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/*
* Copyright (C) 2017 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "CryptoAlgorithmECDH.h"
#if ENABLE(WEB_CRYPTO)
#include "CryptoAlgorithmEcKeyParams.h"
#include "CryptoAlgorithmEcdhKeyDeriveParams.h"
#include "CryptoKeyEC.h"
#include "ScriptExecutionContext.h"
namespace WebCore {
Ref<CryptoAlgorithm> CryptoAlgorithmECDH::create()
{
return adoptRef(*new CryptoAlgorithmECDH);
}
CryptoAlgorithmIdentifier CryptoAlgorithmECDH::identifier() const
{
return s_identifier;
}
void CryptoAlgorithmECDH::generateKey(const CryptoAlgorithmParameters& parameters, bool extractable, CryptoKeyUsageBitmap usages, KeyOrKeyPairCallback&& callback, ExceptionCallback&& exceptionCallback, ScriptExecutionContext&)
{
const auto& ecParameters = downcast<CryptoAlgorithmEcKeyParams>(parameters);
if (usages & (CryptoKeyUsageEncrypt | CryptoKeyUsageDecrypt | CryptoKeyUsageSign | CryptoKeyUsageVerify | CryptoKeyUsageWrapKey | CryptoKeyUsageUnwrapKey)) {
exceptionCallback(SyntaxError);
return;
}
auto result = CryptoKeyEC::generatePair(CryptoAlgorithmIdentifier::ECDH, ecParameters.namedCurve, extractable, usages);
if (result.hasException()) {
exceptionCallback(result.releaseException().code());
return;
}
auto pair = result.releaseReturnValue();
pair.publicKey->setUsagesBitmap(0);
pair.privateKey->setUsagesBitmap(pair.privateKey->usagesBitmap() & (CryptoKeyUsageDeriveKey | CryptoKeyUsageDeriveBits));
callback(WTFMove(pair));
}
void CryptoAlgorithmECDH::deriveBits(const CryptoAlgorithmParameters& parameters, Ref<CryptoKey>&& baseKey, size_t length, VectorCallback&& callback, ExceptionCallback&& exceptionCallback, ScriptExecutionContext& context, WorkQueue& workQueue)
{
// We only accept length that is a multiple of 8.
if (length % 8) {
exceptionCallback(OperationError);
return;
}
auto& ecParameters = downcast<CryptoAlgorithmEcdhKeyDeriveParams>(parameters);
if (baseKey->type() != CryptoKey::Type::Private) {
exceptionCallback(InvalidAccessError);
return;
}
ASSERT(ecParameters.publicKey);
if (ecParameters.publicKey->type() != CryptoKey::Type::Public) {
exceptionCallback(InvalidAccessError);
return;
}
if (baseKey->algorithmIdentifier() != ecParameters.publicKey->algorithmIdentifier()) {
exceptionCallback(InvalidAccessError);
return;
}
auto& ecBaseKey = downcast<CryptoKeyEC>(baseKey.get());
auto& ecPublicKey = downcast<CryptoKeyEC>(*(ecParameters.publicKey.get()));
if (ecBaseKey.namedCurve() != ecPublicKey.namedCurve()) {
exceptionCallback(InvalidAccessError);
return;
}
auto unifiedCallback = [callback = WTFMove(callback), exceptionCallback = WTFMove(exceptionCallback)](Optional<Vector<uint8_t>>&& derivedKey, size_t length) mutable {
if (!derivedKey) {
exceptionCallback(OperationError);
return;
}
if (!length) {
callback(WTFMove(*derivedKey));
return;
}
if (length / 8 > (*derivedKey).size()) {
exceptionCallback(OperationError);
return;
}
(*derivedKey).shrink(length / 8);
callback(WTFMove(*derivedKey));
};
// This is a special case that can't use dispatchOperation() because it bundles
// the result validation and callback dispatch into unifiedCallback.
workQueue.dispatch(
[baseKey = WTFMove(baseKey), publicKey = ecParameters.publicKey, length, unifiedCallback = WTFMove(unifiedCallback), contextIdentifier = context.contextIdentifier()]() mutable {
auto derivedKey = platformDeriveBits(downcast<CryptoKeyEC>(baseKey.get()), downcast<CryptoKeyEC>(*publicKey));
ScriptExecutionContext::postTaskTo(contextIdentifier, [derivedKey = WTFMove(derivedKey), length, unifiedCallback = WTFMove(unifiedCallback)](auto&) mutable {
unifiedCallback(WTFMove(derivedKey), length);
});
});
}
void CryptoAlgorithmECDH::importKey(CryptoKeyFormat format, KeyData&& data, const CryptoAlgorithmParameters& parameters, bool extractable, CryptoKeyUsageBitmap usages, KeyCallback&& callback, ExceptionCallback&& exceptionCallback)
{
const auto& ecParameters = downcast<CryptoAlgorithmEcKeyParams>(parameters);
RefPtr<CryptoKeyEC> result;
switch (format) {
case CryptoKeyFormat::Jwk: {
JsonWebKey key = WTFMove(WTF::get<JsonWebKey>(data));
bool isUsagesAllowed = false;
if (!key.d.isNull()) {
isUsagesAllowed = isUsagesAllowed || !(usages ^ CryptoKeyUsageDeriveKey);
isUsagesAllowed = isUsagesAllowed || !(usages ^ CryptoKeyUsageDeriveBits);
isUsagesAllowed = isUsagesAllowed || !(usages ^ (CryptoKeyUsageDeriveKey | CryptoKeyUsageDeriveBits));
}
isUsagesAllowed = isUsagesAllowed || !usages;
if (!isUsagesAllowed) {
exceptionCallback(SyntaxError);
return;
}
if (usages && !key.use.isNull() && key.use != "enc") {
exceptionCallback(DataError);
return;
}
result = CryptoKeyEC::importJwk(ecParameters.identifier, ecParameters.namedCurve, WTFMove(key), extractable, usages);
break;
}
case CryptoKeyFormat::Raw:
if (usages) {
exceptionCallback(SyntaxError);
return;
}
result = CryptoKeyEC::importRaw(ecParameters.identifier, ecParameters.namedCurve, WTFMove(WTF::get<Vector<uint8_t>>(data)), extractable, usages);
break;
case CryptoKeyFormat::Spki:
if (usages) {
exceptionCallback(SyntaxError);
return;
}
result = CryptoKeyEC::importSpki(ecParameters.identifier, ecParameters.namedCurve, WTFMove(WTF::get<Vector<uint8_t>>(data)), extractable, usages);
break;
case CryptoKeyFormat::Pkcs8:
if (usages && (usages ^ CryptoKeyUsageDeriveKey) && (usages ^ CryptoKeyUsageDeriveBits) && (usages ^ (CryptoKeyUsageDeriveKey | CryptoKeyUsageDeriveBits))) {
exceptionCallback(SyntaxError);
return;
}
result = CryptoKeyEC::importPkcs8(ecParameters.identifier, ecParameters.namedCurve, WTFMove(WTF::get<Vector<uint8_t>>(data)), extractable, usages);
break;
}
if (!result) {
exceptionCallback(DataError);
return;
}
callback(*result);
}
void CryptoAlgorithmECDH::exportKey(CryptoKeyFormat format, Ref<CryptoKey>&& key, KeyDataCallback&& callback, ExceptionCallback&& exceptionCallback)
{
const auto& ecKey = downcast<CryptoKeyEC>(key.get());
if (!ecKey.keySizeInBits()) {
exceptionCallback(OperationError);
return;
}
KeyData result;
switch (format) {
case CryptoKeyFormat::Jwk: {
auto jwk = ecKey.exportJwk();
if (jwk.hasException()) {
exceptionCallback(jwk.releaseException().code());
return;
}
result = jwk.releaseReturnValue();
break;
}
case CryptoKeyFormat::Raw: {
auto raw = ecKey.exportRaw();
if (raw.hasException()) {
exceptionCallback(raw.releaseException().code());
return;
}
result = raw.releaseReturnValue();
break;
}
case CryptoKeyFormat::Spki: {
auto spki = ecKey.exportSpki();
if (spki.hasException()) {
exceptionCallback(spki.releaseException().code());
return;
}
result = spki.releaseReturnValue();
break;
}
case CryptoKeyFormat::Pkcs8: {
auto pkcs8 = ecKey.exportPkcs8();
if (pkcs8.hasException()) {
exceptionCallback(pkcs8.releaseException().code());
return;
}
result = pkcs8.releaseReturnValue();
break;
}
}
callback(format, WTFMove(result));
}
} // namespace WebCore
#endif // ENABLE(WEB_CRYPTO)