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/* bio_ndef.c */
/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
* project.
*/
/* ====================================================================
* Copyright (c) 2008 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.
* ====================================================================
*
*/
#include <openssl/asn1.h>
#include <openssl/asn1t.h>
#include <openssl/bio.h>
#include <openssl/err.h>
#include <stdio.h>
/* Experimental NDEF ASN1 BIO support routines */
/* The usage is quite simple, initialize an ASN1 structure,
* get a BIO from it then any data written through the BIO
* will end up translated to approptiate format on the fly.
* The data is streamed out and does *not* need to be
* all held in memory at once.
*
* When the BIO is flushed the output is finalized and any
* signatures etc written out.
*
* The BIO is a 'proper' BIO and can handle non blocking I/O
* correctly.
*
* The usage is simple. The implementation is *not*...
*/
/* BIO support data stored in the ASN1 BIO ex_arg */
typedef struct ndef_aux_st {
/* ASN1 structure this BIO refers to */
ASN1_VALUE *val;
const ASN1_ITEM *it;
/* Top of the BIO chain */
BIO *ndef_bio;
/* Output BIO */
BIO *out;
/* Boundary where content is inserted */
unsigned char **boundary;
/* DER buffer start */
unsigned char *derbuf;
} NDEF_SUPPORT;
static int ndef_prefix(BIO *b, unsigned char **pbuf, int *plen, void *parg);
static int ndef_prefix_free(BIO *b, unsigned char **pbuf, int *plen, void *parg);
static int ndef_suffix(BIO *b, unsigned char **pbuf, int *plen, void *parg);
static int ndef_suffix_free(BIO *b, unsigned char **pbuf, int *plen, void *parg);
BIO *
BIO_new_NDEF(BIO *out, ASN1_VALUE *val, const ASN1_ITEM *it)
{
NDEF_SUPPORT *ndef_aux = NULL;
BIO *asn_bio = NULL;
const ASN1_AUX *aux = it->funcs;
ASN1_STREAM_ARG sarg;
if (!aux || !aux->asn1_cb) {
ASN1err(ASN1_F_BIO_NEW_NDEF, ASN1_R_STREAMING_NOT_SUPPORTED);
return NULL;
}
ndef_aux = malloc(sizeof(NDEF_SUPPORT));
asn_bio = BIO_new(BIO_f_asn1());
/* ASN1 bio needs to be next to output BIO */
out = BIO_push(asn_bio, out);
if (!ndef_aux || !asn_bio || !out)
goto err;
BIO_asn1_set_prefix(asn_bio, ndef_prefix, ndef_prefix_free);
BIO_asn1_set_suffix(asn_bio, ndef_suffix, ndef_suffix_free);
/* Now let callback prepend any digest, cipher etc BIOs
* ASN1 structure needs.
*/
sarg.out = out;
sarg.ndef_bio = NULL;
sarg.boundary = NULL;
if (aux->asn1_cb(ASN1_OP_STREAM_PRE, &val, it, &sarg) <= 0)
goto err;
ndef_aux->val = val;
ndef_aux->it = it;
ndef_aux->ndef_bio = sarg.ndef_bio;
ndef_aux->boundary = sarg.boundary;
ndef_aux->out = out;
BIO_ctrl(asn_bio, BIO_C_SET_EX_ARG, 0, ndef_aux);
return sarg.ndef_bio;
err:
if (asn_bio)
BIO_free(asn_bio);
if (ndef_aux)
free(ndef_aux);
return NULL;
}
static int
ndef_prefix(BIO *b, unsigned char **pbuf, int *plen, void *parg)
{
NDEF_SUPPORT *ndef_aux;
unsigned char *p;
int derlen;
if (!parg)
return 0;
ndef_aux = *(NDEF_SUPPORT **)parg;
derlen = ASN1_item_ndef_i2d(ndef_aux->val, NULL, ndef_aux->it);
p = malloc(derlen);
ndef_aux->derbuf = p;
*pbuf = p;
derlen = ASN1_item_ndef_i2d(ndef_aux->val, &p, ndef_aux->it);
if (!*ndef_aux->boundary)
return 0;
*plen = *ndef_aux->boundary - *pbuf;
return 1;
}
static int
ndef_prefix_free(BIO *b, unsigned char **pbuf, int *plen, void *parg)
{
NDEF_SUPPORT *ndef_aux;
if (!parg)
return 0;
ndef_aux = *(NDEF_SUPPORT **)parg;
if (ndef_aux->derbuf)
free(ndef_aux->derbuf);
ndef_aux->derbuf = NULL;
*pbuf = NULL;
*plen = 0;
return 1;
}
static int
ndef_suffix_free(BIO *b, unsigned char **pbuf, int *plen, void *parg)
{
NDEF_SUPPORT **pndef_aux = (NDEF_SUPPORT **)parg;
if (!ndef_prefix_free(b, pbuf, plen, parg))
return 0;
free(*pndef_aux);
*pndef_aux = NULL;
return 1;
}
static int
ndef_suffix(BIO *b, unsigned char **pbuf, int *plen, void *parg)
{
NDEF_SUPPORT *ndef_aux;
unsigned char *p;
int derlen;
const ASN1_AUX *aux;
ASN1_STREAM_ARG sarg;
if (!parg)
return 0;
ndef_aux = *(NDEF_SUPPORT **)parg;
aux = ndef_aux->it->funcs;
/* Finalize structures */
sarg.ndef_bio = ndef_aux->ndef_bio;
sarg.out = ndef_aux->out;
sarg.boundary = ndef_aux->boundary;
if (aux->asn1_cb(ASN1_OP_STREAM_POST,
&ndef_aux->val, ndef_aux->it, &sarg) <= 0)
return 0;
derlen = ASN1_item_ndef_i2d(ndef_aux->val, NULL, ndef_aux->it);
p = malloc(derlen);
ndef_aux->derbuf = p;
*pbuf = p;
derlen = ASN1_item_ndef_i2d(ndef_aux->val, &p, ndef_aux->it);
if (!*ndef_aux->boundary)
return 0;
*pbuf = *ndef_aux->boundary;
*plen = derlen - (*ndef_aux->boundary - ndef_aux->derbuf);
return 1;
}
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