Key invalid in messgae error (BouncyCastle Encryption)

Question

I am trying to use bouncycastle to encrypt some data but am getting a "key invalid in message" error whenever I run it. My question is: what the hell could this mean? what could i be doing wrong. I get a feeling it's not a code issue, so what could it be?
This is the actual place it falls over at:
CMSEnvelopedData envData = envGenerator.generate( new CMSProcessableByteArray(signed),CMSEnvelopedDataGenerator.DES_EDE3_CBC, 192,"BC" );
Please help. I am officially confused.

Answer 1

I have the same exception but with an other problem. I want to read an encrypted mail.
KeyStore    ks = KeyStore.getInstance("PKCS12", "BC");
            ks.load(new FileInputStream("/coucou.pfx"), "azerty".toCharArray());
            Enumeration e = ks.aliases();
            String      keyAlias = null;
            while (e.hasMoreElements())
                String  alias = (String)e.nextElement();
                if (ks.isKeyEntry(alias))
                    keyAlias = alias;
            X509Certificate cert = (X509Certificate)ks.getCertificate(keyAlias);
            RecipientId     recId = new RecipientId();
            recId.setSerialNumber(cert.getSerialNumber());
            recId.setIssuer(cert.getIssuerX500Principal().getEncoded());
            SMIMEEnveloped       m = new SMIMEEnveloped(msg);
            RecipientInformationStore   recipients = m.getRecipientInfos();
            RecipientInformation        recipient = recipients.get(recId);
            Iterator iterator = recipients.getRecipients().iterator();
            while(iterator.hasNext())
                 RecipientInformation temp = (RecipientInformation)iterator.next();
                 if(temp!=null)
                      recipient = temp;
            MimeBodyPart        res = SMIMEUtil.toMimeBodyPart(recipient.getContent(ks.getKey(keyAlias, null), "BC"));
            System.out.println(res.getContent());The message "Key invalid in message error " appears at the line :
MimeBodyPart        res = SMIMEUtil.toMimeBodyPart(recipient.getContent(ks.getKey(keyAlias, null), "BC"));Please help !