Primer paso de la investigacion. Se aportan el .apk, las carpetas con el apk extraido y el apk descompilado. El archivo API_DOCUMENTATION.md es un archivo donde se anotaran los descubrimientos del funcionamiento de la API, y los .py son scripts para probar la funcionalidad de la API con los métodos que vayamos encontrando. Finalmente, los archivos .js son scripts de Frida para extraer informacion de la APP durante la ejecucion.

apk_decompiled/sources/com/google/firebase/crashlytics/ktx/FirebaseCrashlyticsKt.java

@@ -0,0 +1,28 @@
+package com.google.firebase.crashlytics.ktx;
+
+import com.google.firebase.crashlytics.FirebaseCrashlytics;
+import com.google.firebase.ktx.Firebase;
+import kotlin.Deprecated;
+import kotlin.Metadata;
+import kotlin.ReplaceWith;
+import kotlin.Unit;
+import kotlin.jvm.functions.Function1;
+import kotlin.jvm.internal.Intrinsics;
+
+@Metadata(d1 = {"\u0000\"\n\u0000\n\u0002\u0018\u0002\n\u0002\u0018\u0002\n\u0002\b\u0003\n\u0002\u0010\u0002\n\u0000\n\u0002\u0018\u0002\n\u0002\u0018\u0002\n\u0002\u0018\u0002\n\u0000\u001a%\u0010\u0005\u001a\u00020\u0006*\u00020\u00012\u0017\u0010\u0007\u001a\u0013\u0012\u0004\u0012\u00020\t\u0012\u0004\u0012\u00020\u00060\b¢\u0006\u0002\b\nH\u0007\"\u0015\u0010\u0000\u001a\u00020\u0001*\u00020\u00028F¢\u0006\u0006\u001a\u0004\b\u0003\u0010\u0004¨\u0006\u000b"}, d2 = {"crashlytics", "Lcom/google/firebase/crashlytics/FirebaseCrashlytics;", "Lcom/google/firebase/ktx/Firebase;", "getCrashlytics", "(Lcom/google/firebase/ktx/Firebase;)Lcom/google/firebase/crashlytics/FirebaseCrashlytics;", "setCustomKeys", "", "init", "Lkotlin/Function1;", "Lcom/google/firebase/crashlytics/ktx/KeyValueBuilder;", "Lkotlin/ExtensionFunctionType;", "com.google.firebase-firebase-crashlytics"}, k = 2, mv = {1, 7, 1}, xi = 48)
+/* loaded from: classes3.dex */
+public final class FirebaseCrashlyticsKt {
+    public static final FirebaseCrashlytics getCrashlytics(Firebase firebase) {
+        Intrinsics.checkNotNullParameter(firebase, "<this>");
+        FirebaseCrashlytics firebaseCrashlytics = FirebaseCrashlytics.getInstance();
+        Intrinsics.checkNotNullExpressionValue(firebaseCrashlytics, "getInstance()");
+        return firebaseCrashlytics;
+    }
+
+    @Deprecated(message = "Migrate to use the KTX API from the main module: https://firebase.google.com/docs/android/kotlin-migration.", replaceWith = @ReplaceWith(expression = "", imports = {}))
+    public static final void setCustomKeys(FirebaseCrashlytics firebaseCrashlytics, Function1<? super KeyValueBuilder, Unit> init) {
+        Intrinsics.checkNotNullParameter(firebaseCrashlytics, "<this>");
+        Intrinsics.checkNotNullParameter(init, "init");
+        init.invoke(new KeyValueBuilder(firebaseCrashlytics));
+    }
+}

apk_decompiled/sources/com/google/firebase/crashlytics/ktx/FirebaseCrashlyticsKtxRegistrar.java

@@ -0,0 +1,21 @@
+package com.google.firebase.crashlytics.ktx;
+
+import androidx.annotation.Keep;
+import com.google.firebase.components.Component;
+import com.google.firebase.components.ComponentRegistrar;
+import java.util.List;
+import kotlin.Deprecated;
+import kotlin.Metadata;
+import kotlin.ReplaceWith;
+import kotlin.collections.CollectionsKt;
+
+@Deprecated(message = "Migrate to use the KTX API from the main module: https://firebase.google.com/docs/android/kotlin-migration.", replaceWith = @ReplaceWith(expression = "", imports = {}))
+@Keep
+@Metadata(d1 = {"\u0000\u0018\n\u0002\u0018\u0002\n\u0002\u0018\u0002\n\u0002\b\u0002\n\u0002\u0010 \n\u0002\u0018\u0002\n\u0002\b\u0002\b\u0001\u0018\u0000 \u00062\u00020\u0001:\u0001\u0006B\u0005¢\u0006\u0002\u0010\u0002J\u0012\u0010\u0003\u001a\f\u0012\b\u0012\u0006\u0012\u0002\b\u00030\u00050\u0004H\u0016¨\u0006\u0007"}, d2 = {"Lcom/google/firebase/crashlytics/ktx/FirebaseCrashlyticsKtxRegistrar;", "Lcom/google/firebase/components/ComponentRegistrar;", "()V", "getComponents", "", "Lcom/google/firebase/components/Component;", "Companion", "com.google.firebase-firebase-crashlytics"}, k = 1, mv = {1, 7, 1}, xi = 48)
+/* loaded from: classes3.dex */
+public final class FirebaseCrashlyticsKtxRegistrar implements ComponentRegistrar {
+    @Override // com.google.firebase.components.ComponentRegistrar
+    public List<Component<?>> getComponents() {
+        return CollectionsKt.emptyList();
+    }
+}

apk_decompiled/sources/com/google/firebase/crashlytics/ktx/KeyValueBuilder.java

@@ -0,0 +1,56 @@
+package com.google.firebase.crashlytics.ktx;
+
+import com.google.firebase.crashlytics.FirebaseCrashlytics;
+import kotlin.Deprecated;
+import kotlin.Metadata;
+import kotlin.ReplaceWith;
+import kotlin.jvm.internal.Intrinsics;
+
+@Deprecated(message = "Use `com.google.firebase.crashlytics.KeyValueBuilder` from the main module.")
+@Metadata(d1 = {"\u00002\n\u0002\u0018\u0002\n\u0002\u0010\u0000\n\u0000\n\u0002\u0018\u0002\n\u0002\b\u0002\n\u0002\u0010\u0002\n\u0002\u0010\u000e\n\u0000\n\u0002\u0010\u000b\n\u0002\u0010\u0006\n\u0002\u0010\u0007\n\u0002\u0010\b\n\u0002\u0010\t\n\u0000\b\u0007\u0018\u00002\u00020\u0001B\r\u0012\u0006\u0010\u0002\u001a\u00020\u0003¢\u0006\u0002\u0010\u0004J\u0018\u0010\u0005\u001a\u00020\u00062\u0006\u0010\u0005\u001a\u00020\u00072\u0006\u0010\b\u001a\u00020\tH\u0007J\u0018\u0010\u0005\u001a\u00020\u00062\u0006\u0010\u0005\u001a\u00020\u00072\u0006\u0010\b\u001a\u00020\nH\u0007J\u0018\u0010\u0005\u001a\u00020\u00062\u0006\u0010\u0005\u001a\u00020\u00072\u0006\u0010\b\u001a\u00020\u000bH\u0007J\u0018\u0010\u0005\u001a\u00020\u00062\u0006\u0010\u0005\u001a\u00020\u00072\u0006\u0010\b\u001a\u00020\fH\u0007J\u0018\u0010\u0005\u001a\u00020\u00062\u0006\u0010\u0005\u001a\u00020\u00072\u0006\u0010\b\u001a\u00020\rH\u0007J\u0018\u0010\u0005\u001a\u00020\u00062\u0006\u0010\u0005\u001a\u00020\u00072\u0006\u0010\b\u001a\u00020\u0007H\u0007R\u000e\u0010\u0002\u001a\u00020\u0003X\u0082\u0004¢\u0006\u0002\n\u0000¨\u0006\u000e"}, d2 = {"Lcom/google/firebase/crashlytics/ktx/KeyValueBuilder;", "", "crashlytics", "Lcom/google/firebase/crashlytics/FirebaseCrashlytics;", "(Lcom/google/firebase/crashlytics/FirebaseCrashlytics;)V", "key", "", "", "value", "", "", "", "", "", "com.google.firebase-firebase-crashlytics"}, k = 1, mv = {1, 7, 1}, xi = 48)
+/* loaded from: classes3.dex */
+public final class KeyValueBuilder {
+    private final FirebaseCrashlytics crashlytics;
+
+    public KeyValueBuilder(FirebaseCrashlytics crashlytics) {
+        Intrinsics.checkNotNullParameter(crashlytics, "crashlytics");
+        this.crashlytics = crashlytics;
+    }
+
+    @Deprecated(message = "Use `com.google.firebase.crashlytics.KeyValueBuilder.key(key, value)` from the main module.", replaceWith = @ReplaceWith(expression = "", imports = {}))
+    public final void key(String key, boolean value) {
+        Intrinsics.checkNotNullParameter(key, "key");
+        this.crashlytics.setCustomKey(key, value);
+    }
+
+    @Deprecated(message = "Use `com.google.firebase.crashlytics.KeyValueBuilder.key(key, value)` from the main module.", replaceWith = @ReplaceWith(expression = "", imports = {}))
+    public final void key(String key, double value) {
+        Intrinsics.checkNotNullParameter(key, "key");
+        this.crashlytics.setCustomKey(key, value);
+    }
+
+    @Deprecated(message = "Use `com.google.firebase.crashlytics.KeyValueBuilder.key(key, value)` from the main module.", replaceWith = @ReplaceWith(expression = "", imports = {}))
+    public final void key(String key, float value) {
+        Intrinsics.checkNotNullParameter(key, "key");
+        this.crashlytics.setCustomKey(key, value);
+    }
+
+    @Deprecated(message = "Use `com.google.firebase.crashlytics.KeyValueBuilder.key(key, value)` from the main module.", replaceWith = @ReplaceWith(expression = "", imports = {}))
+    public final void key(String key, int value) {
+        Intrinsics.checkNotNullParameter(key, "key");
+        this.crashlytics.setCustomKey(key, value);
+    }
+
+    @Deprecated(message = "Use `com.google.firebase.crashlytics.KeyValueBuilder.key(key, value)` from the main module.", replaceWith = @ReplaceWith(expression = "", imports = {}))
+    public final void key(String key, long value) {
+        Intrinsics.checkNotNullParameter(key, "key");
+        this.crashlytics.setCustomKey(key, value);
+    }
+
+    @Deprecated(message = "Use `com.google.firebase.crashlytics.KeyValueBuilder.key(key, value)` from the main module.", replaceWith = @ReplaceWith(expression = "", imports = {}))
+    public final void key(String key, String value) {
+        Intrinsics.checkNotNullParameter(key, "key");
+        Intrinsics.checkNotNullParameter(value, "value");
+        this.crashlytics.setCustomKey(key, value);
+    }
+}