Add EVP_KDF-X942 to the fips module
[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 #include "e_os.h"
18 #include <string.h>
19 #include <openssl/core_names.h>
20 #include <openssl/dh.h>
21 #include <openssl/evp.h>
22 #include <openssl/asn1.h>
23 #include <openssl/kdf.h>
24 #include <internal/provider.h>
25 #include <crypto/dh.h>
26
27 /* Key derivation function from X9.63/SECG */
28 int dh_KDF_X9_42_asn1(unsigned char *out, size_t outlen,
29                       const unsigned char *Z, size_t Zlen,
30                       const char *cek_alg,
31                       const unsigned char *ukm, size_t ukmlen, const EVP_MD *md,
32                       OSSL_LIB_CTX *libctx, const char *propq)
33 {
34     int ret = 0;
35     EVP_KDF_CTX *kctx = NULL;
36     EVP_KDF *kdf = NULL;
37     OSSL_PARAM params[5], *p = params;
38     const char *mdname = EVP_MD_name(md);
39
40     kdf = EVP_KDF_fetch(libctx, OSSL_KDF_NAME_X942KDF_ASN1, propq);
41     kctx = EVP_KDF_CTX_new(kdf);
42     if (kctx == NULL)
43         goto err;
44
45     *p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST,
46                                             (char *)mdname, 0);
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 *)cek_alg, 0);
54     *p = OSSL_PARAM_construct_end();
55     ret = EVP_KDF_CTX_set_params(kctx, params) > 0
56           && EVP_KDF_derive(kctx, out, outlen) > 0;
57 err:
58     EVP_KDF_CTX_free(kctx);
59     EVP_KDF_free(kdf);
60     return ret;
61 }
62
63 #if !defined(FIPS_MODULE)
64 int DH_KDF_X9_42(unsigned char *out, size_t outlen,
65                  const unsigned char *Z, size_t Zlen,
66                  ASN1_OBJECT *key_oid,
67                  const unsigned char *ukm, size_t ukmlen, const EVP_MD *md)
68 {
69     int nid;
70     const char *key_alg = NULL;
71     const OSSL_PROVIDER *prov = EVP_MD_provider(md);
72     OSSL_LIB_CTX *libctx = ossl_provider_libctx(prov);
73
74     nid = OBJ_obj2nid(key_oid);
75     if (nid == NID_undef)
76         return 0;
77     key_alg = OBJ_nid2sn(nid);
78     if (key_alg == NULL)
79         return 0;
80
81     return dh_KDF_X9_42_asn1(out, outlen, Z, Zlen, key_alg,
82                              ukm, ukmlen, md, libctx, NULL);
83 }
84 #endif /* !defined(FIPS_MODULE) */