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/s3/f.java

@@ -0,0 +1,62 @@
+package s3;
+
+import java.io.IOException;
+import kotlin.jvm.internal.Intrinsics;
+import r3.C0576h;
+import r3.I;
+import r3.p;
+
+/* loaded from: classes3.dex */
+public final class f extends p {
+
+    /* renamed from: a, reason: collision with root package name */
+    public final long f8481a;
+
+    /* renamed from: b, reason: collision with root package name */
+    public final boolean f8482b;
+
+    /* renamed from: c, reason: collision with root package name */
+    public long f8483c;
+
+    /* JADX WARN: 'super' call moved to the top of the method (can break code semantics) */
+    public f(I delegate, long j4, boolean z3) {
+        super(delegate);
+        Intrinsics.checkNotNullParameter(delegate, "delegate");
+        this.f8481a = j4;
+        this.f8482b = z3;
+    }
+
+    /* JADX WARN: Multi-variable type inference failed */
+    /* JADX WARN: Type inference failed for: r0v5, types: [java.lang.Object, r3.h] */
+    @Override // r3.p, r3.I
+    public final long read(C0576h sink, long j4) {
+        Intrinsics.checkNotNullParameter(sink, "sink");
+        long j5 = this.f8483c;
+        long j6 = this.f8481a;
+        if (j5 > j6) {
+            j4 = 0;
+        } else if (this.f8482b) {
+            long j7 = j6 - j5;
+            if (j7 == 0) {
+                return -1L;
+            }
+            j4 = Math.min(j4, j7);
+        }
+        long read = super.read(sink, j4);
+        if (read != -1) {
+            this.f8483c += read;
+        }
+        long j8 = this.f8483c;
+        if ((j8 >= j6 || read != -1) && j8 <= j6) {
+            return read;
+        }
+        if (read > 0 && j8 > j6) {
+            long j9 = sink.f8284b - (j8 - j6);
+            ?? obj = new Object();
+            obj.D(sink);
+            sink.z(obj, j9);
+            obj.d();
+        }
+        throw new IOException("expected " + j6 + " bytes but got " + this.f8483c);
+    }
+}