mirror of
https://github.com/mozilla/gecko-dev.git
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147 lines
3.5 KiB
C++
147 lines
3.5 KiB
C++
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "Crypto.h"
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#include "jsfriendapi.h"
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#include "nsCOMPtr.h"
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#include "nsIRandomGenerator.h"
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#include "nsPIDOMWindow.h"
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#include "MainThreadUtils.h"
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#include "nsXULAppAPI.h"
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#include "mozilla/dom/ContentChild.h"
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#include "mozilla/dom/CryptoBinding.h"
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#include "nsServiceManagerUtils.h"
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using mozilla::dom::ContentChild;
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namespace mozilla {
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namespace dom {
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NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(Crypto)
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NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
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NS_INTERFACE_MAP_ENTRY(nsISupports)
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NS_INTERFACE_MAP_ENTRY(nsIDOMCrypto)
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NS_INTERFACE_MAP_END
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NS_IMPL_CYCLE_COLLECTING_ADDREF(Crypto)
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NS_IMPL_CYCLE_COLLECTING_RELEASE(Crypto)
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NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(Crypto, mWindow, mSubtle)
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Crypto::Crypto()
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{
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MOZ_COUNT_CTOR(Crypto);
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}
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Crypto::~Crypto()
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{
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MOZ_COUNT_DTOR(Crypto);
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}
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void
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Crypto::Init(nsIDOMWindow* aWindow)
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{
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mWindow = do_QueryInterface(aWindow);
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MOZ_ASSERT(mWindow);
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}
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/* virtual */ JSObject*
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Crypto::WrapObject(JSContext* aCx)
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{
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return CryptoBinding::Wrap(aCx, this);
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}
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void
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Crypto::GetRandomValues(JSContext* aCx, const ArrayBufferView& aArray,
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JS::MutableHandle<JSObject*> aRetval,
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ErrorResult& aRv)
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{
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NS_ABORT_IF_FALSE(NS_IsMainThread(), "Called on the wrong thread");
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JS::Rooted<JSObject*> view(aCx, aArray.Obj());
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// Throw if the wrong type of ArrayBufferView is passed in
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// (Part of the Web Crypto API spec)
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switch (JS_GetArrayBufferViewType(view)) {
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case js::Scalar::Int8:
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case js::Scalar::Uint8:
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case js::Scalar::Uint8Clamped:
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case js::Scalar::Int16:
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case js::Scalar::Uint16:
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case js::Scalar::Int32:
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case js::Scalar::Uint32:
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break;
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default:
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aRv.Throw(NS_ERROR_DOM_TYPE_MISMATCH_ERR);
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return;
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}
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aArray.ComputeLengthAndData();
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uint32_t dataLen = aArray.Length();
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if (dataLen == 0) {
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NS_WARNING("ArrayBufferView length is 0, cannot continue");
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aRetval.set(view);
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return;
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} else if (dataLen > 65536) {
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aRv.Throw(NS_ERROR_DOM_QUOTA_EXCEEDED_ERR);
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return;
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}
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uint8_t* data = aArray.Data();
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if (XRE_GetProcessType() != GeckoProcessType_Default) {
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InfallibleTArray<uint8_t> randomValues;
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// Tell the parent process to generate random values via PContent
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ContentChild* cc = ContentChild::GetSingleton();
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if (!cc->SendGetRandomValues(dataLen, &randomValues) ||
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randomValues.Length() == 0) {
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aRv.Throw(NS_ERROR_FAILURE);
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return;
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}
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NS_ASSERTION(dataLen == randomValues.Length(),
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"Invalid length returned from parent process!");
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memcpy(data, randomValues.Elements(), dataLen);
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} else {
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uint8_t *buf = GetRandomValues(dataLen);
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if (!buf) {
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aRv.Throw(NS_ERROR_FAILURE);
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return;
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}
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memcpy(data, buf, dataLen);
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NS_Free(buf);
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}
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aRetval.set(view);
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}
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SubtleCrypto*
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Crypto::Subtle()
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{
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if(!mSubtle) {
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mSubtle = new SubtleCrypto(GetParentObject());
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}
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return mSubtle;
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}
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/* static */ uint8_t*
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Crypto::GetRandomValues(uint32_t aLength)
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{
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nsCOMPtr<nsIRandomGenerator> randomGenerator;
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nsresult rv;
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randomGenerator = do_GetService("@mozilla.org/security/random-generator;1");
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NS_ENSURE_TRUE(randomGenerator, nullptr);
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uint8_t* buf;
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rv = randomGenerator->GenerateRandomBytes(aLength, &buf);
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NS_ENSURE_SUCCESS(rv, nullptr);
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return buf;
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}
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} // namespace dom
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} // namespace mozilla
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