1 files changed, 114 insertions, 0 deletions
diff --git a/dom/base/Crypto.cpp b/dom/base/Crypto.cpp
new file mode 100644
index 0000000000..0422b2f215
--- /dev/null
+++ b/dom/base/Crypto.cpp
@@ -0,0 +1,114 @@
+/* -*- 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) {
+  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:
+    case js::Scalar::BigInt64:
+    case js::Scalar::BigUint64:
+      break;
+    default:
+      aRv.Throw(NS_ERROR_DOM_TYPE_MISMATCH_ERR);
+      return;
+  }
+
+  aArray.ComputeState();
+  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;
+  }
+
+  nsCOMPtr<nsIRandomGenerator> randomGenerator =
+      do_GetService("@mozilla.org/security/random-generator;1");
+  if (!randomGenerator) {
+    aRv.Throw(NS_ERROR_DOM_OPERATION_ERR);
+    return;
+  }
+
+  uint8_t* buf;
+  nsresult rv = randomGenerator->GenerateRandomBytes(dataLen, &buf);
+  if (NS_FAILED(rv) || !buf) {
+    aRv.Throw(NS_ERROR_DOM_OPERATION_ERR);
+    return;
+  }
+
+  // Copy random bytes to ABV.
+  memcpy(aArray.Data(), buf, dataLen);
+  free(buf);
+
+  aRetval.set(view);
+}
+
+void Crypto::RandomUUID(nsAString& 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);
+
+  // Convert UUID chars to UTF-16 retval, omitting the curly braces and NUL.
+  CopyASCIItoUTF16(Substring(uuidString.get() + 1, NSID_LENGTH - 3), aRetVal);
+  MOZ_ASSERT(aRetVal.Length() == NSID_LENGTH - 3);
+}
+
+SubtleCrypto* Crypto::Subtle() {
+  if (!mSubtle) {
+    mSubtle = new SubtleCrypto(GetParentObject());
+  }
+  return mSubtle;
+}
+
+}  // namespace mozilla::dom