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/* -*- 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 "js/ScalarType.h"
#include "js/experimental/TypedData.h" // JS_GetArrayBufferViewType
#include "nsCOMPtr.h"
#include "nsIRandomGenerator.h"
#include "nsReadableUtils.h"
#include "mozilla/dom/CryptoBinding.h"
#include "mozilla/dom/SubtleCrypto.h"
#include "nsServiceManagerUtils.h"
namespace mozilla::dom {
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(Crypto)
NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
NS_INTERFACE_MAP_ENTRY(nsISupports)
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(nsIGlobalObject* aParent) : mParent(aParent) {}
Crypto::~Crypto() = default;
/* virtual */
JSObject* Crypto::WrapObject(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto) {
return Crypto_Binding::Wrap(aCx, this, aGivenProto);
}
void Crypto::GetRandomValues(JSContext* aCx, const ArrayBufferView& aArray,
JS::MutableHandle<JSObject*> aRetval,
ErrorResult& aRv) {
// Throw if the wrong type of ArrayBufferView is passed in
// (Part of the Web Crypto API spec)
switch (aArray.Type()) {
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:
case js::Scalar::BigInt64:
case js::Scalar::BigUint64:
break;
default:
aRv.Throw(NS_ERROR_DOM_TYPE_MISMATCH_ERR);
return;
}
nsCOMPtr<nsIRandomGenerator> randomGenerator =
do_GetService("@mozilla.org/security/random-generator;1");
if (!randomGenerator) {
aRv.Throw(NS_ERROR_DOM_OPERATION_ERR);
return;
}
aArray.ProcessFixedData([&](const Span<uint8_t>& aData) {
if (aData.Length() == 0) {
NS_WARNING("ArrayBufferView length is 0, cannot continue");
aRetval.set(aArray.Obj());
return;
}
if (aData.Length() > 65536) {
aRv.ThrowQuotaExceededError(
"getRandomValues can only generate maximum 65536 bytes");
return;
}
nsresult rv = randomGenerator->GenerateRandomBytesInto(aData.Elements(),
aData.Length());
if (NS_FAILED(rv)) {
aRv.Throw(NS_ERROR_DOM_OPERATION_ERR);
return;
}
aRetval.set(aArray.Obj());
});
}
void Crypto::RandomUUID(nsACString& aRetVal) {
// NSID_LENGTH == 39 == 36 UUID chars + 2 curly braces + 1 NUL byte
static_assert(NSID_LENGTH == 39);
nsIDToCString uuidString(nsID::GenerateUUID());
MOZ_ASSERT(strlen(uuidString.get()) == NSID_LENGTH - 1);
// Omit the curly braces and NUL.
aRetVal = Substring(uuidString.get() + 1, NSID_LENGTH - 3);
MOZ_ASSERT(aRetVal.Length() == NSID_LENGTH - 3);
}
SubtleCrypto* Crypto::Subtle() {
if (!mSubtle) {
mSubtle = new SubtleCrypto(GetParentObject());
}
return mSubtle;
}
} // namespace mozilla::dom
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