137 lines
5.7 KiB
C++
137 lines
5.7 KiB
C++
/*
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* Copyright 2020, The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <vector>
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#include <aidl/android/hardware/security/keymint/BnKeyMintOperation.h>
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#include <aidl/android/hardware/security/secureclock/ISecureClock.h>
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#include <hardware/keymaster_defs.h>
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#include "CborConverter.h"
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#include "JavacardSecureElement.h"
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#define AES_BLOCK_SIZE 16
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#define DES_BLOCK_SIZE 8
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#define RSA_BUFFER_SIZE 256
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#define EC_BUFFER_SIZE 32
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#define MAX_CHUNK_SIZE 256
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namespace aidl::android::hardware::security::keymint {
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using cppbor::Array;
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using cppbor::Item;
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using ::keymint::javacard::CborConverter;
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using ::keymint::javacard::Instruction;
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using ::keymint::javacard::JavacardSecureElement;
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using ::ndk::ScopedAStatus;
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using secureclock::TimeStampToken;
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using std::optional;
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using std::shared_ptr;
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using std::vector;
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// Bufferig modes for update
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enum class BufferingMode : int32_t {
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NONE = 0, // Send everything to javacard - most of the assymteric operations
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RSA_DECRYPT_OR_NO_DIGEST =
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1, // Buffer everything in update upto 256 bytes and send in finish. If
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// input data is greater then 256 bytes then it is an error. Javacard
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// will further check according to exact key size and crypto provider.
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EC_NO_DIGEST = 2, // Buffer upto 65 bytes and then truncate. Javacard will further truncate
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// upto exact keysize.
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BUF_AES_ENCRYPT_PKCS7_BLOCK_ALIGNED = 3, // Buffer 16 bytes.
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BUF_AES_DECRYPT_PKCS7_BLOCK_ALIGNED = 4, // Buffer 16 bytes.
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BUF_DES_ENCRYPT_PKCS7_BLOCK_ALIGNED = 5, // Buffer 8 bytes.
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BUF_DES_DECRYPT_PKCS7_BLOCK_ALIGNED = 6, // Buffer 8 bytes.
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BUF_AES_GCM_DECRYPT_BLOCK_ALIGNED = 7, // Buffer 16 bytes.
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};
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// The is the view in the input data being processed by update/finish funcion.
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struct DataView {
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vector<uint8_t> buffer; // previously buffered data from cycle n-1
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const vector<uint8_t>& data; // current data in cycle n.
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uint32_t start; // start of the view
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size_t length; // length of the view
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};
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class JavacardKeyMintOperation : public BnKeyMintOperation {
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public:
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explicit JavacardKeyMintOperation(keymaster_operation_handle_t opHandle,
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BufferingMode bufferingMode, uint16_t macLength,
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shared_ptr<JavacardSecureElement> card)
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: buffer_(vector<uint8_t>()), bufferingMode_(bufferingMode), macLength_(macLength),
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card_(card), opHandle_(opHandle) {}
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virtual ~JavacardKeyMintOperation();
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ScopedAStatus updateAad(const vector<uint8_t>& input,
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const optional<HardwareAuthToken>& authToken,
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const optional<TimeStampToken>& timestampToken) override;
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ScopedAStatus update(const vector<uint8_t>& input, const optional<HardwareAuthToken>& authToken,
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const optional<TimeStampToken>& timestampToken,
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vector<uint8_t>* output) override;
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ScopedAStatus finish(const optional<vector<uint8_t>>& input,
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const optional<vector<uint8_t>>& signature,
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const optional<HardwareAuthToken>& authToken,
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const optional<TimeStampToken>& timestampToken,
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const optional<vector<uint8_t>>& confirmationToken,
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vector<uint8_t>* output) override;
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ScopedAStatus abort() override;
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private:
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vector<uint8_t> popNextChunk(DataView& view, uint32_t chunkSize);
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keymaster_error_t updateInChunks(DataView& data, HardwareAuthToken& authToken,
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TimeStampToken& timestampToken, vector<uint8_t>* output);
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keymaster_error_t sendFinish(const vector<uint8_t>& data, const vector<uint8_t>& signature,
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const HardwareAuthToken& authToken,
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const TimeStampToken& timestampToken,
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const vector<uint8_t>& confToken, vector<uint8_t>& output);
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keymaster_error_t sendUpdate(const vector<uint8_t>& data, const HardwareAuthToken& authToken,
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const TimeStampToken& timestampToken, vector<uint8_t>& output);
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inline void appendBufferedData(DataView& view) {
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if (!buffer_.empty()) {
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view.buffer = buffer_;
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view.length = view.length + buffer_.size();
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view.start = 0;
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// view.buffer = insert(data.begin(), buffer_.begin(), buffer_.end());
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buffer_.clear();
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}
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}
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std::tuple<std::unique_ptr<Item>, keymaster_error_t> sendRequest(Instruction ins,
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Array& request);
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keymaster_error_t bufferData(DataView& data);
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void blockAlign(DataView& data, uint16_t blockSize);
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uint16_t getDataViewOffset(DataView& view, uint16_t blockSize);
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vector<uint8_t> buffer_;
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BufferingMode bufferingMode_;
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uint16_t macLength_;
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const shared_ptr<JavacardSecureElement> card_;
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keymaster_operation_handle_t opHandle_;
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CborConverter cbor_;
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};
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} // namespace aidl::android::hardware::security::keymint
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