capture exact error message when signature check fails

register-core/src/main/java/org/opengroup/osdu/register/api/test/SubscriberListenerApi.java

@@ -62,7 +62,7 @@ public class SubscriberListenerApi {
             // Use the secret you send to the subscriber registration create request
             return new ChallengeResponse(HashingUtil.hashString(crc, this.serviceConfig.getSubscriberSecret()));
         } catch (SignatureServiceException e) {
-            throw new ValidationException("Authorization signature validation Failed");
+            throw new ValidationException(e.getMessage());
         }
     }
 
@@ -78,7 +78,7 @@ public class SubscriberListenerApi {
                 logger.error("An error occurred in Test Acknowledgement: " + e.toString());
             }
         } catch (SignatureServiceException e) {
-            throw new ValidationException("Authorization signature validation Failed");
+            throw new ValidationException(e.getMessage());
         }
     }
 }