Better error code when lacking __SIZEOF_INT128__

[openssl.git] / crypto / ec / ecp_nistp521.c

diff --git a/crypto/ec/ecp_nistp521.c b/crypto/ec/ecp_nistp521.c
index 9d264f63d40dfc04131f63f7622001873ebe6c42..3f68ae3c1c62cd7990a290f162578c232184d120 100644 (file)
--- a/crypto/ec/ecp_nistp521.c
+++ b/crypto/ec/ecp_nistp521.c
@@ -1,5 +1,5 @@
 /*
- * Copyright 2011-2016 The OpenSSL Project Authors. All Rights Reserved.
+ * Copyright 2011-2018 The OpenSSL Project Authors. All Rights Reserved.
  *
  * Licensed under the OpenSSL license (the "License").  You may not use
  * this file except in compliance with the License.  You can obtain a copy
@@ -40,17 +40,16 @@ NON_EMPTY_TRANSLATION_UNIT
 # include <openssl/err.h>
 # include "ec_lcl.h"
 
-# if defined(__GNUC__) && (__GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 1))
+# if defined(__SIZEOF_INT128__) && __SIZEOF_INT128__==16
   /* even with gcc, the typedef won't work for 32-bit platforms */
 typedef __uint128_t uint128_t;  /* nonstandard; implemented by gcc on 64-bit
                                  * platforms */
 # else
-#  error "Need GCC 3.1 or later to define type uint128_t"
+#  error "Your compiler doesn't appear to support 128-bit integer types"
 # endif
 
 typedef uint8_t u8;
 typedef uint64_t u64;
-typedef int64_t s64;
 
 /*
  * The underlying field. P521 operates over GF(2^521-1). We can serialise an
@@ -867,7 +866,7 @@ static limb felem_is_zero(const felem in)
      * We know that ftmp[i] < 2^63, therefore the only way that the top bit
      * can be set is if is_zero was 0 before the decrement.
      */
-    is_zero = ((s64) is_zero) >> 63;
+    is_zero = 0 - (is_zero >> 63);
 
     is_p = ftmp[0] ^ kPrime[0];
     is_p |= ftmp[1] ^ kPrime[1];
@@ -880,7 +879,7 @@ static limb felem_is_zero(const felem in)
     is_p |= ftmp[8] ^ kPrime[8];
 
     is_p--;
-    is_p = ((s64) is_p) >> 63;
+    is_p = 0 - (is_p >> 63);
 
     is_zero |= is_p;
     return is_zero;
@@ -951,7 +950,7 @@ static void felem_contract(felem out, const felem in)
     is_p &= is_p << 4;
     is_p &= is_p << 2;
     is_p &= is_p << 1;
-    is_p = ((s64) is_p) >> 63;
+    is_p = 0 - (is_p >> 63);
     is_p = ~is_p;
 
     /* is_p is 0 iff |out| == 2^521-1 and all ones otherwise */
@@ -977,7 +976,7 @@ static void felem_contract(felem out, const felem in)
     is_greater |= is_greater << 4;
     is_greater |= is_greater << 2;
     is_greater |= is_greater << 1;
-    is_greater = ((s64) is_greater) >> 63;
+    is_greater = 0 - (is_greater >> 63);
 
     out[0] -= kPrime[0] & is_greater;
     out[1] -= kPrime[1] & is_greater;