a_time.c

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/* crypto/asn1/a_time.c */
/* ====================================================================
 * Copyright (c) 1999 The OpenSSL Project.  All rights reserved.
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 * modification, are permitted provided that the following conditions
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 *    distribution.
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 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
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 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * ([email protected]).  This product includes software written by Tim
 * Hudson ([email protected]).
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 */


/* 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
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;
    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;
    }

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;
    }