[git commit] tls: P256: pad struct sp_point to 64 bits (on 64-bit arches)

[Denys Vlasenko]

commit: https://git.busybox.net/busybox/commit/?id=1b93c7c4ecc47318905b6e6f801732b7dd31e0ee
branch: https://git.busybox.net/busybox/commit/?id=refs/heads/master

function                                             old     new   delta
curve_P256_compute_pubkey_and_premaster              198     190      -8

Signed-off-by: Denys Vlasenko <vda.linux at googlemail.com>
---
 networking/tls_sp_c32.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/networking/tls_sp_c32.c b/networking/tls_sp_c32.c
index 4c8f08d4e..37e1cfa1c 100644
--- a/networking/tls_sp_c32.c
+++ b/networking/tls_sp_c32.c
@@ -49,14 +49,19 @@ typedef int32_t signed_sp_digit;
  */
 
 typedef struct sp_point {
-	sp_digit x[8];
+	sp_digit x[8]
+#if ULONG_MAX > 0xffffffff
+		/* Make sp_point[] arrays to not be 64-bit misaligned */
+		ALIGNED(8)
+#endif
+	;
 	sp_digit y[8];
 	sp_digit z[8];
 	int infinity;
 } sp_point;
 
 /* The modulus (prime) of the curve P256. */
-static const sp_digit p256_mod[8] = {
+static const sp_digit p256_mod[8] ALIGNED(8) = {
 	0xffffffff,0xffffffff,0xffffffff,0x00000000,
 	0x00000000,0x00000000,0x00000001,0xffffffff,
 };
@@ -903,7 +908,7 @@ static void sp_512to256_mont_reduce_8(sp_digit* r, sp_digit* a/*, const sp_digit
  * a   First number to multiply in Montogmery form.
  * b   Second number to multiply in Montogmery form.
  * m   Modulus (prime).
- * mp  Montogmery mulitplier.
+ * mp  Montogmery multiplier.
  */
 static void sp_256_mont_mul_8(sp_digit* r, const sp_digit* a, const sp_digit* b
 		/*, const sp_digit* m, sp_digit mp*/)
@@ -920,7 +925,7 @@ static void sp_256_mont_mul_8(sp_digit* r, const sp_digit* a, const sp_digit* b
  * r   Result of squaring.
  * a   Number to square in Montogmery form.
  * m   Modulus (prime).
- * mp  Montogmery mulitplier.
+ * mp  Montogmery multiplier.
  */
 static void sp_256_mont_sqr_8(sp_digit* r, const sp_digit* a
 		/*, const sp_digit* m, sp_digit mp*/)
@@ -1145,7 +1150,6 @@ static NOINLINE void sp_256_proj_point_add_8(sp_point* r, sp_point* p, sp_point*
 		return;
 	}
 
-
 	if (p->infinity || q->infinity) {
 		*r = p->infinity ? *q : *p; /* struct copy */
 		return;