84 lines
No EOL
3.4 KiB
Kotlin
84 lines
No EOL
3.4 KiB
Kotlin
package com.tangem.tasks
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import com.tangem.CardEnvironment
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import com.tangem.commands.CheckWalletCommand
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import com.tangem.commands.EllipticCurve
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import com.tangem.commands.ReadCardCommand
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import com.tangem.commands.ReadCardResponse
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import com.tangem.crypto.generateRandomBytes
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import com.tangem.crypto.verify
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sealed class ScanEvent {
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data class OnReadEvent(val result: ReadCardResponse) : ScanEvent()
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data class OnVerifyEvent(val verified: Boolean) : ScanEvent()
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}
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internal class ScanTask : Task<ScanEvent>() {
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private lateinit var readCardData: ReadCardResponse
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private lateinit var challenge: ByteArray
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private lateinit var curve: EllipticCurve
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private lateinit var walletPublickKey: ByteArray
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override fun onRun(cardEnvironment: CardEnvironment,
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callback: (result: TaskEvent<ScanEvent>) -> Unit) {
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val readCommand = ReadCardCommand()
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sendCommand(readCommand, cardEnvironment) { readEvent ->
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when (readEvent) {
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is TaskEvent.Event -> {
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readCardData = readEvent.data
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callback(TaskEvent.Event(ScanEvent.OnReadEvent(readCardData)))
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if (readCardData.curve != null && readCardData.walletPublicKey != null) {
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curve = readCardData.curve!!
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walletPublickKey = readCardData.walletPublicKey!!
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} else {
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delegate?.closeNfcPopup()
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callback(TaskEvent.Completion(TaskError.CardError()))
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}
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val checkWalletCommand = prepareCheckWalletCommand(cardEnvironment)
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sendCommand(checkWalletCommand, cardEnvironment) { checkWalletEvent ->
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delegate?.closeNfcPopup()
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when (checkWalletEvent) {
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is TaskEvent.Event -> {
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val checkWalletResponse = checkWalletEvent.data
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val verified = verify(walletPublickKey,
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challenge + checkWalletResponse.salt,
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checkWalletResponse.walletSignature,
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curve)
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if (verified) {
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callback(TaskEvent.Event(ScanEvent.OnVerifyEvent(true)))
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callback(TaskEvent.Completion())
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} else {
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callback(TaskEvent.Completion(TaskError.VefificationFailed()))
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}
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}
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is TaskEvent.Completion ->
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if (checkWalletEvent.error != null)
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callback(TaskEvent.Completion(checkWalletEvent.error))
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}
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}
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}
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is TaskEvent.Completion ->
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if (readEvent.error != null) callback(TaskEvent.Completion(readEvent.error))
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}
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}
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}
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private fun prepareCheckWalletCommand(cardEnvironment: CardEnvironment): CheckWalletCommand {
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challenge = generateRandomBytes(16)
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return CheckWalletCommand(
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cardEnvironment.pin1,
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readCardData.cardId,
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challenge,
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byteArrayOf())
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}
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} |