crypto/cms/cms_dd.c

   1 /*
   2  * Copyright 2008-2016 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include "internal/cryptlib.h"
  11 #include <openssl/asn1t.h>
  12 #include <openssl/pem.h>
  13 #include <openssl/x509v3.h>
  14 #include <openssl/err.h>
  15 #include <openssl/cms.h>
  16 #include "cms_local.h"
  17
  18 /* CMS DigestedData Utilities */
  19
  20 CMS_ContentInfo *cms_DigestedData_create(const EVP_MD *md,
  21                                          OPENSSL_CTX *libctx, const char *propq)
  22 {
  23     CMS_ContentInfo *cms;
  24     CMS_DigestedData *dd;
  25
  26     cms = CMS_ContentInfo_new_ex(libctx, propq);
  27     if (cms == NULL)
  28         return NULL;
  29
  30     dd = M_ASN1_new_of(CMS_DigestedData);
  31
  32     if (dd == NULL)
  33         goto err;
  34
  35     cms->contentType = OBJ_nid2obj(NID_pkcs7_digest);
  36     cms->d.digestedData = dd;
  37
  38     dd->version = 0;
  39     dd->encapContentInfo->eContentType = OBJ_nid2obj(NID_pkcs7_data);
  40
  41     X509_ALGOR_set_md(dd->digestAlgorithm, md);
  42
  43     return cms;
  44
  45  err:
  46     CMS_ContentInfo_free(cms);
  47     return NULL;
  48 }
  49
  50 BIO *cms_DigestedData_init_bio(const CMS_ContentInfo *cms)
  51 {
  52     CMS_DigestedData *dd = cms->d.digestedData;
  53
  54     return cms_DigestAlgorithm_init_bio(dd->digestAlgorithm, cms_get0_cmsctx(cms));
  55 }
  56
  57 int cms_DigestedData_do_final(const CMS_ContentInfo *cms, BIO *chain, int verify)
  58 {
  59     EVP_MD_CTX *mctx = EVP_MD_CTX_new();
  60     unsigned char md[EVP_MAX_MD_SIZE];
  61     unsigned int mdlen;
  62     int r = 0;
  63     CMS_DigestedData *dd;
  64
  65     if (mctx == NULL) {
  66         CMSerr(CMS_F_CMS_DIGESTEDDATA_DO_FINAL, ERR_R_MALLOC_FAILURE);
  67         goto err;
  68     }
  69
  70     dd = cms->d.digestedData;
  71
  72     if (!cms_DigestAlgorithm_find_ctx(mctx, chain, dd->digestAlgorithm))
  73         goto err;
  74
  75     if (EVP_DigestFinal_ex(mctx, md, &mdlen) <= 0)
  76         goto err;
  77
  78     if (verify) {
  79         if (mdlen != (unsigned int)dd->digest->length) {
  80             CMSerr(CMS_F_CMS_DIGESTEDDATA_DO_FINAL,
  81                    CMS_R_MESSAGEDIGEST_WRONG_LENGTH);
  82             goto err;
  83         }
  84
  85         if (memcmp(md, dd->digest->data, mdlen))
  86             CMSerr(CMS_F_CMS_DIGESTEDDATA_DO_FINAL,
  87                    CMS_R_VERIFICATION_FAILURE);
  88         else
  89             r = 1;
  90     } else {
  91         if (!ASN1_STRING_set(dd->digest, md, mdlen))
  92             goto err;
  93         r = 1;
  94     }
  95
  96  err:
  97     EVP_MD_CTX_free(mctx);
  98
  99     return r;
 100
 101 }