mirror of
https://github.com/mozilla/gecko-dev.git
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111 lines
3.3 KiB
C++
111 lines
3.3 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* 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 "js/ScalarType.h"
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#include "js/experimental/TypedData.h" // JS_GetArrayBufferViewType
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#include "nsCOMPtr.h"
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#include "nsIRandomGenerator.h"
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#include "nsReadableUtils.h"
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#include "mozilla/dom/CryptoBinding.h"
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#include "mozilla/dom/SubtleCrypto.h"
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#include "nsServiceManagerUtils.h"
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namespace mozilla::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_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, mParent, mSubtle)
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Crypto::Crypto(nsIGlobalObject* aParent) : mParent(aParent) {}
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Crypto::~Crypto() = default;
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/* virtual */
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JSObject* Crypto::WrapObject(JSContext* aCx,
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JS::Handle<JSObject*> aGivenProto) {
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return Crypto_Binding::Wrap(aCx, this, aGivenProto);
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}
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void 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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// 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 (aArray.Type()) {
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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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case js::Scalar::BigInt64:
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case js::Scalar::BigUint64:
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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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nsCOMPtr<nsIRandomGenerator> randomGenerator =
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do_GetService("@mozilla.org/security/random-generator;1");
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if (!randomGenerator) {
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aRv.Throw(NS_ERROR_DOM_OPERATION_ERR);
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return;
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}
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aArray.ProcessFixedData([&](const Span<uint8_t>& aData) {
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if (aData.Length() == 0) {
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NS_WARNING("ArrayBufferView length is 0, cannot continue");
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aRetval.set(aArray.Obj());
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return;
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}
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if (aData.Length() > 65536) {
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aRv.ThrowQuotaExceededError(
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"getRandomValues can only generate maximum 65536 bytes");
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return;
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}
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nsresult rv = randomGenerator->GenerateRandomBytesInto(aData.Elements(),
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aData.Length());
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if (NS_FAILED(rv)) {
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aRv.Throw(NS_ERROR_DOM_OPERATION_ERR);
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return;
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}
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aRetval.set(aArray.Obj());
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});
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}
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void Crypto::RandomUUID(nsACString& aRetVal) {
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// NSID_LENGTH == 39 == 36 UUID chars + 2 curly braces + 1 NUL byte
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static_assert(NSID_LENGTH == 39);
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nsIDToCString uuidString(nsID::GenerateUUID());
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MOZ_ASSERT(strlen(uuidString.get()) == NSID_LENGTH - 1);
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// Omit the curly braces and NUL.
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aRetVal = Substring(uuidString.get() + 1, NSID_LENGTH - 3);
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MOZ_ASSERT(aRetVal.Length() == NSID_LENGTH - 3);
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}
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SubtleCrypto* Crypto::Subtle() {
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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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} // namespace mozilla::dom
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