1 files changed, 111 insertions, 0 deletions
diff --git a/dom/base/Crypto.cpp b/dom/base/Crypto.cpp
new file mode 100644
index 0000000000..21eb1f730e
--- /dev/null
+++ b/dom/base/Crypto.cpp
@@ -0,0 +1,111 @@
+/* -*- 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