249 lines
7.4 KiB
C
249 lines
7.4 KiB
C
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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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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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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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 the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.] */
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#include <openssl/asn1.h>
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#include <assert.h>
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#include <openssl/asn1t.h>
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#include <openssl/bio.h>
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#include <openssl/err.h>
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#include <openssl/mem.h>
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/* Experimental NDEF ASN1 BIO support routines */
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/* The usage is quite simple, initialize an ASN1 structure,
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* get a BIO from it then any data written through the BIO
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* will end up translated to approptiate format on the fly.
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* The data is streamed out and does *not* need to be
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* all held in memory at once.
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*
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* When the BIO is flushed the output is finalized and any
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* signatures etc written out.
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*
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* The BIO is a 'proper' BIO and can handle non blocking I/O
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* correctly.
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*
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* The usage is simple. The implementation is *not*...
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*/
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/* BIO support data stored in the ASN1 BIO ex_arg */
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typedef struct ndef_aux_st
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{
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/* ASN1 structure this BIO refers to */
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ASN1_VALUE *val;
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const ASN1_ITEM *it;
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/* Top of the BIO chain */
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BIO *ndef_bio;
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/* Output BIO */
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BIO *out;
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/* Boundary where content is inserted */
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unsigned char **boundary;
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/* DER buffer start */
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unsigned char *derbuf;
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} NDEF_SUPPORT;
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static int ndef_prefix(BIO *b, unsigned char **pbuf, int *plen, void *parg);
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static int ndef_prefix_free(BIO *b, unsigned char **pbuf, int *plen, void *parg);
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static int ndef_suffix(BIO *b, unsigned char **pbuf, int *plen, void *parg);
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static int ndef_suffix_free(BIO *b, unsigned char **pbuf, int *plen, void *parg);
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BIO *BIO_new_NDEF(BIO *out, ASN1_VALUE *val, const ASN1_ITEM *it)
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{
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NDEF_SUPPORT *ndef_aux = NULL;
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BIO *asn_bio = NULL;
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const ASN1_AUX *aux = it->funcs;
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ASN1_STREAM_ARG sarg;
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if (!aux || !aux->asn1_cb)
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{
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OPENSSL_PUT_ERROR(ASN1, BIO_new_NDEF, ASN1_R_STREAMING_NOT_SUPPORTED);
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return NULL;
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}
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ndef_aux = OPENSSL_malloc(sizeof(NDEF_SUPPORT));
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asn_bio = BIO_new(BIO_f_asn1());
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/* ASN1 bio needs to be next to output BIO */
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out = BIO_push(asn_bio, out);
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if (!ndef_aux || !asn_bio || !out)
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goto err;
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BIO_asn1_set_prefix(asn_bio, ndef_prefix, ndef_prefix_free);
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BIO_asn1_set_suffix(asn_bio, ndef_suffix, ndef_suffix_free);
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/* Now let callback prepend any digest, cipher etc BIOs
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* ASN1 structure needs.
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*/
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sarg.out = out;
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sarg.ndef_bio = NULL;
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sarg.boundary = NULL;
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if (aux->asn1_cb(ASN1_OP_STREAM_PRE, &val, it, &sarg) <= 0)
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goto err;
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ndef_aux->val = val;
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ndef_aux->it = it;
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ndef_aux->ndef_bio = sarg.ndef_bio;
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ndef_aux->boundary = sarg.boundary;
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ndef_aux->out = out;
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BIO_ctrl(asn_bio, BIO_C_SET_EX_ARG, 0, ndef_aux);
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return sarg.ndef_bio;
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err:
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if (asn_bio)
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BIO_free(asn_bio);
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if (ndef_aux)
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OPENSSL_free(ndef_aux);
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return NULL;
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}
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static int ndef_prefix(BIO *b, unsigned char **pbuf, int *plen, void *parg)
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{
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NDEF_SUPPORT *ndef_aux;
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unsigned char *p;
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int derlen;
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if (!parg)
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return 0;
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ndef_aux = *(NDEF_SUPPORT **)parg;
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derlen = ASN1_item_ndef_i2d(ndef_aux->val, NULL, ndef_aux->it);
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p = OPENSSL_malloc(derlen);
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ndef_aux->derbuf = p;
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*pbuf = p;
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derlen = ASN1_item_ndef_i2d(ndef_aux->val, &p, ndef_aux->it);
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if (!*ndef_aux->boundary)
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return 0;
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*plen = *ndef_aux->boundary - *pbuf;
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return 1;
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}
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static int ndef_prefix_free(BIO *b, unsigned char **pbuf, int *plen, void *parg)
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{
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NDEF_SUPPORT *ndef_aux;
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if (!parg)
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return 0;
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ndef_aux = *(NDEF_SUPPORT **)parg;
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if (ndef_aux->derbuf)
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OPENSSL_free(ndef_aux->derbuf);
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ndef_aux->derbuf = NULL;
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*pbuf = NULL;
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*plen = 0;
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return 1;
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}
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static int ndef_suffix_free(BIO *b, unsigned char **pbuf, int *plen, void *parg)
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{
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NDEF_SUPPORT **pndef_aux = (NDEF_SUPPORT **)parg;
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if (!ndef_prefix_free(b, pbuf, plen, parg))
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return 0;
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OPENSSL_free(*pndef_aux);
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*pndef_aux = NULL;
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return 1;
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}
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static int ndef_suffix(BIO *b, unsigned char **pbuf, int *plen, void *parg)
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{
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NDEF_SUPPORT *ndef_aux;
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unsigned char *p;
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int derlen;
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const ASN1_AUX *aux;
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ASN1_STREAM_ARG sarg;
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if (!parg)
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return 0;
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ndef_aux = *(NDEF_SUPPORT **)parg;
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aux = ndef_aux->it->funcs;
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/* Finalize structures */
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sarg.ndef_bio = ndef_aux->ndef_bio;
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sarg.out = ndef_aux->out;
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sarg.boundary = ndef_aux->boundary;
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if (aux->asn1_cb(ASN1_OP_STREAM_POST,
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&ndef_aux->val, ndef_aux->it, &sarg) <= 0)
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return 0;
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derlen = ASN1_item_ndef_i2d(ndef_aux->val, NULL, ndef_aux->it);
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p = OPENSSL_malloc(derlen);
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ndef_aux->derbuf = p;
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*pbuf = p;
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derlen = ASN1_item_ndef_i2d(ndef_aux->val, &p, ndef_aux->it);
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if (!*ndef_aux->boundary)
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return 0;
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*pbuf = *ndef_aux->boundary;
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*plen = derlen - (*ndef_aux->boundary - ndef_aux->derbuf);
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return 1;
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}
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