Use this class if you are using a provider that has all the facilities you need.

For example:

     CMSSignedDataGenerator gen = new CMSSignedDataGenerator();
     ContentSigner sha1Signer = new JcaContentSignerBuilder("SHA1withRSA").setProvider("BC").build(signKP.getPrivate());

     gen.addSignerInfoGenerator(
               new JcaSignerInfoGeneratorBuilder(
                    new JcaDigestCalculatorProviderBuilder().setProvider("BC").build())
                    .build(sha1Signer, signCert));

becomes:

     CMSSignedDataGenerator gen = new CMSSignedDataGenerator();

     gen.addSignerInfoGenerator(
               new JcaSimpleSignerInfoGeneratorBuilder()
                    .setProvider("BC")
                    .build("SHA1withRSA", signKP.getPrivate(), signCert));