Experimental streaming PKCS#7 support.

I thought it was about time I dusted this off. This stuff had been sitting on
my hard drive for *ages* (2003 in fact). Hasn't been tested well and may not
work properly.

Nothing uses it at present which is just as well.

Think of this as a traditional Christmas present which looks far more
impressive in the adverts and on the box, some of the bits are missing and
falls to bits if you play with it too much.

1 files changed, 200 insertions, 0 deletions

diff --git a/crypto/pkcs7/bio_pk7.c b/crypto/pkcs7/bio_pk7.c
new file mode 100644
index 0000000000..831a4e23b8
--- /dev/null
+++ b/crypto/pkcs7/bio_pk7.c
@@ -0,0 +1,200 @@
+/* bio_pk7.c */
+/* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
+ * project.
+ */
+/* ====================================================================
+ * Copyright (c) 2006 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.
+ * ====================================================================
+ *
+ * This product includes cryptographic software written by Eric Young
+ * (eay@cryptsoft.com).  This product includes software written by Tim
+ * Hudson (tjh@cryptsoft.com).
+ *
+ */
+
+#include <openssl/asn1.h>
+#include <openssl/pkcs7.h>
+#include <openssl/bio.h>
+
+#include <memory.h>
+#include <stdio.h>
+
+/* Highly experiemental PKCS#7 BIO support routines */
+
+/* The usage is quite simple, initialize a PKCS7 structure,
+ * get a BIO from it then any data written through the BIO
+ * will end up translated to PKCS#7 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 pkcs7_aux_st
+	{
+	/* PKCS7 structure this BIO refers to */
+	PKCS7 *p7;
+	/* Top of the BIO chain */
+	BIO *p7bio;
+	/* Output BIO */
+	BIO *out;
+	/* Boundary where content is inserted */
+	unsigned char **boundary;
+	/* DER buffer start */
+	unsigned char *derbuf;
+	} PKCS7_SUPPORT;
+
+static int pkcs7_prefix(BIO *b, unsigned char **pbuf, int *plen, void *parg);
+static int pkcs7_psfix_free(BIO *b, unsigned char **pbuf, int *plen, void *parg);
+static int pkcs7_suffix(BIO *b, unsigned char **pbuf, int *plen, void *parg);
+
+BIO *BIO_new_PKCS7(BIO *out, PKCS7 *p7) 
+	{
+	PKCS7_SUPPORT *p7aux = NULL;
+	BIO *p7bio = NULL;
+	BIO *asn_bio = NULL;
+	unsigned char **boundary;
+	p7aux = OPENSSL_malloc(sizeof(PKCS7_SUPPORT));
+	asn_bio = BIO_new(BIO_f_asn1());
+
+	/* ASN1 bio needs to be next to output BIO */
+
+	out = BIO_push(asn_bio, out);
+
+	BIO_asn1_set_prefix(asn_bio, pkcs7_prefix, pkcs7_psfix_free);
+	BIO_asn1_set_suffix(asn_bio, pkcs7_suffix, pkcs7_psfix_free);
+
+	/* Now initialize BIO for PKCS#7 output */
+
+	p7bio = PKCS7_dataInit(p7, out);
+	PKCS7_stream(&boundary, p7);
+
+	p7aux->p7 = p7;
+	p7aux->p7bio = p7bio;
+	p7aux->boundary = boundary;
+	p7aux->out = out;
+
+	BIO_ctrl(asn_bio, BIO_C_SET_EX_ARG, 0, p7aux);
+
+	return p7bio;
+
+	}
+
+
+static int pkcs7_prefix(BIO *b, unsigned char **pbuf, int *plen, void *parg)
+	{
+	PKCS7_SUPPORT *p7aux;
+	unsigned char *p;
+	int derlen;
+
+	if (!parg)
+		return 0;
+
+	p7aux = *(PKCS7_SUPPORT **)parg;
+
+	derlen = i2d_PKCS7_NDEF(p7aux->p7, NULL);
+	p = OPENSSL_malloc(derlen);
+	p7aux->derbuf = p;
+	*pbuf = p;
+	i2d_PKCS7_NDEF(p7aux->p7, &p);
+
+	*plen = *p7aux->boundary - *pbuf;
+
+	return 1;
+	}
+
+static int pkcs7_psfix_free(BIO *b, unsigned char **pbuf, int *plen, void *parg)
+	{
+	PKCS7_SUPPORT *p7aux;
+
+	if (!parg)
+		return 0;
+
+	p7aux = *(PKCS7_SUPPORT **)parg;
+
+	if (p7aux->derbuf)
+		OPENSSL_free(p7aux->derbuf);
+
+	p7aux->derbuf = NULL;
+	*pbuf = NULL;
+	*plen = 0;
+	return 1;
+	}
+
+static int pkcs7_suffix(BIO *b, unsigned char **pbuf, int *plen, void *parg)
+	{
+	PKCS7_SUPPORT *p7aux;
+	unsigned char *p;
+	int derlen;
+
+	if (!parg)
+		return 0;
+
+	p7aux = *(PKCS7_SUPPORT **)parg;
+
+	/* Finalize structures */
+	PKCS7_dataFinal(p7aux->p7, p7aux->p7bio);
+
+	derlen = i2d_PKCS7_NDEF(p7aux->p7, NULL);
+	p = OPENSSL_malloc(derlen);
+	p7aux->derbuf = p;
+	i2d_PKCS7_NDEF(p7aux->p7, &p);
+	*pbuf = *p7aux->boundary;
+	*plen = derlen - (*p7aux->boundary - p7aux->derbuf);
+
+	return 1;
+	}
+	
+