| 1 | /*
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| 2 | * Copyright 2008-2021 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the Apache License 2.0 (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | #include "internal/cryptlib.h"
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| 11 | #include <openssl/asn1t.h>
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| 12 | #include <openssl/pem.h>
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| 13 | #include <openssl/x509v3.h>
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| 14 | #include <openssl/err.h>
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| 15 | #include <openssl/cms.h>
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| 16 | #include "cms_local.h"
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| 17 |
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| 18 | /* CMS DigestedData Utilities */
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| 19 |
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| 20 | CMS_ContentInfo *ossl_cms_DigestedData_create(const EVP_MD *md,
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| 21 | OSSL_LIB_CTX *libctx,
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| 22 | const char *propq)
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| 23 | {
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| 24 | CMS_ContentInfo *cms;
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| 25 | CMS_DigestedData *dd;
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| 26 |
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| 27 | cms = CMS_ContentInfo_new_ex(libctx, propq);
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| 28 | if (cms == NULL)
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| 29 | return NULL;
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| 30 |
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| 31 | dd = M_ASN1_new_of(CMS_DigestedData);
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| 32 |
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| 33 | if (dd == NULL)
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| 34 | goto err;
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| 35 |
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| 36 | cms->contentType = OBJ_nid2obj(NID_pkcs7_digest);
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| 37 | cms->d.digestedData = dd;
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| 38 |
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| 39 | dd->version = 0;
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| 40 | dd->encapContentInfo->eContentType = OBJ_nid2obj(NID_pkcs7_data);
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| 41 |
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| 42 | X509_ALGOR_set_md(dd->digestAlgorithm, md);
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| 43 |
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| 44 | return cms;
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| 45 |
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| 46 | err:
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| 47 | CMS_ContentInfo_free(cms);
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| 48 | return NULL;
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| 49 | }
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| 50 |
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| 51 | BIO *ossl_cms_DigestedData_init_bio(const CMS_ContentInfo *cms)
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| 52 | {
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| 53 | CMS_DigestedData *dd = cms->d.digestedData;
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| 54 |
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| 55 | return ossl_cms_DigestAlgorithm_init_bio(dd->digestAlgorithm,
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| 56 | ossl_cms_get0_cmsctx(cms));
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| 57 | }
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| 58 |
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| 59 | int ossl_cms_DigestedData_do_final(const CMS_ContentInfo *cms, BIO *chain,
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| 60 | int verify)
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| 61 | {
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| 62 | EVP_MD_CTX *mctx = EVP_MD_CTX_new();
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| 63 | unsigned char md[EVP_MAX_MD_SIZE];
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| 64 | unsigned int mdlen;
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| 65 | int r = 0;
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| 66 | CMS_DigestedData *dd;
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| 67 |
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| 68 | if (mctx == NULL) {
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| 69 | ERR_raise(ERR_LIB_CMS, ERR_R_MALLOC_FAILURE);
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| 70 | goto err;
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| 71 | }
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| 72 |
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| 73 | dd = cms->d.digestedData;
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| 74 |
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| 75 | if (!ossl_cms_DigestAlgorithm_find_ctx(mctx, chain, dd->digestAlgorithm))
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| 76 | goto err;
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| 77 |
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| 78 | if (EVP_DigestFinal_ex(mctx, md, &mdlen) <= 0)
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| 79 | goto err;
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| 80 |
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| 81 | if (verify) {
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| 82 | if (mdlen != (unsigned int)dd->digest->length) {
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| 83 | ERR_raise(ERR_LIB_CMS, CMS_R_MESSAGEDIGEST_WRONG_LENGTH);
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| 84 | goto err;
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| 85 | }
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| 86 |
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| 87 | if (memcmp(md, dd->digest->data, mdlen))
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| 88 | ERR_raise(ERR_LIB_CMS, CMS_R_VERIFICATION_FAILURE);
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| 89 | else
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| 90 | r = 1;
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| 91 | } else {
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| 92 | if (!ASN1_STRING_set(dd->digest, md, mdlen))
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| 93 | goto err;
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| 94 | r = 1;
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| 95 | }
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| 96 |
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| 97 | err:
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| 98 | EVP_MD_CTX_free(mctx);
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| 99 |
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| 100 | return r;
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| 101 |
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| 102 | }
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