// 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 <string.h>

#include <openssl/conf.h>

#include <openssl/err.h>

#include <openssl/obj.h>

#include <openssl/x509.h>

#include "internal.h"

using namespace bssl;

static const BIT_STRING_BITNAME ns_cert_type_table[] = {

    {0, "SSL Client", "client"}, {1, "SSL Server", "server"},

    {2, "S/MIME", "email"},      {3, "Object Signing", "objsign"},

    {4, "Unused", "reserved"},   {5, "SSL CA", "sslCA"},

    {6, "S/MIME CA", "emailCA"}, {7, "Object Signing CA", "objCA"},

    {-1, nullptr, nullptr}};

static const BIT_STRING_BITNAME key_usage_type_table[] = {

    {0, "Digital Signature", "digitalSignature"},

    {1, "Non Repudiation", "nonRepudiation"},

    {2, "Key Encipherment", "keyEncipherment"},

    {3, "Data Encipherment", "dataEncipherment"},

    {4, "Key Agreement", "keyAgreement"},

    {5, "Certificate Sign", "keyCertSign"},

    {6, "CRL Sign", "cRLSign"},

    {7, "Encipher Only", "encipherOnly"},

    {8, "Decipher Only", "decipherOnly"},

    {-1, nullptr, nullptr}};

static STACK_OF(CONF_VALUE) *i2v_ASN1_BIT_STRING(

    const X509V3_EXT_METHOD *method, void *ext, STACK_OF(CONF_VALUE) *ret) {

  const ASN1_BIT_STRING *bits = reinterpret_cast<ASN1_BIT_STRING *>(ext);

  const BIT_STRING_BITNAME *bnam;

  for (bnam = reinterpret_cast<const BIT_STRING_BITNAME *>(method->usr_data);

       bnam->lname; bnam++) {

    if (ASN1_BIT_STRING_get_bit(bits, bnam->bitnum)) {

      X509V3_add_value(bnam->lname, nullptr, &ret);

    }

  }

  return ret;

}

static void *v2i_ASN1_BIT_STRING(const X509V3_EXT_METHOD *method,

                                 const X509V3_CTX *ctx,

                                 const STACK_OF(CONF_VALUE) *nval) {

  ASN1_BIT_STRING *bs;

  if (!(bs = ASN1_BIT_STRING_new())) {

    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 BIT_STRING_BITNAME *bnam;

    for (bnam = reinterpret_cast<const BIT_STRING_BITNAME *>(method->usr_data);

         bnam->lname; bnam++) {

      if (!strcmp(bnam->sname, val->name) || !strcmp(bnam->lname, val->name)) {

        if (!ASN1_BIT_STRING_set_bit(bs, bnam->bitnum, 1)) {

          ASN1_BIT_STRING_free(bs);

          return nullptr;

        }

        break;

      }

    }

    if (!bnam->lname) {

      OPENSSL_PUT_ERROR(X509V3, X509V3_R_UNKNOWN_BIT_STRING_ARGUMENT);

      X509V3_conf_err(val);

      ASN1_BIT_STRING_free(bs);

      return nullptr;

    }

  }

  return bs;

}

#define EXT_BITSTRING(nid, table)                                             \

  {                                                                           \

    nid, 0, ASN1_ITEM_ref(ASN1_BIT_STRING), 0, 0, 0, 0, 0, 0,                 \

        i2v_ASN1_BIT_STRING, v2i_ASN1_BIT_STRING, nullptr, nullptr,           \

    (void *)(table)                                                           \

  }

const X509V3_EXT_METHOD bssl::v3_nscert =

    EXT_BITSTRING(NID_netscape_cert_type, ns_cert_type_table);

const X509V3_EXT_METHOD bssl::v3_key_usage =

    EXT_BITSTRING(NID_key_usage, key_usage_type_table);