| // Licensed to the Apache Software Foundation (ASF) under one |
| // or more contributor license agreements. See the NOTICE file |
| // distributed with this work for additional information |
| // regarding copyright ownership. The ASF licenses this file |
| // to you 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.. |
| |
| //! Interfaces to the operating system provided random number |
| //! generators. |
| |
| use std::{io, mem, fmt}; |
| use crate::Rng; |
| |
| /// A random number generator |
| pub struct SgxRng(imp::SgxRng); |
| |
| impl SgxRng { |
| /// Create a new `SgxRng`. |
| pub fn new() -> io::Result<SgxRng> { |
| imp::SgxRng::new().map(SgxRng) |
| } |
| } |
| |
| impl Rng for SgxRng { |
| fn next_u32(&mut self) -> u32 { self.0.next_u32() } |
| fn next_u64(&mut self) -> u64 { self.0.next_u64() } |
| fn fill_bytes(&mut self, v: &mut [u8]) { self.0.fill_bytes(v) } |
| } |
| |
| impl fmt::Debug for SgxRng { |
| fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { |
| write!(f, "SgxRng {{}}") |
| } |
| } |
| |
| fn next_u32(fill_buf: &mut dyn FnMut(&mut [u8])) -> u32 { |
| let mut buf: [u8; 4] = [0; 4]; |
| fill_buf(&mut buf); |
| unsafe { mem::transmute::<[u8; 4], u32>(buf) } |
| } |
| |
| fn next_u64(fill_buf: &mut dyn FnMut(&mut [u8])) -> u64 { |
| let mut buf: [u8; 8] = [0; 8]; |
| fill_buf(&mut buf); |
| unsafe { mem::transmute::<[u8; 8], u64>(buf) } |
| } |
| |
| mod imp { |
| |
| use sgx_types::*; |
| use sgx_trts::trts::rsgx_read_rand; |
| use std::io; |
| |
| use super::{next_u32, next_u64}; |
| use crate::Rng; |
| |
| fn getrandom(buf: &mut [u8]) -> SgxError { |
| rsgx_read_rand(buf) |
| } |
| |
| fn getrandom_fill_bytes(v: &mut [u8]) { |
| getrandom(v).expect("unexpected getrandom error"); |
| } |
| |
| #[allow(dead_code)] |
| fn is_getrandom_available() -> bool { true } |
| |
| pub struct SgxRng; |
| |
| impl SgxRng { |
| /// Create a new `SgxRng`. |
| pub fn new() -> io::Result<SgxRng> { |
| Ok(SgxRng) |
| } |
| } |
| |
| impl Rng for SgxRng { |
| fn next_u32(&mut self) -> u32 { |
| next_u32(&mut getrandom_fill_bytes) |
| } |
| fn next_u64(&mut self) -> u64 { |
| next_u64(&mut getrandom_fill_bytes) |
| } |
| fn fill_bytes(&mut self, v: &mut [u8]) { |
| getrandom_fill_bytes(v) |
| } |
| } |
| } |