/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ /* vim: set ts=8 sts=2 et sw=2 tw=80: */ /* 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/. */ #include "Crypto.h" #include "jsfriendapi.h" #include "nsCOMPtr.h" #include "nsIRandomGenerator.h" #include "MainThreadUtils.h" #include "nsXULAppAPI.h" #include "mozilla/dom/ContentChild.h" #include "mozilla/dom/CryptoBinding.h" #include "nsServiceManagerUtils.h" using mozilla::dom::ContentChild; namespace mozilla { namespace dom { NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(Crypto) NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY NS_INTERFACE_MAP_ENTRY(nsISupports) NS_INTERFACE_MAP_ENTRY(nsIDOMCrypto) NS_INTERFACE_MAP_END NS_IMPL_CYCLE_COLLECTING_ADDREF(Crypto) NS_IMPL_CYCLE_COLLECTING_RELEASE(Crypto) NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(Crypto, mParent, mSubtle) Crypto::Crypto() { MOZ_COUNT_CTOR(Crypto); } Crypto::~Crypto() { MOZ_COUNT_DTOR(Crypto); } void Crypto::Init(nsIGlobalObject* aParent) { mParent = do_QueryInterface(aParent); MOZ_ASSERT(mParent); } /* virtual */ JSObject* Crypto::WrapObject(JSContext* aCx, JS::Handle aGivenProto) { return CryptoBinding::Wrap(aCx, this, aGivenProto); } void Crypto::GetRandomValues(JSContext* aCx, const ArrayBufferView& aArray, JS::MutableHandle aRetval, ErrorResult& aRv) { MOZ_ASSERT(NS_IsMainThread(), "Called on the wrong thread"); JS::Rooted view(aCx, aArray.Obj()); if (JS_IsTypedArrayObject(view) && JS_GetTypedArraySharedness(view)) { // Throw if the object is mapping shared memory (must opt in). aRv.ThrowTypeError(NS_LITERAL_STRING("Argument of Crypto.getRandomValues")); return; } // Throw if the wrong type of ArrayBufferView is passed in // (Part of the Web Crypto API spec) switch (JS_GetArrayBufferViewType(view)) { case js::Scalar::Int8: case js::Scalar::Uint8: case js::Scalar::Uint8Clamped: case js::Scalar::Int16: case js::Scalar::Uint16: case js::Scalar::Int32: case js::Scalar::Uint32: break; default: aRv.Throw(NS_ERROR_DOM_TYPE_MISMATCH_ERR); return; } aArray.ComputeLengthAndData(); uint32_t dataLen = aArray.Length(); if (dataLen == 0) { NS_WARNING("ArrayBufferView length is 0, cannot continue"); aRetval.set(view); return; } else if (dataLen > 65536) { aRv.Throw(NS_ERROR_DOM_QUOTA_EXCEEDED_ERR); return; } uint8_t* data = aArray.Data(); if (!XRE_IsParentProcess()) { InfallibleTArray randomValues; // Tell the parent process to generate random values via PContent ContentChild* cc = ContentChild::GetSingleton(); if (!cc->SendGetRandomValues(dataLen, &randomValues) || randomValues.Length() == 0) { aRv.Throw(NS_ERROR_FAILURE); return; } NS_ASSERTION(dataLen == randomValues.Length(), "Invalid length returned from parent process!"); memcpy(data, randomValues.Elements(), dataLen); } else { uint8_t *buf = GetRandomValues(dataLen); if (!buf) { aRv.Throw(NS_ERROR_FAILURE); return; } memcpy(data, buf, dataLen); free(buf); } aRetval.set(view); } SubtleCrypto* Crypto::Subtle() { if(!mSubtle) { mSubtle = new SubtleCrypto(GetParentObject()); } return mSubtle; } /* static */ uint8_t* Crypto::GetRandomValues(uint32_t aLength) { nsCOMPtr randomGenerator; nsresult rv; randomGenerator = do_GetService("@mozilla.org/security/random-generator;1"); NS_ENSURE_TRUE(randomGenerator, nullptr); uint8_t* buf; rv = randomGenerator->GenerateRandomBytes(aLength, &buf); NS_ENSURE_SUCCESS(rv, nullptr); return buf; } } // namespace dom } // namespace mozilla