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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 "mozilla/Base64.h"
#include "mozilla/dom/BufferSourceBinding.h"
#include "mozilla/dom/UnionTypes.h"
#include "secitem.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 BufferSource& aData) {
Clear();
return AppendTypedArrayDataTo(aData, *this) ? Elements() : nullptr;
}
uint8_t* CryptoBuffer::Assign(const OwningBufferSource& 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
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