Initial commit

.gitignore

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+*.iml
+.gradle
+/local.properties
+/.idea/caches
+/.idea/libraries
+/.idea/modules.xml
+/.idea/workspace.xml
+/.idea/navEditor.xml
+/.idea/assetWizardSettings.xml
+.DS_Store
+/build
+/captures
+.externalNativeBuild
+.cxx
+local.properties

app/.gitignore

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+/build

app/build.gradle

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+plugins {
+    id 'com.android.application'
+}
+
+android {
+    namespace 'de.androidcrypto.talktoyourcreditcard'
+    compileSdk 33
+
+    defaultConfig {
+        applicationId "de.androidcrypto.talktoyourcreditcard"
+        minSdk 21
+        targetSdk 33
+        versionCode 1
+        versionName "1.0"
+
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+}
+
+dependencies {
+
+    implementation 'androidx.appcompat:appcompat:1.6.1'
+    implementation 'com.google.android.material:material:1.8.0'
+    implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
+    testImplementation 'junit:junit:4.13.2'
+    androidTestImplementation 'androidx.test.ext:junit:1.1.5'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.5.1'
+
+    // parsing BER-TLV encoded data, e.g. a credit card
+    // source: https://github.com/evsinev/ber-tlv
+    implementation 'com.payneteasy:ber-tlv:1.0-11'
+
+    // pretty printing of card's responses
+    // source: https://github.com/devnied/EMV-NFC-Paycard-Enrollment
+    implementation 'com.github.devnied.emvnfccard:library:3.0.1'
+}

app/proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

app/src/androidTest/java/de/androidcrypto/talktoyourcreditcard/ExampleInstrumentedTest.java

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+package de.androidcrypto.talktoyourcreditcard;
+
+import android.content.Context;
+
+import androidx.test.platform.app.InstrumentationRegistry;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import static org.junit.Assert.*;
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+@RunWith(AndroidJUnit4.class)
+public class ExampleInstrumentedTest {
+    @Test
+    public void useAppContext() {
+        // Context of the app under test.
+        Context appContext = InstrumentationRegistry.getInstrumentation().getTargetContext();
+        assertEquals("de.androidcrypto.talktoyourcreditcard", appContext.getPackageName());
+    }
+}

app/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools">
+
+    <!-- needed for NFC -->
+    <uses-permission android:name="android.permission.NFC" />
+    <uses-permission android:name="android.permission.VIBRATE" />
+
+    <application
+        android:allowBackup="true"
+        android:dataExtractionRules="@xml/data_extraction_rules"
+        android:fullBackupContent="@xml/backup_rules"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.TalkToYourCreditCard"
+        tools:targetApi="31">
+        <activity
+            android:name=".MainActivity"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

app/src/main/java/de/androidcrypto/talktoyourcreditcard/DOL.java

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+package de.androidcrypto.talktoyourcreditcard;
+
+/*
+ * Copyright 2010 sasc
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import com.github.devnied.emvnfccard.iso7816emv.TagAndLength;
+import com.github.devnied.emvnfccard.utils.TlvUtil;
+
+import java.io.PrintWriter;
+import java.io.StringWriter;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+
+/**
+ * Data Object List (DOL)
+ *
+ * In several instances, the terminal is asked to build a flexible list of data
+ * elements to be passed to the card under the card‘s direction.
+ * To minimise processing within the ICC, such a list is not TLV encoded but
+ * is a single constructed field built by concatenating several data
+ * elements together. Since the elements of the constructed field are not
+ * TLV encoded, it is imperative that the ICC knows the format of this field
+ * when the data is received. This is achieved by including a
+ * Data Object List (DOL) in the ICC, specifying the format of the data to
+ * be included in the constructed field.
+ *
+ * DOLs currently used in this specification include:
+ * - the Processing Options Data Object List (PDOL) used with the GET PROCESSING OPTIONS command
+ * - the Card Risk Management Data Object Lists (CDOL1 and CDOL2) used with the GENERATE APPLICATION CRYPTOGRAM (AC) command
+ * - the Transaction Certificate Data Object List (TDOL) used to generate a TC Hash Value
+ * - the Dynamic Data Authentication Data Object List (DDOL) used with the INTERNAL AUTHENTICATE command
+ *
+ * ---------------------------------------------------------------------------
+ *
+ * In other words, a DOL is sent from the ICC. This DOL contains only Tag ID bytes and length bytes.
+ * The Terminal constructs the response, which contains only the VALUES for these tags.
+ *
+ * //TODO check DOL processing on page 55
+ *
+ * @author sasc
+ *
+ * Source: https://github.com/sasc999/javaemvreader/blob/master/src/main/java/sasc/emv/DOL.java
+ */
+public class DOL {
+
+    public enum Type{
+        PDOL("Processing Options Data Object List"),
+        CDOL1("Card Risk Management Data Object List 1"),
+        CDOL2("Card Risk Management Data Object List 2"),
+        TDOL("Transaction Certificate Data Object List"),
+        //An ICC that supports DDA shall contain a DDOL. The DDOL shall contain only the Unpredictable Number generated by the terminal (tag '9F37', 4 bytes binary).
+        DDOL("Dynamic Data Authentication Data Object List");
+
+        private String description;
+
+        private Type(String description){
+            this.description = description;
+        }
+
+        public String getDescription(){
+            return description;
+        }
+
+        @Override
+        public String toString(){
+            return getDescription();
+        }
+    }
+
+    private Type type;
+    private List<TagAndLength> tagAndLengthList = new ArrayList<TagAndLength>();
+
+    public DOL(Type type, byte[] data){
+        //Parse tags and lengths
+        this.type = type;
+        this.tagAndLengthList = TlvUtil.parseTagAndLength(data);
+    }
+
+    public List<TagAndLength> getTagAndLengthList(){
+        return Collections.unmodifiableList(tagAndLengthList);
+    }
+
+    @Override
+    public String toString(){
+        StringWriter sw = new StringWriter();
+        dump(new PrintWriter(sw), 0);
+        return sw.toString();
+    }
+
+
+    public void dump(PrintWriter pw, int indent){
+        pw.println(getSpaces(indent)+type.getDescription());
+        final int INDENT_SIZE = 2;
+        String indentStr = getSpaces(indent+INDENT_SIZE);
+        //String indentStr = Util.getSpaces(indent+Log.INDENT_SIZE);
+
+        for(TagAndLength tagAndLength : tagAndLengthList){
+            int length = tagAndLength.getLength();
+            pw.println(indentStr+tagAndLength.getTag().getName() + " ("+length+ " "+(length==1?"byte":"bytes")+")");
+        }
+    }
+
+    public static String getSpaces(int length) {
+        StringBuilder buf = new StringBuilder(length);
+        for (int i = 0; i < length; i++) {
+            buf.append(" ");
+        }
+        return buf.toString();
+    }
+
+}

app/src/main/java/de/androidcrypto/talktoyourcreditcard/DolTag.java

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+package de.androidcrypto.talktoyourcreditcard;
+
+public class DolTag {
+
+    private byte[] tag;
+    private String tagName;
+    private byte[] defaultValue;
+
+    public DolTag(byte[] tag, String tagName, byte[] defaultValue) {
+        this.tag = tag;
+        this.tagName = tagName;
+        this.defaultValue = defaultValue;
+    }
+
+    public byte[] getTag() {
+        return tag;
+    }
+
+    public void setTag(byte[] tag) {
+        this.tag = tag;
+    }
+
+    public String getTagName() {
+        return tagName;
+    }
+
+    public void setTagName(String tagName) {
+        this.tagName = tagName;
+    }
+
+    public byte[] getDefaultValue() {
+        return defaultValue;
+    }
+
+    public void setDefaultValue(byte[] defaultValue) {
+        this.defaultValue = defaultValue;
+    }
+}