Add assembler code for the nist 256-bit GFp curve, written initially by

Intel. Obtained from BoringSSL, with some integration work borrowed from
OpenSSL 1.0.2; assembler code for arm and sparc64 borrowed from OpenSSL 1.1.0.

None of this code is enabled in libcrypto yet.

ok beck@ jsing@

1 files changed, 8 insertions, 4 deletions

diff --git a/src/lib/libcrypto/ec/ec_curve.c b/src/lib/libcrypto/ec/ec_curve.c
index f852ccaee3..c8eee285b6 100644
--- a/src/lib/libcrypto/ec/ec_curve.c
+++ b/src/lib/libcrypto/ec/ec_curve.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: ec_curve.c,v 1.13 2016/03/10 23:21:46 mmcc Exp $ */
+/* $OpenBSD: ec_curve.c,v 1.14 2016/11/04 17:33:19 miod Exp $ */
 /*
  * Written by Nils Larsch for the OpenSSL project.
  */
@@ -3050,11 +3050,15 @@ static const ec_list_element curve_list[] = {
         {NID_X9_62_prime239v1, &_EC_X9_62_PRIME_239V1.h, 0, "X9.62 curve over a 239 bit prime field"},
         {NID_X9_62_prime239v2, &_EC_X9_62_PRIME_239V2.h, 0, "X9.62 curve over a 239 bit prime field"},
         {NID_X9_62_prime239v3, &_EC_X9_62_PRIME_239V3.h, 0, "X9.62 curve over a 239 bit prime field"},
-#ifndef OPENSSL_NO_EC_NISTP_64_GCC_128
-        {NID_X9_62_prime256v1, &_EC_X9_62_PRIME_256V1.h, EC_GFp_nistp256_method, "X9.62/SECG curve over a 256 bit prime field"},
+        {NID_X9_62_prime256v1, &_EC_X9_62_PRIME_256V1.h,
+#if defined(ECP_NISTZ256_ASM)
+         EC_GFp_nistz256_method,
+#elif !defined(OPENSSL_NO_EC_NISTP_64_GCC_128)
+         EC_GFp_nistp256_method,
 #else
-        {NID_X9_62_prime256v1, &_EC_X9_62_PRIME_256V1.h, 0, "X9.62/SECG curve over a 256 bit prime field"},
+         0,
 #endif
+         "X9.62/SECG curve over a 256 bit prime field"},
 #ifndef OPENSSL_NO_EC2M
         /* characteristic two field curves */
         /* NIST/SECG curves */