From 1f45e29e6fbd81f6c844b550a96b6d687b521fef Mon Sep 17 00:00:00 2001 From: Doug Hogan Date: Thu, 20 Dec 2018 02:07:26 -0800 Subject: Move DSS functionality to a new file --- lib/crypto/c_src/dss.c | 65 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 65 insertions(+) create mode 100644 lib/crypto/c_src/dss.c (limited to 'lib/crypto/c_src/dss.c') diff --git a/lib/crypto/c_src/dss.c b/lib/crypto/c_src/dss.c new file mode 100644 index 0000000000..b05304edb9 --- /dev/null +++ b/lib/crypto/c_src/dss.c @@ -0,0 +1,65 @@ +#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; +} -- cgit v1.2.3