import org.spongycastle.jce.provider.BouncyCastleProvider;
   Security.addProvider(new BouncyCastleProvider());
                    KeyFactory factory = KeyFactory.getInstance("ESDSA", "BC");
                    publicKeyServer = (ECPublicKey) factory.generatePublic(new X509EncodedKeySpec(bytePubKeyServer));

这是我试图添加bounycastleprovider的代码。bouncycastlejar在android上不工作，所以我看到我需要使用海绵状castlejar。所以我加了海绵城堡罐现在我卡住了。在这段代码中，我尝试将字节转换为公钥。
这是错误消息

java.lang.NoClassDefFoundError: Failed resolution of: Lorg/spongycastle/util/Strings

buildscript {
    repositories {
        google()
        jcenter()
    }
    dependencies {
        classpath "com.android.tools.build:gradle:4.1.3"
        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
        implementation 'com.madgag.spongycastle:bctls-jdk15on:1.58.0.0'
    }

}

allprojects {
    repositories {
        google()
        jcenter()
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}