Add documentation
Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
diff --git a/library/ecp_curves.c b/library/ecp_curves.c
index e1e3537..54fd26b 100644
--- a/library/ecp_curves.c
+++ b/library/ecp_curves.c
@@ -5077,20 +5077,20 @@
RESET;
- SUB_LAST; NEXT; // A0
+ /* Use 2^224 = P + 2^96 - 1 to modulo reduce the final carry */
+ SUB_LAST; NEXT; // A0 += -last_c
NEXT; // A1
NEXT; // A2
- ADD_LAST; NEXT; // A3
+ ADD_LAST; NEXT; // A3 += last_c
NEXT; // A4
NEXT; // A5
// A6
-
RESET;
- SUB_LAST; NEXT; // A0
+ SUB_LAST; NEXT; // A0 += -last_c
NEXT; // A1
NEXT; // A2
- ADD_LAST; NEXT; // A3
+ ADD_LAST; NEXT; // A3 += last_c
NEXT; // A4
NEXT; // A5
// A6