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Crypto.cpp
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Crypto.cpp
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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/. */
#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)
{
return CryptoBinding::Wrap(aCx, this);
}
void
Crypto::GetRandomValues(JSContext* aCx, const ArrayBufferView& aArray,
JS::MutableHandle<JSObject*> aRetval,
ErrorResult& aRv)
{
NS_ABORT_IF_FALSE(NS_IsMainThread(), "Called on the wrong thread");
JS::Rooted<JSObject*> view(aCx, aArray.Obj());
// 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_GetProcessType() != GeckoProcessType_Default) {
InfallibleTArray<uint8_t> 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);
NS_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<nsIRandomGenerator> 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