code: @Override
      public byte[] signManifestFile(byte[] manifestJSON, PKSigningInformation signingInformation) throws PKSigningException {
          Assert.notNull(manifestJSON, "Manifest JSON is mandatory");
          CMSProcessableByteArray content = new CMSProcessableByteArray(manifestJSON);
          return signManifestUsingContent(signingInformation, content);
      }
docs: /*
  (non-Javadoc)
  
  @see de.brendamour.jpasskit.signing.IPKSigningUtil#signManifestFile(byte[], de.brendamour.jpasskit.signing.PKSigningInformation)