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/math/Constants.java

@@ -0,0 +1,43 @@
+package kotlin.math;
+
+import kotlin.Metadata;
+import kotlin.jvm.JvmField;
+
+@Metadata(d1 = {"\u0000\u0014\n\u0002\u0018\u0002\n\u0002\u0010\u0000\n\u0002\b\u0002\n\u0002\u0010\u0006\n\u0002\b\u0006\bÂ\u0002\u0018\u00002\u00020\u0001B\u0007\b\u0002¢\u0006\u0002\u0010\u0002R\u0010\u0010\u0003\u001a\u00020\u00048\u0000X\u0081\u0004¢\u0006\u0002\n\u0000R\u0010\u0010\u0005\u001a\u00020\u00048\u0000X\u0081\u0004¢\u0006\u0002\n\u0000R\u0010\u0010\u0006\u001a\u00020\u00048\u0000X\u0081\u0004¢\u0006\u0002\n\u0000R\u0010\u0010\u0007\u001a\u00020\u00048\u0000X\u0081\u0004¢\u0006\u0002\n\u0000R\u0010\u0010\b\u001a\u00020\u00048\u0000X\u0081\u0004¢\u0006\u0002\n\u0000R\u0010\u0010\t\u001a\u00020\u00048\u0000X\u0081\u0004¢\u0006\u0002\n\u0000¨\u0006\n"}, d2 = {"Lkotlin/math/Constants;", "", "()V", "LN2", "", "epsilon", "taylor_2_bound", "taylor_n_bound", "upper_taylor_2_bound", "upper_taylor_n_bound", "kotlin-stdlib"}, k = 1, mv = {1, 9, 0}, xi = 48)
+/* loaded from: classes3.dex */
+final class Constants {
+    public static final Constants INSTANCE = new Constants();
+
+    @JvmField
+    public static final double LN2 = Math.log(2.0d);
+
+    @JvmField
+    public static final double epsilon;
+
+    @JvmField
+    public static final double taylor_2_bound;
+
+    @JvmField
+    public static final double taylor_n_bound;
+
+    @JvmField
+    public static final double upper_taylor_2_bound;
+
+    @JvmField
+    public static final double upper_taylor_n_bound;
+
+    static {
+        double ulp = Math.ulp(1.0d);
+        epsilon = ulp;
+        double sqrt = Math.sqrt(ulp);
+        taylor_2_bound = sqrt;
+        double sqrt2 = Math.sqrt(sqrt);
+        taylor_n_bound = sqrt2;
+        double d4 = 1;
+        upper_taylor_2_bound = d4 / sqrt;
+        upper_taylor_n_bound = d4 / sqrt2;
+    }
+
+    private Constants() {
+    }
+}

apk_decompiled/sources/kotlin/math/MathKt.java

@@ -0,0 +1,15 @@
+package kotlin.math;
+
+import kotlin.Metadata;
+
+@Metadata(d1 = {"kotlin/math/MathKt__MathHKt", "kotlin/math/MathKt__MathJVMKt"}, k = 4, mv = {1, 9, 0}, xi = 49)
+/* loaded from: classes3.dex */
+public final class MathKt extends MathKt__MathJVMKt {
+
+    /* renamed from: E, reason: collision with root package name */
+    public static final double f7119E = 2.718281828459045d;
+    public static final double PI = 3.141592653589793d;
+
+    private MathKt() {
+    }
+}

apk_decompiled/sources/kotlin/math/MathKt__MathHKt.java

@@ -0,0 +1,16 @@
+package kotlin.math;
+
+import kotlin.Metadata;
+import kotlin.SinceKotlin;
+
+@Metadata(d1 = {"\u0000\n\n\u0000\n\u0002\u0010\u0006\n\u0002\b\u0005\"\u0016\u0010\u0000\u001a\u00020\u00018\u0006X\u0087T¢\u0006\b\n\u0000\u0012\u0004\b\u0002\u0010\u0003\"\u0016\u0010\u0004\u001a\u00020\u00018\u0006X\u0087T¢\u0006\b\n\u0000\u0012\u0004\b\u0005\u0010\u0003¨\u0006\u0006"}, d2 = {"E", "", "getE$annotations", "()V", "PI", "getPI$annotations", "kotlin-stdlib"}, k = 5, mv = {1, 9, 0}, xi = 49, xs = "kotlin/math/MathKt")
+/* loaded from: classes3.dex */
+class MathKt__MathHKt {
+    @SinceKotlin(version = "1.2")
+    public static /* synthetic */ void getE$annotations() {
+    }
+
+    @SinceKotlin(version = "1.2")
+    public static /* synthetic */ void getPI$annotations() {
+    }
+}

apk_decompiled/sources/kotlin/math/UMathKt.java

@@ -0,0 +1,44 @@
+package kotlin.math;
+
+import kotlin.ExperimentalUnsignedTypes;
+import kotlin.Metadata;
+import kotlin.SinceKotlin;
+import kotlin.WasExperimental;
+import kotlin.comparisons.UComparisonsKt;
+import kotlin.internal.InlineOnly;
+
+@Metadata(d1 = {"\u0000\u0012\n\u0000\n\u0002\u0018\u0002\n\u0002\b\u0004\n\u0002\u0018\u0002\n\u0002\b\u0006\u001a \u0010\u0000\u001a\u00020\u00012\u0006\u0010\u0002\u001a\u00020\u00012\u0006\u0010\u0003\u001a\u00020\u0001H\u0087\b¢\u0006\u0004\b\u0004\u0010\u0005\u001a \u0010\u0000\u001a\u00020\u00062\u0006\u0010\u0002\u001a\u00020\u00062\u0006\u0010\u0003\u001a\u00020\u0006H\u0087\b¢\u0006\u0004\b\u0007\u0010\b\u001a \u0010\t\u001a\u00020\u00012\u0006\u0010\u0002\u001a\u00020\u00012\u0006\u0010\u0003\u001a\u00020\u0001H\u0087\b¢\u0006\u0004\b\n\u0010\u0005\u001a \u0010\t\u001a\u00020\u00062\u0006\u0010\u0002\u001a\u00020\u00062\u0006\u0010\u0003\u001a\u00020\u0006H\u0087\b¢\u0006\u0004\b\u000b\u0010\b¨\u0006\f"}, d2 = {"max", "Lkotlin/UInt;", "a", "b", "max-J1ME1BU", "(II)I", "Lkotlin/ULong;", "max-eb3DHEI", "(JJ)J", "min", "min-J1ME1BU", "min-eb3DHEI", "kotlin-stdlib"}, k = 2, mv = {1, 9, 0}, xi = 48)
+/* loaded from: classes3.dex */
+public final class UMathKt {
+    @SinceKotlin(version = "1.5")
+    @WasExperimental(markerClass = {ExperimentalUnsignedTypes.class})
+    @InlineOnly
+    /* renamed from: max-J1ME1BU, reason: not valid java name */
+    private static final int m1325maxJ1ME1BU(int i, int i4) {
+        return UComparisonsKt.m1297maxOfJ1ME1BU(i, i4);
+    }
+
+    @SinceKotlin(version = "1.5")
+    @WasExperimental(markerClass = {ExperimentalUnsignedTypes.class})
+    @InlineOnly
+    /* renamed from: max-eb3DHEI, reason: not valid java name */
+    private static final long m1326maxeb3DHEI(long j4, long j5) {
+        return UComparisonsKt.m1305maxOfeb3DHEI(j4, j5);
+    }
+
+    @SinceKotlin(version = "1.5")
+    @WasExperimental(markerClass = {ExperimentalUnsignedTypes.class})
+    @InlineOnly
+    /* renamed from: min-J1ME1BU, reason: not valid java name */
+    private static final int m1327minJ1ME1BU(int i, int i4) {
+        return UComparisonsKt.m1309minOfJ1ME1BU(i, i4);
+    }
+
+    @SinceKotlin(version = "1.5")
+    @WasExperimental(markerClass = {ExperimentalUnsignedTypes.class})
+    @InlineOnly
+    /* renamed from: min-eb3DHEI, reason: not valid java name */
+    private static final long m1328mineb3DHEI(long j4, long j5) {
+        return UComparisonsKt.m1317minOfeb3DHEI(j4, j5);
+    }
+}