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/IntProgression.java

@@ -0,0 +1,106 @@
+package kotlin.ranges;
+
+import java.util.Iterator;
+import kotlin.Metadata;
+import kotlin.internal.ProgressionUtilKt;
+import kotlin.jvm.internal.DefaultConstructorMarker;
+import kotlin.jvm.internal.markers.KMappedMarker;
+
+@Metadata(d1 = {"\u0000,\n\u0002\u0018\u0002\n\u0002\u0010\u001c\n\u0002\u0010\b\n\u0002\b\u000b\n\u0002\u0010\u000b\n\u0000\n\u0002\u0010\u0000\n\u0002\b\u0003\n\u0002\u0018\u0002\n\u0000\n\u0002\u0010\u000e\n\u0002\b\u0002\b\u0016\u0018\u0000 \u00172\b\u0012\u0004\u0012\u00020\u00020\u0001:\u0001\u0017B\u001f\b\u0000\u0012\u0006\u0010\u0003\u001a\u00020\u0002\u0012\u0006\u0010\u0004\u001a\u00020\u0002\u0012\u0006\u0010\u0005\u001a\u00020\u0002¢\u0006\u0002\u0010\u0006J\u0013\u0010\r\u001a\u00020\u000e2\b\u0010\u000f\u001a\u0004\u0018\u00010\u0010H\u0096\u0002J\b\u0010\u0011\u001a\u00020\u0002H\u0016J\b\u0010\u0012\u001a\u00020\u000eH\u0016J\t\u0010\u0013\u001a\u00020\u0014H\u0096\u0002J\b\u0010\u0015\u001a\u00020\u0016H\u0016R\u0011\u0010\u0007\u001a\u00020\u0002¢\u0006\b\n\u0000\u001a\u0004\b\b\u0010\tR\u0011\u0010\n\u001a\u00020\u0002¢\u0006\b\n\u0000\u001a\u0004\b\u000b\u0010\tR\u0011\u0010\u0005\u001a\u00020\u0002¢\u0006\b\n\u0000\u001a\u0004\b\f\u0010\t¨\u0006\u0018"}, d2 = {"Lkotlin/ranges/IntProgression;", "", "", "start", "endInclusive", "step", "(III)V", "first", "getFirst", "()I", "last", "getLast", "getStep", "equals", "", "other", "", "hashCode", "isEmpty", "iterator", "Lkotlin/collections/IntIterator;", "toString", "", "Companion", "kotlin-stdlib"}, k = 1, mv = {1, 9, 0}, xi = 48)
+/* loaded from: classes3.dex */
+public class IntProgression implements Iterable<Integer>, KMappedMarker {
+
+    /* renamed from: Companion, reason: from kotlin metadata */
+    public static final Companion INSTANCE = new Companion(null);
+    private final int first;
+    private final int last;
+    private final int step;
+
+    @Metadata(d1 = {"\u0000\u001a\n\u0002\u0018\u0002\n\u0002\u0010\u0000\n\u0002\b\u0002\n\u0002\u0018\u0002\n\u0000\n\u0002\u0010\b\n\u0002\b\u0003\b\u0086\u0003\u0018\u00002\u00020\u0001B\u0007\b\u0002¢\u0006\u0002\u0010\u0002J\u001e\u0010\u0003\u001a\u00020\u00042\u0006\u0010\u0005\u001a\u00020\u00062\u0006\u0010\u0007\u001a\u00020\u00062\u0006\u0010\b\u001a\u00020\u0006¨\u0006\t"}, d2 = {"Lkotlin/ranges/IntProgression$Companion;", "", "()V", "fromClosedRange", "Lkotlin/ranges/IntProgression;", "rangeStart", "", "rangeEnd", "step", "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 IntProgression fromClosedRange(int rangeStart, int rangeEnd, int step) {
+            return new IntProgression(rangeStart, rangeEnd, step);
+        }
+
+        private Companion() {
+        }
+    }
+
+    public IntProgression(int i, int i4, int i5) {
+        if (i5 == 0) {
+            throw new IllegalArgumentException("Step must be non-zero.");
+        }
+        if (i5 == Integer.MIN_VALUE) {
+            throw new IllegalArgumentException("Step must be greater than Int.MIN_VALUE to avoid overflow on negation.");
+        }
+        this.first = i;
+        this.last = ProgressionUtilKt.getProgressionLastElement(i, i4, i5);
+        this.step = i5;
+    }
+
+    public boolean equals(Object other) {
+        if (!(other instanceof IntProgression)) {
+            return false;
+        }
+        if (isEmpty() && ((IntProgression) other).isEmpty()) {
+            return true;
+        }
+        IntProgression intProgression = (IntProgression) other;
+        return this.first == intProgression.first && this.last == intProgression.last && this.step == intProgression.step;
+    }
+
+    public final int getFirst() {
+        return this.first;
+    }
+
+    public final int getLast() {
+        return this.last;
+    }
+
+    public final int getStep() {
+        return this.step;
+    }
+
+    public int hashCode() {
+        if (isEmpty()) {
+            return -1;
+        }
+        return (((this.first * 31) + this.last) * 31) + this.step;
+    }
+
+    public boolean isEmpty() {
+        return this.step > 0 ? this.first > this.last : this.first < this.last;
+    }
+
+    public String toString() {
+        StringBuilder sb;
+        int i;
+        if (this.step > 0) {
+            sb = new StringBuilder();
+            sb.append(this.first);
+            sb.append("..");
+            sb.append(this.last);
+            sb.append(" step ");
+            i = this.step;
+        } else {
+            sb = new StringBuilder();
+            sb.append(this.first);
+            sb.append(" downTo ");
+            sb.append(this.last);
+            sb.append(" step ");
+            i = -this.step;
+        }
+        sb.append(i);
+        return sb.toString();
+    }
+
+    @Override // java.lang.Iterable
+    public Iterator<Integer> iterator() {
+        return new IntProgressionIterator(this.first, this.last, this.step);
+    }
+}