commit 195897bf2bfaa14440e252b15e00ca2a090d253c
parent 422167c8fbda055bce8abcd81a8e7442052f467d
Author: Matyja Lukas Adam <lukas.matyja@students.bfh.ch>
Date: Tue, 11 Jun 2024 23:17:40 +0200
some changes
Diffstat:
6 files changed, 143 insertions(+), 2 deletions(-)
diff --git a/verification-app/app/build.gradle b/verification-app/app/build.gradle
@@ -30,6 +30,23 @@ android {
buildFeatures {
viewBinding true
}
+ packagingOptions {
+ // Exclude specific files or directories that might cause conflicts
+ exclude 'META-INF/DEPENDENCIES'
+ exclude 'META-INF/LICENSE'
+ exclude 'META-INF/LICENSE.txt'
+ exclude 'META-INF/NOTICE'
+ exclude 'META-INF/NOTICE.txt'
+ exclude 'META-INF/ASL2.0'
+ exclude 'META-INF/*.kotlin_module'
+
+ // Merge specific files if needed
+ merge 'META-INF/LGPL2.1'
+ merge 'META-INF/AL2.0'
+
+ // Exclude everything under META-INF to avoid conflicts
+ resources.excludes.add("META-INF/**/*")
+ }
}
@@ -44,6 +61,8 @@ dependencies {
implementation 'androidx.navigation:navigation-fragment:2.7.5'
implementation 'androidx.navigation:navigation-ui:2.7.5'
implementation 'com.github.yuriy-budiyev:code-scanner:2.3.2'
+ // https://mvnrepository.com/artifact/org.bouncycastle/bcpkix-jdk18on
+ implementation group: 'org.bouncycastle', name: 'bcpkix-jdk18on', version: '1.78.1'
testImplementation 'junit:junit:4.13.2'
androidTestImplementation 'androidx.test.ext:junit:1.1.5'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.5.1'
diff --git a/verification-app/app/src/main/AndroidManifest.xml b/verification-app/app/src/main/AndroidManifest.xml
@@ -2,7 +2,8 @@
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools">
- <uses-permission android:name="android.permission.CAMERA" />
+ <uses-permission android:name="android.permission.CAMERA"
+ android:required="true"/>
<uses-feature
android:name="android.hardware.camera"
diff --git a/verification-app/app/src/main/java/taler/donau/verification/Results.java b/verification-app/app/src/main/java/taler/donau/verification/Results.java
@@ -2,20 +2,137 @@ package taler.donau.verification;
import android.content.Intent;
import android.os.Bundle;
+import android.view.View;
import android.widget.TextView;
import androidx.appcompat.app.AppCompatActivity;
+import java.nio.charset.StandardCharsets;
+import java.util.Base64;
+
+import org.bouncycastle.crypto.Signer;
+import org.bouncycastle.crypto.params.AsymmetricKeyParameter;
+import org.bouncycastle.crypto.signers.Ed25519Signer;
+import org.bouncycastle.crypto.util.OpenSSHPublicKeyUtil;
+
public class Results extends AppCompatActivity {
+ // QR-string: YEAR:AMOUNT:FRACTION:TAXID:TAXIDSALT:EDD25519SIGNATURE:PUBLICKEY
+ // Base64 encoded: SALT,TAXID,SIGNATURE, PUBLICKEY (public key only temporary for testing)
+
+ private final int NUMBER_OF_ARGUMENTS = 7;
+ // hard coded (only temporary for testing)
+ private final int SIGNATURECODE = 1500;
+ // uint64_t
+ private Long amount;
+ // uint32_t
+ private int fraction;
+ // uint64_t
+ private long year;
+ private byte[] taxid;
+ private byte[] salt;
+ private byte[] eddsaSignature;
+ private byte[] publicKey;
+ TextView textView;
+
+ public enum SignatureStatus {
+ INVALID_NUMBER_OF_ARGUMENTS,
+ MALFORMED_ARGUMENT,
+ SIGNATURE_INVALID,
+ SIGNATURE_VALID;
+ }
+
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_results);
- TextView textView = findViewById(R.id.textView);
+ textView = findViewById(R.id.textView);
Intent intent = getIntent();
textView.setText(intent.getStringExtra("QR-String"));
+ String[] parts = intent.getStringExtra("QR-String").split("/");
+ if (parts == null || parts.length != NUMBER_OF_ARGUMENTS) {
+ statusHandling(SignatureStatus.INVALID_NUMBER_OF_ARGUMENTS);
+ return;
+ }
+
+ try {
+ year = Long.parseUnsignedLong(parts[0]);
+ amount = Long.parseUnsignedLong(parts[1]);
+ fraction = Integer.parseInt(parts[2]);
+ taxid = Base64.getDecoder().decode(parts[3]);
+ salt = Base64.getDecoder().decode(parts[4]);
+ eddsaSignature = Base64.getDecoder().decode(parts[5]);
+ publicKey = Base64.getDecoder().decode(parts[6]);
+ } catch (Exception e) {
+ statusHandling(SignatureStatus.MALFORMED_ARGUMENT);
+ return;
+ }
+
+ checkSignature();
+
+ }
+
+ private void checkSignature() {
+ AsymmetricKeyParameter publicKeyParameters = OpenSSHPublicKeyUtil.parsePublicKey(publicKey);
+ Signer verifier = new Ed25519Signer();
+ verifier.init(false, publicKeyParameters);
+ byte[] yearBytes = parseLongToBytes(year);
+ // TODO: hash the salted tax id to a byte array
+ // TODO: translate the amount to TALER AMOUNT NBO
+ // use ByteBuffer.order(ByteOrder.BIG_ENDIAN) to change byteorder
+
+ byte[] message = yearBytes; // .....
+ verifier.update(message, 0, message.length);
+ if (verifier.verifySignature(eddsaSignature)) {
+ statusHandling(SignatureStatus.SIGNATURE_VALID);
+ } else {
+ statusHandling(SignatureStatus.SIGNATURE_INVALID);
+ }
+
+ }
+
+ // TODO: move strings to res/values/strings
+ private void statusHandling(SignatureStatus es) {
+ View rootView = findViewById(R.id.root_view);
+ switch (es) {
+ case INVALID_NUMBER_OF_ARGUMENTS:
+ textView.setText("Invalid number of arguments!");
+ rootView.setBackgroundResource(R.color.red);
+ break;
+ case MALFORMED_ARGUMENT:
+ textView.setText("Malformed argument!");
+ rootView.setBackgroundResource(R.color.red);
+ break;
+ case SIGNATURE_INVALID:
+ textView.setText("Donation Statment signature is invalid!");
+ rootView.setBackgroundResource(R.color.red);
+ break;
+ case SIGNATURE_VALID:
+ textView.setText("Donation Statment signature is valid!");
+ rootView.setBackgroundResource(R.color.green);
+ break;
+ }
+ }
+
+ private byte[] parseIntToBytes(int intValue) {
+ return new byte[] {
+ (byte)(intValue >> 24),
+ (byte)(intValue >> 16),
+ (byte)(intValue >> 8),
+ (byte)intValue};
+ }
+
+ private byte[] parseLongToBytes(Long longValue) {
+ return new byte[] {
+ (byte)(longValue >> 56),
+ (byte)(longValue >> 48),
+ (byte)(longValue >> 40),
+ (byte)(longValue >> 32),
+ (byte)(longValue >> 24),
+ (byte)(longValue >> 16),
+ (byte)(longValue >> 8),
+ (byte) (longValue >> 0)};
}
}
\ No newline at end of file
diff --git a/verification-app/app/src/main/res/layout/fragment_results.xml b/verification-app/app/src/main/res/layout/fragment_results.xml
@@ -1,4 +1,5 @@
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+ android:id="@+id/root_view"
android:layout_width="match_parent"
android:layout_height="match_parent">
diff --git a/verification-app/app/src/main/res/values/colors.xml b/verification-app/app/src/main/res/values/colors.xml
@@ -7,4 +7,6 @@
<color name="teal_700">#FF018786</color>
<color name="black">#FF000000</color>
<color name="white">#FFFFFFFF</color>
+ <color name="red">#870C0C</color>
+ <color name="green">#045F06</color>
</resources>
\ No newline at end of file
diff --git a/verification-app/settings.gradle b/verification-app/settings.gradle
@@ -13,5 +13,6 @@ dependencyResolutionManagement {
maven { url 'https://jitpack.io' }
}
}
+
rootProject.name = "Donau-Verification"
include ':app'
