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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use dom::bindings::cell::DOMRefCell;
use dom::bindings::codegen::Bindings::CryptoBinding;
use dom::bindings::codegen::Bindings::CryptoBinding::CryptoMethods;
use dom::bindings::error::{Error, Fallible};
use dom::bindings::global::GlobalRef;
use dom::bindings::js::Root;
use dom::bindings::reflector::{Reflector, reflect_dom_object};
use js::jsapi::{JSContext, JSObject};
use js::jsapi::{JS_GetArrayBufferViewType, JS_GetObjectAsArrayBufferView, Type};
use rand::{OsRng, Rng};
use std::{ptr, slice};
no_jsmanaged_fields!(OsRng);
// https://developer.mozilla.org/en-US/docs/Web/API/Crypto
#[dom_struct]
pub struct Crypto {
reflector_: Reflector,
rng: DOMRefCell<OsRng>,
}
impl Crypto {
fn new_inherited() -> Crypto {
Crypto {
reflector_: Reflector::new(),
rng: DOMRefCell::new(OsRng::new().unwrap()),
}
}
pub fn new(global: GlobalRef) -> Root<Crypto> {
reflect_dom_object(box Crypto::new_inherited(), global, CryptoBinding::Wrap)
}
}
impl CryptoMethods for Crypto {
#[allow(unsafe_code)]
// https://dvcs.w3.org/hg/webcrypto-api/raw-file/tip/spec/Overview.html#Crypto-method-getRandomValues
fn GetRandomValues(&self,
_cx: *mut JSContext,
input: *mut JSObject)
-> Fallible<*mut JSObject> {
let mut length = 0;
let mut data = ptr::null_mut();
if unsafe { JS_GetObjectAsArrayBufferView(input, &mut length, &mut data).is_null() } {
return Err(Error::Type("Argument to Crypto.getRandomValues is not an ArrayBufferView"
.to_owned()));
}
if !is_integer_buffer(input) {
return Err(Error::TypeMismatch);
}
if length > 65536 {
return Err(Error::QuotaExceeded);
}
let mut buffer = unsafe {
slice::from_raw_parts_mut(data, length as usize)
};
self.rng.borrow_mut().fill_bytes(&mut buffer);
Ok(input)
}
}
#[allow(unsafe_code)]
fn is_integer_buffer(input: *mut JSObject) -> bool {
match unsafe { JS_GetArrayBufferViewType(input) } {
Type::Uint8 |
Type::Uint8Clamped |
Type::Int8 |
Type::Uint16 |
Type::Int16 |
Type::Uint32 |
Type::Int32 => true,
_ => false,
}
}
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