cms_dd.c revision 296465 
1/* crypto/cms/cms_dd.c */
2/*
3 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
4 * project.
5 */
6/* ====================================================================
7 * Copyright (c) 2008 The OpenSSL Project.  All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 *
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 *
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in
18 *    the documentation and/or other materials provided with the
19 *    distribution.
20 *
21 * 3. All advertising materials mentioning features or use of this
22 *    software must display the following acknowledgment:
23 *    "This product includes software developed by the OpenSSL Project
24 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
25 *
26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
27 *    endorse or promote products derived from this software without
28 *    prior written permission. For written permission, please contact
29 *    licensing@OpenSSL.org.
30 *
31 * 5. Products derived from this software may not be called "OpenSSL"
32 *    nor may "OpenSSL" appear in their names without prior written
33 *    permission of the OpenSSL Project.
34 *
35 * 6. Redistributions of any form whatsoever must retain the following
36 *    acknowledgment:
37 *    "This product includes software developed by the OpenSSL Project
38 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
39 *
40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
43 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
51 * OF THE POSSIBILITY OF SUCH DAMAGE.
52 * ====================================================================
53 */
54
55#include "cryptlib.h"
56#include <openssl/asn1t.h>
57#include <openssl/pem.h>
58#include <openssl/x509v3.h>
59#include <openssl/err.h>
60#include <openssl/cms.h>
61#include "cms_lcl.h"
62
63DECLARE_ASN1_ITEM(CMS_DigestedData)
64
65/* CMS DigestedData Utilities */
66
67CMS_ContentInfo *cms_DigestedData_create(const EVP_MD *md)
68{
69    CMS_ContentInfo *cms;
70    CMS_DigestedData *dd;
71    cms = CMS_ContentInfo_new();
72    if (!cms)
73        return NULL;
74
75    dd = M_ASN1_new_of(CMS_DigestedData);
76
77    if (!dd)
78        goto err;
79
80    cms->contentType = OBJ_nid2obj(NID_pkcs7_digest);
81    cms->d.digestedData = dd;
82
83    dd->version = 0;
84    dd->encapContentInfo->eContentType = OBJ_nid2obj(NID_pkcs7_data);
85
86    cms_DigestAlgorithm_set(dd->digestAlgorithm, md);
87
88    return cms;
89
90 err:
91
92    if (cms)
93        CMS_ContentInfo_free(cms);
94
95    return NULL;
96}
97
98BIO *cms_DigestedData_init_bio(CMS_ContentInfo *cms)
99{
100    CMS_DigestedData *dd;
101    dd = cms->d.digestedData;
102    return cms_DigestAlgorithm_init_bio(dd->digestAlgorithm);
103}
104
105int cms_DigestedData_do_final(CMS_ContentInfo *cms, BIO *chain, int verify)
106{
107    EVP_MD_CTX mctx;
108    unsigned char md[EVP_MAX_MD_SIZE];
109    unsigned int mdlen;
110    int r = 0;
111    CMS_DigestedData *dd;
112    EVP_MD_CTX_init(&mctx);
113
114    dd = cms->d.digestedData;
115
116    if (!cms_DigestAlgorithm_find_ctx(&mctx, chain, dd->digestAlgorithm))
117        goto err;
118
119    if (EVP_DigestFinal_ex(&mctx, md, &mdlen) <= 0)
120        goto err;
121
122    if (verify) {
123        if (mdlen != (unsigned int)dd->digest->length) {
124            CMSerr(CMS_F_CMS_DIGESTEDDATA_DO_FINAL,
125                   CMS_R_MESSAGEDIGEST_WRONG_LENGTH);
126            goto err;
127        }
128
129        if (memcmp(md, dd->digest->data, mdlen))
130            CMSerr(CMS_F_CMS_DIGESTEDDATA_DO_FINAL,
131                   CMS_R_VERIFICATION_FAILURE);
132        else
133            r = 1;
134    } else {
135        if (!ASN1_STRING_set(dd->digest, md, mdlen))
136            goto err;
137        r = 1;
138    }
139
140 err:
141    EVP_MD_CTX_cleanup(&mctx);
142
143    return r;
144
145}
146