Reviewed-by: xuelei

Reviewed-by: wetmore, ahgross, asmotrak, xuelei

Reviewed-by: wetmore, ahgross, asmotrak, xuelei

Reviewed-by: jnimeh, mullan, wetmore, ahgross, asmotrak

Reviewed-by: jnimeh, mullan, wetmore, ahgross, asmotrak

Summary: the signature of server key exanage message could be null
Reviewed-by: vinnie

6985179: To support Server Name Indication extension for JSSE client
Summary: Introduces the algorithm constraints to support signature and hash algorithm selection. Includes contributions from wetmore and weijung.
Reviewed-by: wetmore, weijun

Reviewed-by: darcy, weijun