Implement Elliptic Curve Cryptography modes for key exchange (ECDH) and

host/user keys (ECDSA) as specified by RFC5656. ECDH and ECDSA offer
better performance than plain DH and DSA at the same equivalent symmetric
key length, as well as much shorter keys.

Only the mandatory sections of RFC5656 are implemented, specifically the
three REQUIRED curves nistp256, nistp384 and nistp521 and only ECDH and
ECDSA. Point compression (optional in RFC5656 is NOT implemented).

Certificate host and user keys using the new ECDSA key types are supported.

Note that this code has not been tested for interoperability and may be
subject to change.

feedback and ok markus@

1 files changed, 14 insertions, 6 deletions

diff --git a/usr.bin/ssh/sshd.8 b/usr.bin/ssh/sshd.8
index f194697dff8..ee6f40f7d25 100644
--- a/usr.bin/ssh/sshd.8
+++ b/usr.bin/ssh/sshd.8
@@ -34,8 +34,8 @@
 .\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 .\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 .\"
-.\" $OpenBSD: sshd.8,v 1.258 2010/08/08 19:36:30 jmc Exp $
-.Dd $Mdocdate: August 8 2010 $
+.\" $OpenBSD: sshd.8,v 1.259 2010/08/31 11:54:45 djm Exp $
+.Dd $Mdocdate: August 31 2010 $
 .Dt SSHD 8
 .Os
 .Sh NAME
@@ -170,9 +170,10 @@ host key files are normally not readable by anyone but root).
 The default is
 .Pa /etc/ssh/ssh_host_key
 for protocol version 1, and
-.Pa /etc/ssh/ssh_host_rsa_key
+.Pa /etc/ssh/ssh_host_dsa_key ,
+.Pa /etc/ssh/ssh_host_ecdsa_key
 and
-.Pa /etc/ssh/ssh_host_dsa_key
+.Pa /etc/ssh/ssh_host_rsa_key
 for protocol version 2.
 It is possible to have multiple host key files for
 the different protocol versions and host key algorithms.
@@ -275,7 +276,7 @@ though this can be changed via the
 .Cm Protocol
 option in
 .Xr sshd_config 5 .
-Protocol 2 supports both RSA and DSA keys;
+Protocol 2 supports DSA, ECDSA and RSA keys;
 protocol 1 only supports RSA keys.
 For both protocols,
 each host has a host-specific key,
@@ -456,6 +457,9 @@ protocol version 1; the
 comment field is not used for anything (but may be convenient for the
 user to identify the key).
 For protocol version 2 the keytype is
+.Dq ecdsa-sha2-nistp256 ,
+.Dq ecdsa-sha2-nistp384 ,
+.Dq ecdsa-sha2-nistp521 ,
 .Dq ssh-dss
 or
 .Dq ssh-rsa .
@@ -467,6 +471,7 @@ keys up to 16 kilobits.
 You don't want to type them in; instead, copy the
 .Pa identity.pub ,
 .Pa id_dsa.pub ,
+.Pa id_ecdsa.pub ,
 or the
 .Pa id_rsa.pub
 file and edit it.
@@ -765,7 +770,8 @@ secret, but the recommended permissions are read/write/execute for the user,
 and not accessible by others.
 .Pp
 .It Pa ~/.ssh/authorized_keys
-Lists the public keys (RSA/DSA) that can be used for logging in as this user.
+Lists the public keys (DSA/ECDSA/RSA) that can be used for logging in
+as this user.
 The format of this file is described above.
 The content of the file is not highly sensitive, but the recommended
 permissions are read/write for the user, and not accessible by others.
@@ -844,6 +850,7 @@ rlogin/rsh.
 .Pp
 .It Pa /etc/ssh/ssh_host_key
 .It Pa /etc/ssh/ssh_host_dsa_key
+.It Pa /etc/ssh/ssh_host_ecdsa_key
 .It Pa /etc/ssh/ssh_host_rsa_key
 These three files contain the private parts of the host keys.
 These files should only be owned by root, readable only by root, and not
@@ -854,6 +861,7 @@ does not start if these files are group/world-accessible.
 .Pp
 .It Pa /etc/ssh/ssh_host_key.pub
 .It Pa /etc/ssh/ssh_host_dsa_key.pub
+.It Pa /etc/ssh/ssh_host_ecdsa_key.pub
 .It Pa /etc/ssh/ssh_host_rsa_key.pub
 These three files contain the public parts of the host keys.
 These files should be world-readable but writable only by