Example of using X509Certificate to Decrypt

[harris]

Hi there. I am trying to use AS3Crypto to decrypt information within
a Flex client that was encrypted using a private key. I have read in
the corresponding certificate within ActionScript and confirmed it is
being done correctly via:

var bytes:ByteArray = decoder.toByteArray();
var certificate:X509Certificate = new X509Certificate( bytes );
var commonName:String = certificate.getCommonName()
trace("common name: " + commonName );

However... when I try to use the public key associated with this
certificate I get an error:

var publicKey:RSAKey = certificate.getPublicKey();
var encryptedBytes:ByteArray = decoder.toByteArray();
var decryptedBytes:ByteArray = new ByteArray();
publicKey.decrypt( encryptedBytes, decryptedBytes,
encryptedBytes.length );

Calling the decrypt method throws an error; after looking at the
getPublicKey method of X509Certificate it is clear that the returned
RSAKey will never be able to perform decryption b/c the "D" parameter
is not populated.

Can someone give me a quick example of how to use the RSAKey.decrypt
method that is derived from an X509Certificate ? Is this possible?

Thanks,

~harris