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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you 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.
#include "parquet/encryption/internal_file_encryptor.h"
#include "parquet/encryption/encryption.h"
#include "parquet/encryption/encryption_internal.h"
namespace parquet {
// Encryptor
Encryptor::Encryptor(encryption::AesEncryptor* aes_encryptor, const std::string& key,
const std::string& file_aad, const std::string& aad,
::arrow::MemoryPool* pool)
: aes_encryptor_(aes_encryptor),
key_(key),
file_aad_(file_aad),
aad_(aad),
pool_(pool) {}
int Encryptor::CiphertextSizeDelta() { return aes_encryptor_->CiphertextSizeDelta(); }
int Encryptor::Encrypt(const uint8_t* plaintext, int plaintext_len, uint8_t* ciphertext) {
return aes_encryptor_->Encrypt(plaintext, plaintext_len, str2bytes(key_),
static_cast<int>(key_.size()), str2bytes(aad_),
static_cast<int>(aad_.size()), ciphertext);
}
// InternalFileEncryptor
InternalFileEncryptor::InternalFileEncryptor(FileEncryptionProperties* properties,
::arrow::MemoryPool* pool)
: properties_(properties), pool_(pool) {
if (properties_->is_utilized()) {
throw ParquetException("Re-using encryption properties for another file");
}
properties_->set_utilized();
}
void InternalFileEncryptor::WipeOutEncryptionKeys() {
properties_->WipeOutEncryptionKeys();
for (auto const& i : all_encryptors_) {
i->WipeOut();
}
}
std::shared_ptr<Encryptor> InternalFileEncryptor::GetFooterEncryptor() {
if (footer_encryptor_ != nullptr) {
return footer_encryptor_;
}
ParquetCipher::type algorithm = properties_->algorithm().algorithm;
std::string footer_aad = encryption::CreateFooterAad(properties_->file_aad());
std::string footer_key = properties_->footer_key();
auto aes_encryptor = GetMetaAesEncryptor(algorithm, footer_key.size());
footer_encryptor_ = std::make_shared<Encryptor>(
aes_encryptor, footer_key, properties_->file_aad(), footer_aad, pool_);
return footer_encryptor_;
}
std::shared_ptr<Encryptor> InternalFileEncryptor::GetFooterSigningEncryptor() {
if (footer_signing_encryptor_ != nullptr) {
return footer_signing_encryptor_;
}
ParquetCipher::type algorithm = properties_->algorithm().algorithm;
std::string footer_aad = encryption::CreateFooterAad(properties_->file_aad());
std::string footer_signing_key = properties_->footer_key();
auto aes_encryptor = GetMetaAesEncryptor(algorithm, footer_signing_key.size());
footer_signing_encryptor_ = std::make_shared<Encryptor>(
aes_encryptor, footer_signing_key, properties_->file_aad(), footer_aad, pool_);
return footer_signing_encryptor_;
}
std::shared_ptr<Encryptor> InternalFileEncryptor::GetColumnMetaEncryptor(
const std::string& column_path) {
return GetColumnEncryptor(column_path, true);
}
std::shared_ptr<Encryptor> InternalFileEncryptor::GetColumnDataEncryptor(
const std::string& column_path) {
return GetColumnEncryptor(column_path, false);
}
std::shared_ptr<Encryptor>
InternalFileEncryptor::InternalFileEncryptor::GetColumnEncryptor(
const std::string& column_path, bool metadata) {
// first look if we already got the encryptor from before
if (metadata) {
if (column_metadata_map_.find(column_path) != column_metadata_map_.end()) {
return column_metadata_map_.at(column_path);
}
} else {
if (column_data_map_.find(column_path) != column_data_map_.end()) {
return column_data_map_.at(column_path);
}
}
auto column_prop = properties_->column_encryption_properties(column_path);
if (column_prop == nullptr) {
return nullptr;
}
std::string key;
if (column_prop->is_encrypted_with_footer_key()) {
key = properties_->footer_key();
} else {
key = column_prop->key();
}
ParquetCipher::type algorithm = properties_->algorithm().algorithm;
auto aes_encryptor = metadata ? GetMetaAesEncryptor(algorithm, key.size())
: GetDataAesEncryptor(algorithm, key.size());
std::string file_aad = properties_->file_aad();
std::shared_ptr<Encryptor> encryptor =
std::make_shared<Encryptor>(aes_encryptor, key, file_aad, "", pool_);
if (metadata)
column_metadata_map_[column_path] = encryptor;
else
column_data_map_[column_path] = encryptor;
return encryptor;
}
int InternalFileEncryptor::MapKeyLenToEncryptorArrayIndex(int key_len) {
if (key_len == 16)
return 0;
else if (key_len == 24)
return 1;
else if (key_len == 32)
return 2;
throw ParquetException("encryption key must be 16, 24 or 32 bytes in length");
}
encryption::AesEncryptor* InternalFileEncryptor::GetMetaAesEncryptor(
ParquetCipher::type algorithm, size_t key_size) {
int key_len = static_cast<int>(key_size);
int index = MapKeyLenToEncryptorArrayIndex(key_len);
if (meta_encryptor_[index] == nullptr) {
meta_encryptor_[index].reset(
encryption::AesEncryptor::Make(algorithm, key_len, true, &all_encryptors_));
}
return meta_encryptor_[index].get();
}
encryption::AesEncryptor* InternalFileEncryptor::GetDataAesEncryptor(
ParquetCipher::type algorithm, size_t key_size) {
int key_len = static_cast<int>(key_size);
int index = MapKeyLenToEncryptorArrayIndex(key_len);
if (data_encryptor_[index] == nullptr) {
data_encryptor_[index].reset(
encryption::AesEncryptor::Make(algorithm, key_len, false, &all_encryptors_));
}
return data_encryptor_[index].get();
}
} // namespace parquet
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