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openssl/crypto/asn1/bio_ndef.c

Index: openssl/crypto/asn1/bio_ndef.c
===================================================================
--- openssl/crypto/asn1/bio_ndef.c	(revision 0)
+++ openssl/crypto/asn1/bio_ndef.c	(revision 0)
@@ -0,0 +1,243 @@
+/* bio_ndef.c */
+/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
+ * project.
+ */
+/* ====================================================================
+ * Copyright (c) 2008 The OpenSSL Project.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer. 
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * 3. All advertising materials mentioning features or use of this
+ *    software must display the following acknowledgment:
+ *    "This product includes software developed by the OpenSSL Project
+ *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
+ *
+ * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
+ *    endorse or promote products derived from this software without
+ *    prior written permission. For written permission, please contact
+ *    licensing@OpenSSL.org.
+ *
+ * 5. Products derived from this software may not be called "OpenSSL"
+ *    nor may "OpenSSL" appear in their names without prior written
+ *    permission of the OpenSSL Project.
+ *
+ * 6. Redistributions of any form whatsoever must retain the following
+ *    acknowledgment:
+ *    "This product includes software developed by the OpenSSL Project
+ *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
+ * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ * ====================================================================
+ *
+ */
+
+#include <openssl/asn1.h>
+#include <openssl/asn1t.h>
+#include <openssl/bio.h>
+#include <openssl/err.h>
+
+#include <stdio.h>
+
+/* Experimental NDEF ASN1 BIO support routines */
+
+/* The usage is quite simple, initialize an ASN1 structure,
+ * get a BIO from it then any data written through the BIO
+ * will end up translated to approptiate format on the fly.
+ * The data is streamed out and does *not* need to be
+ * all held in memory at once.
+ *
+ * When the BIO is flushed the output is finalized and any
+ * signatures etc written out.
+ *
+ * The BIO is a 'proper' BIO and can handle non blocking I/O
+ * correctly.
+ *
+ * The usage is simple. The implementation is *not*...
+ */
+
+/* BIO support data stored in the ASN1 BIO ex_arg */
+
+typedef struct ndef_aux_st
+	{
+	/* ASN1 structure this BIO refers to */
+	ASN1_VALUE *val;
+	const ASN1_ITEM *it;
+	/* Top of the BIO chain */
+	BIO *ndef_bio;
+	/* Output BIO */
+	BIO *out;
+	/* Boundary where content is inserted */
+	unsigned char **boundary;
+	/* DER buffer start */
+	unsigned char *derbuf;
+	} NDEF_SUPPORT;
+
+static int ndef_prefix(BIO *b, unsigned char **pbuf, int *plen, void *parg);
+static int ndef_prefix_free(BIO *b, unsigned char **pbuf, int *plen, void *parg);
+static int ndef_suffix(BIO *b, unsigned char **pbuf, int *plen, void *parg);
+static int ndef_suffix_free(BIO *b, unsigned char **pbuf, int *plen, void *parg);
+
+BIO *BIO_new_NDEF(BIO *out, ASN1_VALUE *val, const ASN1_ITEM *it)
+	{
+	NDEF_SUPPORT *ndef_aux = NULL;
+	BIO *asn_bio = NULL;
+	const ASN1_AUX *aux = it->funcs;
+	ASN1_STREAM_ARG sarg;
+
+	if (!aux || !aux->asn1_cb)
+		{
+		ASN1err(ASN1_F_BIO_NEW_NDEF, ASN1_R_STREAMING_NOT_SUPPORTED);
+		return NULL;
+		}
+	ndef_aux = OPENSSL_malloc(sizeof(NDEF_SUPPORT));
+	asn_bio = BIO_new(BIO_f_asn1());
+
+	/* ASN1 bio needs to be next to output BIO */
+
+	out = BIO_push(asn_bio, out);
+
+	if (!ndef_aux || !asn_bio || !out)
+		goto err;
+
+	BIO_asn1_set_prefix(asn_bio, ndef_prefix, ndef_prefix_free);
+	BIO_asn1_set_suffix(asn_bio, ndef_suffix, ndef_suffix_free);
+
+	/* Now let callback prepend any digest, cipher etc BIOs
+	 * ASN1 structure needs.
+	 */
+
+	sarg.out = out;
+	sarg.ndef_bio = NULL;
+	sarg.boundary = NULL;
+
+	if (aux->asn1_cb(ASN1_OP_STREAM_PRE, &val, it, &sarg) <= 0)
+		goto err;
+
+	ndef_aux->val = val;
+	ndef_aux->it = it;
+	ndef_aux->ndef_bio = sarg.ndef_bio;
+	ndef_aux->boundary = sarg.boundary;
+	ndef_aux->out = out;
+
+	BIO_ctrl(asn_bio, BIO_C_SET_EX_ARG, 0, ndef_aux);
+
+	return sarg.ndef_bio;
+
+	err:
+	if (asn_bio)
+		BIO_free(asn_bio);
+	if (ndef_aux)
+		OPENSSL_free(ndef_aux);
+	return NULL;
+	}
+
+static int ndef_prefix(BIO *b, unsigned char **pbuf, int *plen, void *parg)
+	{
+	NDEF_SUPPORT *ndef_aux;
+	unsigned char *p;
+	int derlen;
+
+	if (!parg)
+		return 0;
+
+	ndef_aux = *(NDEF_SUPPORT **)parg;
+
+	derlen = ASN1_item_ndef_i2d(ndef_aux->val, NULL, ndef_aux->it);
+	p = OPENSSL_malloc(derlen);
+	ndef_aux->derbuf = p;
+	*pbuf = p;
+	derlen = ASN1_item_ndef_i2d(ndef_aux->val, &p, ndef_aux->it);
+
+	if (!*ndef_aux->boundary)
+		return 0;
+
+	*plen = *ndef_aux->boundary - *pbuf;
+
+	return 1;
+	}
+
+static int ndef_prefix_free(BIO *b, unsigned char **pbuf, int *plen, void *parg)
+	{
+	NDEF_SUPPORT *ndef_aux;
+
+	if (!parg)
+		return 0;
+
+	ndef_aux = *(NDEF_SUPPORT **)parg;
+
+	if (ndef_aux->derbuf)
+		OPENSSL_free(ndef_aux->derbuf);
+
+	ndef_aux->derbuf = NULL;
+	*pbuf = NULL;
+	*plen = 0;
+	return 1;
+	}
+
+static int ndef_suffix_free(BIO *b, unsigned char **pbuf, int *plen, void *parg)
+	{
+	NDEF_SUPPORT **pndef_aux = (NDEF_SUPPORT **)parg;
+	if (!ndef_prefix_free(b, pbuf, plen, parg))
+		return 0;
+	OPENSSL_free(*pndef_aux);
+	*pndef_aux = NULL;
+	return 1;
+	}
+
+static int ndef_suffix(BIO *b, unsigned char **pbuf, int *plen, void *parg)
+	{
+	NDEF_SUPPORT *ndef_aux;
+	unsigned char *p;
+	int derlen;
+	const ASN1_AUX *aux;
+	ASN1_STREAM_ARG sarg;
+
+	if (!parg)
+		return 0;
+
+	ndef_aux = *(NDEF_SUPPORT **)parg;
+
+	aux = ndef_aux->it->funcs;
+
+	/* Finalize structures */
+	sarg.ndef_bio = ndef_aux->ndef_bio;
+	sarg.out = ndef_aux->out;
+	sarg.boundary = ndef_aux->boundary;
+	if (aux->asn1_cb(ASN1_OP_STREAM_POST,
+				&ndef_aux->val, ndef_aux->it, &sarg) <= 0)
+		return 0;
+
+	derlen = ASN1_item_ndef_i2d(ndef_aux->val, NULL, ndef_aux->it);
+	p = OPENSSL_malloc(derlen);
+	ndef_aux->derbuf = p;
+	*pbuf = p;
+	derlen = ASN1_item_ndef_i2d(ndef_aux->val, &p, ndef_aux->it);
+
+	if (!*ndef_aux->boundary)
+		return 0;
+	*pbuf = *ndef_aux->boundary;
+	*plen = derlen - (*ndef_aux->boundary - ndef_aux->derbuf);
+
+	return 1;
+	}