New struct ecc_curve constant, edwards_root.

ChangeLog

 2014-07-11  Niels Möller  <nisse@lysator.liu.se>
 
+	* ecc-internal.h (struct ecc_curve): New constant edwards_root.
+	* ecc-192.c (nettle_secp_192r1): Updated accordingly, additional
+	NULL pointer.
+	* ecc-224.c (nettle_secp_224r1): Likewise.
+	* ecc-256.c (nettle_secp_256r1): Likewise.
+	* ecc-384.c (nettle_secp_384r1): Likewise.
+	* ecc-521.c (nettle_secp_521r1): Likewise.
+	* ecc-25519.c (nettle_curve25519): Initialize new constant.
+
 	* eccdata.c (ecc_curve_init): For curve 25519, use correct
 	constant for edwards coordinate transform, and output the constant
 	as ecc_edwards.

ecc-192.c

@@ -122,6 +122,7 @@ const struct ecc_curve nettle_secp_192r1 =
   ecc_q,
   ecc_g,
   ecc_redc_g,
+  NULL,
   ecc_192_modp,
   ecc_generic_redc,
   ecc_192_modp,

ecc-224.c

@@ -68,6 +68,7 @@ const struct ecc_curve nettle_secp_224r1 =
   ecc_q,
   ecc_g,
   ecc_redc_g,
+  NULL,
   ecc_224_modp,
   ecc_generic_redc,
   USE_REDC ? ecc_generic_redc : ecc_224_modp,

ecc-25519.c

@@ -75,6 +75,7 @@ const struct ecc_curve nettle_curve25519 =
   ecc_q,
   ecc_g,
   ecc_redc_g,
+  ecc_edwards,
   ecc_25519_modp,
   NULL,
   ecc_25519_modp,

ecc-256.c

@@ -233,6 +233,7 @@ const struct ecc_curve nettle_secp_256r1 =
   ecc_q,
   ecc_g,
   ecc_redc_g,
+  NULL,
   ecc_256_modp,
   ecc_256_redc,
   USE_REDC ? ecc_256_redc : ecc_256_modp,

ecc-384.c

@@ -161,6 +161,7 @@ const struct ecc_curve nettle_secp_384r1 =
   ecc_q,
   ecc_g,
   ecc_redc_g,
+  NULL,
   ecc_384_modp,
   ECC_REDC_SIZE != 0 ? ecc_generic_redc : NULL,
   ecc_384_modp,

ecc-521.c

@@ -89,6 +89,7 @@ const struct ecc_curve nettle_secp_521r1 =
   ecc_q,
   ecc_g,
   ecc_redc_g,
+  NULL,
   ecc_521_modp,
   ecc_generic_redc,
   ecc_521_modp,

ecc-internal.h

@@ -107,6 +107,9 @@ struct ecc_curve
   const mp_limb_t *g;
   /* Generator with coordinates in Montgomery form. */
   const mp_limb_t *redc_g;
+  /* If non-NULL, the constant needed for transformation to the
+     equivalent Edwards curve. */
+  const mp_limb_t *edwards_root;
 
   ecc_mod_func *modp;
   ecc_mod_func *redc;