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
20CMS_ContentInfo *cms_DigestedData_create(const EVP_MD *md)
21{
22 CMS_ContentInfo *cms;
23 CMS_DigestedData *dd;
24 cms = CMS_ContentInfo_new();
25 if (cms == NULL)
26 return NULL;
27
28 dd = M_ASN1_new_of(CMS_DigestedData);
29
30 if (dd == NULL)
31 goto err;
32
33 cms->contentType = OBJ_nid2obj(NID_pkcs7_digest);
34 cms->d.digestedData = dd;
35
36 dd->version = 0;
37 dd->encapContentInfo->eContentType = OBJ_nid2obj(NID_pkcs7_data);
38
39 X509_ALGOR_set_md(dd->digestAlgorithm, md);
40
41 return cms;
42
43 err:
44 CMS_ContentInfo_free(cms);
45 return NULL;
46}
47
48BIO *cms_DigestedData_init_bio(const CMS_ContentInfo *cms)
49{
50 CMS_DigestedData *dd;
51 dd = cms->d.digestedData;
52 return cms_DigestAlgorithm_init_bio(dd->digestAlgorithm);
53}
54
55int cms_DigestedData_do_final(const CMS_ContentInfo *cms, BIO *chain, int verify)
56{
57 EVP_MD_CTX *mctx = EVP_MD_CTX_new();
58 unsigned char md[EVP_MAX_MD_SIZE];
59 unsigned int mdlen;
60 int r = 0;
61 CMS_DigestedData *dd;
62
63 if (mctx == NULL) {
64 CMSerr(CMS_F_CMS_DIGESTEDDATA_DO_FINAL, ERR_R_MALLOC_FAILURE);
65 goto err;
66 }
67
68 dd = cms->d.digestedData;
69
70 if (!cms_DigestAlgorithm_find_ctx(mctx, chain, dd->digestAlgorithm))
71 goto err;
72
73 if (EVP_DigestFinal_ex(mctx, md, &mdlen) <= 0)
74 goto err;
75
76 if (verify) {
77 if (mdlen != (unsigned int)dd->digest->length) {
78 CMSerr(CMS_F_CMS_DIGESTEDDATA_DO_FINAL,
79 CMS_R_MESSAGEDIGEST_WRONG_LENGTH);
80 goto err;
81 }
82
83 if (memcmp(md, dd->digest->data, mdlen))
84 CMSerr(CMS_F_CMS_DIGESTEDDATA_DO_FINAL,
85 CMS_R_VERIFICATION_FAILURE);
86 else
87 r = 1;
88 } else {
89 if (!ASN1_STRING_set(dd->digest, md, mdlen))
90 goto err;
91 r = 1;
92 }
93
94 err:
95 EVP_MD_CTX_free(mctx);
96
97 return r;
98
99}
100