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tls: code shrink

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function                                             old     new   delta
lm_add                                                82      78      -4
curve25519                                           793     786      -7
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/2 up/down: 0/-11)             Total: -11 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2019-01-10 20:18:02 +01:00
parent 6ca8e347fe
commit 3109d1f965
1 changed files with 7 additions and 11 deletions
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18
networking/tls_fe.c
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@ -43,17 +43,13 @@ typedef uint32_t word32;
#if 0 //UNUSED #if 0 //UNUSED
static void fprime_copy(byte *x, const byte *a) static void fprime_copy(byte *x, const byte *a)
{ {
int i; memcpy(x, a, F25519_SIZE);
for (i = 0; i < F25519_SIZE; i++)
x[i] = a[i];
} }
#endif #endif
static void lm_copy(byte* x, const byte* a) static void lm_copy(byte* x, const byte* a)
{ {
int i; memcpy(x, a, F25519_SIZE);
for (i = 0; i < F25519_SIZE; i++)
x[i] = a[i];
} }
#if 0 //UNUSED #if 0 //UNUSED
@ -200,7 +196,7 @@ static void fe_load(byte *x, word32 c)
static void fe_normalize(byte *x) static void fe_normalize(byte *x)
{ {
byte minusp[F25519_SIZE]; byte minusp[F25519_SIZE];
word16 c; unsigned c;
int i; int i;
/* Reduce using 2^255 = 19 mod p */ /* Reduce using 2^255 = 19 mod p */
@ -219,13 +215,13 @@ static void fe_normalize(byte *x)
*/ */
c = 19; c = 19;
for (i = 0; i + 1 < F25519_SIZE; i++) { for (i = 0; i < F25519_SIZE - 1; i++) {
c += x[i]; c += x[i];
minusp[i] = (byte)c; minusp[i] = (byte)c;
c >>= 8; c >>= 8;
} }
c += ((word16)x[i]) - 128; c += ((unsigned)x[i]) - 128;
minusp[31] = (byte)c; minusp[31] = (byte)c;
/* Load x-p if no underflow */ /* Load x-p if no underflow */
@ -234,13 +230,13 @@ static void fe_normalize(byte *x)
static void lm_add(byte* r, const byte* a, const byte* b) static void lm_add(byte* r, const byte* a, const byte* b)
{ {
word16 c = 0; unsigned c = 0;
int i; int i;
/* Add */ /* Add */
for (i = 0; i < F25519_SIZE; i++) { for (i = 0; i < F25519_SIZE; i++) {
c >>= 8; c >>= 8;
c += ((word16)a[i]) + ((word16)b[i]); c += ((unsigned)a[i]) + ((unsigned)b[i]);
r[i] = (byte)c; r[i] = (byte)c;
} }