crypto/cms/cms_dd.c

   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
  63 DECLARE_ASN1_ITEM(CMS_DigestedData)
  64
  65 /* CMS DigestedData Utilities */
  66
  67 CMS_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     X509_ALGOR_set_md(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
  98 BIO *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
 105 int 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 }