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heimdal/lib/asn1/der_put.c

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/*
* Copyright (c) 1997-2005 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("$Id$");
/*
* 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.
*/
int ASN1CALL
der_put_unsigned (unsigned char *p, size_t len, const unsigned *v, size_t *size)
{
unsigned char *base = p;
unsigned val = *v;
*size = 0;
if (val) {
while (len > 0 && val) {
*p-- = val % 256;
val /= 256;
--len;
}
if (val != 0)
return ASN1_OVERFLOW;
else {
if(p[1] >= 128) {
if(len < 1)
return ASN1_OVERFLOW;
*p-- = 0;
}
*size = base - p;
return 0;
}
} else if (len < 1)
return ASN1_OVERFLOW;
else {
*p = 0;
*size = 1;
return 0;
}
}
int ASN1CALL
der_put_unsigned64 (unsigned char *p, size_t len, const uint64_t *v, size_t *size)
{
unsigned char *base = p;
uint64_t val = *v;
*size = 0;
if (val) {
while (len > 0 && val) {
*p-- = val % 256;
val /= 256;
--len;
}
if (val != 0)
return ASN1_OVERFLOW;
else {
if(p[1] >= 128) {
if(len < 1)
return ASN1_OVERFLOW;
*p-- = 0;
}
*size = base - p;
return 0;
}
} else if (len < 1)
return ASN1_OVERFLOW;
else {
*p = 0;
*size = 1;
return 0;
}
}
int ASN1CALL
der_put_integer (unsigned char *p, size_t len, const int *v, size_t *size)
{
unsigned char *base = p;
int val = *v;
*size = 0;
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 ASN1CALL
der_put_integer64 (unsigned char *p, size_t len, const int64_t *v, size_t *size)
{
unsigned char *base = p;
int64_t val = *v;
*size = 0;
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 ASN1CALL
der_put_length (unsigned char *p, size_t len, size_t val, size_t *size)
{
if (size)
*size = 0;
if (len < 1)
return ASN1_OVERFLOW;
if (val < 128) {
*p = val;
if (size)
*size = 1;
} else {
size_t l = 0;
while(val > 0) {
if(len < 2)
return ASN1_OVERFLOW;
*p-- = val % 256;
val /= 256;
len--;
l++;
}
*p = 0x80 | l;
if(size)
*size = l + 1;
}
return 0;
}
int ASN1CALL
der_put_boolean(unsigned char *p, size_t len, const int *data, size_t *size)
{
*size = 0;
if(len < 1)
return ASN1_OVERFLOW;
if(*data != 0)
*p = 0xff;
else
*p = 0;
*size = 1;
return 0;
}
int ASN1CALL
der_put_general_string (unsigned char *p, size_t len,
const heim_general_string *str, size_t *size)
{
size_t slen;
assert(p != NULL && str != NULL && *str != NULL && size != NULL);
*size = 0;
slen = strlen(*str);
if (len < slen)
return ASN1_OVERFLOW;
p -= slen;
memcpy (p+1, *str, slen);
*size = slen;
return 0;
}
int ASN1CALL
der_put_utf8string (unsigned char *p, size_t len,
const heim_utf8_string *str, size_t *size)
{
return der_put_general_string(p, len, str, size);
}
int ASN1CALL
der_put_printable_string (unsigned char *p, size_t len,
const heim_printable_string *str, size_t *size)
{
return der_put_octet_string(p, len, str, size);
}
int ASN1CALL
der_put_ia5_string (unsigned char *p, size_t len,
const heim_ia5_string *str, size_t *size)
{
return der_put_octet_string(p, len, str, size);
}
int ASN1CALL
der_put_bmp_string (unsigned char *p, size_t len,
const heim_bmp_string *data, size_t *size)
{
size_t i;
assert(p != NULL && data != NULL);
if (size)
*size = 0;
if (len / 2 < data->length)
return ASN1_OVERFLOW;
p -= data->length * 2;
for (i = 0; i < data->length; i++) {
p[1] = (data->data[i] >> 8) & 0xff;
p[2] = data->data[i] & 0xff;
p += 2;
}
if (size) *size = data->length * 2;
return 0;
}
int ASN1CALL
der_put_universal_string (unsigned char *p, size_t len,
const heim_universal_string *data, size_t *size)
{
size_t i;
if (size)
*size = 0;
if (len / 4 < data->length)
return ASN1_OVERFLOW;
p -= data->length * 4;
for (i = 0; i < data->length; i++) {
p[1] = (data->data[i] >> 24) & 0xff;
p[2] = (data->data[i] >> 16) & 0xff;
p[3] = (data->data[i] >> 8) & 0xff;
p[4] = data->data[i] & 0xff;
p += 4;
}
if (size) *size = data->length * 4;
return 0;
}
int ASN1CALL
der_put_visible_string (unsigned char *p, size_t len,
const heim_visible_string *str, size_t *size)
{
return der_put_general_string(p, len, str, size);
}
int ASN1CALL
der_put_octet_string (unsigned char *p, size_t len,
const heim_octet_string *data, size_t *size)
{
assert(p != NULL && data != NULL && size != NULL);
*size = 0;
if (len < data->length)
return ASN1_OVERFLOW;
p -= data->length;
if (data->length)
memcpy(p+1, data->data, data->length);
*size = data->length;
return 0;
}
int ASN1CALL
der_put_heim_integer (unsigned char *p, size_t len,
const heim_integer *data, size_t *size)
{
unsigned char *buf;
int hibitset = 0;
assert(p != NULL);
if (size)
*size = 0;
if (data->length == 0) {
if (len < 1)
return ASN1_OVERFLOW;
*p-- = 0;
if (size)
*size = 1;
return 0;
}
if (len < data->length)
return ASN1_OVERFLOW;
assert(data->data != NULL);
buf = data->data;
len -= data->length;
if (data->negative) {
ssize_t i;
int carry;
/*
* We represent the parsed integer as a positive value with a
* negativity flag. But we need to put it on the wire as the shortest
* twos-complement byte sequence possible. So we're going to negate
* the number as go.
*/
if (data->length == 1 && *(unsigned char *)data->data == 1) {
*(p--) = 0xff;
} else {
for (i = data->length - 1, carry = 1; i >= 0; i--) {
*p = buf[i] ^ 0xff;
if (carry)
carry = !++*p;
p--;
}
if (p[1] < 128) {
if (len < 1)
return ASN1_OVERFLOW;
*p-- = 0xff;
len--;
hibitset = 1;
}
}
} else {
p -= data->length;
memcpy(p + 1, buf, data->length);
if (p[1] >= 128) {
if (len < 1)
return ASN1_OVERFLOW;
p[0] = 0;
len--;
hibitset = 1;
}
}
if (size)
*size = data->length + hibitset;
return 0;
}
int ASN1CALL
der_put_generalized_time (unsigned char *p, size_t len,
const time_t *data, size_t *size)
{
heim_octet_string k;
size_t l;
int e;
e = _heim_time2generalizedtime (*data, &k, 1);
if (e)
return e;
e = der_put_octet_string(p, len, &k, &l);
free(k.data);
if(e)
return e;
if(size)
*size = l;
return 0;
}
int ASN1CALL
der_put_utctime (unsigned char *p, size_t len,
const time_t *data, size_t *size)
{
heim_octet_string k;
size_t l;
int e;
e = _heim_time2generalizedtime (*data, &k, 0);
if (e)
return e;
e = der_put_octet_string(p, len, &k, &l);
free(k.data);
if(e)
return e;
if(size)
*size = l;
return 0;
}
int ASN1CALL
der_put_oid (unsigned char *p, size_t len,
const heim_oid *data, size_t *size)
{
unsigned char *base = p;
size_t 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;
}
/*
* Output a copy of the DER TLV at `p' with a different outermost tag.
*
* This is used in the implementation of IMPLICIT tags in generated decoder
* functions.
*/
int ASN1CALL
der_replace_tag(const unsigned char *p, size_t len,
unsigned char **out, size_t *outlen,
Der_class class, Der_type type,
unsigned int tag)
{
Der_class found_class;
Der_type found_type;
unsigned int found_tag;
size_t payload_len, l, tag_len, len_len;
int e;
assert(p != NULL && out != NULL && outlen != NULL);
e = der_get_tag(p, len, &found_class, &found_type, &found_tag, &l);
if (e)
return e;
if (found_type != type)
return ASN1_TYPE_MISMATCH;
/* We don't care what found_class and found_tag are though */
tag_len = der_length_tag(tag);
p += l;
len -= l;
e = der_get_length(p, len, &payload_len, &len_len);
if (e)
return e;
if (payload_len > len)
return ASN1_OVERFLOW;
/*
* `p' now points at the payload; `*out' + the length of the tag points at
* where we should copy the DER length and the payload.
*/
if ((*out = malloc(*outlen = tag_len + len_len + payload_len)) == NULL)
return ENOMEM;
memcpy(*out + tag_len, p, len_len + payload_len);
/* Put the new tag */
e = der_put_tag(*out + tag_len - 1, tag_len, class, type, tag, &l);
if (e)
return e;
if (l != tag_len)
return ASN1_OVERFLOW;
return 0;
}
#if 0
int ASN1CALL
der_encode_implicit(unsigned char *p, size_t len,
asn1_generic_encoder_f encoder,
void *obj, size_t *size,
Der_type type,
unsigned int ttag, Der_class iclass, unsigned int itag)
{
size_t ttaglen = der_length_tag(ttag);
size_t itaglen = der_length_tag(itag);
size_t l;
unsigned char *p2;
int e;
assert(p != NULL && size != NULL);
/* Attempt to encode in place */
e = encoder(p, len, obj, size);
if (e == 0) {
/* Fits! Rewrite tag, adjust reported size. */
e = der_put_tag(p + ttaglen - 1, itaglen, iclass, type, itag, &l);
if (e == 0) {
(*size) -= ttaglen;
(*size) += itaglen;
}
return e;
}
if (e != ASN1_OVERFLOW || itaglen <= ttaglen)
return e;
/*
* Did not fit because ttaglen > itaglen and this was the last / only thing
* being encoded in a buffer of just the right size.
*/
if ((p2 = malloc(len + ttaglen - itaglen)) == NULL)
e = ENOMEM;
if (e == 0)
e = encoder(p2 + len + ttaglen - itaglen - 1, len + ttaglen - itaglen,
obj, size);
if (e == 0)
e = der_put_tag(p2 + ttaglen - 1, itaglen, iclass, type, itag, &l);
if (e == 0) {
(*size) -= ttaglen;
(*size) += itaglen;
memcpy(p - *size, p2 + ttaglen - itaglen, *size);
}
free(p2);
return e;
}
#endif
int ASN1CALL
der_put_tag (unsigned char *p, size_t len, Der_class class, Der_type type,
unsigned int tag, size_t *size)
{
if (tag <= 30) {
if (len < 1)
return ASN1_OVERFLOW;
*p = MAKE_TAG(class, type, tag);
*size = 1;
} else {
size_t ret = 0;
unsigned int continuation = 0;
do {
if (len < 1)
return ASN1_OVERFLOW;
*p-- = tag % 128 | continuation;
len--;
ret++;
tag /= 128;
continuation = 0x80;
} while(tag > 0);
if (len < 1)
return ASN1_OVERFLOW;
*p-- = MAKE_TAG(class, type, 0x1f);
ret++;
*size = ret;
}
return 0;
}
int ASN1CALL
der_put_length_and_tag (unsigned char *p, size_t len, size_t len_val,
Der_class class, Der_type type,
unsigned 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;
ret += l;
*size = ret;
return 0;
}
int
_heim_time2generalizedtime (time_t t, heim_octet_string *s, int gtimep)
{
struct tm tm;
const size_t len = gtimep ? 15 : 13;
int bytes;
s->data = NULL;
s->length = 0;
if (_der_gmtime(t, &tm) == NULL)
return ASN1_BAD_TIMEFORMAT;
s->data = malloc(len + 1);
if (s->data == NULL)
return ENOMEM;
s->length = len;
if (gtimep)
bytes = snprintf(s->data, len + 1, "%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);
else
bytes = snprintf(s->data, len + 1, "%02d%02d%02d%02d%02d%02dZ",
tm.tm_year % 100, tm.tm_mon + 1, tm.tm_mday,
tm.tm_hour, tm.tm_min, tm.tm_sec);
if (bytes > len)
abort();
return 0;
}
int ASN1CALL
der_put_bit_string (unsigned char *p, size_t len,
const heim_bit_string *data, size_t *size)
{
size_t data_size;
assert(p != NULL && data != NULL && size != NULL);
*size = 0;
data_size = (data->length + 7) / 8;
if (len < data_size + 1)
return ASN1_OVERFLOW;
p -= data_size + 1;
memcpy (p+2, data->data, data_size);
if (data->length && (data->length % 8) != 0)
p[1] = 8 - (data->length % 8);
else
p[1] = 0;
*size = data_size + 1;
return 0;
}
int
_heim_der_set_sort(const void *a1, const void *a2)
{
const heim_octet_string *s1, *s2;
int ret;
assert(a1 != NULL && a2 != NULL);
s1 = a1;
s2 = a2;
ret = memcmp(s1->data, s2->data,
s1->length < s2->length ? s1->length : s2->length);
if (ret != 0)
return ret;
return (int)(s1->length - s2->length);
}
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