diff options
Diffstat (limited to 'getrandom/src/wasm32_stdweb.rs')
-rw-r--r-- | getrandom/src/wasm32_stdweb.rs | 114 |
1 files changed, 0 insertions, 114 deletions
diff --git a/getrandom/src/wasm32_stdweb.rs b/getrandom/src/wasm32_stdweb.rs deleted file mode 100644 index 6e5e78a..0000000 --- a/getrandom/src/wasm32_stdweb.rs +++ /dev/null @@ -1,114 +0,0 @@ -// Copyright 2018 Developers of the Rand project. -// -// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or -// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license -// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your -// option. This file may not be copied, modified, or distributed -// except according to those terms. - -//! Implementation for WASM via stdweb -extern crate std; - -use core::mem; - -use stdweb::js; -use stdweb::unstable::TryInto; -use stdweb::web::error::Error as WebError; - -use crate::error::{STDWEB_NO_RNG, STDWEB_RNG_FAILED}; -use crate::Error; -use std::sync::Once; - -#[derive(Clone, Copy, Debug)] -enum RngSource { - Browser, - Node, -} - -pub fn getrandom_inner(dest: &mut [u8]) -> Result<(), Error> { - assert_eq!(mem::size_of::<usize>(), 4); - static ONCE: Once = Once::new(); - static mut RNG_SOURCE: Result<RngSource, Error> = Ok(RngSource::Node); - - // SAFETY: RNG_SOURCE is only written once, before being read. - ONCE.call_once(|| unsafe { - RNG_SOURCE = getrandom_init(); - }); - getrandom_fill(unsafe { RNG_SOURCE }?, dest) -} - -fn getrandom_init() -> Result<RngSource, Error> { - let result = js! { - try { - if ( - typeof self === "object" && - typeof self.crypto === "object" && - typeof self.crypto.getRandomValues === "function" - ) { - return { success: true, ty: 1 }; - } - - if (typeof require("crypto").randomBytes === "function") { - return { success: true, ty: 2 }; - } - - return { success: false, error: new Error("not supported") }; - } catch(err) { - return { success: false, error: err }; - } - }; - - if js! { return @{ result.as_ref() }.success } == true { - let ty = js! { return @{ result }.ty }; - - if ty == 1 { - Ok(RngSource::Browser) - } else if ty == 2 { - Ok(RngSource::Node) - } else { - unreachable!() - } - } else { - let _err: WebError = js! { return @{ result }.error }.try_into().unwrap(); - error!("getrandom unavailable: {}", _err); - Err(STDWEB_NO_RNG) - } -} - -fn getrandom_fill(source: RngSource, dest: &mut [u8]) -> Result<(), Error> { - for chunk in dest.chunks_mut(65536) { - let len = chunk.len() as u32; - let ptr = chunk.as_mut_ptr() as i32; - - let result = match source { - RngSource::Browser => js! { - try { - let array = new Uint8Array(@{ len }); - self.crypto.getRandomValues(array); - HEAPU8.set(array, @{ ptr }); - - return { success: true }; - } catch(err) { - return { success: false, error: err }; - } - }, - RngSource::Node => js! { - try { - let bytes = require("crypto").randomBytes(@{ len }); - HEAPU8.set(new Uint8Array(bytes), @{ ptr }); - - return { success: true }; - } catch(err) { - return { success: false, error: err }; - } - }, - }; - - if js! { return @{ result.as_ref() }.success } != true { - let _err: WebError = js! { return @{ result }.error }.try_into().unwrap(); - error!("getrandom failed: {}", _err); - return Err(STDWEB_RNG_FAILED); - } - } - Ok(()) -} |