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/* $OpenBSD: x_long.c,v 1.16 2019/04/20 11:13:15 jsing Exp $ */
/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
* project 2000.
*/
/* ====================================================================
* Copyright (c) 2000 The OpenSSL Project. 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. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* licensing@OpenSSL.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED 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 OpenSSL PROJECT OR
* ITS 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.
* ====================================================================
*
* This product includes cryptographic software written by Eric Young
* (eay@cryptsoft.com). This product includes software written by Tim
* Hudson (tjh@cryptsoft.com).
*
*/
#include <stdio.h>
#include <string.h>
#include <openssl/asn1t.h>
#include <openssl/bn.h>
#include <openssl/err.h>
/*
* Custom primitive type for long handling. This converts between an
* ASN1_INTEGER and a long directly.
*/
static int long_new(ASN1_VALUE **pval, const ASN1_ITEM *it);
static void long_free(ASN1_VALUE **pval, const ASN1_ITEM *it);
static int long_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype,
const ASN1_ITEM *it);
static int long_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,
int utype, char *free_cont, const ASN1_ITEM *it);
static int long_print(BIO *out, ASN1_VALUE **pval, const ASN1_ITEM *it,
int indent, const ASN1_PCTX *pctx);
static ASN1_PRIMITIVE_FUNCS long_pf = {
.app_data = NULL,
.flags = 0,
.prim_new = long_new,
.prim_free = long_free,
.prim_clear = long_free, /* Clear should set to initial value */
.prim_c2i = long_c2i,
.prim_i2c = long_i2c,
.prim_print = long_print,
};
const ASN1_ITEM LONG_it = {
.itype = ASN1_ITYPE_PRIMITIVE,
.utype = V_ASN1_INTEGER,
.templates = NULL,
.tcount = 0,
.funcs = &long_pf,
.size = ASN1_LONG_UNDEF,
.sname = "LONG",
};
const ASN1_ITEM ZLONG_it = {
.itype = ASN1_ITYPE_PRIMITIVE,
.utype = V_ASN1_INTEGER,
.templates = NULL,
.tcount = 0,
.funcs = &long_pf,
.size = 0,
.sname = "ZLONG",
};
static int
long_new(ASN1_VALUE **pval, const ASN1_ITEM *it)
{
*(long *)pval = it->size;
return 1;
}
static void
long_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
{
*(long *)pval = it->size;
}
static int
long_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype,
const ASN1_ITEM *it)
{
long ltmp;
unsigned long utmp;
int clen, pad, i;
/* this exists to bypass broken gcc optimization */
char *cp = (char *)pval;
/* use memcpy, because we may not be long aligned */
memcpy(<mp, cp, sizeof(long));
if (ltmp == it->size)
return -1;
/* Convert the long to positive: we subtract one if negative so
* we can cleanly handle the padding if only the MSB of the leading
* octet is set.
*/
if (ltmp < 0)
utmp = -(ltmp + 1);
else
utmp = ltmp;
clen = BN_num_bits_word(utmp);
/* If MSB of leading octet set we need to pad */
if (!(clen & 0x7))
pad = 1;
else
pad = 0;
/* Convert number of bits to number of octets */
clen = (clen + 7) >> 3;
if (cont) {
if (pad)
*cont++ = (ltmp < 0) ? 0xff : 0;
for (i = clen - 1; i >= 0; i--) {
cont[i] = (unsigned char)(utmp & 0xff);
if (ltmp < 0)
cont[i] ^= 0xff;
utmp >>= 8;
}
}
return clen + pad;
}
static int
long_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len, int utype,
char *free_cont, const ASN1_ITEM *it)
{
int neg, i;
long ltmp;
unsigned long utmp = 0;
char *cp = (char *)pval;
if (len > (int)sizeof(long)) {
ASN1error(ASN1_R_INTEGER_TOO_LARGE_FOR_LONG);
return 0;
}
/* Is it negative? */
if (len && (cont[0] & 0x80))
neg = 1;
else
neg = 0;
utmp = 0;
for (i = 0; i < len; i++) {
utmp <<= 8;
if (neg)
utmp |= cont[i] ^ 0xff;
else
utmp |= cont[i];
}
ltmp = (long)utmp;
if (neg) {
ltmp = -ltmp;
ltmp--;
}
if (ltmp == it->size) {
ASN1error(ASN1_R_INTEGER_TOO_LARGE_FOR_LONG);
return 0;
}
memcpy(cp, <mp, sizeof(long));
return 1;
}
static int
long_print(BIO *out, ASN1_VALUE **pval, const ASN1_ITEM *it, int indent,
const ASN1_PCTX *pctx)
{
if (BIO_printf(out, "%ld\n", *(long *)pval) <= 0)
return 0;
return 1;
}
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