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tls: P256: pad struct sp_point to 64 bits (on 64-bit arches)

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function                                             old     new   delta
curve_P256_compute_pubkey_and_premaster              198     190      -8

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
2021-11-28 02:56:02 +01:00
parent 0b13ab66f4
commit 1b93c7c4ec
1 changed files with 9 additions and 5 deletions
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14
networking/tls_sp_c32.c
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@@ -49,14 +49,19 @@ typedef int32_t signed_sp_digit;
*/ */
typedef struct sp_point { 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 y[8];
sp_digit z[8]; sp_digit z[8];
int infinity; int infinity;
} sp_point; } sp_point;
/* The modulus (prime) of the curve P256. */ /* 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, 0xffffffff,0xffffffff,0xffffffff,0x00000000,
0x00000000,0x00000000,0x00000001,0xffffffff, 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. * a First number to multiply in Montogmery form.
* b Second number to multiply in Montogmery form. * b Second number to multiply in Montogmery form.
* m Modulus (prime). * 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 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*/) /*, 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. * r Result of squaring.
* a Number to square in Montogmery form. * a Number to square in Montogmery form.
* m Modulus (prime). * m Modulus (prime).
* mp Montogmery mulitplier. * mp Montogmery multiplier.
*/ */
static void sp_256_mont_sqr_8(sp_digit* r, const sp_digit* a static void sp_256_mont_sqr_8(sp_digit* r, const sp_digit* a
/*, const sp_digit* m, sp_digit mp*/) /*, 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; return;
} }
if (p->infinity || q->infinity) { if (p->infinity || q->infinity) {
*r = p->infinity ? *q : *p; /* struct copy */ *r = p->infinity ? *q : *p; /* struct copy */
return; return;