1/* crypto/cms/cms_dd.c */
2/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
3 * project.
4 */
5/* ====================================================================
6 * Copyright (c) 2008 The OpenSSL Project.  All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in
17 *    the documentation and/or other materials provided with the
18 *    distribution.
19 *
20 * 3. All advertising materials mentioning features or use of this
21 *    software must display the following acknowledgment:
22 *    "This product includes software developed by the OpenSSL Project
23 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
24 *
25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26 *    endorse or promote products derived from this software without
27 *    prior written permission. For written permission, please contact
28 *    licensing@OpenSSL.org.
29 *
30 * 5. Products derived from this software may not be called "OpenSSL"
31 *    nor may "OpenSSL" appear in their names without prior written
32 *    permission of the OpenSSL Project.
33 *
34 * 6. Redistributions of any form whatsoever must retain the following
35 *    acknowledgment:
36 *    "This product includes software developed by the OpenSSL Project
37 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
38 *
39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50 * OF THE POSSIBILITY OF SUCH DAMAGE.
51 * ====================================================================
52 */
53
54#include "cryptlib.h"
55#include <openssl/asn1t.h>
56#include <openssl/pem.h>
57#include <openssl/x509v3.h>
58#include <openssl/err.h>
59#include <openssl/cms.h>
60#include "cms_lcl.h"
61
62DECLARE_ASN1_ITEM(CMS_DigestedData)
63
64/* CMS DigestedData Utilities */
65
66CMS_ContentInfo *cms_DigestedData_create(const EVP_MD *md)
67	{
68	CMS_ContentInfo *cms;
69	CMS_DigestedData *dd;
70	cms = CMS_ContentInfo_new();
71	if (!cms)
72		return NULL;
73
74	dd = M_ASN1_new_of(CMS_DigestedData);
75
76	if (!dd)
77		goto err;
78
79	cms->contentType = OBJ_nid2obj(NID_pkcs7_digest);
80	cms->d.digestedData = dd;
81
82	dd->version = 0;
83	dd->encapContentInfo->eContentType = OBJ_nid2obj(NID_pkcs7_data);
84
85	cms_DigestAlgorithm_set(dd->digestAlgorithm, md);
86
87	return cms;
88
89	err:
90
91	if (cms)
92		CMS_ContentInfo_free(cms);
93
94	return NULL;
95	}
96
97BIO *cms_DigestedData_init_bio(CMS_ContentInfo *cms)
98	{
99	CMS_DigestedData *dd;
100	dd = cms->d.digestedData;
101	return cms_DigestAlgorithm_init_bio(dd->digestAlgorithm);
102	}
103
104int cms_DigestedData_do_final(CMS_ContentInfo *cms, BIO *chain, int verify)
105	{
106	EVP_MD_CTX mctx;
107	unsigned char md[EVP_MAX_MD_SIZE];
108	unsigned int mdlen;
109	int r = 0;
110	CMS_DigestedData *dd;
111	EVP_MD_CTX_init(&mctx);
112
113	dd = cms->d.digestedData;
114
115	if (!cms_DigestAlgorithm_find_ctx(&mctx, chain, dd->digestAlgorithm))
116		goto err;
117
118	if (EVP_DigestFinal_ex(&mctx, md, &mdlen) <= 0)
119		goto err;
120
121	if (verify)
122		{
123		if (mdlen != (unsigned int)dd->digest->length)
124			{
125			CMSerr(CMS_F_CMS_DIGESTEDDATA_DO_FINAL,
126				CMS_R_MESSAGEDIGEST_WRONG_LENGTH);
127			goto err;
128			}
129
130		if (memcmp(md, dd->digest->data, mdlen))
131			CMSerr(CMS_F_CMS_DIGESTEDDATA_DO_FINAL,
132				CMS_R_VERIFICATION_FAILURE);
133		else
134			r = 1;
135		}
136	else
137		{
138		if (!ASN1_STRING_set(dd->digest, md, mdlen))
139			goto err;
140		r = 1;
141		}
142
143	err:
144	EVP_MD_CTX_cleanup(&mctx);
145
146	return r;
147
148	}
149