CertStore certs = CertStore.getInstance("Collection",
new CollectionCertStoreParameters(certList), "BC");
SMIMEEnvelopedGenerator encGen = new SMIMEEnvelopedGenerator();
encGen.addKeyTransRecipient(origCert);
MimeBodyPart mp = encGen.generate(msg, SMIMEEnvelopedGenerator.AES128_CBC, "BC");
ASN1EncodableVector signedAttrs = generateSignedAttributes();
SMIMESignedGenerator gen = new SMIMESignedGenerator();