ec-field-test.c: Make the field-element type use internal format.

[secnet] / NOTES

diff --git a/NOTES b/NOTES
index f5ebc65..313a0ff 100644 (file)
--- a/NOTES
+++ b/NOTES
@@ -218,8 +218,24 @@ Capability flag bits must be in one the following two categories:
    applicable.  They may also appear in MSG1, but this is not
    guaranteed.  MSG4 must advertise the same set as MSG2.
 
    applicable.  They may also appear in MSG1, but this is not
    guaranteed.  MSG4 must advertise the same set as MSG2.
 

-No capability flags are currently defined.  Unknown capability flags
-should be treated as late ones.
+Capability bits 8 to 31 are used by Secnet as default capability numbers
+for various features: bit 8 is for the original CBCMAC-based transform,
+and bit 9 for the new EAX transform; bit 10 for traditional finite-field
+Diffie--Hellman; bits 11 to 14 and 16 to 30 are reserved for future
+expansion.  The the low eight bits are reserved for local use, e.g., to
+allow migration from one set of parameters for a particular transform to
+a different, incompatible set of parameters for the same transform. Bit
+31, if advertised by both ends, indicates that a mobile end gets
+priority in case of crossed MSG1.
+
+Bit 15 is special: it signifies (a) that the sender is reporting all of
+its transforms and DH groups explicitly, and (b) that it uses all 32
+capability bits to do so.  Older Secnets only checked the low 16 bits
+for known capabilities.
+
+Whether a capability number is early depends on its meaning, rather than
+being a static property of its number.  That said, the mobile-end-gets
+priority bit (31) is always sent as an `early' capability bit.

 
 
 MTU handling
 
 
 MTU handling


@@ -263,7 +279,7 @@ negotiated or assumed).
 
 Messages:
 
 
 Messages:
 

-1) A->B: *,iA,msg1,A+,B+,nA
+1) A->B: i*,iA,msg1,A+,B+,nA

 
 i* must be encoded as 0.  (However, it is permitted for a site to use
 zero as its "index" for another site.)
 
 i* must be encoded as 0.  (However, it is permitted for a site to use
 zero as its "index" for another site.)