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-rw-r--r--dom/crypto/CryptoBuffer.cpp200
1 files changed, 200 insertions, 0 deletions
diff --git a/dom/crypto/CryptoBuffer.cpp b/dom/crypto/CryptoBuffer.cpp
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+++ b/dom/crypto/CryptoBuffer.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 "CryptoBuffer.h"
+#include "secitem.h"
+#include "mozilla/Base64.h"
+#include "mozilla/dom/UnionTypes.h"
+
+namespace mozilla {
+namespace 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 InfallibleTArray<uint8_t>& aData)
+{
+ return ReplaceElementsAt(0, Length(), aData.Elements(), aData.Length(),
+ fallible);
+}
+
+uint8_t*
+CryptoBuffer::Assign(const ArrayBuffer& aData)
+{
+ aData.ComputeLengthAndData();
+ return Assign(aData.Data(), aData.Length());
+}
+
+uint8_t*
+CryptoBuffer::Assign(const ArrayBufferView& aData)
+{
+ aData.ComputeLengthAndData();
+ return Assign(aData.Data(), aData.Length());
+}
+
+uint8_t*
+CryptoBuffer::Assign(const ArrayBufferViewOrArrayBuffer& aData)
+{
+ if (aData.IsArrayBufferView()) {
+ return Assign(aData.GetAsArrayBufferView());
+ } else if (aData.IsArrayBuffer()) {
+ return Assign(aData.GetAsArrayBuffer());
+ }
+
+ // If your union is uninitialized, something's wrong
+ MOZ_ASSERT(false);
+ Clear();
+ return nullptr;
+}
+
+uint8_t*
+CryptoBuffer::Assign(const OwningArrayBufferViewOrArrayBuffer& aData)
+{
+ if (aData.IsArrayBufferView()) {
+ return Assign(aData.GetAsArrayBufferView());
+ } else if (aData.IsArrayBuffer()) {
+ return Assign(aData.GetAsArrayBuffer());
+ }
+
+ // If your union is uninitialized, something's wrong
+ MOZ_ASSERT(false);
+ Clear();
+ return 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)
+{
+ // 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;
+ }
+
+ memcpy(aItem->data, Elements(), Length());
+ return true;
+}
+
+JSObject*
+CryptoBuffer::ToUint8Array(JSContext* aCx) const
+{
+ return Uint8Array::Create(aCx, Length(), Elements());
+}
+
+bool
+CryptoBuffer::ToNewUnsignedBuffer(uint8_t** aBuf, uint32_t* aBufLen) const
+{
+ MOZ_ASSERT(aBuf);
+ MOZ_ASSERT(aBufLen);
+
+ uint32_t dataLen = Length();
+ uint8_t* tmp = reinterpret_cast<uint8_t*>(moz_xmalloc(dataLen));
+ if (NS_WARN_IF(!tmp)) {
+ return false;
+ }
+
+ memcpy(tmp, Elements(), dataLen);
+ *aBuf = tmp;
+ *aBufLen = dataLen;
+ return true;
+}
+
+// "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 dom
+} // namespace mozilla