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248 lines
7.3 KiB
248 lines
7.3 KiB
/* bio_ndef.c */ |
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/* |
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* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL |
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* project. |
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*/ |
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/* ==================================================================== |
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* Copyright (c) 2008 The OpenSSL Project. All rights reserved. |
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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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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* |
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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 |
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* the documentation and/or other materials provided with the |
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* distribution. |
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* |
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* 3. All advertising materials mentioning features or use of this |
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* software must display the following acknowledgment: |
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* "This product includes software developed by the OpenSSL Project |
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* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" |
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* |
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to |
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* endorse or promote products derived from this software without |
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* prior written permission. For written permission, please contact |
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* licensing@OpenSSL.org. |
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* |
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* 5. Products derived from this software may not be called "OpenSSL" |
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* nor may "OpenSSL" appear in their names without prior written |
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* permission of the OpenSSL Project. |
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* |
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* 6. Redistributions of any form whatsoever must retain the following |
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* acknowledgment: |
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* "This product includes software developed by the OpenSSL Project |
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* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY |
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR |
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
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* OF THE POSSIBILITY OF SUCH DAMAGE. |
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* ==================================================================== |
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* |
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*/ |
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#include <openssl/asn1.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 <stdio.h> |
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/* Experimental NDEF ASN1 BIO support routines */ |
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/* |
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* The usage is quite simple, initialize an ASN1 structure, get a BIO from it |
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* then any data written through the BIO will end up translated to |
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* approptiate format on the fly. The data is streamed out and does *not* |
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* need to be all held in memory at once. When the BIO is flushed the output |
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* is finalized and any signatures etc written out. The BIO is a 'proper' |
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* BIO and can handle non blocking I/O correctly. The usage is simple. The |
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* 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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/* 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, |
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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, |
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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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ASN1err(ASN1_F_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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/* |
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* Now let callback prepend any digest, cipher etc BIOs ASN1 structure |
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* 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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if (!p) |
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return 0; |
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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, |
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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, |
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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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if (!p) |
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return 0; |
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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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