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src/lib/libcrypto/asn1/a_enum.c

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/* $OpenBSD: a_enum.c,v 1.29 2023/07/05 21:23:36 beck Exp $ */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young (eay@cryptsoft.com).
* 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 (tjh@cryptsoft.com).
*
* 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 (eay@cryptsoft.com)"
* 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 (tjh@cryptsoft.com)"
*
* 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 <limits.h>
#include <string.h>
#include <openssl/asn1.h>
#include <openssl/asn1t.h>
#include <openssl/bn.h>
#include <openssl/buffer.h>
#include <openssl/err.h>
#include "asn1_local.h"
#include "bytestring.h"
/*
* Code for ENUMERATED type: identical to INTEGER apart from a different tag.
* for comments on encoding see a_int.c
*/
const ASN1_ITEM ASN1_ENUMERATED_it = {
.itype = ASN1_ITYPE_PRIMITIVE,
.utype = V_ASN1_ENUMERATED,
.sname = "ASN1_ENUMERATED",
};
ASN1_ENUMERATED *
ASN1_ENUMERATED_new(void)
{
return (ASN1_ENUMERATED *)ASN1_item_new(&ASN1_ENUMERATED_it);
}
LCRYPTO_ALIAS(ASN1_ENUMERATED_new);
static void
asn1_aenum_clear(ASN1_ENUMERATED *aenum)
{
freezero(aenum->data, aenum->length);
memset(aenum, 0, sizeof(*aenum));
aenum->type = V_ASN1_ENUMERATED;
}
void
ASN1_ENUMERATED_free(ASN1_ENUMERATED *a)
{
ASN1_item_free((ASN1_VALUE *)a, &ASN1_ENUMERATED_it);
}
LCRYPTO_ALIAS(ASN1_ENUMERATED_free);
int
ASN1_ENUMERATED_get_int64(int64_t *out_val, const ASN1_ENUMERATED *aenum)
{
CBS cbs;
*out_val = 0;
if (aenum == NULL || aenum->length < 0)
return 0;
if (aenum->type != V_ASN1_ENUMERATED &&
aenum->type != V_ASN1_NEG_ENUMERATED) {
ASN1error(ASN1_R_WRONG_INTEGER_TYPE);
return 0;
}
CBS_init(&cbs, aenum->data, aenum->length);
return asn1_aint_get_int64(&cbs, (aenum->type == V_ASN1_NEG_ENUMERATED),
out_val);
}
LCRYPTO_ALIAS(ASN1_ENUMERATED_get_int64);
int
ASN1_ENUMERATED_set_int64(ASN1_ENUMERATED *aenum, int64_t val)
{
uint64_t uval;
asn1_aenum_clear(aenum);
uval = (uint64_t)val;
if (val < 0) {
aenum->type = V_ASN1_NEG_ENUMERATED;
uval = -uval;
}
return asn1_aint_set_uint64(uval, &aenum->data, &aenum->length);
}
LCRYPTO_ALIAS(ASN1_ENUMERATED_set_int64);
long
ASN1_ENUMERATED_get(const ASN1_ENUMERATED *aenum)
{
int64_t val;
if (aenum == NULL)
return 0;
if (!ASN1_ENUMERATED_get_int64(&val, aenum))
return -1;
if (val < LONG_MIN || val > LONG_MAX) {
/* hmm... a bit ugly, return all ones */
return -1;
}
return (long)val;
}
LCRYPTO_ALIAS(ASN1_ENUMERATED_get);
int
ASN1_ENUMERATED_set(ASN1_ENUMERATED *aenum, long val)
{
return ASN1_ENUMERATED_set_int64(aenum, val);
}
LCRYPTO_ALIAS(ASN1_ENUMERATED_set);
ASN1_ENUMERATED *
BN_to_ASN1_ENUMERATED(const BIGNUM *bn, ASN1_ENUMERATED *ai)
{
ASN1_ENUMERATED *ret;
int len, j;
if (ai == NULL)
ret = ASN1_ENUMERATED_new();
else
ret = ai;
if (ret == NULL) {
ASN1error(ERR_R_NESTED_ASN1_ERROR);
goto err;
}
if (BN_is_negative(bn))
ret->type = V_ASN1_NEG_ENUMERATED;
else
ret->type = V_ASN1_ENUMERATED;
j = BN_num_bits(bn);
len = ((j == 0) ? 0 : ((j / 8) + 1));
if (ret->length < len + 4) {
unsigned char *new_data = realloc(ret->data, len + 4);
if (!new_data) {
ASN1error(ERR_R_MALLOC_FAILURE);
goto err;
}
ret->data = new_data;
}
ret->length = BN_bn2bin(bn, ret->data);
/* Correct zero case */
if (!ret->length) {
ret->data[0] = 0;
ret->length = 1;
}
return (ret);
err:
if (ret != ai)
ASN1_ENUMERATED_free(ret);
return (NULL);
}
LCRYPTO_ALIAS(BN_to_ASN1_ENUMERATED);
BIGNUM *
ASN1_ENUMERATED_to_BN(const ASN1_ENUMERATED *ai, BIGNUM *bn)
{
BIGNUM *ret;
if ((ret = BN_bin2bn(ai->data, ai->length, bn)) == NULL)
ASN1error(ASN1_R_BN_LIB);
else if (ai->type == V_ASN1_NEG_ENUMERATED)
BN_set_negative(ret, 1);
return (ret);
}
LCRYPTO_ALIAS(ASN1_ENUMERATED_to_BN);
/* Based on a_int.c: equivalent ENUMERATED functions */
int
i2a_ASN1_ENUMERATED(BIO *bp, const ASN1_ENUMERATED *a)
{
int i, n = 0;
static const char h[] = "0123456789ABCDEF";
char buf[2];
if (a == NULL)
return (0);
if (a->length == 0) {
if (BIO_write(bp, "00", 2) != 2)
goto err;
n = 2;
} else {
for (i = 0; i < a->length; i++) {
if ((i != 0) && (i % 35 == 0)) {
if (BIO_write(bp, "\\\n", 2) != 2)
goto err;
n += 2;
}
buf[0] = h[((unsigned char)a->data[i] >> 4) & 0x0f];
buf[1] = h[((unsigned char)a->data[i]) & 0x0f];
if (BIO_write(bp, buf, 2) != 2)
goto err;
n += 2;
}
}
return (n);
err:
return (-1);
}
LCRYPTO_ALIAS(i2a_ASN1_ENUMERATED);
int
a2i_ASN1_ENUMERATED(BIO *bp, ASN1_ENUMERATED *bs, char *buf, int size)
{
int ret = 0;
int i, j,k, m,n, again, bufsize;
unsigned char *s = NULL, *sp;
unsigned char *bufp;
int first = 1;
size_t num = 0, slen = 0;
bs->type = V_ASN1_ENUMERATED;
bufsize = BIO_gets(bp, buf, size);
for (;;) {
if (bufsize < 1)
goto err_sl;
i = bufsize;
if (buf[i-1] == '\n')
buf[--i] = '\0';
if (i == 0)
goto err_sl;
if (buf[i-1] == '\r')
buf[--i] = '\0';
if (i == 0)
goto err_sl;
if (buf[i - 1] == '\\') {
i--;
again = 1;
} else
again = 0;
buf[i] = '\0';
if (i < 2)
goto err_sl;
bufp = (unsigned char *)buf;
if (first) {
first = 0;
if ((bufp[0] == '0') && (buf[1] == '0')) {
bufp += 2;
i -= 2;
}
}
k = 0;
if (i % 2 != 0) {
ASN1error(ASN1_R_ODD_NUMBER_OF_CHARS);
goto err;
}
i /= 2;
if (num + i > slen) {
sp = realloc(s, num + i);
if (sp == NULL) {
ASN1error(ERR_R_MALLOC_FAILURE);
goto err;
}
s = sp;
slen = num + i;
}
for (j = 0; j < i; j++, k += 2) {
for (n = 0; n < 2; n++) {
m = bufp[k + n];
if ((m >= '0') && (m <= '9'))
m -= '0';
else if ((m >= 'a') && (m <= 'f'))
m = m - 'a' + 10;
else if ((m >= 'A') && (m <= 'F'))
m = m - 'A' + 10;
else {
ASN1error(ASN1_R_NON_HEX_CHARACTERS);
goto err;
}
s[num + j] <<= 4;
s[num + j] |= m;
}
}
num += i;
if (again)
bufsize = BIO_gets(bp, buf, size);
else
break;
}
bs->length = num;
bs->data = s;
return (1);
err_sl:
ASN1error(ASN1_R_SHORT_LINE);
err:
free(s);
return (ret);
}
LCRYPTO_ALIAS(a2i_ASN1_ENUMERATED);
int
c2i_ASN1_ENUMERATED_cbs(ASN1_ENUMERATED **out_aenum, CBS *cbs)
{
ASN1_ENUMERATED *aenum = NULL;
if (out_aenum == NULL)
return 0;
if (*out_aenum != NULL) {
ASN1_INTEGER_free(*out_aenum);
*out_aenum = NULL;
}
if (!c2i_ASN1_INTEGER_cbs((ASN1_INTEGER **)&aenum, cbs))
return 0;
aenum->type = V_ASN1_ENUMERATED | (aenum->type & V_ASN1_NEG);
*out_aenum = aenum;
return 1;
}
int
i2d_ASN1_ENUMERATED(ASN1_ENUMERATED *a, unsigned char **out)
{
return ASN1_item_i2d((ASN1_VALUE *)a, out, &ASN1_ENUMERATED_it);
}
LCRYPTO_ALIAS(i2d_ASN1_ENUMERATED);
ASN1_ENUMERATED *
d2i_ASN1_ENUMERATED(ASN1_ENUMERATED **a, const unsigned char **in, long len)
{
return (ASN1_ENUMERATED *)ASN1_item_d2i((ASN1_VALUE **)a, in, len,
&ASN1_ENUMERATED_it);
}
LCRYPTO_ALIAS(d2i_ASN1_ENUMERATED);
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