Move and adapt ECDSA sign and verify functions.

Reviewed-by: Richard Levitte <levitte@openssl.org>

1 files changed, 109 insertions, 0 deletions

diff --git a/crypto/ec/ecdsa_vrf.c b/crypto/ec/ecdsa_vrf.c
new file mode 100644
index 0000000000..ef8c66f448
--- /dev/null
+++ b/crypto/ec/ecdsa_vrf.c
@@ -0,0 +1,109 @@
+/* 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).
+ *
+ */
+
+#include <openssl/ec.h>
+#include "ec_lcl.h"
+#include <string.h>
+#ifndef OPENSSL_NO_ENGINE
+# include <openssl/engine.h>
+#endif
+
+/*-
+ * returns
+ *      1: correct signature
+ *      0: incorrect signature
+ *     -1: error
+ */
+int ECDSA_do_verify(const unsigned char *dgst, int dgst_len,
+                    const ECDSA_SIG *sig, EC_KEY *eckey)
+{
+    if (eckey->meth->verify_sig)
+        return eckey->meth->verify_sig(dgst, dgst_len, sig, eckey);
+    return 0;
+}
+
+/*-
+ * returns
+ *      1: correct signature
+ *      0: incorrect signature
+ *     -1: error
+ */
+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);
+}