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/*
* Copyright 2013-2020 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
/*
* DH low level APIs are deprecated for public use, but still ok for
* internal use.
*/
#include "internal/deprecated.h"
#include "e_os.h"
#ifndef OPENSSL_NO_CMS
# include <string.h>
# include <openssl/core_names.h>
# include <openssl/dh.h>
# include <openssl/evp.h>
# include <openssl/asn1.h>
# include <openssl/kdf.h>
# include <internal/provider.h>
int DH_KDF_X9_42(unsigned char *out, size_t outlen,
const unsigned char *Z, size_t Zlen,
ASN1_OBJECT *key_oid,
const unsigned char *ukm, size_t ukmlen, const EVP_MD *md)
{
int ret = 0, nid;
EVP_KDF_CTX *kctx = NULL;
EVP_KDF *kdf = NULL;
const char *oid_sn;
OSSL_PARAM params[5], *p = params;
const char *mdname = EVP_MD_name(md);
const OSSL_PROVIDER *prov = EVP_MD_provider(md);
OPENSSL_CTX *provctx = ossl_provider_library_context(prov);
nid = OBJ_obj2nid(key_oid);
if (nid == NID_undef)
return 0;
oid_sn = OBJ_nid2sn(nid);
if (oid_sn == NULL)
return 0;
kdf = EVP_KDF_fetch(provctx, OSSL_KDF_NAME_X942KDF, NULL);
if ((kctx = EVP_KDF_new_ctx(kdf)) == NULL)
goto err;
*p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST,
(char *)mdname, 0);
*p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_KEY,
(unsigned char *)Z, Zlen);
if (ukm != NULL)
*p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_UKM,
(unsigned char *)ukm, ukmlen);
*p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_CEK_ALG,
(char *)oid_sn, 0);
*p = OSSL_PARAM_construct_end();
ret = EVP_KDF_set_ctx_params(kctx, params) > 0
&& EVP_KDF_derive(kctx, out, outlen) > 0;
err:
EVP_KDF_free_ctx(kctx);
EVP_KDF_free(kdf);
return ret;
}
#endif /* OPENSSL_NO_CMS */
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