Merging upstream version 1.67.1+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 128 insertions, 0 deletions

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 <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 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<Option<RngSource>> = RefCell::new(None);
+);
+
+pub fn getrandom_inner(dest: &mut [u8]) -> Result<(), Error> {
+    assert_eq!(mem::size_of::<usize>(), 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<RngSource, Error> {
+    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<Self_, JsValue>;
+
+    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;
+}