55 lines
1.6 KiB
Go
55 lines
1.6 KiB
Go
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package io
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import (
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"github.com/ethereum/go-ethereum/log"
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"github.com/status-im/keycard-go/apdu"
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"github.com/status-im/keycard-go/globalplatform"
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"github.com/status-im/keycard-go/hexutils"
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)
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var logger = log.New("package", "io")
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// Transmitter defines an interface with one method to transmit raw commands and receive raw responses.
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type Transmitter interface {
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Transmit([]byte) ([]byte, error)
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}
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// NormalChannel implements a normal channel to send apdu commands and receive apdu responses.
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type NormalChannel struct {
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t Transmitter
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}
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// NewNormalChannel returns a new NormalChannel that sends commands to Transmitter t.
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func NewNormalChannel(t Transmitter) *NormalChannel {
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return &NormalChannel{t}
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}
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// Send sends apdu commands to the current Transmitter.
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// Based on the smartcard transport protocol (T=0, T=1), it checks responses and sends a Get Response
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// command in case of T=0.
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func (c *NormalChannel) Send(cmd *apdu.Command) (*apdu.Response, error) {
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rawCmd, err := cmd.Serialize()
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if err != nil {
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return nil, err
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}
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logger.Debug("apdu command", "hex", hexutils.BytesToHexWithSpaces(rawCmd))
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rawResp, err := c.t.Transmit(rawCmd)
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if err != nil {
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return nil, err
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}
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logger.Debug("apdu response", "hex", hexutils.BytesToHexWithSpaces(rawResp))
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resp, err := apdu.ParseResponse(rawResp)
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if err != nil {
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return nil, err
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}
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if resp.Sw1 == globalplatform.Sw1ResponseDataIncomplete && (cmd.Cla != globalplatform.ClaISO7816 || cmd.Ins != globalplatform.InsGetResponse) {
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getResponse := globalplatform.NewCommandGetResponse(resp.Sw2)
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return c.Send(getResponse)
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}
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return apdu.ParseResponse(rawResp)
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}
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