docs: public static JsonWebKey fromEC(KeyPair keyPair, Provider provider) {
  
          ECPublicKey apub = (ECPublicKey) keyPair.getPublic();
          ECPoint point = apub.getW();
          ECPrivateKey apriv = (ECPrivateKey) keyPair.getPrivate();
  
          if (apriv != null) {
              return new JsonWebKey().withKty(JsonWebKeyType.EC).withCrv(getCurveFromKeyPair(keyPair, provider))
                      .withX(point.getAffineX().toByteArray()).withY(point.getAffineY().toByteArray())
                      .withD(apriv.getS().toByteArray()).withKty(JsonWebKeyType.EC);
          } else {
              return new JsonWebKey().withKty(JsonWebKeyType.EC).withCrv(getCurveFromKeyPair(keyPair, provider))
                      .withX(point.getAffineX().toByteArray()).withY(point.getAffineY().toByteArray())
                      .withKty(JsonWebKeyType.EC);
          }
      }