X-Git-Url: https://www.bearssl.org/gitweb//home/git/?p=BearSSL;a=blobdiff_plain;f=src%2Fint%2Fi15_add.c;fp=src%2Fec%2Fec_prime_i31_secp256r1.c;h=97e29b825f54331aba0d0ca786b8f187d0c9287c;hp=007b6b26bfc8067fd5066477475ea9c6c4f8a3b1;hb=2f454aad577ae53798935cc32438a2d3f02ba31f;hpb=bd3036844bd20b2b8d7bce7fee5ad010ce401915

diff --git a/src/ec/ec_prime_i31_secp256r1.c b/src/int/i15_add.c
similarity index 70%
rename from src/ec/ec_prime_i31_secp256r1.c
rename to src/int/i15_add.c
index 007b6b2..97e29b8 100644
--- a/src/ec/ec_prime_i31_secp256r1.c
+++ b/src/int/i15_add.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016 Thomas Pornin <pornin@bolet.org>
+ * Copyright (c) 2017 Thomas Pornin <pornin@bolet.org>
  *
  * Permission is hereby granted, free of charge, to any person obtaining 
  * a copy of this software and associated documentation files (the
@@ -24,23 +24,23 @@
 
 #include "inner.h"
 
-static const uint32_t P256_P[] = {
-	0x00000108,
-	0x7FFFFFFF, 0x7FFFFFFF, 0x7FFFFFFF, 0x00000007,
-	0x00000000, 0x00000000, 0x00000040, 0x7FFFFF80,
-	0x000000FF
-};
+/* see inner.h */
+uint32_t
+br_i15_add(uint16_t *a, const uint16_t *b, uint32_t ctl)
+{
+	uint32_t cc;
+	size_t u, m;
 
-static const uint32_t P256_B[] = {
-	0x00000108,
-	0x6FEE1803, 0x6229C4BD, 0x21B139BE, 0x327150AA,
-	0x3567802E, 0x3F7212ED, 0x012E4355, 0x782DD38D,
-	0x0000000E
-};
+	cc = 0;
+	m = (a[0] + 31) >> 4;
+	for (u = 1; u < m; u ++) {
+		uint32_t aw, bw, naw;
 
-/* see inner.h */
-const br_ec_prime_i31_curve br_ec_prime_i31_secp256r1 = {
-	P256_P,
-	P256_B,
-	0x00000001
-};
+		aw = a[u];
+		bw = b[u];
+		naw = aw + bw + cc;
+		cc = naw >> 15;
+		a[u] = MUX(ctl, naw & 0x7FFF, aw);
+	}
+	return cc;
+}