GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: lib/libcrypto/asn1/x_bignum.c Lines: 26 31 83.9 %
Date: 2017-11-13 Branches: 13 18 72.2 %

Line Branch Exec Source
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/* $OpenBSD: x_bignum.c,v 1.8 2015/07/25 17:07:17 jsing 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 <openssl/asn1t.h>
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#include <openssl/bn.h>
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/*
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 * Custom primitive type for BIGNUM handling. This reads in an ASN1_INTEGER as a
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 * BIGNUM directly. Currently it ignores the sign which isn't a problem since
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 * all BIGNUMs used are non negative and anything that looks negative is
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 * normally due to an encoding error.
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 */
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static int bn_new(ASN1_VALUE **pval, const ASN1_ITEM *it);
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static void bn_free(ASN1_VALUE **pval, const ASN1_ITEM *it);
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static int bn_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype,
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    const ASN1_ITEM *it);
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static int bn_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 ASN1_PRIMITIVE_FUNCS bignum_pf = {
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	NULL,
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	0,
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	bn_new,
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	bn_free,
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	0,
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	bn_c2i,
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	bn_i2c
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};
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const ASN1_ITEM BIGNUM_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 = &bignum_pf,
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        .size = 0,
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        .sname = "BIGNUM",
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};
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const ASN1_ITEM CBIGNUM_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 = &bignum_pf,
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        .size = 0,
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        .sname = "BIGNUM",
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};
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static int
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bn_new(ASN1_VALUE **pval, const ASN1_ITEM *it)
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{
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	*pval = (ASN1_VALUE *)BN_new();
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	if (*pval)
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		return 1;
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	else
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		return 0;
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}
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static void
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bn_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
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{
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	if (*pval == NULL)
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		return;
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	BN_clear_free((BIGNUM *)*pval);
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	*pval = NULL;
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}
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static int
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bn_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype, const ASN1_ITEM *it)
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{
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	BIGNUM *bn;
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	int pad, len;
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	if (*pval == NULL)
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		return -1;
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	bn = (BIGNUM *)*pval;
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	/* If MSB set in an octet we need a padding byte */
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	if (BN_num_bits(bn) & 0x7)
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		pad = 0;
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	else
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		pad = 1;
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	if (cont) {
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		if (pad)
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			*cont++ = 0;
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		len = BN_bn2bin(bn, cont);
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	} else
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		len = BN_num_bytes(bn);
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	return pad + len;
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}
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static int
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bn_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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	BIGNUM *bn;
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	if (*pval == NULL) {
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		if (bn_new(pval, it) == 0)
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			return 0;
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	}
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	bn = (BIGNUM *)*pval;
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	if (!BN_bin2bn(cont, len, bn)) {
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		bn_free(pval, it);
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		return 0;
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	}
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	return 1;
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}