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
