1 files changed, 150 insertions, 0 deletions
diff --git a/dom/crypto/CryptoBuffer.cpp b/dom/crypto/CryptoBuffer.cpp
new file mode 100644
index 0000000000..67e1a8e56a
--- /dev/null
+++ b/dom/crypto/CryptoBuffer.cpp
@@ -0,0 +1,150 @@
+/* -*- 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 "CryptoBuffer.h"
+#include "secitem.h"
+#include "mozilla/Base64.h"
+#include "mozilla/dom/UnionTypes.h"
+
+namespace mozilla::dom {
+
+uint8_t* CryptoBuffer::Assign(const CryptoBuffer& aData) {
+  // Same as in nsTArray_Impl::operator=, but return the value
+  // returned from ReplaceElementsAt to enable OOM detection
+  return ReplaceElementsAt(0, Length(), aData.Elements(), aData.Length(),
+                           fallible);
+}
+
+uint8_t* CryptoBuffer::Assign(const uint8_t* aData, uint32_t aLength) {
+  return ReplaceElementsAt(0, Length(), aData, aLength, fallible);
+}
+
+uint8_t* CryptoBuffer::Assign(const nsACString& aString) {
+  return Assign(reinterpret_cast<uint8_t const*>(aString.BeginReading()),
+                aString.Length());
+}
+
+uint8_t* CryptoBuffer::Assign(const SECItem* aItem) {
+  MOZ_ASSERT(aItem);
+  return Assign(aItem->data, aItem->len);
+}
+
+uint8_t* CryptoBuffer::Assign(const nsTArray<uint8_t>& aData) {
+  return ReplaceElementsAt(0, Length(), aData.Elements(), aData.Length(),
+                           fallible);
+}
+
+uint8_t* CryptoBuffer::Assign(const ArrayBuffer& aData) {
+  Clear();
+  return aData.AppendDataTo(*this) ? Elements() : nullptr;
+}
+
+uint8_t* CryptoBuffer::Assign(const ArrayBufferView& aData) {
+  Clear();
+  return aData.AppendDataTo(*this) ? Elements() : nullptr;
+}
+
+uint8_t* CryptoBuffer::Assign(const ArrayBufferViewOrArrayBuffer& aData) {
+  Clear();
+
+  return AppendTypedArrayDataTo(aData, *this) ? Elements() : nullptr;
+}
+
+uint8_t* CryptoBuffer::Assign(const OwningArrayBufferViewOrArrayBuffer& aData) {
+  Clear();
+
+  return AppendTypedArrayDataTo(aData, *this) ? Elements() : nullptr;
+}
+
+uint8_t* CryptoBuffer::Assign(const Uint8Array& aArray) {
+  Clear();
+  return aArray.AppendDataTo(*this) ? Elements() : nullptr;
+}
+
+uint8_t* CryptoBuffer::AppendSECItem(const SECItem* aItem) {
+  MOZ_ASSERT(aItem);
+  return AppendElements(aItem->data, aItem->len, fallible);
+}
+
+uint8_t* CryptoBuffer::AppendSECItem(const SECItem& aItem) {
+  return AppendElements(aItem.data, aItem.len, fallible);
+}
+
+// Helpers to encode/decode JWK's special flavor of Base64
+// * No whitespace
+// * No padding
+// * URL-safe character set
+nsresult CryptoBuffer::FromJwkBase64(const nsString& aBase64) {
+  NS_ConvertUTF16toUTF8 temp(aBase64);
+  temp.StripWhitespace();
+
+  // JWK prohibits padding per RFC 7515, section 2.
+  nsresult rv =
+      Base64URLDecode(temp, Base64URLDecodePaddingPolicy::Reject, *this);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  return NS_OK;
+}
+
+nsresult CryptoBuffer::ToJwkBase64(nsString& aBase64) const {
+  // Shortcut for the empty octet string
+  if (Length() == 0) {
+    aBase64.Truncate();
+    return NS_OK;
+  }
+
+  nsAutoCString base64;
+  nsresult rv = Base64URLEncode(Length(), Elements(),
+                                Base64URLEncodePaddingPolicy::Omit, base64);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  CopyASCIItoUTF16(base64, aBase64);
+  return NS_OK;
+}
+
+bool CryptoBuffer::ToSECItem(PLArenaPool* aArena, SECItem* aItem) const {
+  aItem->type = siBuffer;
+  aItem->data = nullptr;
+
+  if (!::SECITEM_AllocItem(aArena, aItem, Length())) {
+    return false;
+  }
+  // If this CryptoBuffer is of 0 length, aItem->data will be null. Passing
+  // null to memcpy is not valid, even if the length is 0, so return early.
+  if (!aItem->data) {
+    MOZ_ASSERT(Length() == 0);
+    return true;
+  }
+  memcpy(aItem->data, Elements(), Length());
+  return true;
+}
+
+JSObject* CryptoBuffer::ToUint8Array(JSContext* aCx,
+                                     ErrorResult& aError) const {
+  return Uint8Array::Create(aCx, *this, aError);
+}
+
+JSObject* CryptoBuffer::ToArrayBuffer(JSContext* aCx,
+                                      ErrorResult& aError) const {
+  return ArrayBuffer::Create(aCx, *this, aError);
+}
+
+// "BigInt" comes from the WebCrypto spec
+// ("unsigned long" isn't very "big", of course)
+// Likewise, the spec calls for big-endian ints
+bool CryptoBuffer::GetBigIntValue(unsigned long& aRetVal) {
+  if (Length() > sizeof(aRetVal)) {
+    return false;
+  }
+
+  aRetVal = 0;
+  for (size_t i = 0; i < Length(); ++i) {
+    aRetVal = (aRetVal << 8) + ElementAt(i);
+  }
+  return true;
+}
+
+}  // namespace mozilla::dom