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/*
* Copyright (c) 2015 - 2018 Samsung Electronics Co., Ltd All Rights Reserved
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License
*/
/*
* @file store.cpp
* @author Lukasz Kostyra (l.kostyra@samsung.com)
* @version 1.0
*/
#include <generic-backend/exception.h>
#include <generic-backend/crypto-params.h>
#include <tz-backend/obj.h>
#include <tz-backend/store.h>
#include <tz-backend/internals.h>
#include <dpl/log/log.h>
#include <message-buffer.h>
namespace CKM {
namespace Crypto {
namespace TZ {
namespace {
template <typename T, typename ...Args>
std::unique_ptr<T> make_unique(Args &&...args)
{
return std::unique_ptr<T>(new T(std::forward<Args>(args)...));
}
// internal SW encryption scheme flags
enum EncryptionScheme {
NONE = 0,
PASSWORD = 1 << 0
};
void unpack(const RawBuffer &packed,
int &scheme,
RawBuffer &data,
RawBuffer &iv,
RawBuffer &tag)
{
MessageBuffer buffer;
buffer.Push(packed);
buffer.Deserialize(scheme);
if (scheme == EncryptionScheme::PASSWORD) {
buffer.Deserialize(data, iv, tag);
} else {
buffer.Deserialize(data);
}
}
RawBuffer unpackData(const RawBuffer &packed)
{
MessageBuffer buffer;
buffer.Push(packed);
int scheme;
buffer.Deserialize(scheme);
RawBuffer data;
buffer.Deserialize(data);
return data;
}
RawBuffer pack(const RawBuffer &keyId, const Password &pwd,
const RawBuffer &iv, const RawBuffer &tag)
{
// determine whether the key is password protected and store schema info
// we don't need to additionally encrypt key ID
int scheme = pwd.empty() ? EncryptionScheme::NONE : EncryptionScheme::PASSWORD;
if (scheme == EncryptionScheme::PASSWORD) {
return MessageBuffer::Serialize(scheme, keyId, iv, tag).Pop();
} else {
return MessageBuffer::Serialize(scheme, keyId).Pop();
}
}
} // namespace
Store::Store(CryptoBackend backendId) :
GStore(backendId)
{
}
GObjUPtr Store::getObject(const Token &token, const Password &pass)
{
int scheme;
RawBuffer id;
RawBuffer iv;
RawBuffer tag;
unpack(token.data, scheme, id, iv, tag);
// TODO AKeys
if (token.dataType.isSKey())
return make_unique<SKey>(scheme, id, Pwd(pass, iv, tag), token.dataType);
// TODO certificate/chaincert
if (token.dataType.isBinaryData()) {
RawBuffer exported_data = Internals::getData(id, Pwd(pass, iv, tag));
return make_unique<BData>(std::move(exported_data));
}
ThrowErr(Exc::Crypto::DataTypeNotSupported,
"This type of data is not supported by trustzone backend: ", (int)token.dataType);
}
TokenPair Store::generateAKey(const CryptoAlgorithm &, const Password &,
const Password &)
{
ThrowErr(Exc::Crypto::OperationNotSupported,
"AKey operations are not implemented on TrustZone backend!");
}
Token Store::generateSKey(const CryptoAlgorithm &alg, const Password &pass)
{
RawBuffer iv;
RawBuffer tag;
if (!pass.empty()) {
// IV is needed for key encryption
iv = Internals::generateIV();
}
Data ret = Internals::generateSKey(alg, pass, iv, tag);
return Token(m_backendId, ret.type, pack(ret.data, pass, iv, tag));
}
Token Store::import(const Data &data, const Password &pass, const RawBuffer &encIV)
{
if (!data.type.isBinaryData() && !data.type.isSKey())
ThrowErr(Exc::Crypto::DataTypeNotSupported, "Invalid data provided for import");
RawBuffer passIV;
RawBuffer tag;
if (!pass.empty()) {
// IV is needed for data encryption with pwd
passIV = Internals::generateIV();
}
RawBuffer dataId = Internals::importData(data, encIV, pass, passIV, tag);
return Token(m_backendId, data.type, pack(dataId, pass, passIV, tag));
}
void Store::destroy(const Token &token)
{
RawBuffer id = unpackData(token.data);
if (token.dataType.isBinaryData()) {
// TODO this should be a generic "destroy persistent memory object" once
// serialization in key-manager-ta is unified
Internals::destroyData(id);
}
Internals::destroyKey(id);
}
} // namespace TZ
} // namespace Crypto
} // namespace CKM
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