98 lines
1.8 KiB
Go
98 lines
1.8 KiB
Go
package globalplatform
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import (
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"github.com/status-im/status-go/smartcard/apdu"
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"github.com/status-im/status-go/smartcard/globalplatform/crypto"
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)
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const (
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ClaISO7816 = uint8(0x00)
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ClaGp = uint8(0x80)
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ClaMac = uint8(0x84)
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InsSelect = uint8(0xA4)
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InsInitializeUpdate = uint8(0x50)
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InsExternalAuthenticate = uint8(0x82)
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InsGetResponse = uint8(0xC0)
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InsDelete = uint8(0xE4)
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Sw1ResponseDataIncomplete = uint8(0x61)
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tagDeleteAID = byte(0x4F)
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)
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func NewCommandSelect(aid []byte) *apdu.Command {
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c := apdu.NewCommand(
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ClaISO7816,
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InsSelect,
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uint8(0x04),
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uint8(0x00),
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aid,
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)
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c.SetLe(0x00)
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return c
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}
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func NewCommandInitializeUpdate(challenge []byte) *apdu.Command {
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return apdu.NewCommand(
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ClaGp,
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InsInitializeUpdate,
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uint8(0x00),
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uint8(0x00),
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challenge,
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)
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}
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func NewCommandExternalAuthenticate(encKey, cardChallenge, hostChallenge []byte) (*apdu.Command, error) {
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hostCryptogram, err := calculateHostCryptogram(encKey, cardChallenge, hostChallenge)
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if err != nil {
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return nil, err
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}
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return apdu.NewCommand(
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ClaMac,
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InsExternalAuthenticate,
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uint8(0x01), // C-MAC
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uint8(0x00),
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hostCryptogram,
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), nil
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}
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func NewCommandGetResponse(length uint8) *apdu.Command {
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c := apdu.NewCommand(
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ClaISO7816,
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InsGetResponse,
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uint8(0),
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uint8(0),
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nil,
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)
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c.SetLe(length)
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return c
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}
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func NewCommandDelete(aid []byte) *apdu.Command {
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data := []byte{tagDeleteAID, byte(len(aid))}
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data = append(data, aid...)
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return apdu.NewCommand(
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ClaGp,
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InsDelete,
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uint8(0x00),
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uint8(0x00),
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data,
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)
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}
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func calculateHostCryptogram(encKey, cardChallenge, hostChallenge []byte) ([]byte, error) {
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var data []byte
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data = append(data, cardChallenge...)
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data = append(data, hostChallenge...)
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data = crypto.AppendDESPadding(data)
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return crypto.Mac3DES(encKey, data, crypto.NullBytes8)
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}
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