-keep class org.spongycastle.jcajce.provider.digest.SHA256** {*;}
-keepclassmembers class org.spongycastle.jcajce.provider.digest.SHA256** {*;}

-keep class org.spongycastle.jcajce.provider.asymmetric.RSA**
-keepclassmembers class org.spongycastle.jcajce.provider.asymmetric.RSA** {*;}

-keep class org.spongycastle.jcajce.provider.asymmetric.rsa.DigestSignatureSpi** {*;}
-keepclassmembers class org.spongycastle.jcajce.provider.asymmetric.rsa.DigestSignatureSpi** {*;}