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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 2010-2018. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* %CopyrightEnd%
*/
#include "dss.h"
#include "bn.h"
int get_dss_private_key(ErlNifEnv* env, ERL_NIF_TERM key, DSA *dsa)
{
/* key=[P,Q,G,KEY] */
ERL_NIF_TERM head, tail;
BIGNUM *dsa_p = NULL, *dsa_q = NULL, *dsa_g = NULL;
BIGNUM *dummy_pub_key = NULL, *priv_key = NULL;
if (!enif_get_list_cell(env, key, &head, &tail))
goto err;
if (!get_bn_from_bin(env, head, &dsa_p))
goto err;
if (!enif_get_list_cell(env, tail, &head, &tail))
goto err;
if (!get_bn_from_bin(env, head, &dsa_q))
goto err;
if (!enif_get_list_cell(env, tail, &head, &tail))
goto err;
if (!get_bn_from_bin(env, head, &dsa_g))
goto err;
if (!enif_get_list_cell(env, tail, &head, &tail))
goto err;
if (!get_bn_from_bin(env, head, &priv_key))
goto err;
if (!enif_is_empty_list(env, tail))
goto err;
/* Note: DSA_set0_key() does not allow setting only the
* private key, although DSA_sign() does not use the
* public key. Work around this limitation by setting
* the public key to a copy of the private key.
*/
if ((dummy_pub_key = BN_dup(priv_key)) == NULL)
goto err;
if (!DSA_set0_pqg(dsa, dsa_p, dsa_q, dsa_g))
goto err;
/* dsa takes ownership on success */
dsa_p = NULL;
dsa_q = NULL;
dsa_g = NULL;
if (!DSA_set0_key(dsa, dummy_pub_key, priv_key))
goto err;
/* dsa takes ownership on success */
dummy_pub_key = NULL;
priv_key = NULL;
return 1;
err:
if (dsa_p)
BN_free(dsa_p);
if (dsa_q)
BN_free(dsa_q);
if (dsa_g)
BN_free(dsa_g);
if (priv_key)
BN_free(priv_key);
if (dummy_pub_key)
BN_free(dummy_pub_key);
return 0;
}
int get_dss_public_key(ErlNifEnv* env, ERL_NIF_TERM key, DSA *dsa)
{
/* key=[P, Q, G, Y] */
ERL_NIF_TERM head, tail;
BIGNUM *dsa_p = NULL, *dsa_q = NULL, *dsa_g = NULL, *dsa_y = NULL;
if (!enif_get_list_cell(env, key, &head, &tail))
goto err;
if (!get_bn_from_bin(env, head, &dsa_p))
goto err;
if (!enif_get_list_cell(env, tail, &head, &tail))
goto err;
if (!get_bn_from_bin(env, head, &dsa_q))
goto err;
if (!enif_get_list_cell(env, tail, &head, &tail))
goto err;
if (!get_bn_from_bin(env, head, &dsa_g))
goto err;
if (!enif_get_list_cell(env, tail, &head, &tail))
goto err;
if (!get_bn_from_bin(env, head, &dsa_y))
goto err;
if (!enif_is_empty_list(env,tail))
goto err;
if (!DSA_set0_pqg(dsa, dsa_p, dsa_q, dsa_g))
goto err;
/* dsa takes ownership on success */
dsa_p = NULL;
dsa_q = NULL;
dsa_g = NULL;
if (!DSA_set0_key(dsa, dsa_y, NULL))
goto err;
/* dsa takes ownership on success */
dsa_y = NULL;
return 1;
err:
if (dsa_p)
BN_free(dsa_p);
if (dsa_q)
BN_free(dsa_q);
if (dsa_g)
BN_free(dsa_g);
if (dsa_y)
BN_free(dsa_y);
return 0;
}
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