2 * Copyright 2013-2022 The OpenSSL Project Authors. All Rights Reserved.
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
11 * DH low level APIs are deprecated for public use, but still ok for
14 #include "internal/deprecated.h"
16 #include "internal/e_os.h"
17 #include "internal/e_os.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"
27 /* Key derivation function from X9.63/SECG */
28 int ossl_dh_kdf_X9_42_asn1(unsigned char *out, size_t outlen,
29 const unsigned char *Z, size_t Zlen,
31 const unsigned char *ukm, size_t ukmlen,
33 OSSL_LIB_CTX *libctx, const char *propq)
36 EVP_KDF_CTX *kctx = NULL;
38 OSSL_PARAM params[5], *p = params;
39 const char *mdname = EVP_MD_get0_name(md);
41 kdf = EVP_KDF_fetch(libctx, OSSL_KDF_NAME_X942KDF_ASN1, propq);
44 kctx = EVP_KDF_CTX_new(kdf);
48 *p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST,
50 *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_KEY,
51 (unsigned char *)Z, Zlen);
53 *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_UKM,
54 (unsigned char *)ukm, ukmlen);
55 *p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_CEK_ALG,
57 *p = OSSL_PARAM_construct_end();
58 ret = EVP_KDF_derive(kctx, out, outlen, params) > 0;
60 EVP_KDF_CTX_free(kctx);
65 #if !defined(FIPS_MODULE)
66 int DH_KDF_X9_42(unsigned char *out, size_t outlen,
67 const unsigned char *Z, size_t Zlen,
69 const unsigned char *ukm, size_t ukmlen, const EVP_MD *md)
71 char key_alg[OSSL_MAX_NAME_SIZE];
72 const OSSL_PROVIDER *prov = EVP_MD_get0_provider(md);
73 OSSL_LIB_CTX *libctx = ossl_provider_libctx(prov);
75 if (OBJ_obj2txt(key_alg, sizeof(key_alg), key_oid, 0) <= 0)
78 return ossl_dh_kdf_X9_42_asn1(out, outlen, Z, Zlen, key_alg,
79 ukm, ukmlen, md, libctx, NULL);
81 #endif /* !defined(FIPS_MODULE) */