`KeyHelper.generateIdentityKeyPair()` throws `k.c.a.d `exception

[sharpstar2000]

KeyHelper.generateIdentityKeyPair() throws k.c.a.d exception

    debug {
            minifyEnabled true   // Obfuscate and minify codes
            shrinkResources true // Remove unused resources
            useProguard true
            debuggable true
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }

Originally posted by @malik082009 in https://github.com/signalapp/libsignal-protocol-java/issues/74

[malik082009]

adding

-dontoptimize
-dontobfuscate
-keepattributes SourceFile,LineNumberTable
-keep class org.whispersystems.** { *; }
-keep class org.thoughtcrime.securesms.** { *; }
-keepclassmembers class ** {
    public void onEvent*(**);

in progaurd-rules.pro resolved the issue.