a_utctm.c

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/* crypto/asn1/a_utctm.c */
/* Copyright (C) 1995-1998 Eric Young ([email protected])
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young ([email protected]).
 * 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 ([email protected]).
 * 
 * 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 ([email protected])"
 *    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 ([email protected])"
 * 
 * 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>

#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_check(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++; 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 (a[o] == 'Z')
        o++;
    else if ((a[o] == '+') || (a[o] == '-'))
        {
        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;
            o++;
            }
        }
    return(o == l);
err:
    return(0);
    }

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;

    if (s == NULL)
        s=M_ASN1_UTCTIME_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;
        }

    if((ts->tm_year < 50) || (ts->tm_year >= 150))
        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_UTCTIME_ADJ,ERR_R_MALLOC_FAILURE);
            return(NULL);
            }
        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);
    }


int ASN1_UTCTIME_cmp_time_t(const ASN1_UTCTIME *s, time_t t)
    {
    struct tm *tm;
    struct tm data;
    int offset;
    int year;

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

    if (s->data[12] == 'Z')
        offset=0;
    else
        {
        offset = g2(s->data+13)*60+g2(s->data+15);
        if (s->data[12] == '-')
            offset = -offset;
        }

    t -= offset*60; /* FIXME: may overflow in extreme cases */

    tm = OPENSSL_gmtime(&t, &data);
    
#define return_cmp(a,b) if ((a)<(b)) return -1; else if ((a)>(b)) return 1
    year = g2(s->data);
    if (year < 50)
        year += 100;
    return_cmp(year,              tm->tm_year);
    return_cmp(g2(s->data+2) - 1, tm->tm_mon);
    return_cmp(g2(s->data+4),     tm->tm_mday);
    return_cmp(g2(s->data+6),     tm->tm_hour);
    return_cmp(g2(s->data+8),     tm->tm_min);
    return_cmp(g2(s->data+10),    tm->tm_sec);
#undef g2
#undef return_cmp

    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

    return mktime(&tm)-offset*60; /* 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. */
    }
#endif