/* 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

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 *    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.

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 * 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

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 * ====================================================================

 *

 * 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>

IMPLEMENT_ASN1_MSTRING(ASN1_TIME, B_ASN1_TIME)

IMPLEMENT_ASN1_FUNCTIONS(ASN1_TIME)

#if 0

EXPORT_C 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

EXPORT_C ASN1_TIME *ASN1_TIME_set(ASN1_TIME *s, time_t t)

	{

	struct tm *ts;

	struct tm data;

	ts=OPENSSL_gmtime(&t,&data);

	if (ts == NULL)

		{

		ASN1err(ASN1_F_ASN1_TIME_SET, ASN1_R_ERROR_GETTING_TIME);

		return NULL;

		}

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

					return ASN1_UTCTIME_set(s, t);

	return ASN1_GENERALIZEDTIME_set(s,t);

	}

EXPORT_C 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 */

EXPORT_C ASN1_GENERALIZEDTIME *ASN1_TIME_to_generalizedtime(ASN1_TIME *t, ASN1_GENERALIZEDTIME **out)

	{

	ASN1_GENERALIZEDTIME *ret;

	char *str;

	int newlen;

	if (!ASN1_TIME_check(t)) return NULL;

	if (!out || !*out)

		{

		if (!(ret = ASN1_GENERALIZEDTIME_new ()))

			return NULL;

		if (out) *out = ret;

		}

	else ret = *out;

	/* If already GeneralizedTime just copy across */

	if (t->type == V_ASN1_GENERALIZEDTIME)

		{

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

			return NULL;

		return ret;

		}

	/* grow the string */

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

		return NULL;

	/* 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);

	return ret;

	}