text: /* $OpenBSD: tb_pkmeth.c,v 1.5 2015/02/11 03:19:37 doug Exp $ */
  /* ====================================================================
   * Copyright (c) 2006 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
   *    licensing@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/err.h>
  
  #include "eng_int.h"
  #include <openssl/evp.h>
  
  /* If this symbol is defined then ENGINE_get_pkey_meth_engine(), the function
   * that is used by EVP to hook in pkey_meth code and cache defaults (etc), will
   * display brief debugging summaries to stderr with the 'nid'. */
  /* #define ENGINE_PKEY_METH_DEBUG */
  
  static ENGINE_TABLE *pkey_meth_table = NULL;
  
  void
  ENGINE_unregister_pkey_meths(ENGINE *e)
  {
  	engine_table_unregister(&pkey_meth_table, e);
  }
  
  static void
  engine_unregister_all_pkey_meths(void)
  {
  	engine_table_cleanup(&pkey_meth_table);
  }
  
  int
  ENGINE_register_pkey_meths(ENGINE *e)
  {
  	if (e->pkey_meths) {
  		const int *nids;
  		int num_nids = e->pkey_meths(e, NULL, &nids, 0);
  		if (num_nids > 0)
  			return engine_table_register(&pkey_meth_table,
  			    engine_unregister_all_pkey_meths, e, nids,
  			    num_nids, 0);
  	}
  	return 1;
  }
  
  void
  ENGINE_register_all_pkey_meths(void)
  {
  	ENGINE *e;
  
  	for (e = ENGINE_get_first(); e; e = ENGINE_get_next(e))
  		ENGINE_register_pkey_meths(e);
  }
  
  int
  ENGINE_set_default_pkey_meths(ENGINE *e)
  {
  	if (e->pkey_meths) {
  		const int *nids;
  		int num_nids = e->pkey_meths(e, NULL, &nids, 0);
  		if (num_nids > 0)
  			return engine_table_register(&pkey_meth_table,
  			    engine_unregister_all_pkey_meths, e, nids,
  			    num_nids, 1);
  	}
  	return 1;
  }
  
  /* Exposed API function to get a functional reference from the implementation
   * table (ie. try to get a functional reference from the tabled structural
   * references) for a given pkey_meth 'nid' */
  ENGINE *
  ENGINE_get_pkey_meth_engine(int nid)
  {
  	return engine_table_select(&pkey_meth_table, nid);
  }
  
  /* Obtains a pkey_meth implementation from an ENGINE functional reference */
  const EVP_PKEY_METHOD *
  ENGINE_get_pkey_meth(ENGINE *e, int nid)
  {
  	EVP_PKEY_METHOD *ret;
  	ENGINE_PKEY_METHS_PTR fn = ENGINE_get_pkey_meths(e);
  
  	if (!fn || !fn(e, &ret, NULL, nid)) {
  		ENGINEerror(ENGINE_R_UNIMPLEMENTED_PUBLIC_KEY_METHOD);
  		return NULL;
  	}
  	return ret;
  }
  
  /* Gets the pkey_meth callback from an ENGINE structure */
  ENGINE_PKEY_METHS_PTR
  ENGINE_get_pkey_meths(const ENGINE *e)
  {
  	return e->pkey_meths;
  }
  
  /* Sets the pkey_meth callback in an ENGINE structure */
  int
  ENGINE_set_pkey_meths(ENGINE *e, ENGINE_PKEY_METHS_PTR f)
  {
  	e->pkey_meths = f;
  	return 1;
  }
  
  /* Internal function to free up EVP_PKEY_METHOD structures before an
   * ENGINE is destroyed
   */
  
  void
  engine_pkey_meths_free(ENGINE *e)
  {
  	int i;
  	EVP_PKEY_METHOD *pkm;
  
  	if (e->pkey_meths) {
  		const int *pknids;
  		int npknids;
  		npknids = e->pkey_meths(e, NULL, &pknids, 0);
  		for (i = 0; i < npknids; i++) {
  			if (e->pkey_meths(e, &pkm, NULL, pknids[i])) {
  				EVP_PKEY_meth_free(pkm);
  			}
  		}
  	}
  }
  