219 lines
6.8 KiB
C
219 lines
6.8 KiB
C
/* x_long.c */
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/*
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* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
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* 2000.
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*/
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/* ====================================================================
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* Copyright (c) 2000 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* licensing@OpenSSL.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com).
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*
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*/
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#include <stdio.h>
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#include "cryptlib.h"
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#include <openssl/asn1t.h>
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#include <openssl/bn.h>
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/*
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* Custom primitive type for long handling. This converts between an
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* ASN1_INTEGER and a long directly.
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*/
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static int long_new(ASN1_VALUE **pval, const ASN1_ITEM *it);
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static void long_free(ASN1_VALUE **pval, const ASN1_ITEM *it);
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static int long_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype,
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const ASN1_ITEM *it);
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static int long_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,
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int utype, char *free_cont, const ASN1_ITEM *it);
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static int long_print(BIO *out, ASN1_VALUE **pval, const ASN1_ITEM *it,
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int indent, const ASN1_PCTX *pctx);
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static ASN1_PRIMITIVE_FUNCS long_pf = {
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NULL, 0,
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long_new,
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long_free,
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long_free, /* Clear should set to initial value */
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long_c2i,
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long_i2c,
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long_print
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};
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ASN1_ITEM_start(LONG)
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ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &long_pf, ASN1_LONG_UNDEF, "LONG"
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ASN1_ITEM_end(LONG)
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ASN1_ITEM_start(ZLONG)
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ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &long_pf, 0, "ZLONG"
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ASN1_ITEM_end(ZLONG)
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static int long_new(ASN1_VALUE **pval, const ASN1_ITEM *it)
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{
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*(long *)pval = it->size;
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return 1;
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}
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static void long_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
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{
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*(long *)pval = it->size;
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}
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static int long_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype,
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const ASN1_ITEM *it)
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{
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long ltmp;
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unsigned long utmp;
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int clen, pad, i;
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/* this exists to bypass broken gcc optimization */
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char *cp = (char *)pval;
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/* use memcpy, because we may not be long aligned */
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memcpy(<mp, cp, sizeof(long));
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if (ltmp == it->size)
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return -1;
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/*
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* Convert the long to positive: we subtract one if negative so we can
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* cleanly handle the padding if only the MSB of the leading octet is
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* set.
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*/
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if (ltmp < 0)
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utmp = 0 - (unsigned long)ltmp - 1;
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else
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utmp = ltmp;
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clen = BN_num_bits_word(utmp);
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/* If MSB of leading octet set we need to pad */
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if (!(clen & 0x7))
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pad = 1;
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else
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pad = 0;
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/* Convert number of bits to number of octets */
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clen = (clen + 7) >> 3;
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if (cont) {
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if (pad)
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*cont++ = (ltmp < 0) ? 0xff : 0;
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for (i = clen - 1; i >= 0; i--) {
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cont[i] = (unsigned char)(utmp & 0xff);
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if (ltmp < 0)
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cont[i] ^= 0xff;
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utmp >>= 8;
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}
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}
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return clen + pad;
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}
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static int long_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,
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int utype, char *free_cont, const ASN1_ITEM *it)
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{
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int neg = -1, i;
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long ltmp;
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unsigned long utmp = 0;
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char *cp = (char *)pval;
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if (len) {
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/*
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* Check possible pad byte. Worst case, we're skipping past actual
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* content, but since that's only with 0x00 and 0xff and we set neg
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* accordingly, the result will be correct in the end anyway.
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*/
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switch (cont[0]) {
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case 0xff:
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cont++;
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len--;
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neg = 1;
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break;
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case 0:
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cont++;
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len--;
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neg = 0;
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break;
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}
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}
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if (len > (int)sizeof(long)) {
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ASN1err(ASN1_F_LONG_C2I, ASN1_R_INTEGER_TOO_LARGE_FOR_LONG);
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return 0;
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}
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if (neg == -1) {
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/* Is it negative? */
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if (len && (cont[0] & 0x80))
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neg = 1;
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else
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neg = 0;
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}
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utmp = 0;
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for (i = 0; i < len; i++) {
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utmp <<= 8;
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if (neg)
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utmp |= cont[i] ^ 0xff;
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else
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utmp |= cont[i];
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}
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ltmp = (long)utmp;
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if (neg) {
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ltmp = -ltmp;
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ltmp--;
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}
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if (ltmp == it->size) {
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ASN1err(ASN1_F_LONG_C2I, ASN1_R_INTEGER_TOO_LARGE_FOR_LONG);
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return 0;
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}
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memcpy(cp, <mp, sizeof(long));
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return 1;
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}
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static int long_print(BIO *out, ASN1_VALUE **pval, const ASN1_ITEM *it,
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int indent, const ASN1_PCTX *pctx)
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{
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return BIO_printf(out, "%ld\n", *(long *)pval);
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}
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