Getting crash in 5, 6, and 7 android version

[luckysenjaya]

Based on discussion on this #https://github.com/l0s/fernet-java8/issues/377 I changed my code to be like this :

val keyByte = Base64.decode(keyString, Base64.URL_SAFE)
val key = Key(keyByte)
val tokenByte = Base64.decode(encrypted, Base64.URL_SAFE)
val token = Token.fromBytes(tokenByte)

val validator: Validator<String> = object : StringValidator {
    override fun getTimeToLive(): TemporalAmount {
        return Duration.ofHours(1)
    }
}
target = token.validateAndDecrypt(key, validator) 

but the crash still happening

    java.lang.NoClassDefFoundError: Failed resolution of: Ljava/util/Base64;
        at com.macasaet.fernet.Constants.<clinit>(Constants.java:37)
        at com.macasaet.fernet.StringValidator$-CC.$default$getCharset(StringValidator.java:36)
        at com.julofinance.juloapp.utils.Utils2$decryptFernetEncryption$validator$1.getCharset(Utils2.kt)
        at com.macasaet.fernet.StringValidator$-CC.lambda$getTransformer$0(StringValidator.java:41)
        at com.macasaet.fernet.-$$Lambda$StringValidator$gDRwV6XvTN55-2t20AK2HDVrFfY.apply(lambda)
        at com.macasaet.fernet.Validator$-CC.$default$validateAndDecrypt(Validator.java:105)
        at com.julofinance.juloapp.utils.Utils2$decryptFernetEncryption$validator$1.validateAndDecrypt(Utils2.kt)
        at com.macasaet.fernet.Token.validateAndDecrypt(Token.java:228)

Caused by: java.lang.ClassNotFoundException: Didn't find class "java.util.Base64" on path: DexPathList[[zip file "/data/app/com.julofinance.juloapp-2/base.apk"],nativeLibraryDirectories=[/data/app/com.julofinance.juloapp-2/lib/x86, /vendor/lib, /system/lib]]
        at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
        at com.macasaet.fernet.Constants.<clinit>(Constants.java:37) 
        at com.macasaet.fernet.StringValidator$-CC.$default$getCharset(StringValidator.java:36) 
        at com.julofinance.juloapp.utils.Utils2$decryptFernetEncryption$validator$1.getCharset(Utils2.kt) 
        at com.macasaet.fernet.StringValidator$-CC.lambda$getTransformer$0(StringValidator.java:41) 
        at com.macasaet.fernet.-$$Lambda$StringValidator$gDRwV6XvTN55-2t20AK2HDVrFfY.apply(lambda) 
        at com.macasaet.fernet.Validator$-CC.$default$validateAndDecrypt(Validator.java:105) 
        at com.julofinance.juloapp.utils.Utils2$decryptFernetEncryption$validator$1.validateAndDecrypt(Utils2.kt) 
        at com.macasaet.fernet.Token.validateAndDecrypt(Token.java:228) 

please help

[l0s]

@luckysenjaya do you have a full sample Android project that reproduces this issue? I tried to create a simple "hello world" app that generates then decrypts a token, but I am not able to reproduce that error.

As an aside, are you using ProGuard to minify the APK? It should remove any unused fields like the Java 8 encoders.

Here is an example based on the Fernet test vector and the default "Hello World" from Android Studio:

    val key = Key(
        Base64.decode(
            "cw_0x689RpI-jtRR7oE8h_eQsKImvJapLeSbXpwF4e4=",
            Base64.URL_SAFE
        )
    )
    val token = Token.fromBytes(
        Base64.decode(
            "gAAAAAAdwJ6wAAECAwQFBgcICQoLDA0ODy021cpGVWKZ_eEwCGM4BLLF_5CV9dOPmrhuVUPgJobwOz7JcbmrR64jVmpU4IwqDA==",
            Base64.URL_SAFE
        )
    )
    val validator: Validator<String> = object : StringValidator {
        @RequiresApi(Build.VERSION_CODES.O)
        override fun getClock(): Clock {
            return Clock.fixed(
                Year.of(1985).atMonth(10).atDay(26)
                    .atTime(1, 20, 1)
                    .atZone(ZoneOffset.ofHours(-7))
                    .toInstant(),
                ZoneOffset.ofHours(-7)
            )
        }
    }

    val textView = findViewById<TextView>(R.id.textView)
    textView.text = token.validateAndDecrypt(key, validator)