Better error code when lacking __SIZEOF_INT128__

[openssl.git] / crypto / ec / ecp_nistp256.c

diff --git a/crypto/ec/ecp_nistp256.c b/crypto/ec/ecp_nistp256.c
index 162f14632958b9a07a69bfd0f8f7b03cdc9b9710..19caa031c8546c300b8ea5cd569d7bda6f4e2d98 100644 (file)
--- a/crypto/ec/ecp_nistp256.c
+++ b/crypto/ec/ecp_nistp256.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
@@ -41,19 +41,18 @@ 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 */
 typedef __int128_t int128_t;
 # 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 uint32_t u32;
 typedef uint64_t u64;
-typedef int64_t s64;
 
 /*
  * The underlying field. P256 operates over GF(2^256-2^224+2^192+2^96-1). We
@@ -165,7 +164,7 @@ static int BN_to_felem(felem out, const BIGNUM *bn)
     /* BN_bn2bin eats leading zeroes */
     memset(b_out, 0, sizeof(b_out));
     num_bytes = BN_num_bytes(bn);
-    if (num_bytes > sizeof b_out) {
+    if (num_bytes > sizeof(b_out)) {
         ECerr(EC_F_BN_TO_FELEM, EC_R_BIGNUM_OUT_OF_RANGE);
         return 0;
     }
@@ -184,8 +183,8 @@ static BIGNUM *smallfelem_to_BN(BIGNUM *out, const smallfelem in)
 {
     felem_bytearray b_in, b_out;
     smallfelem_to_bin32(b_in, in);
-    flip_endian(b_out, b_in, sizeof b_out);
-    return BN_bin2bn(b_out, sizeof b_out, out);
+    flip_endian(b_out, b_in, sizeof(b_out));
+    return BN_bin2bn(b_out, sizeof(b_out), out);
 }
 
 /*-
@@ -394,7 +393,7 @@ static void felem_shrink(smallfelem out, const felem in)
 {
     felem tmp;
     u64 a, b, mask;
-    s64 high, low;
+    u64 high, low;
     static const u64 kPrime3Test = 0x7fffffff00000001ul; /* 2^63 - 2^32 + 1 */
 
     /* Carry 2->3 */
@@ -435,29 +434,31 @@ static void felem_shrink(smallfelem out, const felem in)
      * In order to make space in tmp[3] for the carry from 2 -> 3, we
      * conditionally subtract kPrime if tmp[3] is large enough.
      */
-    high = tmp[3] >> 64;
+    high = (u64)(tmp[3] >> 64);
     /* As tmp[3] < 2^65, high is either 1 or 0 */
-    high <<= 63;
-    high >>= 63;
+    high = 0 - high;
     /*-
      * high is:
      *   all ones   if the high word of tmp[3] is 1
-     *   all zeros  if the high word of tmp[3] if 0 */
-    low = tmp[3];
-    mask = low >> 63;
+     *   all zeros  if the high word of tmp[3] if 0
+     */
+    low = (u64)tmp[3];
+    mask = 0 - (low >> 63);
     /*-
      * mask is:
      *   all ones   if the MSB of low is 1
-     *   all zeros  if the MSB of low if 0 */
+     *   all zeros  if the MSB of low if 0
+     */
     low &= bottom63bits;
     low -= kPrime3Test;
     /* if low was greater than kPrime3Test then the MSB is zero */
     low = ~low;
-    low >>= 63;
+    low = 0 - (low >> 63);
     /*-
      * low is:
      *   all ones   if low was > kPrime3Test
-     *   all zeros  if low was <= kPrime3Test */
+     *   all zeros  if low was <= kPrime3Test
+     */
     mask = (mask & low) | high;
     tmp[0] -= mask & kPrime[0];
     tmp[1] -= mask & kPrime[1];
@@ -891,7 +892,7 @@ static void felem_contract(smallfelem out, const felem in)
         equal &= equal << 4;
         equal &= equal << 2;
         equal &= equal << 1;
-        equal = ((s64) equal) >> 63;
+        equal = 0 - (equal >> 63);
 
         all_equal_so_far &= equal;
     }
@@ -958,7 +959,7 @@ static limb smallfelem_is_zero(const smallfelem small)
     is_zero &= is_zero << 4;
     is_zero &= is_zero << 2;
     is_zero &= is_zero << 1;
-    is_zero = ((s64) is_zero) >> 63;
+    is_zero = 0 - (is_zero >> 63);
 
     is_p = (small[0] ^ kPrime[0]) |
         (small[1] ^ kPrime[1]) |
@@ -970,7 +971,7 @@ static limb smallfelem_is_zero(const smallfelem small)
     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_zero |= is_p;
 
@@ -979,7 +980,7 @@ static limb smallfelem_is_zero(const smallfelem small)
     return result;
 }
 
-static int smallfelem_is_zero_int(const smallfelem small)
+static int smallfelem_is_zero_int(const void *small)
 {
     return (int)(smallfelem_is_zero(small) & ((limb) 1));
 }
@@ -1901,9 +1902,10 @@ int ec_GFp_nistp256_group_set_curve(EC_GROUP *group, const BIGNUM *p,
         if ((ctx = new_ctx = BN_CTX_new()) == NULL)
             return 0;
     BN_CTX_start(ctx);
-    if (((curve_p = BN_CTX_get(ctx)) == NULL) ||
-        ((curve_a = BN_CTX_get(ctx)) == NULL) ||
-        ((curve_b = BN_CTX_get(ctx)) == NULL))
+    curve_p = BN_CTX_get(ctx);
+    curve_a = BN_CTX_get(ctx);
+    curve_b = BN_CTX_get(ctx);
+    if (curve_b == NULL)
         goto err;
     BN_bin2bn(nistp256_curve_params[0], sizeof(felem_bytearray), curve_p);
     BN_bin2bn(nistp256_curve_params[1], sizeof(felem_bytearray), curve_a);
@@ -1983,7 +1985,6 @@ static void make_points_affine(size_t num, smallfelem points[][3],
                                              sizeof(smallfelem),
                                              tmp_smallfelems,
                                              (void (*)(void *))smallfelem_one,
-                                             (int (*)(const void *))
                                              smallfelem_is_zero_int,
                                              (void (*)(void *, const void *))
                                              smallfelem_assign,
@@ -2034,10 +2035,11 @@ int ec_GFp_nistp256_points_mul(const EC_GROUP *group, EC_POINT *r,
         if ((ctx = new_ctx = BN_CTX_new()) == NULL)
             return 0;
     BN_CTX_start(ctx);
-    if (((x = BN_CTX_get(ctx)) == NULL) ||
-        ((y = BN_CTX_get(ctx)) == NULL) ||
-        ((z = BN_CTX_get(ctx)) == NULL) ||
-        ((tmp_scalar = BN_CTX_get(ctx)) == NULL))
+    x = BN_CTX_get(ctx);
+    y = BN_CTX_get(ctx);
+    z = BN_CTX_get(ctx);
+    tmp_scalar = BN_CTX_get(ctx);
+    if (tmp_scalar == NULL)
         goto err;
 
     if (scalar != NULL) {
@@ -2224,7 +2226,9 @@ int ec_GFp_nistp256_precompute_mult(EC_GROUP *group, BN_CTX *ctx)
         if ((ctx = new_ctx = BN_CTX_new()) == NULL)
             return 0;
     BN_CTX_start(ctx);
-    if (((x = BN_CTX_get(ctx)) == NULL) || ((y = BN_CTX_get(ctx)) == NULL))
+    x = BN_CTX_get(ctx);
+    y = BN_CTX_get(ctx);
+    if (y == NULL)
         goto err;
     /* get the generator */
     if (group->generator == NULL)