[331] | 1 | /*
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| 2 | * Copyright 2008-2016 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the OpenSSL license (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | #include <openssl/asn1.h>
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| 11 | #include <openssl/asn1t.h>
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| 12 | #include <openssl/bio.h>
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| 13 | #include <openssl/err.h>
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| 14 |
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| 15 | #include <stdio.h>
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| 16 |
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| 17 | /* Experimental NDEF ASN1 BIO support routines */
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| 18 |
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| 19 | /*
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| 20 | * The usage is quite simple, initialize an ASN1 structure, get a BIO from it
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| 21 | * then any data written through the BIO will end up translated to
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| 22 | * appropriate format on the fly. The data is streamed out and does *not*
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| 23 | * need to be all held in memory at once. When the BIO is flushed the output
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| 24 | * is finalized and any signatures etc written out. The BIO is a 'proper'
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| 25 | * BIO and can handle non blocking I/O correctly. The usage is simple. The
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| 26 | * implementation is *not*...
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| 27 | */
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| 28 |
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| 29 | /* BIO support data stored in the ASN1 BIO ex_arg */
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| 30 |
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| 31 | typedef struct ndef_aux_st {
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| 32 | /* ASN1 structure this BIO refers to */
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| 33 | ASN1_VALUE *val;
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| 34 | const ASN1_ITEM *it;
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| 35 | /* Top of the BIO chain */
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| 36 | BIO *ndef_bio;
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| 37 | /* Output BIO */
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| 38 | BIO *out;
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| 39 | /* Boundary where content is inserted */
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| 40 | unsigned char **boundary;
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| 41 | /* DER buffer start */
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| 42 | unsigned char *derbuf;
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| 43 | } NDEF_SUPPORT;
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| 44 |
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| 45 | static int ndef_prefix(BIO *b, unsigned char **pbuf, int *plen, void *parg);
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| 46 | static int ndef_prefix_free(BIO *b, unsigned char **pbuf, int *plen,
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| 47 | void *parg);
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| 48 | static int ndef_suffix(BIO *b, unsigned char **pbuf, int *plen, void *parg);
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| 49 | static int ndef_suffix_free(BIO *b, unsigned char **pbuf, int *plen,
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| 50 | void *parg);
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| 51 |
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| 52 | BIO *BIO_new_NDEF(BIO *out, ASN1_VALUE *val, const ASN1_ITEM *it)
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| 53 | {
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| 54 | NDEF_SUPPORT *ndef_aux = NULL;
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| 55 | BIO *asn_bio = NULL;
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| 56 | const ASN1_AUX *aux = it->funcs;
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| 57 | ASN1_STREAM_ARG sarg;
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| 58 |
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| 59 | if (!aux || !aux->asn1_cb) {
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| 60 | ASN1err(ASN1_F_BIO_NEW_NDEF, ASN1_R_STREAMING_NOT_SUPPORTED);
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| 61 | return NULL;
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| 62 | }
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| 63 | ndef_aux = OPENSSL_zalloc(sizeof(*ndef_aux));
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| 64 | asn_bio = BIO_new(BIO_f_asn1());
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| 65 | if (ndef_aux == NULL || asn_bio == NULL)
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| 66 | goto err;
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| 67 |
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| 68 | /* ASN1 bio needs to be next to output BIO */
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| 69 | out = BIO_push(asn_bio, out);
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| 70 | if (out == NULL)
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| 71 | goto err;
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| 72 |
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| 73 | BIO_asn1_set_prefix(asn_bio, ndef_prefix, ndef_prefix_free);
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| 74 | BIO_asn1_set_suffix(asn_bio, ndef_suffix, ndef_suffix_free);
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| 75 |
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| 76 | /*
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| 77 | * Now let callback prepends any digest, cipher etc BIOs ASN1 structure
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| 78 | * needs.
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| 79 | */
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| 80 |
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| 81 | sarg.out = out;
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| 82 | sarg.ndef_bio = NULL;
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| 83 | sarg.boundary = NULL;
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| 84 |
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| 85 | if (aux->asn1_cb(ASN1_OP_STREAM_PRE, &val, it, &sarg) <= 0)
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| 86 | goto err;
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| 87 |
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| 88 | ndef_aux->val = val;
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| 89 | ndef_aux->it = it;
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| 90 | ndef_aux->ndef_bio = sarg.ndef_bio;
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| 91 | ndef_aux->boundary = sarg.boundary;
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| 92 | ndef_aux->out = out;
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| 93 |
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| 94 | BIO_ctrl(asn_bio, BIO_C_SET_EX_ARG, 0, ndef_aux);
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| 95 |
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| 96 | return sarg.ndef_bio;
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| 97 |
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| 98 | err:
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| 99 | BIO_free(asn_bio);
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| 100 | OPENSSL_free(ndef_aux);
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| 101 | return NULL;
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| 102 | }
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| 103 |
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| 104 | static int ndef_prefix(BIO *b, unsigned char **pbuf, int *plen, void *parg)
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| 105 | {
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| 106 | NDEF_SUPPORT *ndef_aux;
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| 107 | unsigned char *p;
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| 108 | int derlen;
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| 109 |
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| 110 | if (!parg)
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| 111 | return 0;
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| 112 |
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| 113 | ndef_aux = *(NDEF_SUPPORT **)parg;
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| 114 |
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| 115 | derlen = ASN1_item_ndef_i2d(ndef_aux->val, NULL, ndef_aux->it);
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| 116 | p = OPENSSL_malloc(derlen);
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| 117 | if (p == NULL)
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| 118 | return 0;
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| 119 |
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| 120 | ndef_aux->derbuf = p;
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| 121 | *pbuf = p;
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| 122 | derlen = ASN1_item_ndef_i2d(ndef_aux->val, &p, ndef_aux->it);
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| 123 |
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| 124 | if (!*ndef_aux->boundary)
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| 125 | return 0;
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| 126 |
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| 127 | *plen = *ndef_aux->boundary - *pbuf;
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| 128 |
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| 129 | return 1;
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| 130 | }
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| 131 |
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| 132 | static int ndef_prefix_free(BIO *b, unsigned char **pbuf, int *plen,
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| 133 | void *parg)
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| 134 | {
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| 135 | NDEF_SUPPORT *ndef_aux;
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| 136 |
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| 137 | if (!parg)
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| 138 | return 0;
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| 139 |
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| 140 | ndef_aux = *(NDEF_SUPPORT **)parg;
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| 141 |
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| 142 | OPENSSL_free(ndef_aux->derbuf);
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| 143 |
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| 144 | ndef_aux->derbuf = NULL;
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| 145 | *pbuf = NULL;
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| 146 | *plen = 0;
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| 147 | return 1;
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| 148 | }
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| 149 |
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| 150 | static int ndef_suffix_free(BIO *b, unsigned char **pbuf, int *plen,
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| 151 | void *parg)
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| 152 | {
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| 153 | NDEF_SUPPORT **pndef_aux = (NDEF_SUPPORT **)parg;
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| 154 | if (!ndef_prefix_free(b, pbuf, plen, parg))
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| 155 | return 0;
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| 156 | OPENSSL_free(*pndef_aux);
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| 157 | *pndef_aux = NULL;
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| 158 | return 1;
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| 159 | }
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| 160 |
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| 161 | static int ndef_suffix(BIO *b, unsigned char **pbuf, int *plen, void *parg)
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| 162 | {
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| 163 | NDEF_SUPPORT *ndef_aux;
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| 164 | unsigned char *p;
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| 165 | int derlen;
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| 166 | const ASN1_AUX *aux;
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| 167 | ASN1_STREAM_ARG sarg;
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| 168 |
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| 169 | if (!parg)
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| 170 | return 0;
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| 171 |
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| 172 | ndef_aux = *(NDEF_SUPPORT **)parg;
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| 173 |
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| 174 | aux = ndef_aux->it->funcs;
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| 175 |
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| 176 | /* Finalize structures */
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| 177 | sarg.ndef_bio = ndef_aux->ndef_bio;
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| 178 | sarg.out = ndef_aux->out;
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| 179 | sarg.boundary = ndef_aux->boundary;
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| 180 | if (aux->asn1_cb(ASN1_OP_STREAM_POST,
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| 181 | &ndef_aux->val, ndef_aux->it, &sarg) <= 0)
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| 182 | return 0;
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| 183 |
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| 184 | derlen = ASN1_item_ndef_i2d(ndef_aux->val, NULL, ndef_aux->it);
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| 185 | p = OPENSSL_malloc(derlen);
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| 186 | if (p == NULL)
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| 187 | return 0;
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| 188 |
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| 189 | ndef_aux->derbuf = p;
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| 190 | *pbuf = p;
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| 191 | derlen = ASN1_item_ndef_i2d(ndef_aux->val, &p, ndef_aux->it);
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| 192 |
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| 193 | if (!*ndef_aux->boundary)
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| 194 | return 0;
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| 195 | *pbuf = *ndef_aux->boundary;
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| 196 | *plen = derlen - (*ndef_aux->boundary - ndef_aux->derbuf);
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| 197 |
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| 198 | return 1;
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| 199 | }
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