_ptr(), std::ptr::null(), 0) };
ensure!(!p.is_null(), "CTR_DRBG_new failed");
Ok(Drbg(p))
}
pub fn reseed(&mut self, entropy: &Entropy) -> Result<()> {
ensure!(
unsafe { bssl_sys::CTR_DRBG_reseed(self.0, entropy.as_ptr(), std::ptr::null(), 0) }
== 1,
"CTR_DRBG_reseed failed"
);
Ok(())
}
pub fn generate(&mut self, buf: &mut [u8]) -> Result<()> {
ensure!(
unsafe {
bssl_sys::CTR_DRBG_generate(
self.0,
buf.as_mut_ptr(),
buf.len(),
std::ptr::null(),
0,
)
} == 1,
"CTR_DRBG_generate failed"
);
Ok(())
}
}
impl Drop for Drbg {
fn drop(&mut self) {
unsafe {
bssl_sys::CTR_DRBG_free(self.0);
}
}
}
unsafe impl Send for Drbg {}
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