2 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
5 /* ====================================================================
6 * Copyright (c) 2008 The OpenSSL Project. All rights reserved.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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13 * notice, this list of conditions and the following disclaimer.
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21 * software must display the following acknowledgment:
22 * "This product includes software developed by the OpenSSL Project
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36 * "This product includes software developed by the OpenSSL Project
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51 * ====================================================================
55 #include <openssl/asn1.h>
56 #include <openssl/asn1t.h>
57 #include <openssl/bio.h>
58 #include <openssl/err.h>
62 /* Experimental NDEF ASN1 BIO support routines */
65 * The usage is quite simple, initialize an ASN1 structure, get a BIO from it
66 * then any data written through the BIO will end up translated to
67 * approptiate format on the fly. The data is streamed out and does *not*
68 * need to be all held in memory at once. When the BIO is flushed the output
69 * is finalized and any signatures etc written out. The BIO is a 'proper'
70 * BIO and can handle non blocking I/O correctly. The usage is simple. The
71 * implementation is *not*...
74 /* BIO support data stored in the ASN1 BIO ex_arg */
76 typedef struct ndef_aux_st {
77 /* ASN1 structure this BIO refers to */
80 /* Top of the BIO chain */
84 /* Boundary where content is inserted */
85 unsigned char **boundary;
86 /* DER buffer start */
87 unsigned char *derbuf;
90 static int ndef_prefix(BIO *b, unsigned char **pbuf, int *plen, void *parg);
91 static int ndef_prefix_free(BIO *b, unsigned char **pbuf, int *plen,
93 static int ndef_suffix(BIO *b, unsigned char **pbuf, int *plen, void *parg);
94 static int ndef_suffix_free(BIO *b, unsigned char **pbuf, int *plen,
97 BIO *BIO_new_NDEF(BIO *out, ASN1_VALUE *val, const ASN1_ITEM *it)
99 NDEF_SUPPORT *ndef_aux = NULL;
101 const ASN1_AUX *aux = it->funcs;
102 ASN1_STREAM_ARG sarg;
104 if (!aux || !aux->asn1_cb) {
105 ASN1err(ASN1_F_BIO_NEW_NDEF, ASN1_R_STREAMING_NOT_SUPPORTED);
108 ndef_aux = OPENSSL_malloc(sizeof(*ndef_aux));
109 asn_bio = BIO_new(BIO_f_asn1());
111 /* ASN1 bio needs to be next to output BIO */
113 out = BIO_push(asn_bio, out);
115 if (ndef_aux == NULL || asn_bio == NULL || !out)
118 BIO_asn1_set_prefix(asn_bio, ndef_prefix, ndef_prefix_free);
119 BIO_asn1_set_suffix(asn_bio, ndef_suffix, ndef_suffix_free);
122 * Now let callback prepend any digest, cipher etc BIOs ASN1 structure
127 sarg.ndef_bio = NULL;
128 sarg.boundary = NULL;
130 if (aux->asn1_cb(ASN1_OP_STREAM_PRE, &val, it, &sarg) <= 0)
135 ndef_aux->ndef_bio = sarg.ndef_bio;
136 ndef_aux->boundary = sarg.boundary;
139 BIO_ctrl(asn_bio, BIO_C_SET_EX_ARG, 0, ndef_aux);
141 return sarg.ndef_bio;
145 OPENSSL_free(ndef_aux);
149 static int ndef_prefix(BIO *b, unsigned char **pbuf, int *plen, void *parg)
151 NDEF_SUPPORT *ndef_aux;
158 ndef_aux = *(NDEF_SUPPORT **)parg;
160 derlen = ASN1_item_ndef_i2d(ndef_aux->val, NULL, ndef_aux->it);
161 p = OPENSSL_malloc(derlen);
165 ndef_aux->derbuf = p;
167 derlen = ASN1_item_ndef_i2d(ndef_aux->val, &p, ndef_aux->it);
169 if (!*ndef_aux->boundary)
172 *plen = *ndef_aux->boundary - *pbuf;
177 static int ndef_prefix_free(BIO *b, unsigned char **pbuf, int *plen,
180 NDEF_SUPPORT *ndef_aux;
185 ndef_aux = *(NDEF_SUPPORT **)parg;
187 OPENSSL_free(ndef_aux->derbuf);
189 ndef_aux->derbuf = NULL;
195 static int ndef_suffix_free(BIO *b, unsigned char **pbuf, int *plen,
198 NDEF_SUPPORT **pndef_aux = (NDEF_SUPPORT **)parg;
199 if (!ndef_prefix_free(b, pbuf, plen, parg))
201 OPENSSL_free(*pndef_aux);
206 static int ndef_suffix(BIO *b, unsigned char **pbuf, int *plen, void *parg)
208 NDEF_SUPPORT *ndef_aux;
212 ASN1_STREAM_ARG sarg;
217 ndef_aux = *(NDEF_SUPPORT **)parg;
219 aux = ndef_aux->it->funcs;
221 /* Finalize structures */
222 sarg.ndef_bio = ndef_aux->ndef_bio;
223 sarg.out = ndef_aux->out;
224 sarg.boundary = ndef_aux->boundary;
225 if (aux->asn1_cb(ASN1_OP_STREAM_POST,
226 &ndef_aux->val, ndef_aux->it, &sarg) <= 0)
229 derlen = ASN1_item_ndef_i2d(ndef_aux->val, NULL, ndef_aux->it);
230 p = OPENSSL_malloc(derlen);
234 ndef_aux->derbuf = p;
236 derlen = ASN1_item_ndef_i2d(ndef_aux->val, &p, ndef_aux->it);
238 if (!*ndef_aux->boundary)
240 *pbuf = *ndef_aux->boundary;
241 *plen = derlen - (*ndef_aux->boundary - ndef_aux->derbuf);