TLS server key exchange message

[Xiaoyu Ruan]

RFC 4346 says the server key exchange message is only sent when DHE_DSS,
DHE_RSA, or DH_anon is used as the cipher suite. It further says the
server key exchange message can contain RSA or DH public components. I
am confused. If DHE_DSS, DHE_RSA, or DH_anon is used, then DH is used
for key exchange. The public key sent in the server key exchange message
must be DH public components. Under what condition would a RSA key be
sent in a server key exchange message?

 

Thanks....

 

-Xiaoyu