Android Software Card Emulation

Software Card Emulation on Android

Software CE is not possible yet on stock Android but patches have been made for CyanogenMod and they are integrated in the official release since v10.1.

Resources

Requirements

Android phone with a PN544 NFC chipset

Installation

Easiest is to install cyanogenmod 10.1 (or more recent if available), see instructions

Example

This example is taken from this very interesting post and its source code, adapted for CyanogenMod 10.1 and compiled under Linux in command line.
It's a small example emulating a card able to do a PIN verify then a signature, a bit like some eIDs.

Compile application

Following instructions how to compile Android app in command line

cd virtual-pki-card/se-emulator
JAVA_HOME=/usr/lib/jvm/java-6-sun-1.6.0.26/
ANDROID_HOME=/your_path_to/android-sdk-linux_x86/
PACKAGE=org.nick.se.emulator
PACKAGE_SLASH=${PACKAGE//.//}
DEV_HOME=$(pwd)
TARGET=android-17
mkdir -p $DEV_HOME/obj
mkdir -p $DEV_HOME/bin
mkdir -p $DEV_HOME/lib

Create dummy keystore

$JAVA_HOME/bin/keytool -genkeypair \
                -validity 10000 \
                -dname "CN=company name,
                        OU=organisational unit,
                        O=organisation,
                        L=location,
                        S=state,
                        C=country code" \
                -keystore $DEV_HOME/AndroidTest.keystore \
                -storepass password \
                -keypass password \
                -alias AndroidTestKey \
                -keyalg RSA \
                -v

Create R.java

$ANDROID_HOME/platform-tools/aapt package -v -f -m \
    -S $DEV_HOME/res -J $DEV_HOME/src -M $DEV_HOME/AndroidManifest.xml \
    -I $ANDROID_HOME/platforms/$TARGET/android.jar || exit 1

Compile Java

$JAVA_HOME/bin/javac -verbose -d $DEV_HOME/obj \
    -classpath "$ANDROID_HOME/platforms/$TARGET/android.jar:$DEV_HOME/obj" \
    -sourcepath $DEV_HOME/src \
    $DEV_HOME/src/$PACKAGE_SLASH/*.java || exit 1

Create DEX

$ANDROID_HOME/platform-tools/dx --dex --verbose \
    --output=$DEV_HOME/bin/classes.dex \
    $DEV_HOME/obj $DEV_HOME/lib || exit 1

Create APK

$ANDROID_HOME/platform-tools/aapt package -v -f \
    -S $DEV_HOME/res -M $DEV_HOME/AndroidManifest.xml \
    -I $ANDROID_HOME/platforms/$TARGET/android.jar \
    -F $DEV_HOME/bin/AndroidTest.unsigned.apk \
    $DEV_HOME/bin || exit 1

Sign APK

$JAVA_HOME/bin/jarsigner -verbose \
    -keystore $DEV_HOME/AndroidTest.keystore \
    -storepass password \
    -keypass password \
    -signedjar $DEV_HOME/bin/AndroidTest.signed.apk \
    $DEV_HOME/bin/AndroidTest.unsigned.apk \
    AndroidTestKey || exit 1

Zip-align APK

$ANDROID_HOME/tools/zipalign -v -f 4 \
    $DEV_HOME/bin/AndroidTest.signed.apk \
    $DEV_HOME/bin/AndroidTest.apk || exit 1