core: TelephonyManagerApduInterface: convert to UByte first

Otherwise, the integer representation will be negative when the byte
value is greater than 127.

Android.bp

@@ -1,8 +1,7 @@
 android_app {
     name: "OpenEUICC",
     static_libs: [
-        // Dependencies that must be pulled from maven
-        "asn1bean-prebuilt-jar",
+        // Dependencies that must be pulled from maven,
         "zxing-core-prebuilt-jar",
         "zxing-android-embedded-prebuilt-aar",
 
@@ -14,18 +13,22 @@ android_app {
         "androidx.lifecycle_lifecycle-runtime-ktx",
         "androidx.swiperefreshlayout_swiperefreshlayout",
         "com.google.android.material_material",
-        "gson-prebuilt-jar",
+        "gson",
         "kotlinx_coroutines",
     ],
+    jni_libs: [
+        "liblpac-jni",
+    ],
     srcs: [
         // Main app
         "app/src/main/**/*.kt",
 
-        // TruPhone LPAd library
-        "libs/lpad-sm-dp-plus-connector/src/generated/**/*.java",
-        "libs/lpad-sm-dp-plus-connector/src/main/**/*.java",
-        "libs/lpad-sm-dp-plus-connector/src/main/**/*.kt",
+        // lpac-jni interface
+        "libs/lpac-jni/src/main/**/*.kt",
     ],
+    optimize: {
+        enabled: false,
+    },
     resource_dirs: [
         "app/src/main/res",
     ],

app/src/main/AndroidManifest.xml

@@ -1,7 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
-    tools:ignore="ProtectedPermissions">
+    tools:ignore="ProtectedPermissions"
+    package="im.angry.openeuicc">
 
     <uses-permission android:name="android.permission.MODIFY_PHONE_STATE" />
     <uses-permission android:name="android.permission.READ_PRIVILEGED_PHONE_STATE" />

app/src/main/java/im/angry/openeuicc/core/TelephonyManagerApduInterface.kt

@@ -29,21 +29,24 @@ class TelephonyManagerApduInterface(
         if (channel.status != IccOpenLogicalChannelResponse.STATUS_NO_ERROR || channel.channel == IccOpenLogicalChannelResponse.INVALID_CHANNEL) {
             throw IllegalArgumentException("Cannot open logical channel " + hex + " via TelephonManager on slot " + info.slotId);
         }
-        return channel.channel
+        lastChannel = channel.channel
+        return lastChannel
     }
 
     override fun logicalChannelClose(handle: Int) {
+        check(handle == lastChannel) { "Invalid channel handle " }
         tm.iccCloseLogicalChannelBySlot(info.slotId, handle)
+        lastChannel = -1
     }
 
     override fun transmit(tx: ByteArray): ByteArray {
         check(lastChannel != -1) { "Uninitialized" }
 
-        val cla = tx[0].toInt()
-        val instruction = tx[1].toInt()
-        val p1 = tx[2].toInt()
-        val p2 = tx[3].toInt()
-        val p3 = tx[4].toInt()
+        val cla = tx[0].toUByte().toInt()
+        val instruction = tx[1].toUByte().toInt()
+        val p1 = tx[2].toUByte().toInt()
+        val p2 = tx[3].toUByte().toInt()
+        val p3 = tx[4].toUByte().toInt()
         val p4 = tx.drop(5).toByteArray().encodeHex()
 
         return tm.iccTransmitApduLogicalChannelBySlot(info.slotId, lastChannel,

libs/lpac-jni/src/main/jni/Android.bp

@@ -0,0 +1,52 @@
+cc_defaults {
+    name: "lpac-jni-defaults",
+    local_include_dirs: ["lpac"],
+    sdk_version: "current",
+    cflags: ["-Wno-error"],
+}
+
+cc_library_static {
+    name: "liblpac-cjson",
+    defaults: ["lpac-jni-defaults"],
+    srcs: [
+        "lpac/cjson/*.c",
+    ],
+}
+
+cc_library_static {
+    name: "liblpac-asn1c",
+    defaults: ["lpac-jni-defaults"],
+    local_include_dirs: ["lpac/euicc/asn1c"],
+    cflags: ["-DHAVE_CONFIG_H"],
+    srcs: [
+        "lpac/euicc/asn1c/asn1/*.c",
+    ],
+}
+
+cc_library_static {
+    name: "liblpac-euicc",
+    defaults: ["lpac-jni-defaults"],
+    srcs: [
+        "lpac/euicc/*.c",
+    ],
+    static_libs: [
+        "liblpac-asn1c",
+        "liblpac-cjson",
+    ],
+}
+
+cc_library_shared {
+    name: "liblpac-jni",
+    defaults: ["lpac-jni-defaults"],
+    header_libs: ["jni_headers"],
+    srcs: [
+        "lpac-jni/*.c",
+    ],
+    static_libs: [
+        "liblpac-euicc",
+        "liblpac-asn1c",
+        "liblpac-cjson",
+    ],
+    shared_libs: ["liblog"],
+    system_ext_specific: true,
+}