RSA Key Exchange
This KEX method is not currently supported by the test suite.
SSH Public Key File Format
DSA, ECDSA, RSA and PKCS8 formats are used by the suite
Additional Diffie-Hellman Groups
Specified MODP and ECP groups are not specifically supported by the test suite, only generic groups
AES Galois Counter Mode
AES-*-GCM cipher modes (and the built-in integrity modes) are not supported by the test suite
X.509 host key certificates for Secure Shell (SSH)
This specification is not relevant for a server test suite, included in this list for completion.
Suite B Compliance
This is not a technical specification, but mentioned here for completion. This specification is not supported because some of its components are not supported, namely AEAD_AES_*_GCM cipher/integrity algorithms defined in RFC 5647.
Two-way cipher separation
SSHv2 supports separate cipher/digest suites for outgoing and incoming messages. At the moment the suite requests and assumes that both directions have the same cipher/digest.