Feature/808 validate root certificates

core/src/main/java/dev/fitko/fitconnect/core/validation/DefaultValidationService.java

@@ -61,6 +61,7 @@ import java.net.Proxy;
 import java.net.URI;
 import java.nio.charset.StandardCharsets;
 import java.security.cert.CertificateEncodingException;
+import java.security.cert.X509Certificate;
 import java.text.SimpleDateFormat;
 import java.time.Instant;
 import java.time.ZoneId;
@@ -104,16 +105,6 @@ public class DefaultValidationService implements ValidationService {
         }
     }
 
-    @Override
-    public ValidationResult validateSignaturePublicKey(final RSAKey signatureKey) {
-        try {
-            validateKey(signatureKey, KeyOperation.VERIFY);
-        } catch (final Exception e) {
-            return ValidationResult.error(e);
-        }
-        return ValidationResult.ok();
-    }
-
     @Override
     public ValidationResult validateSetEventSchema(final String setEventPayload) {
         try {