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// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_APDU_APDU_COMMAND_H_
#define COMPONENTS_APDU_APDU_COMMAND_H_
#include <cinttypes>
#include <utility>
#include <vector>
#include "base/component_export.h"
#include "base/containers/span.h"
#include "base/gtest_prod_util.h"
#include "third_party/abseil-cpp/absl/types/optional.h"
namespace apdu {
// APDU commands are defined as part of ISO 7816-4. Commands can be serialized
// into either short length encodings, where the maximum data length is 256
// bytes, or an extended length encoding, where the maximum data length is 65536
// bytes. This class implements only the extended length encoding. Serialized
// commands consist of a CLA byte, denoting the class of instruction, an INS
// byte, denoting the instruction code, P1 and P2, each one byte denoting
// instruction parameters, a length field (Lc), a data field of length Lc, and
// a maximum expected response length (Le).
class COMPONENT_EXPORT(APDU) ApduCommand {
public:
// Constructs an APDU command from the serialized message data.
static absl::optional<ApduCommand> CreateFromMessage(
base::span<const uint8_t> message);
ApduCommand();
ApduCommand(uint8_t cla,
uint8_t ins,
uint8_t p1,
uint8_t p2,
size_t response_length,
std::vector<uint8_t> data);
ApduCommand(ApduCommand&& that);
ApduCommand& operator=(ApduCommand&& that);
ApduCommand(const ApduCommand&) = delete;
ApduCommand& operator=(const ApduCommand&) = delete;
~ApduCommand();
// Returns serialized message data.
std::vector<uint8_t> GetEncodedCommand() const;
void set_cla(uint8_t cla) { cla_ = cla; }
void set_ins(uint8_t ins) { ins_ = ins; }
void set_p1(uint8_t p1) { p1_ = p1; }
void set_p2(uint8_t p2) { p2_ = p2; }
void set_data(std::vector<uint8_t> data) { data_ = std::move(data); }
void set_response_length(size_t response_length) {
response_length_ = response_length;
}
uint8_t cla() const { return cla_; }
uint8_t ins() const { return ins_; }
uint8_t p1() const { return p1_; }
uint8_t p2() const { return p2_; }
size_t response_length() const { return response_length_; }
const std::vector<uint8_t>& data() const { return data_; }
static constexpr size_t kApduMaxResponseLength = 65536;
private:
FRIEND_TEST_ALL_PREFIXES(ApduTest, TestDeserializeBasic);
FRIEND_TEST_ALL_PREFIXES(ApduTest, TestDeserializeComplex);
FRIEND_TEST_ALL_PREFIXES(ApduTest, TestSerializeEdgeCases);
static constexpr size_t kApduMinHeader = 4;
static constexpr size_t kApduMaxHeader = 7;
static constexpr size_t kApduCommandDataOffset = 7;
static constexpr size_t kApduCommandLengthOffset = 5;
// As defined in ISO7816-4, extended length APDU request data is limited to
// 16 bits in length with a maximum value of 65535. Response data length is
// also limited to 16 bits in length with a value of 0x0000 corresponding to
// a length of 65536.
static constexpr size_t kApduMaxDataLength = 65535;
static constexpr size_t kApduMaxLength =
kApduMaxDataLength + kApduMaxHeader + 2;
uint8_t cla_ = 0;
uint8_t ins_ = 0;
uint8_t p1_ = 0;
uint8_t p2_ = 0;
size_t response_length_ = 0;
std::vector<uint8_t> data_;
};
} // namespace apdu
#endif // COMPONENTS_APDU_APDU_COMMAND_H_
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