GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: lib/libcrypto/asn1/x_long.c Lines: 34 45 75.6 %
Date: 2017-11-07 Branches: 20 28 71.4 %

Line Branch Exec Source
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/* $OpenBSD: x_long.c,v 1.11 2017/01/29 17:49:22 beck Exp $ */
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/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
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 * project 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 <string.h>
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#include <openssl/asn1t.h>
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#include <openssl/bn.h>
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#include <openssl/err.h>
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/* Custom primitive type for long handling. This converts between an ASN1_INTEGER
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 * 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, const ASN1_ITEM *it);
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static int long_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len, 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, 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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const ASN1_ITEM LONG_it = {
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	.itype = ASN1_ITYPE_PRIMITIVE,
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	.utype = V_ASN1_INTEGER,
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	.templates = NULL,
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	.tcount = 0,
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	.funcs = &long_pf,
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	.size = ASN1_LONG_UNDEF,
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	.sname = "LONG",
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};
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const ASN1_ITEM ZLONG_it = {
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	.itype = ASN1_ITYPE_PRIMITIVE,
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	.utype = V_ASN1_INTEGER,
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	.templates = NULL,
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	.tcount = 0,
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	.funcs = &long_pf,
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	.size = 0,
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	.sname = "ZLONG",
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};
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static int
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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
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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
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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(&ltmp, cp, sizeof(long));
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	if (ltmp == it->size)
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		return -1;
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	/* Convert the long to positive: we subtract one if negative so
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	 * we can cleanly handle the padding if only the MSB of the leading
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	 * octet is set.
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	 */
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	if (ltmp < 0)
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		utmp = -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
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long_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len, int utype,
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    char *free_cont, const ASN1_ITEM *it)
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{
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	int neg, 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 > (int)sizeof(long)) {
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		ASN1error(ASN1_R_INTEGER_TOO_LARGE_FOR_LONG);
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		return 0;
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	}
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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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	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++;
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		ltmp = -ltmp;
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	}
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	if (ltmp == it->size) {
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		ASN1error(ASN1_R_INTEGER_TOO_LARGE_FOR_LONG);
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		return 0;
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	}
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	memcpy(cp, &ltmp, sizeof(long));
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	return 1;
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}
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static int
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long_print(BIO *out, ASN1_VALUE **pval, const ASN1_ITEM *it, int indent,
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    const ASN1_PCTX *pctx)
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{
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	return BIO_printf(out, "%ld\n", *(long *)pval);
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}