ref: 4410517b44fd2610abe0dcd1349bb3e6b3c5ddb8
dir: /sys/src/ape/lib/openssl/crypto/asn1/x_long.c/
/* x_long.c */
/* Written by Dr Stephen N Henson ([email protected]) 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
* [email protected].
*
* 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
* ([email protected]). This product includes software written by Tim
* Hudson ([email protected]).
*
*/
#include <stdio.h>
#include "cryptlib.h"
#include <openssl/asn1t.h>
#include <openssl/bn.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 ASN1_PRIMITIVE_FUNCS long_pf = {
NULL, 0,
long_new,
long_free,
long_free, /* Clear should set to initial value */
long_c2i,
long_i2c
};
ASN1_ITEM_start(LONG)
ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &long_pf, ASN1_LONG_UNDEF, "LONG"
ASN1_ITEM_end(LONG)
ASN1_ITEM_start(ZLONG)
ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &long_pf, 0, "ZLONG"
ASN1_ITEM_end(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)) {
ASN1err(ASN1_F_LONG_C2I, 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) {
ASN1err(ASN1_F_LONG_C2I, ASN1_R_INTEGER_TOO_LARGE_FOR_LONG);
return 0;
}
memcpy(cp, <mp, sizeof(long));
return 1;
}