signeddata and envelopeddata in PKCS#7

Hi everyone, 
I'm bouncycastle newbie and I need help. 
I need to sign data, in the PKCS#7 format, and then encrypt it. 
The formats used to envelope signed and encrypted data shall comply with
PKCS#7 v 1.5, signedData and envelopedData (mixed standard S/MIME, with
signature envelope and encryption compliant to PKCS#7 v.1.5, DER encrypted). 
During encryption, the data must be encrypted using a symmetric key
algorithm, generated randomly each time. The key used must be inserted in
the envelope, and encrypted with the recipient's public RSA key. 

Can anyone help me? 

Thanks and regards 
Salvatore



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