text: /* crypto/ecdsa/ecdsa_sign.c */
  /* ====================================================================
   * 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 "ecs_locl.h"
  #ifndef OPENSSL_NO_ENGINE
  #include <openssl/engine.h>
  #endif
  #include <openssl/rand.h>
  
  ECDSA_SIG *ECDSA_do_sign(const unsigned char *dgst, int dlen, EC_KEY *eckey)
  {
  	return ECDSA_do_sign_ex(dgst, dlen, NULL, NULL, eckey);
  }
  
  ECDSA_SIG *ECDSA_do_sign_ex(const unsigned char *dgst, int dlen,
  	const BIGNUM *kinv, const BIGNUM *rp, EC_KEY *eckey)
  {
  	ECDSA_DATA *ecdsa = ecdsa_check(eckey);
  	if (ecdsa == NULL)
  		return NULL;
  	return ecdsa->meth->ecdsa_do_sign(dgst, dlen, kinv, rp, eckey);
  }
  
  int ECDSA_sign(int type, const unsigned char *dgst, int dlen, unsigned char 
  		*sig, unsigned int *siglen, EC_KEY *eckey)
  {
  	return ECDSA_sign_ex(type, dgst, dlen, sig, siglen, NULL, NULL, eckey);
  }
  
  int ECDSA_sign_ex(int type, const unsigned char *dgst, int dlen, unsigned char 
  	*sig, unsigned int *siglen, const BIGNUM *kinv, const BIGNUM *r, 
  	EC_KEY *eckey)
  {
  	ECDSA_SIG *s;
  	RAND_seed(dgst, dlen);
  	s = ECDSA_do_sign_ex(dgst, dlen, kinv, r, eckey);
  	if (s == NULL)
  	{
  		*siglen=0;
  		return 0;
  	}
  	*siglen = i2d_ECDSA_SIG(s, &sig);
  	ECDSA_SIG_free(s);
  	return 1;
  }
  
  int ECDSA_sign_setup(EC_KEY *eckey, BN_CTX *ctx_in, BIGNUM **kinvp, 
  		BIGNUM **rp)
  {
  	ECDSA_DATA *ecdsa = ecdsa_check(eckey);
  	if (ecdsa == NULL)
  		return 0;
  	return ecdsa->meth->ecdsa_sign_setup(eckey, ctx_in, kinvp, rp); 
  }
  