// Copyright 1999-2016 The OpenSSL Project Authors. All Rights Reserved.

//

// Licensed under the Apache License, Version 2.0 (the "License");

// you may not use this file except in compliance with the License.

// You may obtain a copy of the License at

//

//     https://www.apache.org/licenses/LICENSE-2.0

//

// Unless required by applicable law or agreed to in writing, software

// distributed under the License is distributed on an "AS IS" BASIS,

// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

// See the License for the specific language governing permissions and

// limitations under the License.

#include <stdio.h>

#include <openssl/asn1t.h>

#include <openssl/conf.h>

#include <openssl/err.h>

#include <openssl/obj.h>

#include <openssl/x509.h>

#include "internal.h"

using namespace bssl;

static void *v2i_EXTENDED_KEY_USAGE(const X509V3_EXT_METHOD *method,

                                    const X509V3_CTX *ctx,

                                    const 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 bssl::v3_ext_ku = {

    NID_ext_key_usage,

    0,

    ASN1_ITEM_ref(EXTENDED_KEY_USAGE),

    nullptr,

    nullptr,

    nullptr,

    nullptr,

    nullptr,

    nullptr,

    i2v_EXTENDED_KEY_USAGE,

    v2i_EXTENDED_KEY_USAGE,

    nullptr,

    nullptr,

    nullptr,

};

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_const(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) {

  const EXTENDED_KEY_USAGE *eku =

      reinterpret_cast<const EXTENDED_KEY_USAGE *>(a);

  for (size_t i = 0; i < sk_ASN1_OBJECT_num(eku); i++) {

    const ASN1_OBJECT *obj = sk_ASN1_OBJECT_value(eku, i);

    char obj_tmp[80];

    i2t_ASN1_OBJECT(obj_tmp, 80, obj);

    X509V3_add_value(nullptr, obj_tmp, &ext_list);

  }

  return ext_list;

}

static void *v2i_EXTENDED_KEY_USAGE(const X509V3_EXT_METHOD *method,

                                    const X509V3_CTX *ctx,

                                    const STACK_OF(CONF_VALUE) *nval) {

  EXTENDED_KEY_USAGE *extku = sk_ASN1_OBJECT_new_null();

  if (extku == nullptr) {

    return nullptr;

  }

  for (size_t i = 0; i < sk_CONF_VALUE_num(nval); i++) {

    const CONF_VALUE *val = sk_CONF_VALUE_value(nval, i);

    const char *extval;

    if (val->value) {

      extval = val->value;

    } else {

      extval = val->name;

    }

    ASN1_OBJECT *obj = OBJ_txt2obj(extval, 0);

    if (obj == nullptr || !sk_ASN1_OBJECT_push(extku, obj)) {

      ASN1_OBJECT_free(obj);

      sk_ASN1_OBJECT_pop_free(extku, ASN1_OBJECT_free);

      OPENSSL_PUT_ERROR(X509V3, X509V3_R_INVALID_OBJECT_IDENTIFIER);

      X509V3_conf_err(val);

      return nullptr;

    }

  }

  return extku;

}