Bug 🐛 : The `tnoodle-lib` couldn't get `SecureRandomInstance`

[JessieOuO]

Description

Reproduction Steps:

1. Launch the App
2. Check the logs

Result:

2026-01-24 15:25:06.948  6536-6536  System.err              com.rickyhu.hushtimer.androidApp     W  SLF4J(W): No SLF4J providers were found.
2026-01-24 15:25:06.948  6536-6536  System.err              com.rickyhu.hushtimer.androidApp     W  SLF4J(W): Defaulting to no-operation (NOP) logger implementation
2026-01-24 15:25:06.948  6536-6536  System.err              com.rickyhu.hushtimer.androidApp     W  SLF4J(W): See https://www.slf4j.org/codes.html#noProviders for further details.
2026-01-24 15:25:07.079  6536-6676  Puzzle                  com.rickyhu.hushtimer.androidApp     E  Couldn't get SecureRandomInstance
                                                                                                    java.security.NoSuchProviderException: no such provider: SUN
                                                                                                    	at sun.security.jca.GetInstance.getService(GetInstance.java:83)
                                                                                                    	at sun.security.jca.GetInstance.getInstance(GetInstance.java:206)
                                                                                                    	at java.security.SecureRandom.getInstance(SecureRandom.java:494)
                                                                                                    	at org.worldcubeassociation.tnoodle.scrambles.Puzzle.getSecureRandom(Puzzle.java:115)
                                                                                                    	at org.worldcubeassociation.tnoodle.scrambles.Puzzle.<init>(Puzzle.java:111)
                                                                                                    	at org.worldcubeassociation.tnoodle.puzzle.CubePuzzle.<init>(CubePuzzle.java:113)
                                                                                                    	at org.worldcubeassociation.tnoodle.puzzle.ThreeByThreeCubePuzzle.<init>(ThreeByThreeCubePuzzle.java:24)
                                                                                                    	at java.lang.reflect.Constructor.newInstance0(Native Method)
                                                                                                    	at java.lang.reflect.Constructor.newInstance(Constructor.java:343)
                                                                                                    	at org.worldcubeassociation.tnoodle.scrambles.LazySupplier.provideInstance(LazySupplier.java:28)
                                                                                                    	at org.worldcubeassociation.tnoodle.scrambles.LazySupplier.getInstance(LazySupplier.java:18)
                                                                                                    	at org.worldcubeassociation.tnoodle.scrambles.PuzzleRegistry.getScrambler(PuzzleRegistry.java:30)
                                                                                                    	at com.rickyhu.hushtimer.timer.data.ScrambleRepositoryImplKt.toScrambler(ScrambleRepositoryImpl.kt:31)
                                                                                                    	at com.rickyhu.hushtimer.timer.data.ScrambleRepositoryImpl.generateScramble(ScrambleRepositoryImpl.kt:13)
                                                                                                    	at com.rickyhu.hushtimer.timer.presentation.TimerViewModel$fetchScramble$2.invokeSuspend(TimerViewModel.kt:473)
                                                                                                    	at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:34)

Expected Result:
It gets SecureRandomInstance normally.

Note:
This is related to issue: Couldn't get SecureRandomInstance.

Device

Model: Pixel 9 Pro XL (simulator)
OS: Android 16 (API 36.1)
Build : d5fb724

[JessieOuO]

Hi @Xanonymous-GitHub,
please help to check if there is a same issue on iOS environment.

[Xanonymous-GitHub]

@JessieOuO This has been solved at https://github.com/Xanonymous-GitHub/tnoodle-lib/pull/2/changes#diff-772acab80d7511c8be101d7ee297b12163875fe8065a86174510227bc84e0016.

The root cause is how we get an instance of SecureRandom.

SecureRandom.getInstance("SHA1PRNG", "SUN"); // as-is

private static final SecureRandom r = new SecureRandom(); // to-be

I think it is because they want to use SHA1PRNG method of random generation so they used implementation source from "SUN". In modern JDK nowadays, we can let SecureRandom choose the impl provider itself, as we now have better choice which is DRBG.