X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ian/git?p=secnet.git;a=blobdiff_plain;f=magic.h;h=598a79e1a681acffa661f886283b35f0785c0fff;hp=c2503a0c19ca30d2e09cd68cec32dcbd12f7bd8d;hb=328ae477c72b63616f28de2ff3ead9bf8d4752ba;hpb=136740e64e3fedcd725490c2f80d0906de515197

diff --git a/magic.h b/magic.h
index c2503a0..598a79e 100644
--- a/magic.h
+++ b/magic.h
@@ -3,16 +3,47 @@
 #ifndef magic_h
 #define magic_h
 
-#define LABEL_NAK  0x00000000
-#define LABEL_MSG0 0x00020200
-#define LABEL_MSG1 0x01010101
-#define LABEL_MSG2 0x02020202
-#define LABEL_MSG3 0x03030303
-#define LABEL_MSG4 0x04040404
-#define LABEL_MSG5 0x05050505
-#define LABEL_MSG6 0x06060606
-#define LABEL_MSG7 0x07070707
-#define LABEL_MSG8 0x08080808
-#define LABEL_MSG9 0x09090909
+#define LABEL_NAK     0x00000000
+#define LABEL_MSG0    0x00020200
+#define LABEL_MSG1    0x01010101
+#define LABEL_MSG2    0x02020202
+#define LABEL_MSG3    0x03030303
+#define LABEL_MSG3BIS 0x13030313
+#define LABEL_MSG4    0x04040404
+#define LABEL_MSG5    0x05050505
+#define LABEL_MSG6    0x06060606
+#define LABEL_MSG7    0x07070707
+#define LABEL_MSG8    0x08080808
+#define LABEL_MSG9    0x09090909
+#define LABEL_PROD    0x0a0a0a0a
+
+/* uses of the 32-bit capability bitmap */
+#define CAPAB_EARLY           0x00000000 /* no Early flags yet (see NOTES) */
+#define CAPAB_TRANSFORM_MASK  0x0000ffff
+/* remaining 16 bits are unused */
+
+/*
+ * The transform capability mask is a set of bits, one for each
+ * transform supported.  The transform capability numbers are set in
+ * the configuration (and should correspond between the two sites),
+ * although there are sensible defaults.
+ *
+ * Advertising a nonzero transform capability mask promises that
+ * the receiver understands LABEL_MSG3BIS messages, which
+ * contain an additional byte specifying the transform capability
+ * number actually chosen by the MSG3 sender.
+ *
+ * Aside from that, an empty bitmask is treated the same as
+ *  1u<<CAPAB_TRANSFORMNUM_ANCIENT
+ */
+
+/* bit indices, 0 is ls bit */
+#define CAPAB_TRANSFORMNUM_USER_MIN              0
+#define CAPAB_TRANSFORMNUM_USER_MAX              7
+#define CAPAB_TRANSFORMNUM_SERPENT256CBC         8
+#define CAPAB_TRANSFORMNUM_EAXSERPENT            9
+#define CAPAB_TRANSFORMNUM_MAX                  15
+
+#define CAPAB_TRANSFORMNUM_ANCIENT CAPAB_TRANSFORMNUM_SERPENT256CBC
 
 #endif /* magic_h */