diff options
Diffstat (limited to 'lib/crypto/c_src/dss.c')
-rw-r--r-- | lib/crypto/c_src/dss.c | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/lib/crypto/c_src/dss.c b/lib/crypto/c_src/dss.c new file mode 100644 index 0000000000..9d39241382 --- /dev/null +++ b/lib/crypto/c_src/dss.c @@ -0,0 +1,85 @@ +/* + * %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, *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; +} |