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/kotlin/ranges/CharRange.java

@@ -0,0 +1,102 @@
+package kotlin.ranges;
+
+import kotlin.Deprecated;
+import kotlin.ExperimentalStdlibApi;
+import kotlin.Metadata;
+import kotlin.SinceKotlin;
+import kotlin.WasExperimental;
+import kotlin.jvm.internal.DefaultConstructorMarker;
+import kotlin.jvm.internal.Intrinsics;
+
+@Metadata(d1 = {"\u00006\n\u0002\u0018\u0002\n\u0002\u0018\u0002\n\u0002\u0018\u0002\n\u0002\u0010\f\n\u0002\u0018\u0002\n\u0002\b\u000b\n\u0002\u0010\u000b\n\u0002\b\u0003\n\u0002\u0010\u0000\n\u0000\n\u0002\u0010\b\n\u0002\b\u0002\n\u0002\u0010\u000e\n\u0002\b\u0002\u0018\u0000 \u001a2\u00020\u00012\b\u0012\u0004\u0012\u00020\u00030\u00022\b\u0012\u0004\u0012\u00020\u00030\u0004:\u0001\u001aB\u0015\u0012\u0006\u0010\u0005\u001a\u00020\u0003\u0012\u0006\u0010\u0006\u001a\u00020\u0003¢\u0006\u0002\u0010\u0007J\u0011\u0010\u000f\u001a\u00020\u00102\u0006\u0010\u0011\u001a\u00020\u0003H\u0096\u0002J\u0013\u0010\u0012\u001a\u00020\u00102\b\u0010\u0013\u001a\u0004\u0018\u00010\u0014H\u0096\u0002J\b\u0010\u0015\u001a\u00020\u0016H\u0016J\b\u0010\u0017\u001a\u00020\u0010H\u0016J\b\u0010\u0018\u001a\u00020\u0019H\u0016R\u001a\u0010\b\u001a\u00020\u00038VX\u0097\u0004¢\u0006\f\u0012\u0004\b\t\u0010\n\u001a\u0004\b\u000b\u0010\fR\u0014\u0010\u0006\u001a\u00020\u00038VX\u0096\u0004¢\u0006\u0006\u001a\u0004\b\r\u0010\fR\u0014\u0010\u0005\u001a\u00020\u00038VX\u0096\u0004¢\u0006\u0006\u001a\u0004\b\u000e\u0010\f¨\u0006\u001b"}, d2 = {"Lkotlin/ranges/CharRange;", "Lkotlin/ranges/CharProgression;", "Lkotlin/ranges/ClosedRange;", "", "Lkotlin/ranges/OpenEndRange;", "start", "endInclusive", "(CC)V", "endExclusive", "getEndExclusive$annotations", "()V", "getEndExclusive", "()Ljava/lang/Character;", "getEndInclusive", "getStart", "contains", "", "value", "equals", "other", "", "hashCode", "", "isEmpty", "toString", "", "Companion", "kotlin-stdlib"}, k = 1, mv = {1, 9, 0}, xi = 48)
+/* loaded from: classes3.dex */
+public final class CharRange extends CharProgression implements ClosedRange<Character>, OpenEndRange<Character> {
+
+    /* renamed from: Companion, reason: from kotlin metadata */
+    public static final Companion INSTANCE = new Companion(null);
+    private static final CharRange EMPTY = new CharRange(1, 0);
+
+    @Metadata(d1 = {"\u0000\u0014\n\u0002\u0018\u0002\n\u0002\u0010\u0000\n\u0002\b\u0002\n\u0002\u0018\u0002\n\u0002\b\u0003\b\u0086\u0003\u0018\u00002\u00020\u0001B\u0007\b\u0002¢\u0006\u0002\u0010\u0002R\u0011\u0010\u0003\u001a\u00020\u0004¢\u0006\b\n\u0000\u001a\u0004\b\u0005\u0010\u0006¨\u0006\u0007"}, d2 = {"Lkotlin/ranges/CharRange$Companion;", "", "()V", "EMPTY", "Lkotlin/ranges/CharRange;", "getEMPTY", "()Lkotlin/ranges/CharRange;", "kotlin-stdlib"}, k = 1, mv = {1, 9, 0}, xi = 48)
+    /* loaded from: classes3.dex */
+    public static final class Companion {
+        public /* synthetic */ Companion(DefaultConstructorMarker defaultConstructorMarker) {
+            this();
+        }
+
+        public final CharRange getEMPTY() {
+            return CharRange.EMPTY;
+        }
+
+        private Companion() {
+        }
+    }
+
+    public CharRange(char c4, char c5) {
+        super(c4, c5, 1);
+    }
+
+    @Deprecated(message = "Can throw an exception when it's impossible to represent the value with Char type, for example, when the range includes MAX_VALUE. It's recommended to use 'endInclusive' property that doesn't throw.")
+    @SinceKotlin(version = "1.9")
+    @WasExperimental(markerClass = {ExperimentalStdlibApi.class})
+    public static /* synthetic */ void getEndExclusive$annotations() {
+    }
+
+    @Override // kotlin.ranges.ClosedRange, kotlin.ranges.OpenEndRange
+    public /* bridge */ /* synthetic */ boolean contains(Comparable comparable) {
+        return contains(((Character) comparable).charValue());
+    }
+
+    @Override // kotlin.ranges.CharProgression
+    public boolean equals(Object other) {
+        if (!(other instanceof CharRange)) {
+            return false;
+        }
+        if (isEmpty() && ((CharRange) other).isEmpty()) {
+            return true;
+        }
+        CharRange charRange = (CharRange) other;
+        return getFirst() == charRange.getFirst() && getLast() == charRange.getLast();
+    }
+
+    @Override // kotlin.ranges.CharProgression
+    public int hashCode() {
+        if (isEmpty()) {
+            return -1;
+        }
+        return getLast() + (getFirst() * 31);
+    }
+
+    @Override // kotlin.ranges.CharProgression, kotlin.ranges.ClosedRange, kotlin.ranges.OpenEndRange
+    public boolean isEmpty() {
+        return Intrinsics.compare((int) getFirst(), (int) getLast()) > 0;
+    }
+
+    @Override // kotlin.ranges.CharProgression
+    public String toString() {
+        return getFirst() + ".." + getLast();
+    }
+
+    public boolean contains(char value) {
+        return Intrinsics.compare((int) getFirst(), (int) value) <= 0 && Intrinsics.compare((int) value, (int) getLast()) <= 0;
+    }
+
+    /* JADX WARN: Can't rename method to resolve collision */
+    @Override // kotlin.ranges.OpenEndRange
+    public Character getEndExclusive() {
+        if (getLast() != 65535) {
+            return Character.valueOf((char) (getLast() + 1));
+        }
+        throw new IllegalStateException("Cannot return the exclusive upper bound of a range that includes MAX_VALUE.");
+    }
+
+    /* JADX WARN: Can't rename method to resolve collision */
+    @Override // kotlin.ranges.ClosedRange
+    public Character getEndInclusive() {
+        return Character.valueOf(getLast());
+    }
+
+    @Override // kotlin.ranges.ClosedRange, kotlin.ranges.OpenEndRange
+    public Character getStart() {
+        return Character.valueOf(getFirst());
+    }
+}