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/*
* Copyright 2019 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
*/
#include <openssl/core_numbers.h>
#include <openssl/core_names.h>
#include <openssl/bn.h>
#include <openssl/dsa.h>
#include <openssl/params.h>
#include "internal/provider_algs.h"
static OSSL_OP_keymgmt_importkey_fn dsa_importkey;
static int params_to_key(DSA *dsa, const OSSL_PARAM params[])
{
const OSSL_PARAM *param_p, *param_q, *param_g, *param_priv_key;
const OSSL_PARAM *param_pub_key;
BIGNUM *p = NULL, *q = NULL, *g = NULL, *priv_key = NULL, *pub_key = NULL;
if (dsa == NULL)
return 0;
param_p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_P);
param_q = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_Q);
param_g = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_G);
param_priv_key =
OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_DSA_PRIV_KEY);
param_pub_key =
OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_DSA_PUB_KEY);
/*
* DSA documentation says that a public key must be present if a private key
* is.
*/
if (param_priv_key != NULL && param_pub_key == NULL)
return 0;
if ((param_p != NULL && !OSSL_PARAM_get_BN(param_p, &p))
|| (param_q != NULL && !OSSL_PARAM_get_BN(param_q, &q))
|| (param_g != NULL && !OSSL_PARAM_get_BN(param_g, &g))
|| (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 (!DSA_set0_pqg(dsa, p, q, g))
goto err;
p = q = g = NULL;
if (pub_key != NULL && !DSA_set0_key(dsa, pub_key, priv_key))
goto err;
priv_key = pub_key = NULL;
return 1;
err:
BN_free(p);
BN_free(q);
BN_free(g);
BN_free(priv_key);
BN_free(pub_key);
return 0;
}
static void *dsa_importkey(void *provctx, const OSSL_PARAM params[])
{
DSA *dsa;
if ((dsa = DSA_new()) == NULL
|| !params_to_key(dsa, params)) {
DSA_free(dsa);
dsa = NULL;
}
return dsa;
}
const OSSL_DISPATCH dsa_keymgmt_functions[] = {
/*
* TODO(3.0) When implementing OSSL_FUNC_KEYMGMT_GENKEY, remember to also
* implement OSSL_FUNC_KEYMGMT_EXPORTKEY.
*/
{ OSSL_FUNC_KEYMGMT_IMPORTKEY, (void (*)(void))dsa_importkey },
{ OSSL_FUNC_KEYMGMT_FREEKEY, (void (*)(void))DSA_free },
{ 0, NULL }
};
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