Explicitly test against NULL; do not use !p or similar

[openssl.git] / crypto / asn1 / x_bignum.c

diff --git a/crypto/asn1/x_bignum.c b/crypto/asn1/x_bignum.c
index da57e77a7aa829f0671c4c03fbb02a39e74a9aee..3ae58a49f0b25f76644a8dfb4383c3775b08b1e5 100644 (file)
--- a/crypto/asn1/x_bignum.c
+++ b/crypto/asn1/x_bignum.c
@@ -1,7 +1,7 @@
 /*
  * Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.
  *
- * Licensed under the OpenSSL license (the "License").  You may not use
+ * Licensed under the Apache License 2.0 (the "License").  You may not use
  * this file except in compliance with the License.  You can obtain a copy
  * in the file LICENSE in the source distribution or at
  * https://www.openssl.org/source/license.html
@@ -25,13 +25,13 @@ static int bn_new(ASN1_VALUE **pval, const ASN1_ITEM *it);
 static int bn_secure_new(ASN1_VALUE **pval, const ASN1_ITEM *it);
 static void bn_free(ASN1_VALUE **pval, const ASN1_ITEM *it);
 
-static int bn_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype,
+static int bn_i2c(const ASN1_VALUE **pval, unsigned char *cont, int *putype,
                   const ASN1_ITEM *it);
 static int bn_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,
                   int utype, char *free_cont, const ASN1_ITEM *it);
 static int bn_secure_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,
                          int utype, char *free_cont, const ASN1_ITEM *it);
-static int bn_print(BIO *out, ASN1_VALUE **pval, const ASN1_ITEM *it,
+static int bn_print(BIO *out, const ASN1_VALUE **pval, const ASN1_ITEM *it,
                     int indent, const ASN1_PCTX *pctx);
 
 static ASN1_PRIMITIVE_FUNCS bignum_pf = {
@@ -82,7 +82,7 @@ static int bn_secure_new(ASN1_VALUE **pval, const ASN1_ITEM *it)
 
 static void bn_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
 {
-    if (!*pval)
+    if (*pval == NULL)
         return;
     if (it->size & BN_SENSITIVE)
         BN_clear_free((BIGNUM *)*pval);
@@ -91,12 +91,12 @@ static void bn_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
     *pval = NULL;
 }
 
-static int bn_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype,
+static int bn_i2c(const ASN1_VALUE **pval, unsigned char *cont, int *putype,
                   const ASN1_ITEM *it)
 {
     BIGNUM *bn;
     int pad;
-    if (!*pval)
+    if (*pval == NULL)
         return -1;
     bn = (BIGNUM *)*pval;
     /* If MSB set in an octet we need a padding byte */
@@ -130,12 +130,23 @@ static int bn_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,
 static int bn_secure_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,
                          int utype, char *free_cont, const ASN1_ITEM *it)
 {
-    if (!*pval)
-        bn_secure_new(pval, it);
-    return bn_c2i(pval, cont, len, utype, free_cont, it);
+    int ret;
+    BIGNUM *bn;
+
+    if (*pval == NULL && !bn_secure_new(pval, it))
+        return 0;
+
+    ret = bn_c2i(pval, cont, len, utype, free_cont, it);
+    if (!ret)
+        return 0;
+
+    /* Set constant-time flag for all secure BIGNUMS */
+    bn = (BIGNUM *)*pval;
+    BN_set_flags(bn, BN_FLG_CONSTTIME);
+    return ret;
 }
 
-static int bn_print(BIO *out, ASN1_VALUE **pval, const ASN1_ITEM *it,
+static int bn_print(BIO *out, const ASN1_VALUE **pval, const ASN1_ITEM *it,
                     int indent, const ASN1_PCTX *pctx)
 {
     if (!BN_print(out, *(BIGNUM **)pval))