X-Git-Url: https://git.distorted.org.uk/~mdw/tripe/blobdiff_plain/b86e6f3fab7736f9f70131be1c48434d377a4ae0..9dd1db76f03d49c394f136658a0c60b88be07113:/server/tripe.8.in?ds=sidebyside

diff --git a/server/tripe.8.in b/server/tripe.8.in
index 33f07b52..3997e1db 100644
--- a/server/tripe.8.in
+++ b/server/tripe.8.in
@@ -349,6 +349,69 @@ key add \-aec \-pparam \-talice \e
 	\-e"now + 1 year" tripe
 .VE
 .RE
+.sv -1
+.TP
+.B x25519
+.RS
+Use Bernstein's X25519 Diffie\(enHellman function.
+This is technically a variant on
+the general elliptic curve Diffie\(enHellman
+available through the
+.B ec
+setting,
+but carefully designed and heavily optimized.
+.PP
+To create
+.B x25519
+keys,
+say something like
+.VS
+key add \-aempty \-eforever \e
+	\-tparam tripe\-param kx-group=x25519
+.VE
+to construct a parameters key
+(see
+.BR key (1)
+for details);
+and create the private keys by
+.VS
+key add \-ax25519 \-pparam \-talice \e
+	\-e"now + 1 year" tripe
+.VE
+.RE
+.sv -1
+.TP
+.B x448
+.RS
+Use Hamburg's X448 Diffie\(enHellman function.
+Like
+.B x25519
+above,
+this is technically a variant on
+the general elliptic curve Diffie\(enHellman
+available through the
+.B ec
+setting,
+but carefully designed and heavily optimized.
+.PP
+To create
+.B x448
+keys,
+say something like
+.VS
+key add \-aempty \-eforever \e
+	\-tparam tripe\-param kx-group=x448
+.VE
+to construct a parameters key
+(see
+.BR key (1)
+for details);
+and create the private keys by
+.VS
+key add \-ax448 \-pparam \-talice \e
+	\-e"now + 1 year" tripe
+.VE
+.RE
 Note that the
 .BR tripe-keys (8)
 program provides a rather more convenient means for generating and
@@ -387,6 +450,18 @@ be followed by a
 and the desired tag length in bits.  The default is
 .IB hash \-hmac
 at half the underlying hash function's output length.
+If the MAC's name contains a
+.RB ` / '
+character,
+e.g.,
+.RB ` sha512/256 ',
+then an
+.I additional
+.RB ` / '
+and the tag size is required to disambiguate,
+so, e.g.,
+one might write
+.RB ` sha512/256/256 '.
 .TP
 .B mgf
 A `mask-generation function', used in the key-exchange.  The default is
@@ -412,6 +487,48 @@ more significantly, the transform is entirely deterministic, so (a) it
 doesn't need the (possibly slow) random number generator, and (b) it
 closes a kleptographic channel, over which a compromised implementation
 could leak secret information to a third party.
+.TP
+.B naclbox
+A transform based on the NaCl
+.B crypto_secretbox
+transformation.
+The main difference is that NaCl uses XSalsa20,
+while TrIPE uses plain Salsa20 or ChaCha,
+because it doesn't need the larger nonce space.
+You can set the
+.B cipher
+key attribute to one of
+.BR salsa20 ,
+.BR salsa20/12 ,
+.BR salsa20/8 ,
+.BR chacha20 ,
+.BR chacha12 ,
+or
+.B chacha8
+to select the main cipher.
+You can set the
+.B mac
+key attribute to
+.B poly1305
+or
+.B poly1305/128
+but these are the default and no other choice is permitted.
+(This is for forward compatibility,
+in case other MACs and/or tag sizes are allowed later.)
+.SS "Other key attributes"
+The following attributes can also be set on keys.
+.TP
+.B serialization
+Selects group-element serialization formats.
+The recommended setting is
+.BR constlen ,
+which selects a constant-length encoding when hashing group elements.
+The default,
+for backwards compatibility, is
+.BR v0 ;
+but this is deprecated.
+(The old format uses a variable length format for hashing,
+which can leak information through timing.)
 .SS "Using SLIP interfaces"
 Though not for the faint of heart, it is possible to get
 .B tripe