Scrypt causes UnsatisfiedLinkError

[gurpreet-]

The library throws an error:

java.lang.UnsatisfiedLinkError: Error looking up function 'crypto_pwhash_scryptsalsa208sha256_ll': undefined symbol: crypto_pwhash_scryptsalsa208sha256_ll
at com.sun.jna.Function.<init>(Function.java:245)
at com.sun.jna.NativeLibrary.getFunction(NativeLibrary.java:566)
at com.sun.jna.NativeLibrary.getFunction(NativeLibrary.java:542)
at com.sun.jna.NativeLibrary.getFunction(NativeLibrary.java:528)
at com.sun.jna.Native.register(Native.java:1777)
at com.sun.jna.Native.register(Native.java:1648)
at com.goterl.lazycode.lazysodium.SodiumAndroid.<init>(SodiumAndroid.java:37)
at com.goterl.lazycode.lazysodium.SodiumAndroid.<init>(SodiumAndroid.java:17)
at com.goterl.lazycode.lazysodium.LoadTest.loads(LoadTest.java:21)
at java.lang.reflect.Method.invoke(Native Method)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at android.support.test.runner.AndroidJUnit4.run(AndroidJUnit4.java:101)
at org.junit.runners.Suite.runChild(Suite.java:128)
at org.junit.runners.Suite.runChild(Suite.java:27)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at org.junit.runner.JUnitCore.run(JUnitCore.java:115)
at android.support.test.internal.runner.TestExecutor.execute(TestExecutor.java:56)
at android.support.test.runner.AndroidJUnitRunner.onStart(AndroidJUnitRunner.java:384)
at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1962)

This error is caused by Scrypt. The Scrypt functions do not appear in the "minimal" version of Libsodium. The minimal version is targeted towards devices with low RAM and low storage requirements such as those running Android and iOS.

Indeed, Lazysodium for Android compiles against the minimal version of Libsodium.

Instead of removing the Scrypt related functions from both Java and Android, these functions will be removed from just the Android variant.

If you really, really want to use Scrypt, then you will have to:

1. First recompile the native C Libsodium in non-minimal mode.
2. Then extend SodiumAndroid and copy in the Scrypt related functions from Lazysodium for Java.

[gurpreet-]

This has been fixed in the latest release: version 2.0.0 but also introduces some breaking changes.