static String getKeyType() {
    return "type.googleapis.com/google.crypto.tink.RsaSsaPssPrivateKey";
  }
This key manager generates new {@code RsaSsaPssPrivateKey} keys and produces new instances of
{@code RsaSsaPssSignJce}.
java_src/src/main/java/com/google/crypto/tink/signature/RsaSsaPssSignKeyManager.java