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/*
* Copyright 2013-2022 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 "internal/e_os.h"
#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"
#include "crypto/dh.h"
/* Key derivation function from X9.63/SECG */
int ossl_dh_kdf_X9_42_asn1(unsigned char *out, size_t outlen,
const unsigned char *Z, size_t Zlen,
const char *cek_alg,
const unsigned char *ukm, size_t ukmlen,
const EVP_MD *md,
OSSL_LIB_CTX *libctx, const char *propq)
{
int ret = 0;
EVP_KDF_CTX *kctx = NULL;
EVP_KDF *kdf = NULL;
OSSL_PARAM params[5], *p = params;
const char *mdname = EVP_MD_get0_name(md);
kdf = EVP_KDF_fetch(libctx, OSSL_KDF_NAME_X942KDF_ASN1, propq);
if (kdf == NULL)
return 0;
kctx = EVP_KDF_CTX_new(kdf);
if (kctx == 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 *)cek_alg, 0);
*p = OSSL_PARAM_construct_end();
ret = EVP_KDF_derive(kctx, out, outlen, params) > 0;
err:
EVP_KDF_CTX_free(kctx);
EVP_KDF_free(kdf);
return ret;
}
#if !defined(FIPS_MODULE)
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)
{
char key_alg[OSSL_MAX_NAME_SIZE];
const OSSL_PROVIDER *prov = EVP_MD_get0_provider(md);
OSSL_LIB_CTX *libctx = ossl_provider_libctx(prov);
if (OBJ_obj2txt(key_alg, sizeof(key_alg), key_oid, 0) <= 0)
return 0;
return ossl_dh_kdf_X9_42_asn1(out, outlen, Z, Zlen, key_alg,
ukm, ukmlen, md, libctx, NULL);
}
#endif /* !defined(FIPS_MODULE) */
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