From 4547b622d8d29df964fa2914213088b148c498fc Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Wed, 17 Apr 2024 14:18:32 +0200 Subject: Merging upstream version 1.67.1+dfsg1. Signed-off-by: Daniel Baumann --- vendor/getrandom-0.1.16/src/wasm32_bindgen.rs | 128 ++++++++++++++++++++++++++ 1 file changed, 128 insertions(+) create mode 100644 vendor/getrandom-0.1.16/src/wasm32_bindgen.rs (limited to 'vendor/getrandom-0.1.16/src/wasm32_bindgen.rs') diff --git a/vendor/getrandom-0.1.16/src/wasm32_bindgen.rs b/vendor/getrandom-0.1.16/src/wasm32_bindgen.rs new file mode 100644 index 000000000..77088ffa4 --- /dev/null +++ b/vendor/getrandom-0.1.16/src/wasm32_bindgen.rs @@ -0,0 +1,128 @@ +// Copyright 2018 Developers of the Rand project. +// +// Licensed under the Apache License, Version 2.0 or the MIT license +// , at your +// option. This file may not be copied, modified, or distributed +// except according to those terms. + +//! Implementation for WASM via wasm-bindgen +extern crate std; + +use core::cell::RefCell; +use core::mem; +use std::thread_local; + +use js_sys::Uint8Array; +// We have to rename wasm_bindgen to bindgen in the Cargo.toml for backwards +// compatibility. We have to rename it back here or else the macros will break. +extern crate bindgen as wasm_bindgen; +use wasm_bindgen::prelude::*; + +use crate::error::{BINDGEN_CRYPTO_UNDEF, BINDGEN_GRV_UNDEF}; +use crate::Error; + +const CHUNK_SIZE: usize = 256; + +#[derive(Clone, Debug)] +enum RngSource { + Node(NodeCrypto), + Browser(BrowserCrypto, Uint8Array), +} + +// JsValues are always per-thread, so we initialize RngSource for each thread. +// See: https://github.com/rustwasm/wasm-bindgen/pull/955 +thread_local!( + static RNG_SOURCE: RefCell> = RefCell::new(None); +); + +pub fn getrandom_inner(dest: &mut [u8]) -> Result<(), Error> { + assert_eq!(mem::size_of::(), 4); + + RNG_SOURCE.with(|f| { + let mut source = f.borrow_mut(); + if source.is_none() { + *source = Some(getrandom_init()?); + } + + match source.as_ref().unwrap() { + RngSource::Node(n) => n.random_fill_sync(dest), + RngSource::Browser(crypto, buf) => { + // getRandomValues does not work with all types of WASM memory, + // so we initially write to browser memory to avoid exceptions. + for chunk in dest.chunks_mut(CHUNK_SIZE) { + // The chunk can be smaller than buf's length, so we call to + // JS to create a smaller view of buf without allocation. + let sub_buf = buf.subarray(0, chunk.len() as u32); + + crypto.get_random_values(&sub_buf); + sub_buf.copy_to(chunk); + } + } + }; + Ok(()) + }) +} + +fn getrandom_init() -> Result { + if let Ok(self_) = Global::get_self() { + // If `self` is defined then we're in a browser somehow (main window + // or web worker). We get `self.crypto` (called `msCrypto` on IE), so we + // can call `crypto.getRandomValues`. If `crypto` isn't defined, we + // assume we're in an older web browser and the OS RNG isn't available. + + let crypto: BrowserCrypto = match (self_.crypto(), self_.ms_crypto()) { + (crypto, _) if !crypto.is_undefined() => crypto.into(), + (_, crypto) if !crypto.is_undefined() => crypto.into(), + _ => return Err(BINDGEN_CRYPTO_UNDEF), + }; + + // Test if `crypto.getRandomValues` is undefined as well + if crypto.get_random_values_fn().is_undefined() { + return Err(BINDGEN_GRV_UNDEF); + } + + let buf = Uint8Array::new_with_length(CHUNK_SIZE as u32); + return Ok(RngSource::Browser(crypto, buf)); + } + + return Ok(RngSource::Node(MODULE.require("crypto"))); +} + +#[wasm_bindgen] +extern "C" { + type Global; + #[wasm_bindgen(getter, catch, static_method_of = Global, js_class = self, js_name = self)] + fn get_self() -> Result; + + type Self_; + #[wasm_bindgen(method, getter, js_name = "msCrypto", structural)] + fn ms_crypto(me: &Self_) -> JsValue; + #[wasm_bindgen(method, getter, structural)] + fn crypto(me: &Self_) -> JsValue; + + #[derive(Clone, Debug)] + type BrowserCrypto; + + // TODO: these `structural` annotations here ideally wouldn't be here to + // avoid a JS shim, but for now with feature detection they're + // unavoidable. + #[wasm_bindgen(method, js_name = getRandomValues, structural, getter)] + fn get_random_values_fn(me: &BrowserCrypto) -> JsValue; + #[wasm_bindgen(method, js_name = getRandomValues, structural)] + fn get_random_values(me: &BrowserCrypto, buf: &Uint8Array); + + #[derive(Clone, Debug)] + type NodeCrypto; + + #[wasm_bindgen(method, js_name = randomFillSync, structural)] + fn random_fill_sync(me: &NodeCrypto, buf: &mut [u8]); + + type NodeModule; + + #[wasm_bindgen(js_name = module)] + static MODULE: NodeModule; + + #[wasm_bindgen(method)] + fn require(this: &NodeModule, s: &str) -> NodeCrypto; +} -- cgit v1.2.3