[crypto/ec] don't assume points are of order group->order

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

diff --git a/crypto/ec/ecdsa_vrf.c b/crypto/ec/ecdsa_vrf.c
index a62b999bb994bee6d08a4da2b07e6f23113ef210..f61a20063e4b51e2599cefdfbd1598b835df7168 100644 (file)
--- a/crypto/ec/ecdsa_vrf.c
+++ b/crypto/ec/ecdsa_vrf.c
@@ -1,67 +1,14 @@
-/* crypto/ecdsa/ecdsa_vrf.c */
 /*
- * Written by Nils Larsch for the OpenSSL project
- */
-/* ====================================================================
- * Copyright (c) 1998-2002 The OpenSSL Project.  All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in
- *    the documentation and/or other materials provided with the
- *    distribution.
- *
- * 3. All advertising materials mentioning features or use of this
- *    software must display the following acknowledgment:
- *    "This product includes software developed by the OpenSSL Project
- *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
- *
- * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
- *    endorse or promote products derived from this software without
- *    prior written permission. For written permission, please contact
- *    openssl-core@OpenSSL.org.
- *
- * 5. Products derived from this software may not be called "OpenSSL"
- *    nor may "OpenSSL" appear in their names without prior written
- *    permission of the OpenSSL Project.
- *
- * 6. Redistributions of any form whatsoever must retain the following
- *    acknowledgment:
- *    "This product includes software developed by the OpenSSL Project
- *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
- *
- * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
- * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
- * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
- * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
- * OF THE POSSIBILITY OF SUCH DAMAGE.
- * ====================================================================
- *
- * This product includes cryptographic software written by Eric Young
- * (eay@cryptsoft.com).  This product includes software written by Tim
- * Hudson (tjh@cryptsoft.com).
+ * Copyright 2002-2016 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
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
  */
 
 #include <openssl/ec.h>
 #include "ec_lcl.h"
-#include <string.h>
-#ifndef OPENSSL_NO_ENGINE
-# include <openssl/engine.h>
-#endif
 #include <openssl/err.h>
 
 /*-
@@ -73,7 +20,7 @@
 int ECDSA_do_verify(const unsigned char *dgst, int dgst_len,
                     const ECDSA_SIG *sig, EC_KEY *eckey)
 {
-    if (eckey->meth->verify_sig)
+    if (eckey->meth->verify_sig != NULL)
         return eckey->meth->verify_sig(dgst, dgst_len, sig, eckey);
     ECerr(EC_F_ECDSA_DO_VERIFY, EC_R_OPERATION_NOT_SUPPORTED);
     return 0;
@@ -88,24 +35,9 @@ int ECDSA_do_verify(const unsigned char *dgst, int dgst_len,
 int ECDSA_verify(int type, const unsigned char *dgst, int dgst_len,
                  const unsigned char *sigbuf, int sig_len, EC_KEY *eckey)
 {
-    ECDSA_SIG *s;
-    const unsigned char *p = sigbuf;
-    unsigned char *der = NULL;
-    int derlen = -1;
-    int ret = -1;
-
-    s = ECDSA_SIG_new();
-    if (s == NULL)
-        return (ret);
-    if (d2i_ECDSA_SIG(&s, &p, sig_len) == NULL)
-        goto err;
-    /* Ensure signature uses DER and doesn't have trailing garbage */
-    derlen = i2d_ECDSA_SIG(s, &der);
-    if (derlen != sig_len || memcmp(sigbuf, der, derlen))
-        goto err;
-    ret = ECDSA_do_verify(dgst, dgst_len, s, eckey);
- err:
-    OPENSSL_clear_free(der, derlen);
-    ECDSA_SIG_free(s);
-    return (ret);
+    if (eckey->meth->verify != NULL)
+        return eckey->meth->verify(type, dgst, dgst_len, sigbuf, sig_len,
+                                   eckey);
+    ECerr(EC_F_ECDSA_VERIFY, EC_R_OPERATION_NOT_SUPPORTED);
+    return 0;
 }