1/*
2 * Copyright 2013-2019 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 "e_os.h"
11
12#ifndef OPENSSL_NO_CMS
13# include <string.h>
14# include <openssl/core_names.h>
15# include <openssl/dh.h>
16# include <openssl/evp.h>
17# include <openssl/asn1.h>
18# include <openssl/kdf.h>
19# include <internal/provider.h>
20
21int DH_KDF_X9_42(unsigned char *out, size_t outlen,
22 const unsigned char *Z, size_t Zlen,
23 ASN1_OBJECT *key_oid,
24 const unsigned char *ukm, size_t ukmlen, const EVP_MD *md)
25{
26 int ret = 0, nid;
27 EVP_KDF_CTX *kctx = NULL;
28 EVP_KDF *kdf = NULL;
29 const char *oid_sn;
30 OSSL_PARAM params[5], *p = params;
31 const char *mdname = EVP_MD_name(md);
32 const OSSL_PROVIDER *prov = EVP_MD_provider(md);
33 OPENSSL_CTX *provctx = ossl_provider_library_context(prov);
34
35 nid = OBJ_obj2nid(key_oid);
36 if (nid == NID_undef)
37 return 0;
38 oid_sn = OBJ_nid2sn(nid);
39 if (oid_sn == NULL)
40 return 0;
41
42 kdf = EVP_KDF_fetch(provctx, OSSL_KDF_NAME_X942KDF, NULL);
43 if ((kctx = EVP_KDF_CTX_new(kdf)) == NULL)
44 goto err;
45 *p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST,
46 (char *)mdname, strlen(mdname) + 1);
47 *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_KEY,
48 (unsigned char *)Z, Zlen);
49 if (ukm != NULL)
50 *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_UKM,
51 (unsigned char *)ukm, ukmlen);
52 *p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_CEK_ALG,
53 (char *)oid_sn, strlen(oid_sn) + 1);
54 *p = OSSL_PARAM_construct_end();
55 ret = EVP_KDF_CTX_set_params(kctx, params) > 0
56 && EVP_KDF_derive(kctx, out, outlen) > 0;
57err:
58 EVP_KDF_CTX_free(kctx);
59 EVP_KDF_free(kdf);
60 return ret;
61}
62#endif /* OPENSSL_NO_CMS */
63