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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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