1b8a320db1c76faa0359bfa30cad7ed46920fcb3
[openssl.git] / crypto / dh / dh_kdf.c
1 /*
2  * Copyright 2013-2020 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 /*
11  * DH low level APIs are deprecated for public use, but still ok for
12  * internal use.
13  */
14 #include "internal/deprecated.h"
15
16 #include "e_os.h"
17
18 #ifndef OPENSSL_NO_CMS
19 # include <string.h>
20 # include <openssl/core_names.h>
21 # include <openssl/dh.h>
22 # include <openssl/evp.h>
23 # include <openssl/asn1.h>
24 # include <openssl/kdf.h>
25 # include <internal/provider.h>
26
27 int DH_KDF_X9_42(unsigned char *out, size_t outlen,
28                  const unsigned char *Z, size_t Zlen,
29                  ASN1_OBJECT *key_oid,
30                  const unsigned char *ukm, size_t ukmlen, const EVP_MD *md)
31 {
32     int ret = 0, nid;
33     EVP_KDF_CTX *kctx = NULL;
34     EVP_KDF *kdf = NULL;
35     const char *oid_sn;
36     OSSL_PARAM params[5], *p = params;
37     const char *mdname = EVP_MD_name(md);
38     const OSSL_PROVIDER *prov = EVP_MD_provider(md);
39     OPENSSL_CTX *provctx = ossl_provider_library_context(prov);
40
41     nid = OBJ_obj2nid(key_oid);
42     if (nid == NID_undef)
43         return 0;
44     oid_sn = OBJ_nid2sn(nid);
45     if (oid_sn == NULL)
46         return 0;
47
48     kdf = EVP_KDF_fetch(provctx, OSSL_KDF_NAME_X942KDF, NULL);
49     if ((kctx = EVP_KDF_CTX_new(kdf)) == NULL)
50         goto err;
51     *p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST,
52                                             (char *)mdname, 0);
53     *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_KEY,
54                                              (unsigned char *)Z, Zlen);
55     if (ukm != NULL)
56         *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_UKM,
57                                                  (unsigned char *)ukm, ukmlen);
58     *p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_CEK_ALG,
59                                             (char *)oid_sn, 0);
60     *p = OSSL_PARAM_construct_end();
61     ret = EVP_KDF_CTX_set_params(kctx, params) > 0
62         && EVP_KDF_derive(kctx, out, outlen) > 0;
63 err:
64     EVP_KDF_CTX_free(kctx);
65     EVP_KDF_free(kdf);
66     return ret;
67 }
68 #endif /* OPENSSL_NO_CMS */