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/*
* Copyright 2008-2020 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include "internal/cryptlib.h"
#include <openssl/asn1t.h>
#include <openssl/pem.h>
#include <openssl/x509v3.h>
#include <openssl/err.h>
#include <openssl/cms.h>
#include "cms_local.h"
/* CMS DigestedData Utilities */
CMS_ContentInfo *cms_DigestedData_create(const EVP_MD *md,
OSSL_LIB_CTX *libctx,
const char *propq)
{
CMS_ContentInfo *cms;
CMS_DigestedData *dd;
cms = CMS_ContentInfo_new_ex(libctx, propq);
if (cms == NULL)
return NULL;
dd = M_ASN1_new_of(CMS_DigestedData);
if (dd == NULL)
goto err;
cms->contentType = OBJ_nid2obj(NID_pkcs7_digest);
cms->d.digestedData = dd;
dd->version = 0;
dd->encapContentInfo->eContentType = OBJ_nid2obj(NID_pkcs7_data);
X509_ALGOR_set_md(dd->digestAlgorithm, md);
return cms;
err:
CMS_ContentInfo_free(cms);
return NULL;
}
BIO *cms_DigestedData_init_bio(const CMS_ContentInfo *cms)
{
CMS_DigestedData *dd = cms->d.digestedData;
return cms_DigestAlgorithm_init_bio(dd->digestAlgorithm, cms_get0_cmsctx(cms));
}
int cms_DigestedData_do_final(const CMS_ContentInfo *cms, BIO *chain, int verify)
{
EVP_MD_CTX *mctx = EVP_MD_CTX_new();
unsigned char md[EVP_MAX_MD_SIZE];
unsigned int mdlen;
int r = 0;
CMS_DigestedData *dd;
if (mctx == NULL) {
CMSerr(CMS_F_CMS_DIGESTEDDATA_DO_FINAL, ERR_R_MALLOC_FAILURE);
goto err;
}
dd = cms->d.digestedData;
if (!cms_DigestAlgorithm_find_ctx(mctx, chain, dd->digestAlgorithm))
goto err;
if (EVP_DigestFinal_ex(mctx, md, &mdlen) <= 0)
goto err;
if (verify) {
if (mdlen != (unsigned int)dd->digest->length) {
CMSerr(CMS_F_CMS_DIGESTEDDATA_DO_FINAL,
CMS_R_MESSAGEDIGEST_WRONG_LENGTH);
goto err;
}
if (memcmp(md, dd->digest->data, mdlen))
CMSerr(CMS_F_CMS_DIGESTEDDATA_DO_FINAL,
CMS_R_VERIFICATION_FAILURE);
else
r = 1;
} else {
if (!ASN1_STRING_set(dd->digest, md, mdlen))
goto err;
r = 1;
}
err:
EVP_MD_CTX_free(mctx);
return r;
}
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