How to extract the public key

imc-sfl锛

	hi all, my question comes from the following case:
	When one send a signed message to me, his 
public key is included in the signed data. With
this public key, I can send some encrypted message
to him.
	
	My question is how to use the SFL API to :
1.extract the public key from the signed data
2.store the public key for later use
3.use this public key to generate a encrypted message

Thank you very much.

sincerely

            tuzi
            [email protected]