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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 2010-2020. 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 "evp.h"
ERL_NIF_TERM evp_compute_key_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
/* (Curve, PeerBin, MyBin) */
{
#ifdef HAVE_EDDH
ERL_NIF_TERM ret;
int type;
EVP_PKEY_CTX *ctx = NULL;
ErlNifBinary peer_bin, my_bin, key_bin;
EVP_PKEY *peer_key = NULL, *my_key = NULL;
size_t max_size;
int key_bin_alloc = 0;
ASSERT(argc == 3);
if (argv[0] == atom_x25519)
type = EVP_PKEY_X25519;
else if (argv[0] == atom_x448)
type = EVP_PKEY_X448;
else
goto bad_arg;
if (!enif_inspect_binary(env, argv[1], &peer_bin))
goto bad_arg;
if (!enif_inspect_binary(env, argv[2], &my_bin))
goto bad_arg;
if ((my_key = EVP_PKEY_new_raw_private_key(type, NULL, my_bin.data, my_bin.size)) == NULL)
goto err;
if ((ctx = EVP_PKEY_CTX_new(my_key, NULL)) == NULL)
goto err;
if (EVP_PKEY_derive_init(ctx) != 1)
goto err;
if ((peer_key = EVP_PKEY_new_raw_public_key(type, NULL, peer_bin.data, peer_bin.size)) == NULL)
goto err;
if (EVP_PKEY_derive_set_peer(ctx, peer_key) != 1)
goto err;
if (EVP_PKEY_derive(ctx, NULL, &max_size) != 1)
goto err;
if (!enif_alloc_binary(max_size, &key_bin))
goto err;
key_bin_alloc = 1;
if (EVP_PKEY_derive(ctx, key_bin.data, &key_bin.size) != 1)
goto err;
if (key_bin.size < max_size) {
if (!enif_realloc_binary(&key_bin, (size_t)key_bin.size))
goto err;
}
ret = enif_make_binary(env, &key_bin);
key_bin_alloc = 0;
goto done;
bad_arg:
err:
if (key_bin_alloc)
enif_release_binary(&key_bin);
ret = enif_make_badarg(env);
done:
if (my_key)
EVP_PKEY_free(my_key);
if (peer_key)
EVP_PKEY_free(peer_key);
if (ctx)
EVP_PKEY_CTX_free(ctx);
return ret;
#else
return atom_notsup;
#endif
}
ERL_NIF_TERM evp_generate_key_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
/* (Curve) */
{
#ifdef HAVE_EDDH
int type;
EVP_PKEY_CTX *ctx = NULL;
EVP_PKEY *pkey = NULL;
ERL_NIF_TERM ret_pub, ret_prv, ret;
ErlNifBinary prv_key;
size_t key_len;
unsigned char *out_pub = NULL, *out_priv = NULL;
if (argv[0] == atom_x25519)
type = EVP_PKEY_X25519;
else if (argv[0] == atom_x448)
type = EVP_PKEY_X448;
else if (argv[0] == atom_ed25519)
type = EVP_PKEY_ED25519;
else if (argv[0] == atom_ed448)
type = EVP_PKEY_ED448;
else
goto bad_arg;
if (argv[1] == atom_undefined) {
if ((ctx = EVP_PKEY_CTX_new_id(type, NULL)) == NULL)
goto bad_arg;
if (EVP_PKEY_keygen_init(ctx) != 1)
goto err;
if (EVP_PKEY_keygen(ctx, &pkey) != 1)
goto err;
} else {
if (!enif_inspect_binary(env, argv[1], &prv_key))
goto bad_arg;
if ((pkey = EVP_PKEY_new_raw_private_key(type, NULL, prv_key.data, prv_key.size)) == NULL)
goto bad_arg;
}
if (EVP_PKEY_get_raw_public_key(pkey, NULL, &key_len) != 1)
goto err;
if ((out_pub = enif_make_new_binary(env, key_len, &ret_pub)) == NULL)
goto err;
if (EVP_PKEY_get_raw_public_key(pkey, out_pub, &key_len) != 1)
goto err;
if (EVP_PKEY_get_raw_private_key(pkey, NULL, &key_len) != 1)
goto err;
if ((out_priv = enif_make_new_binary(env, key_len, &ret_prv)) == NULL)
goto err;
if (EVP_PKEY_get_raw_private_key(pkey, out_priv, &key_len) != 1)
goto err;
ret = enif_make_tuple2(env, ret_pub, ret_prv);
goto done;
bad_arg:
ret = enif_make_badarg(env);
goto done;
err:
ret = atom_error;
done:
if (pkey)
EVP_PKEY_free(pkey);
if (ctx)
EVP_PKEY_CTX_free(ctx);
return ret;
#else
return atom_notsup;
#endif
}
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