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 
62 DECLARE_ASN1_ITEM(CMS_DigestedData)
63 
64 /* CMS DigestedData Utilities */
65 
66 CMS_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 
97 BIO *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 
104 int 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