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bio_ndef.c
/* 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 */

00081 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 = OPENSSL_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)
            OPENSSL_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 = OPENSSL_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)
            OPENSSL_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;
      OPENSSL_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 = OPENSSL_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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