Call RSA_blinding_on(), as advised in the paper on

http://crypto.stanford.edu/~dabo/abstracts/ssl-timing.html
to offer some resistance against timing attacks.

diff --git a/src/net_setup.c b/src/net_setup.c
index acb156c..0eef428 100644 (file)
--- a/src/net_setup.c
+++ b/src/net_setup.c
@@ -17,7 +17,7 @@
     along with this program; if not, write to the Free Software
     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 
-    $Id: net_setup.c,v 1.1.2.28 2003/01/14 12:53:59 guus Exp $
+    $Id: net_setup.c,v 1.1.2.29 2003/03/14 09:43:10 zarq Exp $
 */
 
 #include "config.h"
@@ -85,8 +85,10 @@ int read_rsa_public_key(connection_t *c)
 
        cp();
 
-       if(!c->rsa_key)
+       if(!c->rsa_key) {
                c->rsa_key = RSA_new();
+               RSA_blinding_on(c->rsa_key, NULL);
+       }
 
        /* First, check for simple PublicKey statement */
 
@@ -132,8 +134,10 @@ int read_rsa_public_key(connection_t *c)
                        c->rsa_key = PEM_read_RSA_PUBKEY(fp, &c->rsa_key, NULL, NULL);
                        fclose(fp);
 
-                       if(c->rsa_key)
+                       if(c->rsa_key) {
+                               RSA_blinding_on(c->rsa_key, NULL);
                                return 0;
+                       }
 
                        syslog(LOG_ERR, _("Reading RSA public key file `%s' failed: %s"),
                                   fname, strerror(errno));
@@ -166,6 +170,7 @@ int read_rsa_public_key(connection_t *c)
 
        if(fp) {
                c->rsa_key = PEM_read_RSA_PUBKEY(fp, &c->rsa_key, NULL, NULL);
+               RSA_blinding_on(c->rsa_key, NULL);
                fclose(fp);
        }
 
@@ -188,6 +193,7 @@ int read_rsa_private_key(void)
 
        if(get_config_string(lookup_config(config_tree, "PrivateKey"), &key)) {
                myself->connection->rsa_key = RSA_new();
+               RSA_blinding_on(myself->connection->rsa_key, NULL);
                BN_hex2bn(&myself->connection->rsa_key->d, key);
                BN_hex2bn(&myself->connection->rsa_key->e, "FFFF");
                free(key);