xref: /openssl/crypto/cms/cms_dd.c (revision e077455e)
1 /*
2  * Copyright 2008-2021 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 
ossl_cms_DigestedData_create(const EVP_MD * md,OSSL_LIB_CTX * libctx,const char * propq)20 CMS_ContentInfo *ossl_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 
ossl_cms_DigestedData_init_bio(const CMS_ContentInfo * cms)51 BIO *ossl_cms_DigestedData_init_bio(const CMS_ContentInfo *cms)
52 {
53     CMS_DigestedData *dd = cms->d.digestedData;
54 
55     return ossl_cms_DigestAlgorithm_init_bio(dd->digestAlgorithm,
56                                              ossl_cms_get0_cmsctx(cms));
57 }
58 
ossl_cms_DigestedData_do_final(const CMS_ContentInfo * cms,BIO * chain,int verify)59 int ossl_cms_DigestedData_do_final(const CMS_ContentInfo *cms, BIO *chain,
60                                    int verify)
61 {
62     EVP_MD_CTX *mctx = EVP_MD_CTX_new();
63     unsigned char md[EVP_MAX_MD_SIZE];
64     unsigned int mdlen;
65     int r = 0;
66     CMS_DigestedData *dd;
67 
68     if (mctx == NULL) {
69         ERR_raise(ERR_LIB_CMS, ERR_R_EVP_LIB);
70         goto err;
71     }
72 
73     dd = cms->d.digestedData;
74 
75     if (!ossl_cms_DigestAlgorithm_find_ctx(mctx, chain, dd->digestAlgorithm))
76         goto err;
77 
78     if (EVP_DigestFinal_ex(mctx, md, &mdlen) <= 0)
79         goto err;
80 
81     if (verify) {
82         if (mdlen != (unsigned int)dd->digest->length) {
83             ERR_raise(ERR_LIB_CMS, CMS_R_MESSAGEDIGEST_WRONG_LENGTH);
84             goto err;
85         }
86 
87         if (memcmp(md, dd->digest->data, mdlen))
88             ERR_raise(ERR_LIB_CMS, 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 }
103