/* 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 = 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;

    ndef_aux->derbuf = NULL;

    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);

    if (!p)

        return 0;

    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);

    if (!p)

        return 0;

    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;

}