88 lines
2.6 KiB
Go
88 lines
2.6 KiB
Go
// Copyright 2018 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package scwallet
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import (
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"bytes"
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"encoding/binary"
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"fmt"
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)
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// commandAPDU represents an application data unit sent to a smartcard.
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type commandAPDU struct {
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Cla, Ins, P1, P2 uint8 // Class, Instruction, Parameter 1, Parameter 2
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Data []byte // Command data
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Le uint8 // Command data length
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}
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// serialize serializes a command APDU.
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func (ca commandAPDU) serialize() ([]byte, error) {
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buf := new(bytes.Buffer)
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if err := binary.Write(buf, binary.BigEndian, ca.Cla); err != nil {
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return nil, err
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}
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if err := binary.Write(buf, binary.BigEndian, ca.Ins); err != nil {
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return nil, err
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}
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if err := binary.Write(buf, binary.BigEndian, ca.P1); err != nil {
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return nil, err
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}
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if err := binary.Write(buf, binary.BigEndian, ca.P2); err != nil {
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return nil, err
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}
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if len(ca.Data) > 0 {
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if err := binary.Write(buf, binary.BigEndian, uint8(len(ca.Data))); err != nil {
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return nil, err
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}
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if err := binary.Write(buf, binary.BigEndian, ca.Data); err != nil {
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return nil, err
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}
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}
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if err := binary.Write(buf, binary.BigEndian, ca.Le); err != nil {
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return nil, err
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}
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return buf.Bytes(), nil
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}
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// responseAPDU represents an application data unit received from a smart card.
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type responseAPDU struct {
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Data []byte // response data
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Sw1, Sw2 uint8 // status words 1 and 2
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}
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// deserialize deserializes a response APDU.
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func (ra *responseAPDU) deserialize(data []byte) error {
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if len(data) < 2 {
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return fmt.Errorf("can not deserialize data: payload too short (%d < 2)", len(data))
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}
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ra.Data = make([]byte, len(data)-2)
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buf := bytes.NewReader(data)
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if err := binary.Read(buf, binary.BigEndian, &ra.Data); err != nil {
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return err
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}
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if err := binary.Read(buf, binary.BigEndian, &ra.Sw1); err != nil {
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return err
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}
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if err := binary.Read(buf, binary.BigEndian, &ra.Sw2); err != nil {
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return err
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}
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return nil
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}
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