/* crypto/asn1/a_utctm.c */

/* 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 <stdio.h>

#include <time.h>

#include "cryptlib.h"

#include "o_time.h"

#include <openssl/asn1.h>

#include "asn1_locl.h"

#if 0

int i2d_ASN1_UTCTIME(ASN1_UTCTIME *a, unsigned char **pp)

{

# ifndef CHARSET_EBCDIC

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

                           V_ASN1_UTCTIME, V_ASN1_UNIVERSAL));

# else

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

    int len;

    char tmp[24];

    ASN1_STRING x = *(ASN1_STRING *)a;

    len = x.length;

    ebcdic2ascii(tmp, x.data, (len >= sizeof tmp) ? sizeof tmp : len);

    x.data = tmp;

    return i2d_ASN1_bytes(&x, pp, V_ASN1_UTCTIME, V_ASN1_UNIVERSAL);

# endif

}

ASN1_UTCTIME *d2i_ASN1_UTCTIME(ASN1_UTCTIME **a, unsigned char **pp,

                               long length)

{

    ASN1_UTCTIME *ret = NULL;

    ret = (ASN1_UTCTIME *)d2i_ASN1_bytes((ASN1_STRING **)a, pp, length,

                                         V_ASN1_UTCTIME, V_ASN1_UNIVERSAL);

    if (ret == NULL) {

        ASN1err(ASN1_F_D2I_ASN1_UTCTIME, ERR_R_NESTED_ASN1_ERROR);

        return (NULL);

    }

# ifdef CHARSET_EBCDIC

    ascii2ebcdic(ret->data, ret->data, ret->length);

# endif

    if (!ASN1_UTCTIME_check(ret)) {

        ASN1err(ASN1_F_D2I_ASN1_UTCTIME, ASN1_R_INVALID_TIME_FORMAT);

        goto err;

    }

    return (ret);

 err:

    if ((ret != NULL) && ((a == NULL) || (*a != ret)))

        M_ASN1_UTCTIME_free(ret);

    return (NULL);

}

#endif

int asn1_utctime_to_tm(struct tm *tm, const ASN1_UTCTIME *d)

{

    static const int min[8] = { 0, 1, 1, 0, 0, 0, 0, 0 };

    static const int max[8] = { 99, 12, 31, 23, 59, 59, 12, 59 };

    char *a;

    int n, i, l, o;

    if (d->type != V_ASN1_UTCTIME)

        return (0);

    l = d->length;

    a = (char *)d->data;

    o = 0;

    if (l < 11)

        goto err;

    for (i = 0; i < 6; i++) {

        if ((i == 5) && ((a[o] == 'Z') || (a[o] == '+') || (a[o] == '-'))) {

            i++;

            if (tm)

                tm->tm_sec = 0;

            break;

        }

        if ((a[o] < '0') || (a[o] > '9'))

            goto err;

        n = a[o] - '0';

        if (++o > l)

            goto err;

        if ((a[o] < '0') || (a[o] > '9'))

            goto err;

        n = (n * 10) + a[o] - '0';

        if (++o > l)

            goto err;

        if ((n < min[i]) || (n > max[i]))

            goto err;

        if (tm) {

            switch (i) {

            case 0:

                tm->tm_year = n < 50 ? n + 100 : n;

                break;

            case 1:

                tm->tm_mon = n - 1;

                break;

            case 2:

                tm->tm_mday = n;

                break;

            case 3:

                tm->tm_hour = n;

                break;

            case 4:

                tm->tm_min = n;

                break;

            case 5:

                tm->tm_sec = n;

                break;

            }

        }

    }

    if (a[o] == 'Z')

        o++;

    else if ((a[o] == '+') || (a[o] == '-')) {

        int offsign = a[o] == '-' ? 1 : -1, offset = 0;

        o++;

        if (o + 4 > l)

            goto err;

        for (i = 6; i < 8; i++) {

            if ((a[o] < '0') || (a[o] > '9'))

                goto err;

            n = a[o] - '0';

            o++;

            if ((a[o] < '0') || (a[o] > '9'))

                goto err;

            n = (n * 10) + a[o] - '0';

            if ((n < min[i]) || (n > max[i]))

                goto err;

            if (tm) {

                if (i == 6)

                    offset = n * 3600;

                else if (i == 7)

                    offset += n * 60;

            }

            o++;

        }

        if (offset && !OPENSSL_gmtime_adj(tm, 0, offset * offsign))

            return 0;

    }

    return o == l;

 err:

    return 0;

}

int ASN1_UTCTIME_check(const ASN1_UTCTIME *d)

{

    return asn1_utctime_to_tm(NULL, d);

}

int ASN1_UTCTIME_set_string(ASN1_UTCTIME *s, const char *str)

{

    ASN1_UTCTIME t;

    t.type = V_ASN1_UTCTIME;

    t.length = strlen(str);

    t.data = (unsigned char *)str;

    if (ASN1_UTCTIME_check(&t)) {

        if (s != NULL) {

            if (!ASN1_STRING_set((ASN1_STRING *)s,

                                 (unsigned char *)str, t.length))

                return 0;

            s->type = V_ASN1_UTCTIME;

        }

        return (1);

    } else

        return (0);

}

ASN1_UTCTIME *ASN1_UTCTIME_set(ASN1_UTCTIME *s, time_t t)

{

    return ASN1_UTCTIME_adj(s, t, 0, 0);

}

ASN1_UTCTIME *ASN1_UTCTIME_adj(ASN1_UTCTIME *s, time_t t,

                               int offset_day, long offset_sec)

{

    char *p;

    struct tm *ts;

    struct tm data;

    size_t len = 20;

    int free_s = 0;

    if (s == NULL) {

        free_s = 1;

        s = M_ASN1_UTCTIME_new();

    }

    if (s == NULL)

        goto err;

    ts = OPENSSL_gmtime(&t, &data);

    if (ts == NULL)

        goto err;

    if (offset_day || offset_sec) {

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

            goto err;

    }

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

        goto err;

    p = (char *)s->data;

    if ((p == NULL) || ((size_t)s->length < len)) {

        p = OPENSSL_malloc(len);

        if (p == NULL) {

            ASN1err(ASN1_F_ASN1_UTCTIME_ADJ, ERR_R_MALLOC_FAILURE);

            goto err;

        }

        if (s->data != NULL)

            OPENSSL_free(s->data);

        s->data = (unsigned char *)p;

    }

    BIO_snprintf(p, len, "%02d%02d%02d%02d%02d%02dZ", ts->tm_year % 100,

                 ts->tm_mon + 1, ts->tm_mday, ts->tm_hour, ts->tm_min,

                 ts->tm_sec);

    s->length = strlen(p);

    s->type = V_ASN1_UTCTIME;

#ifdef CHARSET_EBCDIC_not

    ebcdic2ascii(s->data, s->data, s->length);

#endif

    return (s);

 err:

    if (free_s && s)

        M_ASN1_UTCTIME_free(s);

    return NULL;

}

int ASN1_UTCTIME_cmp_time_t(const ASN1_UTCTIME *s, time_t t)

{

    struct tm stm, ttm;

    int day, sec;

    if (!asn1_utctime_to_tm(&stm, s))

        return -2;

    if (!OPENSSL_gmtime(&t, &ttm))

        return -2;

    if (!OPENSSL_gmtime_diff(&day, &sec, &ttm, &stm))

        return -2;

    if (day > 0)

        return 1;

    if (day < 0)

        return -1;

    if (sec > 0)

        return 1;

    if (sec < 0)

        return -1;

    return 0;

}

#if 0

time_t ASN1_UTCTIME_get(const ASN1_UTCTIME *s)

{

    struct tm tm;

    int offset;

    memset(&tm, '\0', sizeof tm);

# define g2(p) (((p)[0]-'0')*10+(p)[1]-'0')

    tm.tm_year = g2(s->data);

    if (tm.tm_year < 50)

        tm.tm_year += 100;

    tm.tm_mon = g2(s->data + 2) - 1;

    tm.tm_mday = g2(s->data + 4);

    tm.tm_hour = g2(s->data + 6);

    tm.tm_min = g2(s->data + 8);

    tm.tm_sec = g2(s->data + 10);

    if (s->data[12] == 'Z')

        offset = 0;

    else {

        offset = g2(s->data + 13) * 60 + g2(s->data + 15);

        if (s->data[12] == '-')

            offset = -offset;

    }

# undef g2

    /*

     * FIXME: mktime assumes the current timezone

     * instead of UTC, and unless we rewrite OpenSSL

     * in Lisp we cannot locally change the timezone

     * without possibly interfering with other parts

     * of the program. timegm, which uses UTC, is

     * non-standard.

     * Also time_t is inappropriate for general

     * UTC times because it may a 32 bit type.

     */

    return mktime(&tm) - offset * 60;

}

#endif