arti/Estonian-ID-card-mobile-authenticator-POC
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Merge remote-tracking branch 'origin/Tests' into Tests

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# Conflicts:
#	MobileAuthApp/app/src/androidTest/java/com/tarkvaraprojekt/mobileauthapp/UC4Test.kt
#	MobileAuthApp/app/src/main/java/com/tarkvaraprojekt/mobileauthapp/AuthFragment.kt
#	MobileAuthApp/app/src/main/java/com/tarkvaraprojekt/mobileauthapp/NFC/Comms.java
This commit is contained in:
stargateprovider 2021-12-04 21:55:40 +02:00
commit 67ba0ed764
2 changed files with 167 additions and 261 deletions
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94
MobileAuthApp/app/src/main/java/com/tarkvaraprojekt/mobileauthapp/AuthFragment.kt
View File

@ -1,13 +1,10 @@
package com.tarkvaraprojekt.mobileauthapp
import android.app.Activity
import android.content.Context
import android.content.Intent
import android.nfc.NfcAdapter
import android.nfc.tech.IsoDep
import android.os.Bundle
import android.os.CountDownTimer
import android.util.Log
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
@ -17,11 +14,14 @@ import androidx.fragment.app.activityViewModels
import androidx.navigation.fragment.findNavController
import androidx.navigation.fragment.navArgs
import com.tarkvaraprojekt.mobileauthapp.NFC.Comms
import com.tarkvaraprojekt.mobileauthapp.auth.Authenticator
import com.tarkvaraprojekt.mobileauthapp.auth.AuthAppException
import com.tarkvaraprojekt.mobileauthapp.auth.InvalidCANException
import com.tarkvaraprojekt.mobileauthapp.databinding.FragmentAuthBinding
import com.tarkvaraprojekt.mobileauthapp.model.ParametersViewModel
import com.tarkvaraprojekt.mobileauthapp.model.SmartCardViewModel
import java.io.IOException
import java.lang.Exception
import java.security.GeneralSecurityException
import kotlin.system.exitProcess
/**
@ -69,7 +69,6 @@ class AuthFragment : Fragment() {
goToTheStart()
}
}.start()
//binding!!.nextButton.visibility = View.INVISIBLE
binding!!.nextButton.setOnClickListener { goToNextFragment() }
binding!!.cancelButton.setOnClickListener { goToTheStart() }
val adapter = NfcAdapter.getDefaultAdapter(activity)
@ -78,24 +77,19 @@ class AuthFragment : Fragment() {
}
private fun getInfoFromIdCard(adapter: NfcAdapter) {
adapter.enableReaderMode(activity, { tag ->
timer.cancel()
requireActivity().runOnUiThread {
binding!!.timeCounter.text = getString(R.string.card_detected)
}
val card = IsoDep.get(tag)
card.timeout = 32768
card.use {
try {
val comms = Comms(it, viewModel.userCan)
if (args.auth) {
val jws = Authenticator(comms).authenticate(
intentParameters.challenge,
intentParameters.origin,
viewModel.userPin
)
intentParameters.setToken(jws)
} else {
if (args.reading) {
adapter.enableReaderMode(activity, { tag ->
timer.cancel()
requireActivity().runOnUiThread {
binding!!.timeCounter.text = getString(R.string.card_detected)
}
var msgCode = 0
val card = IsoDep.get(tag)
card.timeout = 32768
card.use {
try {
val comms = Comms(it, viewModel.userCan)
val response = comms.readPersonalData(byteArrayOf(1, 2, 6, 3, 4, 8))
viewModel.setUserFirstName(response[1])
viewModel.setUserLastName(response[0])
@ -103,24 +97,45 @@ class AuthFragment : Fragment() {
viewModel.setGender(response[3])
viewModel.setCitizenship(response[4])
viewModel.setExpiration(response[5])
requireActivity().runOnUiThread {
binding!!.timeCounter.text = getString(R.string.data_read)
}
} catch (e: android.nfc.TagLostException) {
msgCode = R.string.tag_lost
} catch (e: InvalidCANException) {
msgCode = R.string.invalid_can
// If the CAN is wrong we will also delete the saved CAN so that the user won't use it again.
viewModel.deleteCan(requireContext())
} catch (e: AuthAppException) {
msgCode = when (e.code) {
448 -> R.string.err_bad_data
500 -> R.string.err_internal
else -> R.string.err_unknown
}
} catch (e: GeneralSecurityException) {
msgCode = R.string.err_internal
} catch (e: IOException) {
msgCode = R.string.err_reading_card
} catch (e: Exception) {
msgCode = R.string.err_unknown
} finally {
adapter.disableReaderMode(activity)
}
requireActivity().runOnUiThread {
binding!!.timeCounter.text = getString(R.string.data_read)
if (msgCode != 0) {
requireActivity().runOnUiThread {
binding!!.timeCounter.text = getString(msgCode)
}
// Gives user some time to read the error message
Thread.sleep(1000)
goToTheStart()
}
} catch (e: Exception) {
requireActivity().runOnUiThread {
binding!!.timeCounter.text = getString(R.string.no_success)
}
// If the CAN is wrong we will also delete the saved CAN so that the user won't use it again.
viewModel.deleteCan(requireContext())
// Gives user some time to read the error message
Thread.sleep(1000)
goToTheStart()
} finally {
adapter.disableReaderMode(activity)
}
}
}, NfcAdapter.FLAG_READER_NFC_A, null)
}, NfcAdapter.FLAG_READER_NFC_A, null)
} else { //We want to create a JWT instead of reading the info from the card.
goToNextFragment()
}
}
private fun goToNextFragment() {
@ -141,7 +156,8 @@ class AuthFragment : Fragment() {
} else {
if (!args.mobile) {
//Currently for some reason the activity is not killed entirely. Must be looked into further.
requireActivity().finishAndRemoveTask()
requireActivity().finish()
exitProcess(0)
} else {
val resultIntent = Intent()
requireActivity().setResult(AppCompatActivity.RESULT_CANCELED, resultIntent)

334
MobileAuthApp/app/src/main/java/com/tarkvaraprojekt/mobileauthapp/NFC/Comms.java
View File

@ -3,6 +3,9 @@ package com.tarkvaraprojekt.mobileauthapp.NFC;
import android.nfc.tech.IsoDep;
import android.util.Log;
import com.tarkvaraprojekt.mobileauthapp.auth.AuthAppException;
import com.tarkvaraprojekt.mobileauthapp.auth.InvalidCANException;
import org.bouncycastle.crypto.BlockCipher;
import org.bouncycastle.crypto.engines.AESEngine;
import org.bouncycastle.crypto.macs.CMac;
@ -21,7 +24,6 @@ import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.util.Arrays;
import java.util.Base64;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
@ -31,43 +33,47 @@ import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
public class Comms {
private static final byte[] master = { // select Main AID
0, -92, 4, 12, 16, -96, 0, 0, 0, 119, 1, 8, 0, 7, 0, 0, -2, 0, 0, 1, 0
};
private static final byte[] selectMaster = Hex.decode("00a4040c10a000000077010800070000fe00000100");
private static final byte[] MSESetAT = { // manage security environment: set authentication template
0, 34, -63, -92, 15, -128, 10, 4, 0, 127, 0, 7, 2, 2, 4, 2, 4, -125, 1, 2, 0
};
private static final byte[] MSESetAT = Hex.decode("0022c1a40f800a04007f0007020204020483010200");
private static final byte[] GAGetNonce = { // general authenticate: get nonce
16, -122, 0, 0, 2, 124, 0, 0
};
private static final byte[] GAGetNonce = Hex.decode("10860000027c0000");
private static final byte[] GAMapNonceIncomplete = {
16, -122, 0, 0, 69, 124, 67, -127, 65
};
private static final byte[] GAMapNonceIncomplete = Hex.decode("10860000457c438141");
private static final byte[] GAKeyAgreementIncomplete = {
16, -122, 0, 0, 69, 124, 67, -125, 65
};
private static final byte[] GAKeyAgreementIncomplete = Hex.decode("10860000457c438341");
private static final byte[] GAMutualAuthenticationIncomplete = {
0, -122, 0, 0, 12, 124, 10, -123, 8
};
private static final byte[] GAMutualAuthenticationIncomplete = Hex.decode("008600000c7c0a8508");
private static final byte[] dataForMACIncomplete = {
127, 73, 79, 6, 10, 4, 0, 127, 0, 7, 2, 2, 4, 2, 4, -122, 65
};
private static final byte[] dataForMACIncomplete = Hex.decode("7f494f060a04007f000702020402048641");
private static final byte[] masterSec = {
12, -92, 4, 12, 45, -121, 33, 1
};
private static final byte[] selectFile = Hex.decode("0ca4010c1d871101");
private static final byte[] personal = { // select personal data DF
12, -92, 1, 12, 29, -121, 17, 1
};
private static final byte[] readFile = Hex.decode("0cb000000d970100");
private static final byte[] read = { // read binary
12, -80, 0, 0, 13, -105, 1, 0
};
private static final byte[] verifyPIN1 = Hex.decode("0c2000011d871101");
private static final byte[] verifyPIN2 = Hex.decode("0c2000851d871101");
private static final byte[] MSESetEnv = Hex.decode("0c2241A41d871101");
private static final byte[] Env = Hex.decode("8004FF200800840181");
private static final byte[] InternalAuthenticate = Hex.decode("0c8800001d871101");
private static final byte[] IASECCFID = {0x3f, 0x00};
private static final byte[] personalDF = {0x50, 0x00};
private static final byte[] AWP = {(byte) 0xad, (byte) 0xf1};
private static final byte[] QSCD = {(byte) 0xad, (byte) 0xf2};
private static final byte[] authCert = {0x34, 0x01};
private static final byte[] signCert = {0x34, 0x1f};
private final IsoDep idCard;
private IsoDep idCard;
private final byte[] keyEnc;
private final byte[] keyMAC;
private byte ssc; // Send sequence counter.
@ -81,12 +87,21 @@ public class Comms {
public Comms(IsoDep idCard, String CAN) throws IOException, NoSuchPaddingException, InvalidKeyException, NoSuchAlgorithmException, IllegalBlockSizeException, BadPaddingException, InvalidAlgorithmParameterException {
idCard.connect();
this.idCard = idCard;
byte[][] keys = PACE(CAN.getBytes(StandardCharsets.UTF_8));
long start = System.currentTimeMillis();
byte[][] keys = PACE(CAN);
Log.i("Pace duration", String.valueOf(System.currentTimeMillis() - start));
keyEnc = keys[0];
keyMAC = keys[1];
}
public byte[] getAuthenticationCertificate() {
return new byte[0];
}
/**
* Calculates the message authentication code
*
@ -139,51 +154,40 @@ public class Comms {
* @param CAN the card access number provided by the user
* @return the decrypted nonce
*/
private byte[] decryptNonce(byte[] encryptedNonce, byte[] CAN) throws NoSuchPaddingException, InvalidKeyException, NoSuchAlgorithmException, IllegalBlockSizeException, BadPaddingException, InvalidAlgorithmParameterException {
byte[] decryptionKey = createKey(CAN, (byte) 3);
private byte[] decryptNonce(byte[] encryptedNonce, String CAN) throws NoSuchPaddingException, InvalidKeyException, NoSuchAlgorithmException, IllegalBlockSizeException, BadPaddingException, InvalidAlgorithmParameterException {
byte[] decryptionKey = createKey(CAN.getBytes(StandardCharsets.UTF_8), (byte) 3);
Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(decryptionKey, "AES"), new IvParameterSpec(new byte[16]));
return cipher.doFinal(encryptedNonce);
}
/**
* Communicates with the card and logs the response
*
* @param APDU The command
* @param log Information for logging
* @return The response
*/
private byte[] getResponse(byte[] APDU, String log) throws IOException {
byte[] response = idCard.transceive(APDU);
if (response[response.length - 2] != (byte) 0x90 || response[response.length - 1] != 0x00) {
throw new RuntimeException(String.format("%s failed.", log));
}
Log.i(log, Hex.toHexString(response));
return response;
}
/**
* Attempts to use the PACE protocol to create a secure channel with an Estonian ID-card
*
* @param CAN the card access number
*/
private byte[][] PACE(byte[] CAN) throws IOException, NoSuchPaddingException, InvalidAlgorithmParameterException, NoSuchAlgorithmException, IllegalBlockSizeException, BadPaddingException, InvalidKeyException {
private byte[][] PACE(String CAN) throws IOException, NoSuchPaddingException, InvalidAlgorithmParameterException, NoSuchAlgorithmException, IllegalBlockSizeException, BadPaddingException, InvalidKeyException {
// select the IAS-ECC application on the chip
getResponse(selectMaster, "Select the master application");
// select the ECC applet on the chip
byte[] response = idCard.transceive(master);
Log.i("Select applet", Hex.toHexString(response));
// initiate PACE
getResponse(MSESetAT, "Set authentication template");
response = idCard.transceive(MSESetAT);
Log.i("Authentication template", Hex.toHexString(response));
// get nonce
byte[] response = getResponse(GAGetNonce, "Get nonce");
response = idCard.transceive(GAGetNonce);
Log.i("Get nonce", Hex.toHexString(response));
byte[] decryptedNonce = decryptNonce(Arrays.copyOfRange(response, 4, response.length - 2), CAN);
// generate an EC keypair and exchange public keys with the chip
ECNamedCurveParameterSpec spec = ECNamedCurveTable.getParameterSpec("secp256r1");
BigInteger privateKey = new BigInteger(255, new SecureRandom()).add(BigInteger.ONE); // should be in [1, spec.getN()-1], but this is good enough for this application
ECPoint publicKey = spec.getG().multiply(privateKey).normalize();
response = getResponse(createAPDU(GAMapNonceIncomplete, publicKey.getEncoded(false), 66), "Map nonce");
byte[] APDU = createAPDU(GAMapNonceIncomplete, publicKey.getEncoded(false), 66);
response = idCard.transceive(APDU);
Log.i("Map nonce", Hex.toHexString(response));
ECPoint cardPublicKey = spec.getCurve().decodePoint(Arrays.copyOfRange(response, 4, 69));
// calculate the new base point, use it to generate a new keypair, and exchange public keys
@ -191,41 +195,35 @@ public class Comms {
ECPoint mappedECBasePoint = spec.getG().multiply(new BigInteger(1, decryptedNonce)).add(sharedSecret).normalize();
privateKey = new BigInteger(255, new SecureRandom()).add(BigInteger.ONE);
publicKey = mappedECBasePoint.multiply(privateKey).normalize();
response = getResponse(createAPDU(GAKeyAgreementIncomplete, publicKey.getEncoded(false), 66), "Key agreement");
APDU = createAPDU(GAKeyAgreementIncomplete, publicKey.getEncoded(false), 66);
response = idCard.transceive(APDU);
Log.i("Key agreement", Hex.toHexString(response));
cardPublicKey = spec.getCurve().decodePoint(Arrays.copyOfRange(response, 4, 69));
// generate the session keys and exchange MACs to verify them
byte[] secret = cardPublicKey.multiply(privateKey).normalize().getAffineXCoord().getEncoded();
byte[] keyEnc = createKey(secret, (byte) 1);
byte[] keyMAC = createKey(secret, (byte) 2);
byte[] MAC = getMAC(createAPDU(dataForMACIncomplete, cardPublicKey.getEncoded(false), 65), keyMAC);
response = getResponse(createAPDU(GAMutualAuthenticationIncomplete, MAC, 9), "Mutual authentication");
sharedSecret = cardPublicKey.multiply(privateKey).normalize();
byte[] encodedSecret = sharedSecret.getAffineXCoord().getEncoded();
byte[] keyEnc = createKey(encodedSecret, (byte) 1);
byte[] keyMAC = createKey(encodedSecret, (byte) 2);
APDU = createAPDU(dataForMACIncomplete, cardPublicKey.getEncoded(false), 65);
byte[] MAC = getMAC(APDU, keyMAC);
APDU = createAPDU(GAMutualAuthenticationIncomplete, MAC, 9);
response = idCard.transceive(APDU);
Log.i("Mutual authentication", Hex.toHexString(response));
// verify chip's MAC and return session keys
MAC = getMAC(createAPDU(dataForMACIncomplete, publicKey.getEncoded(false), 65), keyMAC);
// if the chip-side verification fails, crash and burn
if (response.length == 2) throw new InvalidCANException();
// otherwise verify chip's MAC and return session keys
APDU = createAPDU(dataForMACIncomplete, publicKey.getEncoded(false), 65);
MAC = getMAC(APDU, keyMAC);
if (!Hex.toHexString(response, 4, 8).equals(Hex.toHexString(MAC))) {
throw new RuntimeException("Could not verify chip's MAC."); // *Should* never happen.
throw new AuthAppException("Could not verify chip's MAC.", 448); // Should never happen.
}
return new byte[][]{keyEnc, keyMAC};
}
/**
* Selects a file and reads its contents
*
* @param FID file identifier of the required file
* @param info string for logging
* @return decrypted file contents
*/
private byte[] readFile(byte[] FID, String info) throws NoSuchPaddingException, InvalidKeyException, NoSuchAlgorithmException, IllegalBlockSizeException, BadPaddingException, InvalidAlgorithmParameterException, IOException {
selectFile(FID, info);
byte[] response = getResponse(new byte[0], readFile, "Read binary");
if (response[response.length - 2] != (byte) 0x90 || response[response.length - 1] != 0x00) {
throw new RuntimeException(String.format("Could not read %s", info));
}
return encryptDecryptData(Arrays.copyOfRange(response, 3, 19), Cipher.DECRYPT_MODE);
}
/**
* Encrypts or decrypts the APDU data
*
@ -260,182 +258,74 @@ public class Comms {
byte[] macData = new byte[data.length > 0 ? 48 + length : 48];
macData[15] = ssc; // first block contains the ssc
System.arraycopy(incomplete, 0, macData, 16, 4); // second block has the command
macData[20] = (byte) 0x80; // elements are terminated by 0x80 and zero-padded to the next block
macData[20] = -128; // elements are terminated by 0x80 and zero-padded to the next block
System.arraycopy(incomplete, 5, macData, 32, 3); // third block contains appropriately encapsulated data/Le
if (data.length > 0) { // if the APDU has data, add padding and encrypt it
byte[] paddedData = Arrays.copyOf(data, length);
paddedData[data.length] = (byte) 0x80;
paddedData[data.length] = -128;
encryptedData = encryptDecryptData(paddedData, Cipher.ENCRYPT_MODE);
System.arraycopy(encryptedData, 0, macData, 35, encryptedData.length);
}
macData[35 + encryptedData.length] = (byte) 0x80;
macData[35 + encryptedData.length] = -128;
byte[] MAC = getMAC(macData, keyMAC);
// construct the APDU using the encrypted data and the MAC
byte[] APDU = Arrays.copyOf(incomplete, incomplete.length + encryptedData.length + MAC.length + 3);
byte[] APDU = new byte[incomplete.length + encryptedData.length + MAC.length + 3];
System.arraycopy(incomplete, 0, APDU, 0, incomplete.length);
if (encryptedData.length > 0) {
System.arraycopy(encryptedData, 0, APDU, incomplete.length, encryptedData.length);
}
System.arraycopy(new byte[]{(byte) 0x8E, 0x08}, 0, APDU, incomplete.length + encryptedData.length, 2); // MAC is encapsulated using the tag 0x8E
System.arraycopy(new byte[]{-114, 8}, 0, APDU, incomplete.length + encryptedData.length, 2); // MAC is encapsulated using the tag 0x8E
System.arraycopy(MAC, 0, APDU, incomplete.length + encryptedData.length + 2, MAC.length);
ssc++;
return APDU;
}
/**
* Selects a FILE by its identifier
*
*/
private void selectFile(byte[] FID, String info) throws NoSuchPaddingException, InvalidKeyException, NoSuchAlgorithmException, IllegalBlockSizeException, BadPaddingException, InvalidAlgorithmParameterException, IOException {
byte[] response = getResponse(FID, selectFile, String.format("Select %s", info));
if (response[response.length - 2] != (byte) 0x90 || response[response.length - 1] != 0x00) {
throw new RuntimeException(String.format("Could not select %s", info));
}
}
/**
* Gets the contents of the personal data dedicated file
*
* @param lastBytes the last bytes of the personal data file identifiers (0 < x < 16)
* @return array containing the corresponding data strings
* @param FID the last bytes of file identifiers being requested
* @return array containing the data strings
*
*/
public String[] readPersonalData(byte[] lastBytes) throws NoSuchPaddingException, InvalidKeyException, NoSuchAlgorithmException, IllegalBlockSizeException, BadPaddingException, InvalidAlgorithmParameterException, IOException {
public String[] readPersonalData(byte[] FID) throws NoSuchPaddingException, InvalidKeyException, NoSuchAlgorithmException, IllegalBlockSizeException, BadPaddingException, InvalidAlgorithmParameterException, IOException {
String[] personalData = new String[lastBytes.length];
int stringIndex = 0;
// select the master application
selectFile(IASECCFID, "the master application");
String[] personalData = new String[FID.length];
byte[] data;
byte[] APDU;
byte[] response;
// select the personal data dedicated file
selectFile(personalDF, "the personal data DF");
data = new byte[]{80, 0}; // personal data DF FID
APDU = createSecureAPDU(data, personal);
response = idCard.transceive(APDU);
Log.i("Select personal data DF", Hex.toHexString(response));
byte[] FID = Arrays.copyOf(personalDF, personalDF.length);
// select and read the personal data elementary files
for (byte index : lastBytes) {
// select and read the first 8 elementary files in the DF
for (int i = 0; i < FID.length; i++) {
if (index > 15 || index < 1) throw new RuntimeException("Invalid personal data FID.");
FID[1] = index;
byte index = FID[i];
if (index > 15 || index < 1) throw new AuthAppException("Invalid personal data FID.", 500);
data[1] = index;
APDU = createSecureAPDU(data, personal);
response = idCard.transceive(APDU);
Log.i(String.format("Select EF 500%d", index), Hex.toHexString(response));
APDU = createSecureAPDU(new byte[0], read);
response = idCard.transceive(APDU);
Log.i(String.format("Read binary EF 500%d", index), Hex.toHexString(response));
// store the decrypted datum
byte[] response = readFile(FID, "a personal data EF");
int indexOfTerminator = Hex.toHexString(response).lastIndexOf("80") / 2;
personalData[stringIndex++] = new String(Arrays.copyOfRange(response, 0, indexOfTerminator));
byte[] raw = encryptDecryptData(Arrays.copyOfRange(response, 3, 19), Cipher.DECRYPT_MODE);
int indexOfTerminator = Hex.toHexString(raw).lastIndexOf("80") / 2;
personalData[i] = new String(Arrays.copyOfRange(raw, 0, indexOfTerminator));
}
return personalData;
}
/**
* Attempts to verify the selected PIN
*
* @param PIN user-provided PIN
* @param oneOrTwo true for PIN1, false for PIN2
*/
private void verifyPIN(byte[] PIN, boolean oneOrTwo) throws NoSuchPaddingException, InvalidAlgorithmParameterException, NoSuchAlgorithmException, IllegalBlockSizeException, BadPaddingException, InvalidKeyException, IOException {
selectFile(IASECCFID, "the master application");
if (!oneOrTwo) {
selectFile(QSCD, "the application");
}
// pad the PIN and use the chip for verification
byte[] paddedPIN = Hex.decode("ffffffffffffffffffffffff");
System.arraycopy(PIN, 0, paddedPIN, 0, PIN.length);
byte[] response = getResponse(paddedPIN, oneOrTwo ? verifyPIN1 : verifyPIN2, "PIN verification");
if (response[response.length - 2] != (byte) 0x90 || response[response.length - 1] != 0x00) {
if (response[response.length - 2] == 0x69 && response[response.length - 1] == (byte) 0x83) {
throw new RuntimeException("Invalid PIN. Authentication method blocked.");
} else {
throw new RuntimeException(String.format("Invalid PIN. Attempts left: %d.", response[response.length - 1] + 64));
}
}
}
/**
* Retrieves the authentication or signature certificate from the chip
*
* @param authOrSign true for auth, false for sign cert
* @return the requested certificate
*/
public byte[] getCertificate(boolean authOrSign) throws NoSuchPaddingException, InvalidAlgorithmParameterException, NoSuchAlgorithmException, IllegalBlockSizeException, BadPaddingException, InvalidKeyException, IOException {
selectFile(IASECCFID, "the master application");
selectFile(authOrSign ? AWP : QSCD, "the application");
selectFile(authOrSign ? authCert : signCert, "the certificate");
byte[] certificate = new byte[0];
byte[] readCert = Arrays.copyOf(readFile, readFile.length);
// Construct the certificate byte array n=indexOfTerminator bytes at a time
for (int i = 0; i < 16; i++) {
// Set the P1/P2 values to incrementally read the certificate
readCert[2] = (byte) (certificate.length / 256);
readCert[3] = (byte) (certificate.length % 256);
byte[] response = getResponse(new byte[0], readCert, "Read the certificate");
if (response[response.length - 2] == 0x6b && response[response.length - 1] == 0x00) {
throw new RuntimeException("Wrong read parameters.");
}
// Set the range containing a portion of the certificate and decrypt it
int start = response[2] == 1 ? 3 : 4;
int end = start + (response[start - 2] + 256) % 256 - 1;
byte[] decrypted = encryptDecryptData(Arrays.copyOfRange(response, start, end), Cipher.DECRYPT_MODE);
int indexOfTerminator = Hex.toHexString(decrypted).lastIndexOf("80") / 2;
certificate = Arrays.copyOf(certificate, certificate.length + indexOfTerminator);
System.arraycopy(decrypted, 0, certificate, certificate.length - indexOfTerminator, indexOfTerminator);
if (response[response.length - 2] == (byte) 0x90 && response[response.length - 1] == 0x00) {
break;
}
}
return certificate;
}
/**
* Signs the authentication token hash
*
* @param PIN1 PIN1
* @param token the token hash to be signed
* @return authentication token hash signature
*/
public byte[] authenticate(String PIN1, byte[] token) throws NoSuchPaddingException, InvalidKeyException, NoSuchAlgorithmException, IllegalBlockSizeException, BadPaddingException, InvalidAlgorithmParameterException, IOException {
verifyPIN(PIN1.getBytes(StandardCharsets.UTF_8), true);
selectFile(AWP, "the AWP application");
byte[] response = getResponse(Env, MSESetEnv, "Set environment");
if (response[response.length - 2] != (byte) 0x90 || response[response.length - 1] != 0x00) {
throw new RuntimeException("Setting the environment failed.");
}
InternalAuthenticate[4] = (byte) (0x1d + 16 * (token.length / 16));
InternalAuthenticate[6] = (byte) (0x11 + 16 * (token.length / 16));
response = getResponse(token, InternalAuthenticate, "Internal Authenticate");
if (response[response.length - 2] != (byte) 0x90 || response[response.length - 1] != 0x00) {
throw new RuntimeException("Signing the token failed.");
}
byte[] signature = encryptDecryptData(Arrays.copyOfRange(response, 3, 115), Cipher.DECRYPT_MODE);
int indexOfTerminator = Hex.toHexString(signature).lastIndexOf("80") / 2;
return Arrays.copyOf(signature, indexOfTerminator);
}
private byte[] getResponse(byte[] data, byte[] command, String log) throws NoSuchPaddingException, InvalidKeyException, NoSuchAlgorithmException, IllegalBlockSizeException, BadPaddingException, InvalidAlgorithmParameterException, IOException {
byte[] response = idCard.transceive(createSecureAPDU(data, command));
Log.i(log, Hex.toHexString(response));
return response;
}
}