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/*
* Copyright 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 <openssl/core_names.h>
#include "internal/param_build_set.h"
#include "crypto/dh.h"
/*
* The intention with the "backend" source file is to offer backend functions
* for legacy backends (EVP_PKEY_ASN1_METHOD and EVP_PKEY_METHOD) and provider
* implementations alike.
*/
static int dh_ffc_params_fromdata(DH *dh, const OSSL_PARAM params[])
{
int ret;
FFC_PARAMS *ffc;
if (dh == NULL)
return 0;
ffc = dh_get0_params(dh);
if (ffc == NULL)
return 0;
ret = ossl_ffc_params_fromdata(ffc, params);
if (ret)
dh_cache_named_group(dh); /* This increments dh->dirty_cnt */
return ret;
}
int dh_params_fromdata(DH *dh, const OSSL_PARAM params[])
{
const OSSL_PARAM *param_priv_len;
long priv_len;
if (!dh_ffc_params_fromdata(dh, params))
return 0;
param_priv_len =
OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_DH_PRIV_LEN);
if (param_priv_len != NULL
&& (!OSSL_PARAM_get_long(param_priv_len, &priv_len)
|| !DH_set_length(dh, priv_len)))
return 0;
return 1;
}
int dh_key_fromdata(DH *dh, const OSSL_PARAM params[])
{
const OSSL_PARAM *param_priv_key, *param_pub_key;
BIGNUM *priv_key = NULL, *pub_key = NULL;
if (dh == NULL)
return 0;
param_priv_key = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_PRIV_KEY);
param_pub_key = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_PUB_KEY);
/*
* DH documentation says that a public key must be present if a
* private key is present.
* We want to have at least a public key either way, so we end up
* requiring it unconditionally.
*/
if (param_priv_key != NULL && param_pub_key == NULL)
return 0;
if ((param_priv_key != NULL
&& !OSSL_PARAM_get_BN(param_priv_key, &priv_key))
|| (param_pub_key != NULL
&& !OSSL_PARAM_get_BN(param_pub_key, &pub_key)))
goto err;
if (!DH_set0_key(dh, pub_key, priv_key))
goto err;
return 1;
err:
BN_clear_free(priv_key);
BN_free(pub_key);
return 0;
}
int dh_params_todata(DH *dh, OSSL_PARAM_BLD *bld, OSSL_PARAM params[])
{
long l = DH_get_length(dh);
if (!ossl_ffc_params_todata(dh_get0_params(dh), bld, params))
return 0;
if (l > 0
&& !ossl_param_build_set_long(bld, params, OSSL_PKEY_PARAM_DH_PRIV_LEN, l))
return 0;
return 1;
}
int dh_key_todata(DH *dh, OSSL_PARAM_BLD *bld, OSSL_PARAM params[])
{
const BIGNUM *priv = NULL, *pub = NULL;
if (dh == NULL)
return 0;
DH_get0_key(dh, &pub, &priv);
if (priv != NULL
&& !ossl_param_build_set_bn(bld, params, OSSL_PKEY_PARAM_PRIV_KEY, priv))
return 0;
if (pub != NULL
&& !ossl_param_build_set_bn(bld, params, OSSL_PKEY_PARAM_PUB_KEY, pub))
return 0;
return 1;
}
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