/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)

 * All rights reserved.

 *

 * This package is an SSL implementation written

 * by Eric Young (eay@cryptsoft.com).

 * The implementation was written so as to conform with Netscapes SSL.

 *

 * This library is free for commercial and non-commercial use as long as

 * the following conditions are aheared to.  The following conditions

 * apply to all code found in this distribution, be it the RC4, RSA,

 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation

 * included with this distribution is covered by the same copyright terms

 * except that the holder is Tim Hudson (tjh@cryptsoft.com).

 *

 * Copyright remains Eric Young's, and as such any Copyright notices in

 * the code are not to be removed.

 * If this package is used in a product, Eric Young should be given attribution

 * as the author of the parts of the library used.

 * This can be in the form of a textual message at program startup or

 * in documentation (online or textual) provided with the package.

 *

 * 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 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 acknowledgement:

 *    "This product includes cryptographic software written by

 *     Eric Young (eay@cryptsoft.com)"

 *    The word 'cryptographic' can be left out if the rouines from the library

 *    being used are not cryptographic related :-).

 * 4. If you include any Windows specific code (or a derivative thereof) from

 *    the apps directory (application code) you must include an acknowledgement:

 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"

 *

 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND

 * ANY EXPRESS 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 AUTHOR OR 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.

 *

 * The licence and distribution terms for any publically available version or

 * derivative of this code cannot be changed.  i.e. this code cannot simply be

 * copied and put under another distribution licence

 * [including the GNU Public Licence.] */

#include <openssl/asn1.h>

#include <openssl/bytestring.h>

#include <openssl/err.h>

#include <openssl/mem.h>

#include <openssl/time.h>

#include <string.h>

#include <time.h>

#include "internal.h"

int asn1_generalizedtime_to_tm(struct tm *tm, const ASN1_GENERALIZEDTIME *d) {

  if (d->type != V_ASN1_GENERALIZEDTIME) {

    return 0;

  }

  CBS cbs;

  CBS_init(&cbs, d->data, (size_t)d->length);

  if (!CBS_parse_generalized_time(&cbs, tm, /*allow_timezone_offset=*/0)) {

    return 0;

  }

  return 1;

}

int ASN1_GENERALIZEDTIME_check(const ASN1_GENERALIZEDTIME *d) {

  return asn1_generalizedtime_to_tm(NULL, d);

}

int ASN1_GENERALIZEDTIME_set_string(ASN1_GENERALIZEDTIME *s, const char *str) {

  size_t len = strlen(str);

  CBS cbs;

  CBS_init(&cbs, (const uint8_t *)str, len);

  if (!CBS_parse_generalized_time(&cbs, /*out_tm=*/NULL,

                                  /*allow_timezone_offset=*/0)) {

    return 0;

  }

  if (s != NULL) {

    if (!ASN1_STRING_set(s, str, len)) {

      return 0;

    }

    s->type = V_ASN1_GENERALIZEDTIME;

  }

  return 1;

}

ASN1_GENERALIZEDTIME *ASN1_GENERALIZEDTIME_set(ASN1_GENERALIZEDTIME *s,

                                               int64_t posix_time) {

  return ASN1_GENERALIZEDTIME_adj(s, posix_time, 0, 0);

}

ASN1_GENERALIZEDTIME *ASN1_GENERALIZEDTIME_adj(ASN1_GENERALIZEDTIME *s,

                                               int64_t posix_time, int offset_day,

                                               long offset_sec) {

  struct tm data;

  if (!OPENSSL_posix_to_tm(posix_time, &data)) {

    return NULL;

  }

  if (offset_day || offset_sec) {

    if (!OPENSSL_gmtime_adj(&data, offset_day, offset_sec)) {

      return NULL;

    }

  }

  if (data.tm_year < 0 - 1900 || data.tm_year > 9999 - 1900) {

    OPENSSL_PUT_ERROR(ASN1, ASN1_R_ILLEGAL_TIME_VALUE);

    return NULL;

  }

  char buf[16];

  BIO_snprintf(buf, sizeof(buf), "%04d%02d%02d%02d%02d%02dZ",

               data.tm_year + 1900, data.tm_mon + 1, data.tm_mday, data.tm_hour,

               data.tm_min, data.tm_sec);

  int free_s = 0;

  if (s == NULL) {

    free_s = 1;

    s = ASN1_UTCTIME_new();

    if (s == NULL) {

      return NULL;

    }

  }

  if (!ASN1_STRING_set(s, buf, strlen(buf))) {

    if (free_s) {

      ASN1_UTCTIME_free(s);

    }

    return NULL;

  }

  s->type = V_ASN1_GENERALIZEDTIME;

  return s;

}