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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 "mozilla/ClearOnShutdown.h"
#include "mozilla/ScopeExit.h"
#include "mozilla/TextUtils.h"
#include "mozilla/dom/ToJSValue.h"
#include "mprio.h"
#include "PrioEncoder.h"
namespace mozilla {
namespace dom {
/* static */
StaticRefPtr<PrioEncoder> PrioEncoder::sSingleton;
/* static */
PublicKey PrioEncoder::sPublicKeyA = nullptr;
/* static */
PublicKey PrioEncoder::sPublicKeyB = nullptr;
// Production keys from bug 1552315 comment#3
/* static */
const char* kDefaultKeyA =
"E780C1A9C50E3FC5A9B39469FCC92D62D2527BAE6AF76BBDEF128883FA400846";
/* static */
const char* kDefaultKeyB =
"F992B575840AEC202289FBF99D6C04FB2A37B1DA1CDEB1DF8036E1340D46C561";
PrioEncoder::PrioEncoder() = default;
PrioEncoder::~PrioEncoder() {
if (sPublicKeyA) {
PublicKey_clear(sPublicKeyA);
sPublicKeyA = nullptr;
}
if (sPublicKeyB) {
PublicKey_clear(sPublicKeyB);
sPublicKeyB = nullptr;
}
Prio_clear();
}
/* static */
void PrioEncoder::Encode(GlobalObject& aGlobal, const nsCString& aBatchID,
const PrioParams& aPrioParams,
RootedDictionary<PrioEncodedData>& aData,
ErrorResult& aRv) {
nsCOMPtr<nsIGlobalObject> global = do_QueryInterface(aGlobal.GetAsSupports());
if (!global) {
aRv.Throw(NS_ERROR_UNEXPECTED);
return;
}
nsCString aResult;
nsCString bResult;
nsresult rv = PrioEncoder::EncodeNative(aBatchID, aPrioParams.mBooleans,
aResult, bResult);
if (NS_FAILED(rv)) {
aRv.Throw(rv);
return;
}
nsTArray<uint8_t> arrayForServerA;
nsTArray<uint8_t> arrayForServerB;
if (!arrayForServerA.AppendElements(
reinterpret_cast<const uint8_t*>(aResult.BeginReading()),
aResult.Length(), fallible)) {
aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
return;
}
if (!arrayForServerB.AppendElements(
reinterpret_cast<const uint8_t*>(bResult.BeginReading()),
bResult.Length(), fallible)) {
aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
return;
}
JS::Rooted<JS::Value> valueA(aGlobal.Context());
if (!ToJSValue(aGlobal.Context(),
TypedArrayCreator<Uint8Array>(arrayForServerA), &valueA)) {
aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
return;
}
aData.mA.Construct().Init(&valueA.toObject());
JS::Rooted<JS::Value> valueB(aGlobal.Context());
if (!ToJSValue(aGlobal.Context(),
TypedArrayCreator<Uint8Array>(arrayForServerB), &valueB)) {
aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
return;
}
aData.mB.Construct().Init(&valueB.toObject());
}
/* static */
nsresult PrioEncoder::EncodeNative(const nsCString& aBatchID,
const nsTArray<bool>& aData,
nsCString& aResult, nsCString& bResult) {
SECStatus prio_rv = SECSuccess;
nsresult rv = PrioEncoder::LazyInitSingleton();
if (NS_FAILED(rv)) {
return rv;
}
if (aData.Length() > gNumBooleans) {
return NS_ERROR_INVALID_ARG;
}
PrioConfig prioConfig = PrioConfig_new(
aData.Length(), sPublicKeyA, sPublicKeyB,
reinterpret_cast<const unsigned char*>(aBatchID.BeginReading()),
aBatchID.Length());
if (!prioConfig) {
return NS_ERROR_FAILURE;
}
auto configGuard = MakeScopeExit([&] { PrioConfig_clear(prioConfig); });
unsigned char* forServerA = nullptr;
unsigned int lenA = 0;
unsigned char* forServerB = nullptr;
unsigned int lenB = 0;
prio_rv = PrioClient_encode(prioConfig, aData.Elements(), &forServerA, &lenA,
&forServerB, &lenB);
aResult.Adopt(reinterpret_cast<char*>(forServerA), lenA);
bResult.Adopt(reinterpret_cast<char*>(forServerB), lenB);
if (prio_rv != SECSuccess) {
return NS_ERROR_FAILURE;
}
return NS_OK;
}
bool PrioEncoder::IsValidHexPublicKey(mozilla::Span<const char> aStr) {
if (aStr.Length() != CURVE25519_KEY_LEN_HEX) {
return false;
}
for (auto c : aStr) {
if (!IsAsciiHexDigit(c)) {
return false;
}
}
return true;
}
/* static */
nsresult PrioEncoder::SetKeys(const char* aKeyA, const char* aKeyB) {
nsAutoCStringN<CURVE25519_KEY_LEN_HEX + 1> prioKeyA;
if (aKeyA == nullptr) {
prioKeyA = kDefaultKeyA;
} else {
prioKeyA = aKeyA;
}
nsAutoCStringN<CURVE25519_KEY_LEN_HEX + 1> prioKeyB;
if (aKeyB == nullptr) {
prioKeyB = kDefaultKeyB;
} else {
prioKeyB = aKeyB;
}
// Check that both public keys are of the right length
// and contain only hex digits 0-9a-fA-f
if (!PrioEncoder::IsValidHexPublicKey(prioKeyA) ||
!PrioEncoder::IsValidHexPublicKey(prioKeyB)) {
return NS_ERROR_UNEXPECTED;
}
SECStatus prio_rv = SECSuccess;
prio_rv = Prio_init();
if (prio_rv != SECSuccess) {
return NS_ERROR_UNEXPECTED;
}
prio_rv = PublicKey_import_hex(
&sPublicKeyA,
reinterpret_cast<const unsigned char*>(prioKeyA.BeginReading()),
CURVE25519_KEY_LEN_HEX);
if (prio_rv != SECSuccess) {
return NS_ERROR_UNEXPECTED;
}
prio_rv = PublicKey_import_hex(
&sPublicKeyB,
reinterpret_cast<const unsigned char*>(prioKeyB.BeginReading()),
CURVE25519_KEY_LEN_HEX);
if (prio_rv != SECSuccess) {
return NS_ERROR_UNEXPECTED;
}
return NS_OK;
}
/* static */
nsresult PrioEncoder::LazyInitSingleton() {
if (!sSingleton) {
// Init to the default keys.
nsresult rv = PrioEncoder::SetKeys();
if (!NS_SUCCEEDED(rv)) {
return rv;
}
sSingleton = new PrioEncoder();
ClearOnShutdown(&sSingleton);
}
return NS_OK;
}
} // namespace dom
} // namespace mozilla
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