text: /*
   * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
   * 1999.
   */
  /* ====================================================================
   * Copyright (c) 1999 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 <stdio.h>
  #include "internal/cryptlib.h"
  #include <openssl/asn1t.h>
  #include <openssl/conf.h>
  #include <openssl/x509v3.h>
  #include "ext_dat.h"
  
  static void *v2i_EXTENDED_KEY_USAGE(const X509V3_EXT_METHOD *method,
                                      X509V3_CTX *ctx,
                                      STACK_OF(CONF_VALUE) *nval);
  static STACK_OF(CONF_VALUE) *i2v_EXTENDED_KEY_USAGE(const X509V3_EXT_METHOD
                                                      *method, void *eku, STACK_OF(CONF_VALUE)
                                                      *extlist);
  
  const X509V3_EXT_METHOD v3_ext_ku = {
      NID_ext_key_usage, 0,
      ASN1_ITEM_ref(EXTENDED_KEY_USAGE),
      0, 0, 0, 0,
      0, 0,
      i2v_EXTENDED_KEY_USAGE,
      v2i_EXTENDED_KEY_USAGE,
      0, 0,
      NULL
  };
  
  /* NB OCSP acceptable responses also is a SEQUENCE OF OBJECT */
  const X509V3_EXT_METHOD v3_ocsp_accresp = {
      NID_id_pkix_OCSP_acceptableResponses, 0,
      ASN1_ITEM_ref(EXTENDED_KEY_USAGE),
      0, 0, 0, 0,
      0, 0,
      i2v_EXTENDED_KEY_USAGE,
      v2i_EXTENDED_KEY_USAGE,
      0, 0,
      NULL
  };
  
  ASN1_ITEM_TEMPLATE(EXTENDED_KEY_USAGE) =
          ASN1_EX_TEMPLATE_TYPE(ASN1_TFLG_SEQUENCE_OF, 0, EXTENDED_KEY_USAGE, ASN1_OBJECT)
  ASN1_ITEM_TEMPLATE_END(EXTENDED_KEY_USAGE)
  
  IMPLEMENT_ASN1_FUNCTIONS(EXTENDED_KEY_USAGE)
  
  static STACK_OF(CONF_VALUE) *i2v_EXTENDED_KEY_USAGE(const X509V3_EXT_METHOD
                                                      *method, void *a, STACK_OF(CONF_VALUE)
                                                      *ext_list)
  {
      EXTENDED_KEY_USAGE *eku = a;
      int i;
      ASN1_OBJECT *obj;
      char obj_tmp[80];
      for (i = 0; i < sk_ASN1_OBJECT_num(eku); i++) {
          obj = sk_ASN1_OBJECT_value(eku, i);
          i2t_ASN1_OBJECT(obj_tmp, 80, obj);
          X509V3_add_value(NULL, obj_tmp, &ext_list);
      }
      return ext_list;
  }
  
  static void *v2i_EXTENDED_KEY_USAGE(const X509V3_EXT_METHOD *method,
                                      X509V3_CTX *ctx,
                                      STACK_OF(CONF_VALUE) *nval)
  {
      EXTENDED_KEY_USAGE *extku;
      char *extval;
      ASN1_OBJECT *objtmp;
      CONF_VALUE *val;
      int i;
  
      if ((extku = sk_ASN1_OBJECT_new_null()) == NULL) {
          X509V3err(X509V3_F_V2I_EXTENDED_KEY_USAGE, ERR_R_MALLOC_FAILURE);
          return NULL;
      }
  
      for (i = 0; i < sk_CONF_VALUE_num(nval); i++) {
          val = sk_CONF_VALUE_value(nval, i);
          if (val->value)
              extval = val->value;
          else
              extval = val->name;
          if ((objtmp = OBJ_txt2obj(extval, 0)) == NULL) {
              sk_ASN1_OBJECT_pop_free(extku, ASN1_OBJECT_free);
              X509V3err(X509V3_F_V2I_EXTENDED_KEY_USAGE,
                        X509V3_R_INVALID_OBJECT_IDENTIFIER);
              X509V3_conf_err(val);
              return NULL;
          }
          sk_ASN1_OBJECT_push(extku, objtmp);
      }
      return extku;
  }
  