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Add commonly used constants.

--- a/lib/crypto/curve25519.myr

+++ b/lib/crypto/curve25519.myr

@@ -50,9 +50,16 @@

 use std

 pkg crypto =

-	const curve25519 : (pub : byte[:/*32*/], secret : byte[:/*32*/], basepoint : byte[:/*32*/] -> void)

+	const Nine		: byte[:]

+	const curve25519	: (pub : byte[:/*32*/], secret : byte[:/*32*/], basepoint : byte[:/*32*/] -> void)

 ;;

+const Nine =  \

+	"\x09\x00\x00\x00\x00\x00\x00\x00" \

+	"\x00\x00\x00\x00\x00\x00\x00\x00" \

+	"\x00\x00\x00\x00\x00\x00\x00\x00" \

+	"\x00\x00\x00\x00\x00\x00\x00\x00"

+

 /* Sum two numbers: out += in */

 const fsum = {out, in

 	for var i = 0; i < 10; i += 2

@@ -692,11 +699,14 @@

 	var z : int64[11]	/* one extra for reduced coefficients */

 	var zmone : int64[10]

+	std.assert(pub.len == 32 , "wrong pubkey size\n")

+	std.assert(secret.len == 32 , "wrong secret size\n")

+	std.assert(basepoint.len == 32 , "wrong basepoint size\n")

+

 	secret[0] &= 248

 	secret[31] &= 127

 	secret[31] |= 64

-	std.assert(pub.len == 32 && secret.len == 32 && basepoint.len == 32, "wrong key sizes")

 	fexpand(bp[:], basepoint[:])

 	cmult(x[:], z[:], secret[:], bp[:])

 	crecip(zmone[:], z[:])