2 * Copyright 2008-2016 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
10 #include <openssl/asn1.h>
11 #include <openssl/asn1t.h>
12 #include <openssl/bio.h>
13 #include <openssl/err.h>
17 /* Experimental NDEF ASN1 BIO support routines */
20 * The usage is quite simple, initialize an ASN1 structure, get a BIO from it
21 * then any data written through the BIO will end up translated to
22 * appropriate format on the fly. The data is streamed out and does *not*
23 * need to be all held in memory at once. When the BIO is flushed the output
24 * is finalized and any signatures etc written out. The BIO is a 'proper'
25 * BIO and can handle non blocking I/O correctly. The usage is simple. The
26 * implementation is *not*...
29 /* BIO support data stored in the ASN1 BIO ex_arg */
31 typedef struct ndef_aux_st {
32 /* ASN1 structure this BIO refers to */
35 /* Top of the BIO chain */
39 /* Boundary where content is inserted */
40 unsigned char **boundary;
41 /* DER buffer start */
42 unsigned char *derbuf;
45 static int ndef_prefix(BIO *b, unsigned char **pbuf, int *plen, void *parg);
46 static int ndef_prefix_free(BIO *b, unsigned char **pbuf, int *plen,
48 static int ndef_suffix(BIO *b, unsigned char **pbuf, int *plen, void *parg);
49 static int ndef_suffix_free(BIO *b, unsigned char **pbuf, int *plen,
52 BIO *BIO_new_NDEF(BIO *out, ASN1_VALUE *val, const ASN1_ITEM *it)
54 NDEF_SUPPORT *ndef_aux = NULL;
56 const ASN1_AUX *aux = it->funcs;
59 if (!aux || !aux->asn1_cb) {
60 ASN1err(ASN1_F_BIO_NEW_NDEF, ASN1_R_STREAMING_NOT_SUPPORTED);
63 ndef_aux = OPENSSL_zalloc(sizeof(*ndef_aux));
64 asn_bio = BIO_new(BIO_f_asn1());
65 if (ndef_aux == NULL || asn_bio == NULL)
68 /* ASN1 bio needs to be next to output BIO */
69 out = BIO_push(asn_bio, out);
73 BIO_asn1_set_prefix(asn_bio, ndef_prefix, ndef_prefix_free);
74 BIO_asn1_set_suffix(asn_bio, ndef_suffix, ndef_suffix_free);
77 * Now let callback prepends any digest, cipher etc BIOs ASN1 structure
85 if (aux->asn1_cb(ASN1_OP_STREAM_PRE, &val, it, &sarg) <= 0)
90 ndef_aux->ndef_bio = sarg.ndef_bio;
91 ndef_aux->boundary = sarg.boundary;
94 BIO_ctrl(asn_bio, BIO_C_SET_EX_ARG, 0, ndef_aux);
100 OPENSSL_free(ndef_aux);
104 static int ndef_prefix(BIO *b, unsigned char **pbuf, int *plen, void *parg)
106 NDEF_SUPPORT *ndef_aux;
113 ndef_aux = *(NDEF_SUPPORT **)parg;
115 derlen = ASN1_item_ndef_i2d(ndef_aux->val, NULL, ndef_aux->it);
116 p = OPENSSL_malloc(derlen);
120 ndef_aux->derbuf = p;
122 derlen = ASN1_item_ndef_i2d(ndef_aux->val, &p, ndef_aux->it);
124 if (!*ndef_aux->boundary)
127 *plen = *ndef_aux->boundary - *pbuf;
132 static int ndef_prefix_free(BIO *b, unsigned char **pbuf, int *plen,
135 NDEF_SUPPORT *ndef_aux;
140 ndef_aux = *(NDEF_SUPPORT **)parg;
142 OPENSSL_free(ndef_aux->derbuf);
144 ndef_aux->derbuf = NULL;
150 static int ndef_suffix_free(BIO *b, unsigned char **pbuf, int *plen,
153 NDEF_SUPPORT **pndef_aux = (NDEF_SUPPORT **)parg;
154 if (!ndef_prefix_free(b, pbuf, plen, parg))
156 OPENSSL_free(*pndef_aux);
161 static int ndef_suffix(BIO *b, unsigned char **pbuf, int *plen, void *parg)
163 NDEF_SUPPORT *ndef_aux;
167 ASN1_STREAM_ARG sarg;
172 ndef_aux = *(NDEF_SUPPORT **)parg;
174 aux = ndef_aux->it->funcs;
176 /* Finalize structures */
177 sarg.ndef_bio = ndef_aux->ndef_bio;
178 sarg.out = ndef_aux->out;
179 sarg.boundary = ndef_aux->boundary;
180 if (aux->asn1_cb(ASN1_OP_STREAM_POST,
181 &ndef_aux->val, ndef_aux->it, &sarg) <= 0)
184 derlen = ASN1_item_ndef_i2d(ndef_aux->val, NULL, ndef_aux->it);
185 p = OPENSSL_malloc(derlen);
189 ndef_aux->derbuf = p;
191 derlen = ASN1_item_ndef_i2d(ndef_aux->val, &p, ndef_aux->it);
193 if (!*ndef_aux->boundary)
195 *pbuf = *ndef_aux->boundary;
196 *plen = derlen - (*ndef_aux->boundary - ndef_aux->derbuf);