Add ECDH support.

Additional changes:
 - use EC_GROUP_get_degree() in apps/req.c
 - add ECDSA and ECDH to apps/speed.c
 - adds support for EC curves over binary fields to ECDSA
 - new function EC_KEY_up_ref() in crypto/ec/ec_key.c
 - reorganize crypto/ecdsa/ecdsatest.c
 - add engine support for ECDH
 - fix a few bugs in ECDSA engine support

Submitted by: Douglas Stebila <douglas.stebila@sun.com>

crypto/x509/x509.h

@@ -55,6 +55,11 @@
  * copied and put under another distribution licence
  * [including the GNU Public Licence.]
  */
+/* ====================================================================
+ * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
+ * ECDH support in OpenSSL originally developed by 
+ * SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project.
+ */
 
 #ifndef HEADER_X509_H
 #define HEADER_X509_H
@@ -89,6 +94,10 @@
 #include <openssl/ecdsa.h>
 #endif
 
+#ifndef OPENSSL_NO_ECDH
+#include <openssl/ecdh.h>
+#endif
+
 #ifndef OPENSSL_NO_DH
 #include <openssl/dh.h>
 #endif