crypto/cms/cms_cd.c

   1 /*
   2  * Copyright 2008-2022 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 <openssl/bio.h>
  17 #include <openssl/comp.h>
  18 #include "cms_local.h"
  19
  20 #ifdef ZLIB
  21
  22 /* CMS CompressedData Utilities */
  23
  24 CMS_ContentInfo *ossl_cms_CompressedData_create(int comp_nid,
  25                                                 OSSL_LIB_CTX *libctx,
  26                                                 const char *propq)
  27 {
  28     CMS_ContentInfo *cms;
  29     CMS_CompressedData *cd;
  30
  31     /*
  32      * Will need something cleverer if there is ever more than one
  33      * compression algorithm or parameters have some meaning...
  34      */
  35     if (comp_nid != NID_zlib_compression) {
  36         ERR_raise(ERR_LIB_CMS, CMS_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
  37         return NULL;
  38     }
  39     cms = CMS_ContentInfo_new_ex(libctx, propq);
  40     if (cms == NULL)
  41         return NULL;
  42
  43     cd = M_ASN1_new_of(CMS_CompressedData);
  44
  45     if (cd == NULL)
  46         goto err;
  47
  48     cms->contentType = OBJ_nid2obj(NID_id_smime_ct_compressedData);
  49     cms->d.compressedData = cd;
  50
  51     cd->version = 0;
  52
  53     (void)X509_ALGOR_set0(cd->compressionAlgorithm,
  54                           OBJ_nid2obj(NID_zlib_compression),
  55                           V_ASN1_UNDEF, NULL); /* cannot fail */
  56
  57     cd->encapContentInfo->eContentType = OBJ_nid2obj(NID_pkcs7_data);
  58
  59     return cms;
  60
  61  err:
  62     CMS_ContentInfo_free(cms);
  63     return NULL;
  64 }
  65
  66 BIO *ossl_cms_CompressedData_init_bio(const CMS_ContentInfo *cms)
  67 {
  68     CMS_CompressedData *cd;
  69     const ASN1_OBJECT *compoid;
  70
  71     if (OBJ_obj2nid(cms->contentType) != NID_id_smime_ct_compressedData) {
  72         ERR_raise(ERR_LIB_CMS, CMS_R_CONTENT_TYPE_NOT_COMPRESSED_DATA);
  73         return NULL;
  74     }
  75     cd = cms->d.compressedData;
  76     X509_ALGOR_get0(&compoid, NULL, NULL, cd->compressionAlgorithm);
  77     if (OBJ_obj2nid(compoid) != NID_zlib_compression) {
  78         ERR_raise(ERR_LIB_CMS, CMS_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
  79         return NULL;
  80     }
  81     return BIO_new(BIO_f_zlib());
  82 }
  83
  84 #endif