Change bn_expand()/bn_wexpand() to indicate failure/success via 0/1.

Currently bn_expand()/bn_wexpand() return a BIGNUM *, however none of the
callers use this (and many already treat it as a true/false value).
Change these functions to return 0 on failure and 1 on success, revising
callers that test against NULL in the process.

ok tb@

3 files changed, 16 insertions, 16 deletions

diff --git a/lib/libcrypto/ec/ec2_smpl.c b/lib/libcrypto/ec/ec2_smpl.c
index b6c06a45a20..b4d7f5db2e8 100644
--- a/lib/libcrypto/ec/ec2_smpl.c
+++ b/lib/libcrypto/ec/ec2_smpl.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: ec2_smpl.c,v 1.26 2022/11/24 01:24:37 jsing Exp $ */
+/* $OpenBSD: ec2_smpl.c,v 1.27 2022/11/24 01:30:01 jsing Exp $ */
 /* ====================================================================
  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
  *
@@ -186,9 +186,9 @@ ec_GF2m_simple_group_copy(EC_GROUP *dest, const EC_GROUP *src)
 	dest->poly[3] = src->poly[3];
 	dest->poly[4] = src->poly[4];
 	dest->poly[5] = src->poly[5];
-	if (bn_expand(&dest->a, dest->poly[0]) == NULL)
+	if (!bn_expand(&dest->a, dest->poly[0]))
 		return 0;
-	if (bn_expand(&dest->b, dest->poly[0]) == NULL)
+	if (!bn_expand(&dest->b, dest->poly[0]))
 		return 0;
 	for (i = dest->a.top; i < dest->a.dmax; i++)
 		dest->a.d[i] = 0;
@@ -216,7 +216,7 @@ ec_GF2m_simple_group_set_curve(EC_GROUP *group,
 	/* group->a */
 	if (!BN_GF2m_mod_arr(&group->a, a, group->poly))
 		goto err;
-	if (bn_expand(&group->a, group->poly[0]) == NULL)
+	if (!bn_expand(&group->a, group->poly[0]))
 		goto err;
 	for (i = group->a.top; i < group->a.dmax; i++)
 		group->a.d[i] = 0;
@@ -224,7 +224,7 @@ ec_GF2m_simple_group_set_curve(EC_GROUP *group,
 	/* group->b */
 	if (!BN_GF2m_mod_arr(&group->b, b, group->poly))
 		goto err;
-	if (bn_expand(&group->b, group->poly[0]) == NULL)
+	if (!bn_expand(&group->b, group->poly[0]))
 		goto err;
 	for (i = group->b.top; i < group->b.dmax; i++)
 		group->b.d[i] = 0;
diff --git a/lib/libcrypto/ec/ecp_nistz256.c b/lib/libcrypto/ec/ecp_nistz256.c
index e4929b92bbb..e3a6cc855a7 100644
--- a/lib/libcrypto/ec/ecp_nistz256.c
+++ b/lib/libcrypto/ec/ecp_nistz256.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: ecp_nistz256.c,v 1.12 2022/11/19 07:00:57 tb Exp $	*/
+/*	$OpenBSD: ecp_nistz256.c,v 1.13 2022/11/24 01:30:01 jsing Exp $	*/
 /* Copyright (c) 2014, Intel Corporation.
  *
  * Permission to use, copy, modify, and/or distribute this software for any
@@ -310,7 +310,7 @@ is_one(const BIGNUM *z)
 static int
 ecp_nistz256_set_words(BIGNUM *a, BN_ULONG words[P256_LIMBS])
 {
-	if (bn_wexpand(a, P256_LIMBS) == NULL) {
+	if (!bn_wexpand(a, P256_LIMBS)) {
 		ECerror(ERR_R_MALLOC_FAILURE);
 		return 0;
 	}
diff --git a/lib/libcrypto/ec/ecp_smpl.c b/lib/libcrypto/ec/ecp_smpl.c
index 55fb46869db..71d403b8548 100644
--- a/lib/libcrypto/ec/ecp_smpl.c
+++ b/lib/libcrypto/ec/ecp_smpl.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: ecp_smpl.c,v 1.36 2022/11/19 07:29:29 tb Exp $ */
+/* $OpenBSD: ecp_smpl.c,v 1.37 2022/11/24 01:30:01 jsing Exp $ */
 /* Includes code written by Lenka Fibikova <fibikova@exp-math.uni-essen.de>
  * for the OpenSSL project.
  * Includes code written by Bodo Moeller for the OpenSSL project.
@@ -1556,8 +1556,8 @@ ec_GFp_simple_mul_ct(const EC_GROUP *group, EC_POINT *r, const BIGNUM *scalar,
 	 */
 	cardinality_bits = BN_num_bits(cardinality);
 	group_top = cardinality->top;
-	if ((bn_wexpand(k, group_top + 2) == NULL) ||
-	    (bn_wexpand(lambda, group_top + 2) == NULL))
+	if (!bn_wexpand(k, group_top + 2) ||
+	    !bn_wexpand(lambda, group_top + 2))
 		goto err;
 
 	if (!BN_copy(k, scalar))
@@ -1588,12 +1588,12 @@ ec_GFp_simple_mul_ct(const EC_GROUP *group, EC_POINT *r, const BIGNUM *scalar,
 		goto err;
 
 	group_top = group->field.top;
-	if ((bn_wexpand(&s->X, group_top) == NULL) ||
-	    (bn_wexpand(&s->Y, group_top) == NULL) ||
-	    (bn_wexpand(&s->Z, group_top) == NULL) ||
-	    (bn_wexpand(&r->X, group_top) == NULL) ||
-	    (bn_wexpand(&r->Y, group_top) == NULL) ||
-	    (bn_wexpand(&r->Z, group_top) == NULL))
+	if (!bn_wexpand(&s->X, group_top) ||
+	    !bn_wexpand(&s->Y, group_top) ||
+	    !bn_wexpand(&s->Z, group_top) ||
+	    !bn_wexpand(&r->X, group_top) ||
+	    !bn_wexpand(&r->Y, group_top) ||
+	    !bn_wexpand(&r->Z, group_top))
 		goto err;
 
 	/*