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-rw-r--r--dom/base/Crypto.cpp111
1 files changed, 111 insertions, 0 deletions
diff --git a/dom/base/Crypto.cpp b/dom/base/Crypto.cpp
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+++ b/dom/base/Crypto.cpp
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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