tls: code shrink

function                                             old     new   delta
static.f25519_one                                     32       -     -32
curve25519                                           835     802     -33
------------------------------------------------------------------------------
(add/remove: 0/1 grow/shrink: 0/1 up/down: 0/-65)             Total: -65 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

diff --git a/networking/tls_fe.c b/networking/tls_fe.c
index 37fea34f727309b11f95e00955afec99fa20ff73..dcb41468af75326deb829005bb82a4d542248857 100644 (file)
--- a/networking/tls_fe.c
+++ b/networking/tls_fe.c
@@ -556,19 +556,29 @@ static void xc_double(byte *x3, byte *z3,
 
 void curve25519(byte *result, const byte *e, const byte *q)
 {
-       /* from wolfssl-3.15.3/wolfssl/wolfcrypt/fe_operations.h */
-       static const byte f25519_one[F25519_SIZE] = {1};
-
-       /* Current point: P_m */
-       byte xm[F25519_SIZE];
-       byte zm[F25519_SIZE] = {1};
-
-       /* Predecessor: P_(m-1) */
-       byte xm1[F25519_SIZE] = {1};
-       byte zm1[F25519_SIZE] = {0};
-
        int i;
 
+       struct {
+               /* from wolfssl-3.15.3/wolfssl/wolfcrypt/fe_operations.h */
+               /*static const*/ byte f25519_one[F25519_SIZE]; // = {1};
+
+               /* Current point: P_m */
+               byte xm[F25519_SIZE];
+               byte zm[F25519_SIZE]; // = {1};
+               /* Predecessor: P_(m-1) */
+               byte xm1[F25519_SIZE]; // = {1};
+               byte zm1[F25519_SIZE]; // = {0};
+       } z;
+#define f25519_one z.f25519_one
+#define xm         z.xm
+#define zm         z.zm
+#define xm1        z.xm1
+#define zm1        z.zm1
+       memset(&z, 0, sizeof(z));
+       f25519_one[0] = 1;
+       zm[0] = 1;
+       xm1[0] = 1;
+
        /* Note: bit 254 is assumed to be 1 */
        lm_copy(xm, q);