/* crypto/asn1/a_time.c */

/* ====================================================================

 * 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).

 *

 */

/*-

 * This is an implementation of the ASN1 Time structure which is:

 *    Time ::= CHOICE {

 *      utcTime        UTCTime,

 *      generalTime    GeneralizedTime }

 * written by Steve Henson.

 */

#include <stdio.h>

#include <time.h>

#include "cryptlib.h"

#include "o_time.h"

#include <openssl/asn1t.h>

#include "asn1_locl.h"

IMPLEMENT_ASN1_MSTRING(ASN1_TIME, B_ASN1_TIME)

IMPLEMENT_ASN1_FUNCTIONS(ASN1_TIME)

#if 0

int i2d_ASN1_TIME(ASN1_TIME *a, unsigned char **pp)

{

# ifdef CHARSET_EBCDIC

    /* KLUDGE! We convert to ascii before writing DER */

    char tmp[24];

    ASN1_STRING tmpstr;

    if (a->type == V_ASN1_UTCTIME || a->type == V_ASN1_GENERALIZEDTIME) {

        int len;

        tmpstr = *(ASN1_STRING *)a;

        len = tmpstr.length;

        ebcdic2ascii(tmp, tmpstr.data,

                     (len >= sizeof tmp) ? sizeof tmp : len);

        tmpstr.data = tmp;

        a = (ASN1_GENERALIZEDTIME *)&tmpstr;

    }

# endif

    if (a->type == V_ASN1_UTCTIME || a->type == V_ASN1_GENERALIZEDTIME)

        return (i2d_ASN1_bytes((ASN1_STRING *)a, pp,

                               a->type, V_ASN1_UNIVERSAL));

    ASN1err(ASN1_F_I2D_ASN1_TIME, ASN1_R_EXPECTING_A_TIME);

    return -1;

}

#endif

ASN1_TIME *ASN1_TIME_set(ASN1_TIME *s, time_t t)

{

    return ASN1_TIME_adj(s, t, 0, 0);

}

ASN1_TIME *ASN1_TIME_adj(ASN1_TIME *s, time_t t,

                         int offset_day, long offset_sec)

{

    struct tm *ts;

    struct tm data;

    ts = OPENSSL_gmtime(&t, &data);

    if (ts == NULL) {

        ASN1err(ASN1_F_ASN1_TIME_ADJ, ASN1_R_ERROR_GETTING_TIME);

        return NULL;

    }

    if (offset_day || offset_sec) {

        if (!OPENSSL_gmtime_adj(ts, offset_day, offset_sec))

            return NULL;

    }

    if ((ts->tm_year >= 50) && (ts->tm_year < 150))

        return ASN1_UTCTIME_adj(s, t, offset_day, offset_sec);

    return ASN1_GENERALIZEDTIME_adj(s, t, offset_day, offset_sec);

}

int ASN1_TIME_check(ASN1_TIME *t)

{

    if (t->type == V_ASN1_GENERALIZEDTIME)

        return ASN1_GENERALIZEDTIME_check(t);

    else if (t->type == V_ASN1_UTCTIME)

        return ASN1_UTCTIME_check(t);

    return 0;

}

/* Convert an ASN1_TIME structure to GeneralizedTime */

ASN1_GENERALIZEDTIME *ASN1_TIME_to_generalizedtime(ASN1_TIME *t,

                                                   ASN1_GENERALIZEDTIME **out)

{

    ASN1_GENERALIZEDTIME *ret = NULL;

    char *str;

    int newlen;

    if (!ASN1_TIME_check(t))

        return NULL;

    if (!out || !*out) {

        if (!(ret = ASN1_GENERALIZEDTIME_new()))

            goto err;

    } else {

        ret = *out;

    }

    /* If already GeneralizedTime just copy across */

    if (t->type == V_ASN1_GENERALIZEDTIME) {

        if (!ASN1_STRING_set(ret, t->data, t->length))

            goto err;

        goto done;

    }

    /* grow the string */

    if (!ASN1_STRING_set(ret, NULL, t->length + 2))

        goto err;

    /* ASN1_STRING_set() allocated 'len + 1' bytes. */

    newlen = t->length + 2 + 1;

    str = (char *)ret->data;

    /* Work out the century and prepend */

    if (t->data[0] >= '5')

        BUF_strlcpy(str, "19", newlen);

    else

        BUF_strlcpy(str, "20", newlen);

    BUF_strlcat(str, (char *)t->data, newlen);

 done:

   if (out != NULL && *out == NULL)

       *out = ret;

   return ret;

 err:

    if (out == NULL || *out != ret)

        ASN1_GENERALIZEDTIME_free(ret);

    return NULL;

}

int ASN1_TIME_set_string(ASN1_TIME *s, const char *str)

{

    ASN1_TIME t;

    t.length = strlen(str);

    t.data = (unsigned char *)str;

    t.flags = 0;

    t.type = V_ASN1_UTCTIME;

    if (!ASN1_TIME_check(&t)) {

        t.type = V_ASN1_GENERALIZEDTIME;

        if (!ASN1_TIME_check(&t))

            return 0;

    }

    if (s && !ASN1_STRING_copy((ASN1_STRING *)s, (ASN1_STRING *)&t))

        return 0;

    return 1;

}

static int asn1_time_to_tm(struct tm *tm, const ASN1_TIME *t)

{

    if (t == NULL) {

        time_t now_t;

        time(&now_t);

        if (OPENSSL_gmtime(&now_t, tm))

            return 1;

        return 0;

    }

    if (t->type == V_ASN1_UTCTIME)

        return asn1_utctime_to_tm(tm, t);

    else if (t->type == V_ASN1_GENERALIZEDTIME)

        return asn1_generalizedtime_to_tm(tm, t);

    return 0;

}

int ASN1_TIME_diff(int *pday, int *psec,

                   const ASN1_TIME *from, const ASN1_TIME *to)

{

    struct tm tm_from, tm_to;

    if (!asn1_time_to_tm(&tm_from, from))

        return 0;

    if (!asn1_time_to_tm(&tm_to, to))

        return 0;

    return OPENSSL_gmtime_diff(pday, psec, &tm_from, &tm_to);

}