.B ec
(elliptic curves). The default is
.BR dh .
-.ne 7
+.ne 9
.TP
.I kx-genalg
Key generation algorithm name to pass to
_
dh dh
ec ec
+x25519 x25519
+x448 x448
_
.TE
-.ne 7
+.ne 9
.TP
.I kx-param-genalg
Key generation algorithm name to pass to
_
dh dh-param
ec ec-param
+x25519 empty
+x448 empty
_
.TE
-.ne 7
+.ne 9
.TP
.I kx-param
Options to pass to
_
dh \-LS \-b3072 \-B256
ec \-Cnist-p256
+x25519 \fInone
+x448 \fInone
_
.TE
+.ne 9
.TP
.I kx-attrs
Additional attributes to set on the parameters
as
.IB key = value
pairs separated by spaces.
-Default is
-.BR serialization=constlen .
+Default depends on
+.I kx
+as follows.
+.TS
+center;
+| ci | ci |
+| lb | lb |.
+_
+kx kx-attrs
+_
+dh serialization=constlen
+ec serialization=constlen
+x25519 \fIempty
+x448 \fIempty
+_
+.TE
.TP
.I kx-expire
Expiry time for generated keys. Default is
naclbox chacha20
_
.TE
-.ne 7
+.ne 8
.TP
.I sig
Signature scheme to use. Must be one of those recognized by
_
dh dsa
ec ecdsa
+x25519 ed25519
+x448 ed448
_
.TE
.ne 12