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      1 /* crypto/cms/cms_dd.c */
      2 /* Written by Dr Stephen N Henson (steve (at) 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 (at) 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