/* crypto/asn1/a_gentm.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.]

 */

/*

 * GENERALIZEDTIME implementation, written by Steve Henson. Based on UTCTIME

 */

#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_GENERALIZEDTIME(ASN1_GENERALIZEDTIME *a, unsigned char **pp)

{

# ifdef CHARSET_EBCDIC

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

    int len;

    char tmp[24];

    ASN1_STRING 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

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

                           V_ASN1_GENERALIZEDTIME, V_ASN1_UNIVERSAL));

}

ASN1_GENERALIZEDTIME *d2i_ASN1_GENERALIZEDTIME(ASN1_GENERALIZEDTIME **a,

                                               unsigned char **pp,

                                               long length)

{

    ASN1_GENERALIZEDTIME *ret = NULL;

    ret =

        (ASN1_GENERALIZEDTIME *)d2i_ASN1_bytes((ASN1_STRING **)a, pp, length,

                                               V_ASN1_GENERALIZEDTIME,

                                               V_ASN1_UNIVERSAL);

    if (ret == NULL) {

        ASN1err(ASN1_F_D2I_ASN1_GENERALIZEDTIME, ERR_R_NESTED_ASN1_ERROR);

        return (NULL);

    }

# ifdef CHARSET_EBCDIC

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

# endif

    if (!ASN1_GENERALIZEDTIME_check(ret)) {

        ASN1err(ASN1_F_D2I_ASN1_GENERALIZEDTIME, ASN1_R_INVALID_TIME_FORMAT);

        goto err;

    }

    return (ret);

 err:

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

        M_ASN1_GENERALIZEDTIME_free(ret);

    return (NULL);

}

#endif

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

{

    static const int min[9] = { 0, 0, 1, 1, 0, 0, 0, 0, 0 };

    static const int max[9] = { 99, 99, 12, 31, 23, 59, 59, 12, 59 };

    char *a;

    int n, i, l, o;

    if (d->type != V_ASN1_GENERALIZEDTIME)

        return (0);

    l = d->length;

    a = (char *)d->data;

    o = 0;

    /*

     * GENERALIZEDTIME is similar to UTCTIME except the year is represented

     * as YYYY. This stuff treats everything as a two digit field so make

     * first two fields 00 to 99

     */

    if (l < 13)

        goto err;

    for (i = 0; i < 7; i++) {

        if ((i == 6) && ((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 * 100 - 1900;

                break;

            case 1:

                tm->tm_year += n;

                break;

            case 2:

                tm->tm_mon = n - 1;

                break;

            case 3:

                tm->tm_mday = n;

                break;

            case 4:

                tm->tm_hour = n;

                break;

            case 5:

                tm->tm_min = n;

                break;

            case 6:

                tm->tm_sec = n;

                break;

            }

        }

    }

    /*

     * Optional fractional seconds: decimal point followed by one or more

     * digits.

     */

    if (a[o] == '.') {

        if (++o > l)

            goto err;

        i = o;

        while ((a[o] >= '0') && (a[o] <= '9') && (o <= l))

            o++;

        /* Must have at least one digit after decimal point */

        if (i == o)

            goto err;

    }

    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 = 7; i < 9; 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 == 7)

                    offset = n * 3600;

                else if (i == 8)

                    offset += n * 60;

            }

            o++;

        }

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

            return 0;

    } else if (a[o]) {

        /* Missing time zone information. */

        goto err;

    }

    return (o == l);

 err:

    return (0);

}

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)

{

    ASN1_GENERALIZEDTIME t;

    t.type = V_ASN1_GENERALIZEDTIME;

    t.length = strlen(str);

    t.data = (unsigned char *)str;

    if (ASN1_GENERALIZEDTIME_check(&t)) {

        if (s != NULL) {

            if (!ASN1_STRING_set((ASN1_STRING *)s,

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

                return 0;

            s->type = V_ASN1_GENERALIZEDTIME;

        }

        return (1);

    } else

        return (0);

}

ASN1_GENERALIZEDTIME *ASN1_GENERALIZEDTIME_set(ASN1_GENERALIZEDTIME *s,

                                               time_t t)

{

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

}

ASN1_GENERALIZEDTIME *ASN1_GENERALIZEDTIME_adj(ASN1_GENERALIZEDTIME *s,

                                               time_t t, int offset_day,

                                               long offset_sec)

{

    char *p;

    struct tm *ts;

    struct tm data;

    size_t len = 20;

    if (s == NULL)

        s = M_ASN1_GENERALIZEDTIME_new();

    if (s == NULL)

        return (NULL);

    ts = OPENSSL_gmtime(&t, &data);

    if (ts == NULL)

        return (NULL);

    if (offset_day || offset_sec) {

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

            return NULL;

    }

    p = (char *)s->data;

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

        p = OPENSSL_malloc(len);

        if (p == NULL) {

            ASN1err(ASN1_F_ASN1_GENERALIZEDTIME_ADJ, ERR_R_MALLOC_FAILURE);

            return (NULL);

        }

        if (s->data != NULL)

            OPENSSL_free(s->data);

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

    }

    BIO_snprintf(p, len, "%04d%02d%02d%02d%02d%02dZ", ts->tm_year + 1900,

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

                 ts->tm_sec);

    s->length = strlen(p);

    s->type = V_ASN1_GENERALIZEDTIME;

#ifdef CHARSET_EBCDIC_not

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

#endif

    return (s);

}