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                                          OSSL_LIB_CTX *libctx,
  22                                          const char *propq)
  23 {
  24     CMS_ContentInfo *cms;
  25     CMS_DigestedData *dd;
  26
  27     cms = CMS_ContentInfo_new_ex(libctx, propq);
  28     if (cms == NULL)
  29         return NULL;
  30
  31     dd = M_ASN1_new_of(CMS_DigestedData);
  32
  33     if (dd == NULL)
  34         goto err;
  35
  36     cms->contentType = OBJ_nid2obj(NID_pkcs7_digest);
  37     cms->d.digestedData = dd;
  38
  39     dd->version = 0;
  40     dd->encapContentInfo->eContentType = OBJ_nid2obj(NID_pkcs7_data);
  41
  42     X509_ALGOR_set_md(dd->digestAlgorithm, md);
  43
  44     return cms;
  45
  46  err:
  47     CMS_ContentInfo_free(cms);
  48     return NULL;
  49 }
  50
  51 BIO *cms_DigestedData_init_bio(const CMS_ContentInfo *cms)
  52 {
  53     CMS_DigestedData *dd = cms->d.digestedData;
  54
  55     return cms_DigestAlgorithm_init_bio(dd->digestAlgorithm, cms_get0_cmsctx(cms));
  56 }
  57
  58 int cms_DigestedData_do_final(const CMS_ContentInfo *cms, BIO *chain, int verify)
  59 {
  60     EVP_MD_CTX *mctx = EVP_MD_CTX_new();
  61     unsigned char md[EVP_MAX_MD_SIZE];
  62     unsigned int mdlen;
  63     int r = 0;
  64     CMS_DigestedData *dd;
  65
  66     if (mctx == NULL) {
  67         CMSerr(CMS_F_CMS_DIGESTEDDATA_DO_FINAL, ERR_R_MALLOC_FAILURE);
  68         goto err;
  69     }
  70
  71     dd = cms->d.digestedData;
  72
  73     if (!cms_DigestAlgorithm_find_ctx(mctx, chain, dd->digestAlgorithm))
  74         goto err;
  75
  76     if (EVP_DigestFinal_ex(mctx, md, &mdlen) <= 0)
  77         goto err;
  78
  79     if (verify) {
  80         if (mdlen != (unsigned int)dd->digest->length) {
  81             CMSerr(CMS_F_CMS_DIGESTEDDATA_DO_FINAL,
  82                    CMS_R_MESSAGEDIGEST_WRONG_LENGTH);
  83             goto err;
  84         }
  85
  86         if (memcmp(md, dd->digest->data, mdlen))
  87             CMSerr(CMS_F_CMS_DIGESTEDDATA_DO_FINAL,
  88                    CMS_R_VERIFICATION_FAILURE);
  89         else
  90             r = 1;
  91     } else {
  92         if (!ASN1_STRING_set(dd->digest, md, mdlen))
  93             goto err;
  94         r = 1;
  95     }
  96
  97  err:
  98     EVP_MD_CTX_free(mctx);
  99
 100     return r;
 101
 102 }