Prepare for assembly ecc_25519_modp.

ChangeLog

+2014-08-22  Niels Möller  <nisse@lysator.liu.se>
+
+	* ecc-25519.c [HAVE_NATIVE_ecc_25519_modp]: Use assembly version
+	if available.
+
+	* configure.ac (asm_hogweed_optional_list): Added ecc-25519-modp.asm.
+	Also add HAVE_NATIVE_ecc_25519_modp to config.h.in.
+
 2014-08-19  Niels Möller  <nisse@lysator.liu.se>
 
 	* examples/ecc-benchmark.c (bench_curve): Support benchmarking of

configure.ac

@@ -285,7 +285,7 @@ asm_nettle_optional_list="gcm-hash8.asm"
 asm_hogweed_optional_list=""
 if test "x$enable_public_key" = "xyes" ; then
   asm_hogweed_optional_list="ecc-192-modp.asm ecc-224-modp.asm \
-    ecc-256-redc.asm ecc-384-modp.asm ecc-521-modp.asm"
+    ecc-25519-modp.asm ecc-256-redc.asm ecc-384-modp.asm ecc-521-modp.asm"
 fi
 
 OPT_ASM_NETTLE_SOURCES=""
@@ -365,6 +365,7 @@ AH_VERBATIM([HAVE_NATIVE],
 #undef HAVE_NATIVE_ecc_192_redc
 #undef HAVE_NATIVE_ecc_224_modp
 #undef HAVE_NATIVE_ecc_224_redc
+#undef HAVE_NATIVE_ecc_25519_modp
 #undef HAVE_NATIVE_ecc_256_modp
 #undef HAVE_NATIVE_ecc_256_redc
 #undef HAVE_NATIVE_ecc_384_modp

ecc-25519.c

@@ -41,6 +41,13 @@
 
 #include "ecc-25519.h"
 
+#if HAVE_NATIVE_ecc_25519_modp
+
+#define ecc_25519_modp nettle_ecc_25519_modp
+void
+ecc_25519_modp (const struct ecc_curve *ecc, mp_limb_t *rp);
+#else
+
 #define HIGH_BITS (GMP_NUMB_BITS * ECC_LIMB_SIZE - 255)
 
 #if HIGH_BITS == 0
@@ -60,6 +67,8 @@ ecc_25519_modp(const struct ecc_curve *ecc UNUSED, mp_limb_t *rp)
     + sec_add_1 (rp, rp, ECC_LIMB_SIZE - 1, 19 * cy);
 }
 
+#endif /* HAVE_NATIVE_ecc_25519_modp */
+
 /* Needs 2*ecc->size limbs at rp, and 2*ecc->size additional limbs of
    scratch space. No overlap allowed. */
 static void