static String getKeyType() {
    return "type.googleapis.com/google.crypto.tink.JwtEcdsaPublicKey";
  }
This key manager produces new instances of {@code JwtEcdsaVerify}. It doesn't support key
generation.
java_src/src/main/java/com/google/crypto/tink/jwt/JwtEcdsaVerifyKeyManager.java