MOB-42 Fixed JWT generation issue.

MobileAuthApp/app/src/main/java/com/tarkvaraprojekt/mobileauthapp/AuthFragment.kt

@@ -1,6 +1,7 @@
 package com.tarkvaraprojekt.mobileauthapp
 
-import android.content.Intent
+import android.app.Activity
+import android.content.Context
 import android.nfc.NfcAdapter
 import android.nfc.tech.IsoDep
 import android.os.Bundle
@@ -9,16 +10,15 @@ import android.util.Log
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
-import androidx.appcompat.app.AppCompatActivity
 import androidx.fragment.app.Fragment
 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.databinding.FragmentAuthBinding
 import com.tarkvaraprojekt.mobileauthapp.model.SmartCardViewModel
 import java.lang.Exception
+import kotlin.concurrent.thread
 
 /**
  * Fragment that asks the user to detect the ID card with mobile NFC chip.
@@ -31,8 +31,6 @@ class AuthFragment : Fragment() {
 
     private var binding: FragmentAuthBinding? = null
 
-    private val args: CanFragmentArgs by navArgs()
-
     private lateinit var timer: CountDownTimer
 
     private var timeRemaining: Int = 90
@@ -71,7 +69,6 @@ class AuthFragment : Fragment() {
     }
 
     private fun getInfoFromIdCard(adapter: NfcAdapter) {
-        if (args.reading) {
         adapter.enableReaderMode(activity, { tag ->
             timer.cancel()
             requireActivity().runOnUiThread {
@@ -106,31 +103,17 @@ class AuthFragment : Fragment() {
                 }
             }
         }, 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() {
         timer.cancel()
-        if (args.auth) {
-            val action = AuthFragmentDirections.actionAuthFragmentToResultFragment(mobile = args.mobile)
-            findNavController().navigate(action)
-        } else {
         findNavController().navigate(R.id.action_authFragment_to_userFragment)
     }
-    }
 
     private fun goToTheStart() {
         viewModel.clearUserInfo()
         timer.cancel()
-        if (args.reading) {
         findNavController().navigate(R.id.action_authFragment_to_homeFragment)
-        } else {
-            val resultIntent = Intent()
-            requireActivity().setResult(AppCompatActivity.RESULT_CANCELED, resultIntent)
-            requireActivity().finish()
-        }
     }
 
     override fun onDestroy() {

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

@@ -21,6 +21,7 @@ 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;

MobileAuthApp/app/src/main/java/com/tarkvaraprojekt/mobileauthapp/auth/Authenticator.kt

@@ -1,16 +1,12 @@
 package com.tarkvaraprojekt.mobileauthapp.auth
 
-import android.os.Message
 import android.util.Log
 import com.tarkvaraprojekt.mobileauthapp.NFC.Comms
 import io.jsonwebtoken.SignatureAlgorithm
-import org.bouncycastle.util.encoders.Base64
 import java.nio.charset.StandardCharsets
 import java.security.MessageDigest
 import java.time.LocalDateTime
 import java.time.ZoneOffset
-import javax.crypto.Mac
-import kotlin.experimental.and
 
 class Authenticator(val comms : Comms) {
 
@@ -25,37 +21,39 @@ class Authenticator(val comms : Comms) {
         val authenticationCertificate: ByteArray = comms.getCertificate(true);
 
         // Encode the certificate in base64.
-        val base64cert = String(Base64.encode(authenticationCertificate))
+        val base64cert = java.util.Base64.getEncoder().encodeToString(authenticationCertificate)
 
         // Get current epoch time.
         val epoch = LocalDateTime.now(ZoneOffset.UTC).atZone(ZoneOffset.UTC).toEpochSecond()
 
         // Get expiration time.
-        val exp = LocalDateTime.now(ZoneOffset.UTC).plusSeconds(5 * 60L).atZone(ZoneOffset.UTC).toEpochSecond()
+        val exp = LocalDateTime.now(ZoneOffset.UTC).plusSeconds(5 * 60L).atZone(ZoneOffset.UTC)
+            .toEpochSecond()
 
-        // Get subject value.
-        val sub = authenticationCertificate[0] // TODO:
+        // TODO: Get subject value.
+        val sub = "FAMILYNAME.NAME"
 
         // Get header and claims.
-        val header = """{"typ":"$type","alg":"$algorithm","x5c":"$base64cert"}"""
-        val claims = """{"iat":"$epoch","exp":"$exp","aud":"$originUrl","iss":"$iss","sub":"$sub","nonce":"$challenge","cnf":{"tbh":""}}"""
+        val header = """{"typ":"$type","alg":"$algorithm","x5c":["$base64cert"]}"""
+        val claims =
+            """{"iat":"$epoch","exp":"$exp","aud":"$originUrl","iss":"$iss","sub":"$sub","nonce":"$challenge","cnf":{"tbh":""}}"""
 
-        var jwt = String(Base64.encode(header.toByteArray(Charsets.UTF_8))) + "." + String(Base64.encode(claims.toByteArray(Charsets.UTF_8)))
-        jwt = jwt.replace("=", "")
-
-        Log.v("JWT", jwt)
+        val jwt = base64Encode(header.toByteArray(Charsets.UTF_8)) + "." + base64Encode(
+            claims.toByteArray(Charsets.UTF_8)
+        )
 
         // Send the authentication token hash to the ID card for signing and get signed authentication token as response.
-        val encoded = MessageDigest.getInstance("SHA-384").digest(jwt.toByteArray())
+        val encoded =
+            MessageDigest.getInstance("SHA-384").digest(jwt.toByteArray(StandardCharsets.UTF_8))
         val signed = comms.authenticate(pin1, encoded)
 
-        val jws = jwt + "." + String(Base64.encode(signed))
-
-        Log.v("Token", jws)
-
         // Return the signed authentication token.
-        return jws
+        return jwt + "." + base64Encode(signed)
     }
 
+    fun base64Encode(bytes: ByteArray) : String? {
+        val encoded = java.util.Base64.getUrlEncoder().encodeToString(bytes)
+        return encoded.replace("=", "")
+    }
 
 }

demoBackend/src/main/resources/static/js/main.js

@@ -45,7 +45,11 @@ function createParametrizedIntentUrl(challenge, action) {
     if (action == null) {
         console.error("There has to be an action for intent.")
     }
-    return intentUrl + "?" + "action=" + action + (challenge != null ? "&challenge=" + challenge : "");
+    else if (challenge == null) {
+        console.error("Challenge missing, can't authenticate without it.")
+    } else {
+        return intentUrl + "?" + "action=" + action + "&challenge=" + challenge + "&authUrl=" + originUrl + authenticationRequestUrl;
+    }
 }
 
 function isAndroid() {