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153
openssl-1.0.2f/crypto/asn1/x_bignum.c
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153
openssl-1.0.2f/crypto/asn1/x_bignum.c
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/* x_bignum.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 BIGNUM handling. This reads in an ASN1_INTEGER
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* as a BIGNUM directly. Currently it ignores the sign which isn't a problem
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* since all BIGNUMs used are non negative and anything that looks negative
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* is normally due to an encoding error.
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*/
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#define BN_SENSITIVE 1
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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, 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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ASN1_ITEM_start(BIGNUM)
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ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &bignum_pf, 0, "BIGNUM"
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ASN1_ITEM_end(BIGNUM)
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ASN1_ITEM_start(CBIGNUM)
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ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &bignum_pf, BN_SENSITIVE, "BIGNUM"
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ASN1_ITEM_end(CBIGNUM)
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static int 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 bn_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
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{
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if (!*pval)
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return;
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if (it->size & BN_SENSITIVE)
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BN_clear_free((BIGNUM *)*pval);
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else
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BN_free((BIGNUM *)*pval);
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*pval = NULL;
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}
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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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{
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BIGNUM *bn;
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int pad;
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if (!*pval)
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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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BN_bn2bin(bn, cont);
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}
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return pad + BN_num_bytes(bn);
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}
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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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{
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BIGNUM *bn;
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if (*pval == NULL && !bn_new(pval, it))
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return 0;
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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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}
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