xref: /openssl/crypto/cms/cms_cd.c (revision 59d21298)
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 #ifndef OPENSSL_NO_ZLIB
21 
22 /* CMS CompressedData Utilities */
23 
ossl_cms_CompressedData_create(int comp_nid,OSSL_LIB_CTX * libctx,const char * propq)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 
ossl_cms_CompressedData_init_bio(const CMS_ContentInfo * cms)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
85