419 lines
8.5 KiB
C
419 lines
8.5 KiB
C
/*
|
|
* Copyright (c) 1997 - 2001 Kungliga Tekniska Högskolan
|
|
* (Royal Institute of Technology, Stockholm, Sweden).
|
|
* 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 the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* 3. Neither the name of the Institute nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``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 INSTITUTE 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.
|
|
*/
|
|
|
|
#include "der_locl.h"
|
|
|
|
RCSID("$Id: der_put.c,v 1.27 2001/09/25 23:37:25 assar Exp $");
|
|
|
|
/*
|
|
* All encoding functions take a pointer `p' to first position in
|
|
* which to write, from the right, `len' which means the maximum
|
|
* number of characters we are able to write. The function returns
|
|
* the number of characters written in `size' (if non-NULL).
|
|
* The return value is 0 or an error.
|
|
*/
|
|
|
|
static int
|
|
der_put_unsigned (unsigned char *p, size_t len, unsigned val, size_t *size)
|
|
{
|
|
unsigned char *base = p;
|
|
|
|
if (val) {
|
|
while (len > 0 && val) {
|
|
*p-- = val % 256;
|
|
val /= 256;
|
|
--len;
|
|
}
|
|
if (val != 0)
|
|
return ASN1_OVERFLOW;
|
|
else {
|
|
*size = base - p;
|
|
return 0;
|
|
}
|
|
} else if (len < 1)
|
|
return ASN1_OVERFLOW;
|
|
else {
|
|
*p = 0;
|
|
*size = 1;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
int
|
|
der_put_int (unsigned char *p, size_t len, int val, size_t *size)
|
|
{
|
|
unsigned char *base = p;
|
|
|
|
if(val >= 0) {
|
|
do {
|
|
if(len < 1)
|
|
return ASN1_OVERFLOW;
|
|
*p-- = val % 256;
|
|
len--;
|
|
val /= 256;
|
|
} while(val);
|
|
if(p[1] >= 128) {
|
|
if(len < 1)
|
|
return ASN1_OVERFLOW;
|
|
*p-- = 0;
|
|
len--;
|
|
}
|
|
} else {
|
|
val = ~val;
|
|
do {
|
|
if(len < 1)
|
|
return ASN1_OVERFLOW;
|
|
*p-- = ~(val % 256);
|
|
len--;
|
|
val /= 256;
|
|
} while(val);
|
|
if(p[1] < 128) {
|
|
if(len < 1)
|
|
return ASN1_OVERFLOW;
|
|
*p-- = 0xff;
|
|
len--;
|
|
}
|
|
}
|
|
*size = base - p;
|
|
return 0;
|
|
}
|
|
|
|
|
|
int
|
|
der_put_length (unsigned char *p, size_t len, size_t val, size_t *size)
|
|
{
|
|
if (len < 1)
|
|
return ASN1_OVERFLOW;
|
|
if (val < 128) {
|
|
*p = val;
|
|
*size = 1;
|
|
return 0;
|
|
} else {
|
|
size_t l;
|
|
int e;
|
|
|
|
e = der_put_unsigned (p, len - 1, val, &l);
|
|
if (e)
|
|
return e;
|
|
p -= l;
|
|
*p = 0x80 | l;
|
|
*size = l + 1;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
int
|
|
der_put_general_string (unsigned char *p, size_t len,
|
|
const general_string *str, size_t *size)
|
|
{
|
|
size_t slen = strlen(*str);
|
|
|
|
if (len < slen)
|
|
return ASN1_OVERFLOW;
|
|
p -= slen;
|
|
len -= slen;
|
|
memcpy (p+1, *str, slen);
|
|
*size = slen;
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
der_put_octet_string (unsigned char *p, size_t len,
|
|
const octet_string *data, size_t *size)
|
|
{
|
|
if (len < data->length)
|
|
return ASN1_OVERFLOW;
|
|
p -= data->length;
|
|
len -= data->length;
|
|
memcpy (p+1, data->data, data->length);
|
|
*size = data->length;
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
der_put_oid (unsigned char *p, size_t len,
|
|
const oid *data, size_t *size)
|
|
{
|
|
unsigned char *base = p;
|
|
int n;
|
|
|
|
for (n = data->length - 1; n >= 2; --n) {
|
|
unsigned u = data->components[n];
|
|
|
|
if (len < 1)
|
|
return ASN1_OVERFLOW;
|
|
*p-- = u % 128;
|
|
u /= 128;
|
|
--len;
|
|
while (u > 0) {
|
|
if (len < 1)
|
|
return ASN1_OVERFLOW;
|
|
*p-- = 128 + u % 128;
|
|
u /= 128;
|
|
--len;
|
|
}
|
|
}
|
|
if (len < 1)
|
|
return ASN1_OVERFLOW;
|
|
*p-- = 40 * data->components[0] + data->components[1];
|
|
*size = base - p;
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
der_put_tag (unsigned char *p, size_t len, Der_class class, Der_type type,
|
|
int tag, size_t *size)
|
|
{
|
|
if (len < 1)
|
|
return ASN1_OVERFLOW;
|
|
*p = (class << 6) | (type << 5) | tag; /* XXX */
|
|
*size = 1;
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
der_put_length_and_tag (unsigned char *p, size_t len, size_t len_val,
|
|
Der_class class, Der_type type, int tag, size_t *size)
|
|
{
|
|
size_t ret = 0;
|
|
size_t l;
|
|
int e;
|
|
|
|
e = der_put_length (p, len, len_val, &l);
|
|
if(e)
|
|
return e;
|
|
p -= l;
|
|
len -= l;
|
|
ret += l;
|
|
e = der_put_tag (p, len, class, type, tag, &l);
|
|
if(e)
|
|
return e;
|
|
p -= l;
|
|
len -= l;
|
|
ret += l;
|
|
*size = ret;
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
encode_integer (unsigned char *p, size_t len, const int *data, size_t *size)
|
|
{
|
|
int num = *data;
|
|
size_t ret = 0;
|
|
size_t l;
|
|
int e;
|
|
|
|
e = der_put_int (p, len, num, &l);
|
|
if(e)
|
|
return e;
|
|
p -= l;
|
|
len -= l;
|
|
ret += l;
|
|
e = der_put_length_and_tag (p, len, l, UNIV, PRIM, UT_Integer, &l);
|
|
if (e)
|
|
return e;
|
|
p -= l;
|
|
len -= l;
|
|
ret += l;
|
|
*size = ret;
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
encode_unsigned (unsigned char *p, size_t len, const unsigned *data,
|
|
size_t *size)
|
|
{
|
|
unsigned num = *data;
|
|
size_t ret = 0;
|
|
size_t l;
|
|
int e;
|
|
|
|
e = der_put_unsigned (p, len, num, &l);
|
|
if(e)
|
|
return e;
|
|
p -= l;
|
|
len -= l;
|
|
ret += l;
|
|
e = der_put_length_and_tag (p, len, l, UNIV, PRIM, UT_Integer, &l);
|
|
if (e)
|
|
return e;
|
|
p -= l;
|
|
len -= l;
|
|
ret += l;
|
|
*size = ret;
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
encode_enumerated (unsigned char *p, size_t len, const unsigned *data,
|
|
size_t *size)
|
|
{
|
|
unsigned num = *data;
|
|
size_t ret = 0;
|
|
size_t l;
|
|
int e;
|
|
|
|
e = der_put_int (p, len, num, &l);
|
|
if(e)
|
|
return e;
|
|
p -= l;
|
|
len -= l;
|
|
ret += l;
|
|
e = der_put_length_and_tag (p, len, l, UNIV, PRIM, UT_Enumerated, &l);
|
|
if (e)
|
|
return e;
|
|
p -= l;
|
|
len -= l;
|
|
ret += l;
|
|
*size = ret;
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
encode_general_string (unsigned char *p, size_t len,
|
|
const general_string *data, size_t *size)
|
|
{
|
|
size_t ret = 0;
|
|
size_t l;
|
|
int e;
|
|
|
|
e = der_put_general_string (p, len, data, &l);
|
|
if (e)
|
|
return e;
|
|
p -= l;
|
|
len -= l;
|
|
ret += l;
|
|
e = der_put_length_and_tag (p, len, l, UNIV, PRIM, UT_GeneralString, &l);
|
|
if (e)
|
|
return e;
|
|
p -= l;
|
|
len -= l;
|
|
ret += l;
|
|
*size = ret;
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
encode_octet_string (unsigned char *p, size_t len,
|
|
const octet_string *k, size_t *size)
|
|
{
|
|
size_t ret = 0;
|
|
size_t l;
|
|
int e;
|
|
|
|
e = der_put_octet_string (p, len, k, &l);
|
|
if (e)
|
|
return e;
|
|
p -= l;
|
|
len -= l;
|
|
ret += l;
|
|
e = der_put_length_and_tag (p, len, l, UNIV, PRIM, UT_OctetString, &l);
|
|
if (e)
|
|
return e;
|
|
p -= l;
|
|
len -= l;
|
|
ret += l;
|
|
*size = ret;
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
encode_oid(unsigned char *p, size_t len,
|
|
const oid *k, size_t *size)
|
|
{
|
|
size_t ret = 0;
|
|
size_t l;
|
|
int e;
|
|
|
|
e = der_put_oid (p, len, k, &l);
|
|
if (e)
|
|
return e;
|
|
p -= l;
|
|
len -= l;
|
|
ret += l;
|
|
e = der_put_length_and_tag (p, len, l, UNIV, PRIM, UT_OID, &l);
|
|
if (e)
|
|
return e;
|
|
p -= l;
|
|
len -= l;
|
|
ret += l;
|
|
*size = ret;
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
time2generalizedtime (time_t t, octet_string *s)
|
|
{
|
|
struct tm *tm;
|
|
|
|
s->data = malloc(16);
|
|
if (s->data == NULL)
|
|
return ENOMEM;
|
|
s->length = 15;
|
|
tm = gmtime (&t);
|
|
sprintf (s->data, "%04d%02d%02d%02d%02d%02dZ", tm->tm_year + 1900,
|
|
tm->tm_mon + 1, tm->tm_mday, tm->tm_hour, tm->tm_min,
|
|
tm->tm_sec);
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
encode_generalized_time (unsigned char *p, size_t len,
|
|
const time_t *t, size_t *size)
|
|
{
|
|
size_t ret = 0;
|
|
size_t l;
|
|
octet_string k;
|
|
int e;
|
|
|
|
e = time2generalizedtime (*t, &k);
|
|
if (e)
|
|
return e;
|
|
e = der_put_octet_string (p, len, &k, &l);
|
|
free (k.data);
|
|
if (e)
|
|
return e;
|
|
p -= l;
|
|
len -= l;
|
|
ret += l;
|
|
e = der_put_length_and_tag (p, len, k.length, UNIV, PRIM,
|
|
UT_GeneralizedTime, &l);
|
|
if (e)
|
|
return e;
|
|
p -= l;
|
|
len -= l;
|
|
ret += l;
|
|
*size = ret;
|
|
return 0;
|
|
}
|