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/* $OpenBSD: x_bignum.c,v 1.12 2022/07/30 13:42:25 jsing Exp $ */
/* Written by Dr Stephen N Henson (steve@openssl.org) 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
* licensing@OpenSSL.org.
*
* 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
* (eay@cryptsoft.com). This product includes software written by Tim
* Hudson (tjh@cryptsoft.com).
*
*/
#include <stdio.h>
#include <openssl/asn1t.h>
#include <openssl/bn.h>
#include "asn1_locl.h"
#include "bytestring.h"
/*
* Custom primitive type for that reads an ASN.1 INTEGER into a BIGNUM.
*/
static int bn_new(ASN1_VALUE **pval, const ASN1_ITEM *it);
static void bn_free(ASN1_VALUE **pval, const ASN1_ITEM *it);
static void bn_clear(ASN1_VALUE **pval, const ASN1_ITEM *it);
static int bn_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype,
const ASN1_ITEM *it);
static int bn_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,
int utype, char *free_cont, const ASN1_ITEM *it);
static int bn_print(BIO *out, ASN1_VALUE **pval, const ASN1_ITEM *it,
int indent, const ASN1_PCTX *pctx);
static ASN1_PRIMITIVE_FUNCS bignum_pf = {
.app_data = NULL,
.flags = 0,
.prim_new = bn_new,
.prim_free = bn_free,
.prim_clear = bn_clear,
.prim_c2i = bn_c2i,
.prim_i2c = bn_i2c,
.prim_print = bn_print,
};
const ASN1_ITEM BIGNUM_it = {
.itype = ASN1_ITYPE_PRIMITIVE,
.utype = V_ASN1_INTEGER,
.templates = NULL,
.tcount = 0,
.funcs = &bignum_pf,
.size = 0,
.sname = "BIGNUM",
};
const ASN1_ITEM CBIGNUM_it = {
.itype = ASN1_ITYPE_PRIMITIVE,
.utype = V_ASN1_INTEGER,
.templates = NULL,
.tcount = 0,
.funcs = &bignum_pf,
.size = 0,
.sname = "BIGNUM",
};
static int
bn_new(ASN1_VALUE **pval, const ASN1_ITEM *it)
{
if ((*pval = (ASN1_VALUE *)BN_new()) == NULL)
return 0;
return 1;
}
static void
bn_clear(ASN1_VALUE **pval, const ASN1_ITEM *it)
{
BN_free((BIGNUM *)*pval);
*pval = NULL;
}
static void
bn_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
{
if (*pval == NULL)
return;
bn_clear(pval, it);
}
static int
bn_i2c(ASN1_VALUE **pval, unsigned char *content, int *putype, const ASN1_ITEM *it)
{
ASN1_INTEGER *aint = NULL;
unsigned char **pp = NULL;
const BIGNUM *bn;
int ret;
if (*pval == NULL)
return -1;
bn = (const BIGNUM *)*pval;
if ((aint = BN_to_ASN1_INTEGER(bn, NULL)) == NULL)
return -1;
if (content != NULL)
pp = &content;
ret = i2c_ASN1_INTEGER(aint, pp);
ASN1_INTEGER_free(aint);
return ret;
}
static int
bn_c2i(ASN1_VALUE **pval, const unsigned char *content, int len, int utype,
char *free_content, const ASN1_ITEM *it)
{
ASN1_INTEGER *aint = NULL;
BIGNUM *bn;
CBS cbs;
int ret = 0;
bn_clear(pval, it);
if (len < 0)
goto err;
CBS_init(&cbs, content, len);
if (!c2i_ASN1_INTEGER_cbs(&aint, &cbs))
goto err;
if ((bn = ASN1_INTEGER_to_BN(aint, NULL)) == NULL)
goto err;
*pval = (ASN1_VALUE *)bn;
ret = 1;
err:
ASN1_INTEGER_free(aint);
return ret;
}
static int
bn_print(BIO *out, ASN1_VALUE **pval, const ASN1_ITEM *it, int indent,
const ASN1_PCTX *pctx)
{
const BIGNUM *bn = (BIGNUM *)*pval;
if (!BN_print(out, bn))
return 0;
if (BIO_printf(out, "\n") <= 0)
return 0;
return 1;
}
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