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#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, *priv_key = NULL;
if (!enif_get_list_cell(env, key, &head, &tail)
|| !get_bn_from_bin(env, head, &dsa_p)
|| !enif_get_list_cell(env, tail, &head, &tail)
|| !get_bn_from_bin(env, head, &dsa_q)
|| !enif_get_list_cell(env, tail, &head, &tail)
|| !get_bn_from_bin(env, head, &dsa_g)
|| !enif_get_list_cell(env, tail, &head, &tail)
|| !get_bn_from_bin(env, head, &priv_key)
|| !enif_is_empty_list(env,tail)) {
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);
return 0;
}
/* 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.
*/
dummy_pub_key = BN_dup(priv_key);
DSA_set0_pqg(dsa, dsa_p, dsa_q, dsa_g);
DSA_set0_key(dsa, dummy_pub_key, priv_key);
return 1;
}
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)
|| !get_bn_from_bin(env, head, &dsa_p)
|| !enif_get_list_cell(env, tail, &head, &tail)
|| !get_bn_from_bin(env, head, &dsa_q)
|| !enif_get_list_cell(env, tail, &head, &tail)
|| !get_bn_from_bin(env, head, &dsa_g)
|| !enif_get_list_cell(env, tail, &head, &tail)
|| !get_bn_from_bin(env, head, &dsa_y)
|| !enif_is_empty_list(env,tail)) {
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;
}
DSA_set0_pqg(dsa, dsa_p, dsa_q, dsa_g);
DSA_set0_key(dsa, dsa_y, NULL);
return 1;
}
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