ok risolto, dovevo installare due dipendenze (io avevo provato installando solo la prima):
codice:
    <dependency>
      <groupId>org.bouncycastle</groupId>
      <artifactId>bcprov-jdk15to18</artifactId>
      <version>1.72</version>
    </dependency>
    <dependency>
      <groupId>org.bouncycastle</groupId>
      <artifactId>bcpkix-jdk15to18</artifactId>
      <version>1.72</version>
    </dependency>