// 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 <limits.h>

#include <stdio.h>

#include <string.h>

#include <openssl/digest.h>

#include <openssl/err.h>

#include <openssl/mem.h>

#include <openssl/obj.h>

#include <openssl/x509.h>

#include "internal.h"

using namespace bssl;

char *i2s_ASN1_OCTET_STRING(const X509V3_EXT_METHOD *method,

                            const ASN1_OCTET_STRING *oct) {

  return x509v3_bytes_to_hex(oct->data, oct->length);

}

ASN1_OCTET_STRING *s2i_ASN1_OCTET_STRING(const X509V3_EXT_METHOD *method,

                                         const X509V3_CTX *ctx,

                                         const char *str) {

  size_t len;

  uint8_t *data = x509v3_hex_to_bytes(str, &len);

  ASN1_OCTET_STRING *oct;

  if (data == nullptr) {

    return nullptr;

  }

  if (len > INT_MAX) {

    OPENSSL_PUT_ERROR(X509V3, ERR_R_OVERFLOW);

    goto err;

  }

  oct = ASN1_OCTET_STRING_new();

  if (oct == nullptr) {

    goto err;

  }

  ASN1_STRING_set0(oct, data, (int)len);

  return oct;

err:

  OPENSSL_free(data);

  return nullptr;

}

static char *i2s_ASN1_OCTET_STRING_cb(const X509V3_EXT_METHOD *method,

                                      void *ext) {

  return i2s_ASN1_OCTET_STRING(method,

                               reinterpret_cast<ASN1_OCTET_STRING *>(ext));

}

static void *s2i_skey_id(const X509V3_EXT_METHOD *method, const X509V3_CTX *ctx,

                         const char *str) {

  ASN1_OCTET_STRING *oct;

  const ASN1_BIT_STRING *pk;

  unsigned char pkey_dig[EVP_MAX_MD_SIZE];

  unsigned int diglen;

  if (strcmp(str, "hash")) {

    return s2i_ASN1_OCTET_STRING(method, ctx, str);

  }

  if (!(oct = ASN1_OCTET_STRING_new())) {

    return nullptr;

  }

  if (ctx && (ctx->flags == X509V3_CTX_TEST)) {

    return oct;

  }

  if (!ctx || (!ctx->subject_req && !ctx->subject_cert)) {

    OPENSSL_PUT_ERROR(X509V3, X509V3_R_NO_PUBLIC_KEY);

    goto err;

  }

  if (ctx->subject_req) {

    pk = &ctx->subject_req->req_info->pubkey->public_key;

  } else {

    pk = X509_get0_pubkey_bitstr(ctx->subject_cert);

  }

  if (!EVP_Digest(pk->data, pk->length, pkey_dig, &diglen, EVP_sha1(),

                  nullptr)) {

    goto err;

  }

  if (!ASN1_OCTET_STRING_set(oct, pkey_dig, diglen)) {

    goto err;

  }

  return oct;

err:

  ASN1_OCTET_STRING_free(oct);

  return nullptr;

}

const X509V3_EXT_METHOD bssl::v3_skey_id = {

    NID_subject_key_identifier,

    0,

    ASN1_ITEM_ref(ASN1_OCTET_STRING),

    nullptr,

    nullptr,

    nullptr,

    nullptr,

    i2s_ASN1_OCTET_STRING_cb,

    s2i_skey_id,

    nullptr,

    nullptr,

    nullptr,

    nullptr,

    nullptr,

};