keycard-go/apdu/command.go

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package apdu
import (
"bytes"
"encoding/binary"
)
type Command struct {
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Cla uint8
Ins uint8
P1 uint8
P2 uint8
Data []byte
Le uint8
requiresLe bool
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}
func NewCommand(cla, ins, p1, p2 uint8, data []byte) *Command {
return &Command{
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Cla: cla,
Ins: ins,
P1: p1,
P2: p2,
Data: data,
requiresLe: false,
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}
}
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func (c *Command) SetLE(le uint8) {
c.requiresLe = true
c.Le = le
}
func (c *Command) Serialize() ([]byte, error) {
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buf := new(bytes.Buffer)
if err := binary.Write(buf, binary.BigEndian, c.Cla); err != nil {
return nil, err
}
if err := binary.Write(buf, binary.BigEndian, c.Ins); err != nil {
return nil, err
}
if err := binary.Write(buf, binary.BigEndian, c.P1); err != nil {
return nil, err
}
if err := binary.Write(buf, binary.BigEndian, c.P2); err != nil {
return nil, err
}
if len(c.Data) > 0 {
if err := binary.Write(buf, binary.BigEndian, uint8(len(c.Data))); err != nil {
return nil, err
}
if err := binary.Write(buf, binary.BigEndian, c.Data); err != nil {
return nil, err
}
}
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if c.requiresLe {
if err := binary.Write(buf, binary.BigEndian, c.Le); err != nil {
return nil, err
}
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}
return buf.Bytes(), nil
}