/* pk7_attr.c */
/* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
 * project 2001.
 */
/* ====================================================================
 * Copyright (c) 2001-2004 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 <stdio.h>
#include <stdlib.h>
#include <openssl/bio.h>
#include <openssl/asn1.h>
#include <openssl/pem.h>
#include <openssl/pkcs7.h>
#include <openssl/x509.h>
#include <openssl/err.h>

int PKCS7_add_attrib_smimecap(PKCS7_SIGNER_INFO *si, STACK_OF(X509_ALGOR) *cap)
{
	ASN1_STRING *seq;
	unsigned char *p, *pp;
	int len;
	len=i2d_ASN1_SET_OF_X509_ALGOR(cap,NULL,i2d_X509_ALGOR,
				       V_ASN1_SEQUENCE,V_ASN1_UNIVERSAL,
				       IS_SEQUENCE);
	if(!(pp=(unsigned char *)OPENSSL_malloc(len))) {
		PKCS7err(PKCS7_F_PKCS7_ADD_ATTRIB_SMIMECAP,ERR_R_MALLOC_FAILURE);
		return 0;
	}
	p=pp;
	i2d_ASN1_SET_OF_X509_ALGOR(cap,&p,i2d_X509_ALGOR, V_ASN1_SEQUENCE,
				   V_ASN1_UNIVERSAL, IS_SEQUENCE);
	if(!(seq = ASN1_STRING_new())) {
		PKCS7err(PKCS7_F_PKCS7_ADD_ATTRIB_SMIMECAP,ERR_R_MALLOC_FAILURE);
		return 0;
	}
	if(!ASN1_STRING_set (seq, pp, len)) {
		PKCS7err(PKCS7_F_PKCS7_ADD_ATTRIB_SMIMECAP,ERR_R_MALLOC_FAILURE);
		return 0;
	}
	OPENSSL_free (pp);
        return PKCS7_add_signed_attribute(si, NID_SMIMECapabilities,
							V_ASN1_SEQUENCE, seq);
}

STACK_OF(X509_ALGOR) *PKCS7_get_smimecap(PKCS7_SIGNER_INFO *si)
	{
	ASN1_TYPE *cap;
	const unsigned char *p;

	cap = PKCS7_get_signed_attribute(si, NID_SMIMECapabilities);
	if (!cap || (cap->type != V_ASN1_SEQUENCE))
		return NULL;
	p = cap->value.sequence->data;
	return d2i_ASN1_SET_OF_X509_ALGOR(NULL, &p,
					  cap->value.sequence->length,
					  d2i_X509_ALGOR, X509_ALGOR_free,
					  V_ASN1_SEQUENCE, V_ASN1_UNIVERSAL);
	}

/* Basic smime-capabilities OID and optional integer arg */
int PKCS7_simple_smimecap(STACK_OF(X509_ALGOR) *sk, int nid, int arg)
{
	X509_ALGOR *alg;

	if(!(alg = X509_ALGOR_new())) {
		PKCS7err(PKCS7_F_PKCS7_SIMPLE_SMIMECAP,ERR_R_MALLOC_FAILURE);
		return 0;
	}
	ASN1_OBJECT_free(alg->algorithm);
	alg->algorithm = OBJ_nid2obj (nid);
	if (arg > 0) {
		ASN1_INTEGER *nbit;
		if(!(alg->parameter = ASN1_TYPE_new())) {
			PKCS7err(PKCS7_F_PKCS7_SIMPLE_SMIMECAP,ERR_R_MALLOC_FAILURE);
			return 0;
		}
		if(!(nbit = ASN1_INTEGER_new())) {
			PKCS7err(PKCS7_F_PKCS7_SIMPLE_SMIMECAP,ERR_R_MALLOC_FAILURE);
			return 0;
		}
		if(!ASN1_INTEGER_set (nbit, arg)) {
			PKCS7err(PKCS7_F_PKCS7_SIMPLE_SMIMECAP,ERR_R_MALLOC_FAILURE);
			return 0;
		}
		alg->parameter->value.integer = nbit;
		alg->parameter->type = V_ASN1_INTEGER;
	}
	sk_X509_ALGOR_push (sk, alg);
	return 1;
}