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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
commit | 698f8c2f01ea549d77d7dc3338a12e04c11057b9 (patch) | |
tree | 173a775858bd501c378080a10dca74132f05bc50 /vendor/getrandom-0.1.14/src/wasm32_stdweb.rs | |
parent | Initial commit. (diff) | |
download | rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.tar.xz rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.zip |
Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'vendor/getrandom-0.1.14/src/wasm32_stdweb.rs')
-rw-r--r-- | vendor/getrandom-0.1.14/src/wasm32_stdweb.rs | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/vendor/getrandom-0.1.14/src/wasm32_stdweb.rs b/vendor/getrandom-0.1.14/src/wasm32_stdweb.rs new file mode 100644 index 000000000..6e5e78a4a --- /dev/null +++ b/vendor/getrandom-0.1.14/src/wasm32_stdweb.rs @@ -0,0 +1,114 @@ +// 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(()) +} |